set SvUTF8 on vectors only if there are chars > 127; update copyright

[perl5.git] / perl.c

/*    perl.c
 *
 *    Copyright (c) 1987-2000 Larry Wall
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 *
 */

/*
 * "A ship then new they built for him/of mithril and of elven glass" --Bilbo
 */

#include "EXTERN.h"
#define PERL_IN_PERL_C
#include "perl.h"
#include "patchlevel.h"			/* for local_patches */

/* XXX If this causes problems, set i_unistd=undef in the hint file.  */
#ifdef I_UNISTD
#include <unistd.h>
#endif

#if !defined(STANDARD_C) && !defined(HAS_GETENV_PROTOTYPE)
char *getenv (char *); /* Usually in <stdlib.h> */
#endif

static I32 read_e_script(pTHXo_ int idx, SV *buf_sv, int maxlen);

#ifdef I_FCNTL
#include <fcntl.h>
#endif
#ifdef I_SYS_FILE
#include <sys/file.h>
#endif

#ifdef IAMSUID
#ifndef DOSUID
#define DOSUID
#endif
#endif

#ifdef SETUID_SCRIPTS_ARE_SECURE_NOW
#ifdef DOSUID
#undef DOSUID
#endif
#endif

#ifdef PERL_OBJECT
#define perl_construct	Perl_construct
#define perl_parse	Perl_parse
#define perl_run	Perl_run
#define perl_destruct	Perl_destruct
#define perl_free	Perl_free
#endif

#ifdef PERL_IMPLICIT_SYS
PerlInterpreter *
perl_alloc_using(struct IPerlMem* ipM, struct IPerlMem* ipMS,
		 struct IPerlMem* ipMP, struct IPerlEnv* ipE,
		 struct IPerlStdIO* ipStd, struct IPerlLIO* ipLIO,
		 struct IPerlDir* ipD, struct IPerlSock* ipS,
		 struct IPerlProc* ipP)
{
    PerlInterpreter *my_perl;
#ifdef PERL_OBJECT
    my_perl = (PerlInterpreter*)new(ipM) CPerlObj(ipM, ipMS, ipMP, ipE, ipStd,
						  ipLIO, ipD, ipS, ipP);
    PERL_SET_INTERP(my_perl);
#else
    /* New() needs interpreter, so call malloc() instead */
    my_perl = (PerlInterpreter*)(*ipM->pMalloc)(ipM, sizeof(PerlInterpreter));
    PERL_SET_INTERP(my_perl);
    Zero(my_perl, 1, PerlInterpreter);
    PL_Mem = ipM;
    PL_MemShared = ipMS;
    PL_MemParse = ipMP;
    PL_Env = ipE;
    PL_StdIO = ipStd;
    PL_LIO = ipLIO;
    PL_Dir = ipD;
    PL_Sock = ipS;
    PL_Proc = ipP;
#endif

    return my_perl;
}
#else

/*
=for apidoc perl_alloc

Allocates a new Perl interpreter.  See L<perlembed>.

=cut
*/

PerlInterpreter *
perl_alloc(void)
{
    PerlInterpreter *my_perl;

    /* New() needs interpreter, so call malloc() instead */
    my_perl = (PerlInterpreter*)PerlMem_malloc(sizeof(PerlInterpreter));
    PERL_SET_INTERP(my_perl);
    Zero(my_perl, 1, PerlInterpreter);
    return my_perl;
}
#endif /* PERL_IMPLICIT_SYS */

/*
=for apidoc perl_construct

Initializes a new Perl interpreter.  See L<perlembed>.

=cut
*/

void
perl_construct(pTHXx)
{
#ifdef USE_THREADS
    int i;
#ifndef FAKE_THREADS
    struct perl_thread *thr = NULL;
#endif /* FAKE_THREADS */
#endif /* USE_THREADS */
    
#ifdef MULTIPLICITY
    init_interp();
    PL_perl_destruct_level = 1; 
#else
   if (PL_perl_destruct_level > 0)
       init_interp();
#endif

   /* Init the real globals (and main thread)? */
    if (!PL_linestr) {
    	INIT_THREADS;
#ifdef USE_THREADS
#ifdef ALLOC_THREAD_KEY
        ALLOC_THREAD_KEY;
#else
	if (pthread_key_create(&PL_thr_key, 0))
	    Perl_croak(aTHX_ "panic: pthread_key_create");
#endif
	MUTEX_INIT(&PL_sv_mutex);
	/*
	 * Safe to use basic SV functions from now on (though
	 * not things like mortals or tainting yet).
	 */
	MUTEX_INIT(&PL_eval_mutex);
	COND_INIT(&PL_eval_cond);
	MUTEX_INIT(&PL_threads_mutex);
	COND_INIT(&PL_nthreads_cond);
#ifdef EMULATE_ATOMIC_REFCOUNTS
	MUTEX_INIT(&PL_svref_mutex);
#endif /* EMULATE_ATOMIC_REFCOUNTS */
	
	MUTEX_INIT(&PL_cred_mutex);

	thr = init_main_thread();
#endif /* USE_THREADS */

	PL_protect = MEMBER_TO_FPTR(Perl_default_protect); /* for exceptions */

	PL_curcop = &PL_compiling;	/* needed by ckWARN, right away */

	PL_linestr = NEWSV(65,79);
	sv_upgrade(PL_linestr,SVt_PVIV);

	if (!SvREADONLY(&PL_sv_undef)) {
	    /* set read-only and try to insure than we wont see REFCNT==0
	       very often */

	    SvREADONLY_on(&PL_sv_undef);
	    SvREFCNT(&PL_sv_undef) = (~(U32)0)/2;

	    sv_setpv(&PL_sv_no,PL_No);
	    SvNV(&PL_sv_no);
	    SvREADONLY_on(&PL_sv_no);
	    SvREFCNT(&PL_sv_no) = (~(U32)0)/2;

	    sv_setpv(&PL_sv_yes,PL_Yes);
	    SvNV(&PL_sv_yes);
	    SvREADONLY_on(&PL_sv_yes);
	    SvREFCNT(&PL_sv_yes) = (~(U32)0)/2;
	}

#ifdef PERL_OBJECT
	/* TODO: */
	/* PL_sighandlerp = sighandler; */
#else
	PL_sighandlerp = Perl_sighandler;
#endif
	PL_pidstatus = newHV();

#ifdef MSDOS
	/*
	 * There is no way we can refer to them from Perl so close them to save
	 * space.  The other alternative would be to provide STDAUX and STDPRN
	 * filehandles.
	 */
	(void)fclose(stdaux);
	(void)fclose(stdprn);
#endif
    }

    PL_nrs = newSVpvn("\n", 1);
    PL_rs = SvREFCNT_inc(PL_nrs);

    init_stacks();

    init_ids();
    PL_lex_state = LEX_NOTPARSING;

    JMPENV_BOOTSTRAP;
    STATUS_ALL_SUCCESS;

    init_i18nl10n(1);
    SET_NUMERIC_STANDARD();

    {
	U8 *s;
	PL_patchlevel = NEWSV(0,4);
	SvUPGRADE(PL_patchlevel, SVt_PVNV);
	if (PERL_REVISION > 127 || PERL_VERSION > 127 || PERL_SUBVERSION > 127)
	    SvGROW(PL_patchlevel,24);
	s = (U8*)SvPVX(PL_patchlevel);
	s = uv_to_utf8(s, (UV)PERL_REVISION);
	s = uv_to_utf8(s, (UV)PERL_VERSION);
	s = uv_to_utf8(s, (UV)PERL_SUBVERSION);
	*s = '\0';
	SvCUR_set(PL_patchlevel, s - (U8*)SvPVX(PL_patchlevel));
	SvPOK_on(PL_patchlevel);
	SvNVX(PL_patchlevel) = (NV)PERL_REVISION
				+ ((NV)PERL_VERSION / (NV)1000)
#if defined(PERL_SUBVERSION) && PERL_SUBVERSION > 0
				+ ((NV)PERL_SUBVERSION / (NV)1000000)
#endif
				;
	SvNOK_on(PL_patchlevel);	/* dual valued */
	SvUTF8_on(PL_patchlevel);
	SvREADONLY_on(PL_patchlevel);
    }

#if defined(LOCAL_PATCH_COUNT)
    PL_localpatches = local_patches;	/* For possible -v */
#endif

    PerlIO_init();			/* Hook to IO system */

    PL_fdpid = newAV();			/* for remembering popen pids by fd */
    PL_modglobal = newHV();		/* pointers to per-interpreter module globals */

    ENTER;
}

/*
=for apidoc perl_destruct

Shuts down a Perl interpreter.  See L<perlembed>.

=cut
*/

void
perl_destruct(pTHXx)
{
    dTHR;
    int destruct_level;  /* 0=none, 1=full, 2=full with checks */
    I32 last_sv_count;
    HV *hv;
#ifdef USE_THREADS
    Thread t;
    dTHX;
#endif /* USE_THREADS */

    /* wait for all pseudo-forked children to finish */
    PERL_WAIT_FOR_CHILDREN;

#ifdef USE_THREADS
#ifndef FAKE_THREADS
    /* Pass 1 on any remaining threads: detach joinables, join zombies */
  retry_cleanup:
    MUTEX_LOCK(&PL_threads_mutex);
    DEBUG_S(PerlIO_printf(Perl_debug_log,
			  "perl_destruct: waiting for %d threads...\n",
			  PL_nthreads - 1));
    for (t = thr->next; t != thr; t = t->next) {
	MUTEX_LOCK(&t->mutex);
	switch (ThrSTATE(t)) {
	    AV *av;
	case THRf_ZOMBIE:
	    DEBUG_S(PerlIO_printf(Perl_debug_log,
				  "perl_destruct: joining zombie %p\n", t));
	    ThrSETSTATE(t, THRf_DEAD);
	    MUTEX_UNLOCK(&t->mutex);
	    PL_nthreads--;
	    /*
	     * The SvREFCNT_dec below may take a long time (e.g. av
	     * may contain an object scalar whose destructor gets
	     * called) so we have to unlock threads_mutex and start
	     * all over again.
	     */
	    MUTEX_UNLOCK(&PL_threads_mutex);
	    JOIN(t, &av);
	    SvREFCNT_dec((SV*)av);
	    DEBUG_S(PerlIO_printf(Perl_debug_log,
				  "perl_destruct: joined zombie %p OK\n", t));
	    goto retry_cleanup;
	case THRf_R_JOINABLE:
	    DEBUG_S(PerlIO_printf(Perl_debug_log,
				  "perl_destruct: detaching thread %p\n", t));
	    ThrSETSTATE(t, THRf_R_DETACHED);
	    /* 
	     * We unlock threads_mutex and t->mutex in the opposite order
	     * from which we locked them just so that DETACH won't
	     * deadlock if it panics. It's only a breach of good style
	     * not a bug since they are unlocks not locks.
	     */
	    MUTEX_UNLOCK(&PL_threads_mutex);
	    DETACH(t);
	    MUTEX_UNLOCK(&t->mutex);
	    goto retry_cleanup;
	default:
	    DEBUG_S(PerlIO_printf(Perl_debug_log,
				  "perl_destruct: ignoring %p (state %u)\n",
				  t, ThrSTATE(t)));
	    MUTEX_UNLOCK(&t->mutex);
	    /* fall through and out */
	}
    }
    /* We leave the above "Pass 1" loop with threads_mutex still locked */

    /* Pass 2 on remaining threads: wait for the thread count to drop to one */
    while (PL_nthreads > 1)
    {
	DEBUG_S(PerlIO_printf(Perl_debug_log,
			      "perl_destruct: final wait for %d threads\n",
			      PL_nthreads - 1));
	COND_WAIT(&PL_nthreads_cond, &PL_threads_mutex);
    }
    /* At this point, we're the last thread */
    MUTEX_UNLOCK(&PL_threads_mutex);
    DEBUG_S(PerlIO_printf(Perl_debug_log, "perl_destruct: armageddon has arrived\n"));
    MUTEX_DESTROY(&PL_threads_mutex);
    COND_DESTROY(&PL_nthreads_cond);
#endif /* !defined(FAKE_THREADS) */
#endif /* USE_THREADS */

    destruct_level = PL_perl_destruct_level;
#ifdef DEBUGGING
    {
	char *s;
	if (s = PerlEnv_getenv("PERL_DESTRUCT_LEVEL")) {
	    int i = atoi(s);
	    if (destruct_level < i)
		destruct_level = i;
	}
    }
#endif

    LEAVE;
    FREETMPS;

    /* We must account for everything.  */

    /* Destroy the main CV and syntax tree */
    if (PL_main_root) {
	PL_curpad = AvARRAY(PL_comppad);
	op_free(PL_main_root);
	PL_main_root = Nullop;
    }
    PL_curcop = &PL_compiling;
    PL_main_start = Nullop;
    SvREFCNT_dec(PL_main_cv);
    PL_main_cv = Nullcv;
    PL_dirty = TRUE;

    if (PL_sv_objcount) {
	/*
	 * Try to destruct global references.  We do this first so that the
	 * destructors and destructees still exist.  Some sv's might remain.
	 * Non-referenced objects are on their own.
	 */
	sv_clean_objs();
    }

    /* unhook hooks which will soon be, or use, destroyed data */
    SvREFCNT_dec(PL_warnhook);
    PL_warnhook = Nullsv;
    SvREFCNT_dec(PL_diehook);
    PL_diehook = Nullsv;

    /* call exit list functions */
    while (PL_exitlistlen-- > 0)
	PL_exitlist[PL_exitlistlen].fn(aTHXo_ PL_exitlist[PL_exitlistlen].ptr);

    Safefree(PL_exitlist);

    if (destruct_level == 0){

	DEBUG_P(debprofdump());
    
	/* The exit() function will do everything that needs doing. */
	return;
    }

    /* loosen bonds of global variables */

    if(PL_rsfp) {
	(void)PerlIO_close(PL_rsfp);
	PL_rsfp = Nullfp;
    }

    /* Filters for program text */
    SvREFCNT_dec(PL_rsfp_filters);
    PL_rsfp_filters = Nullav;

    /* switches */
    PL_preprocess   = FALSE;
    PL_minus_n      = FALSE;
    PL_minus_p      = FALSE;
    PL_minus_l      = FALSE;
    PL_minus_a      = FALSE;
    PL_minus_F      = FALSE;
    PL_doswitches   = FALSE;
    PL_dowarn       = G_WARN_OFF;
    PL_doextract    = FALSE;
    PL_sawampersand = FALSE;	/* must save all match strings */
    PL_unsafe       = FALSE;

    Safefree(PL_inplace);
    PL_inplace = Nullch;
    SvREFCNT_dec(PL_patchlevel);

    if (PL_e_script) {
	SvREFCNT_dec(PL_e_script);
	PL_e_script = Nullsv;
    }

    /* magical thingies */

    Safefree(PL_ofs);	/* $, */
    PL_ofs = Nullch;

    Safefree(PL_ors);	/* $\ */
    PL_ors = Nullch;

    SvREFCNT_dec(PL_rs);	/* $/ */
    PL_rs = Nullsv;

    SvREFCNT_dec(PL_nrs);	/* $/ helper */
    PL_nrs = Nullsv;

    PL_multiline = 0;	/* $* */

    SvREFCNT_dec(PL_statname);
    PL_statname = Nullsv;
    PL_statgv = Nullgv;

    /* defgv, aka *_ should be taken care of elsewhere */

    /* clean up after study() */
    SvREFCNT_dec(PL_lastscream);
    PL_lastscream = Nullsv;
    Safefree(PL_screamfirst);
    PL_screamfirst = 0;
    Safefree(PL_screamnext);
    PL_screamnext  = 0;

    /* float buffer */
    Safefree(PL_efloatbuf);
    PL_efloatbuf = Nullch;
    PL_efloatsize = 0;

    /* startup and shutdown function lists */
    SvREFCNT_dec(PL_beginav);
    SvREFCNT_dec(PL_endav);
    SvREFCNT_dec(PL_checkav);
    SvREFCNT_dec(PL_initav);
    PL_beginav = Nullav;
    PL_endav = Nullav;
    PL_checkav = Nullav;
    PL_initav = Nullav;

    /* shortcuts just get cleared */
    PL_envgv = Nullgv;
    PL_incgv = Nullgv;
    PL_hintgv = Nullgv;
    PL_errgv = Nullgv;
    PL_argvgv = Nullgv;
    PL_argvoutgv = Nullgv;
    PL_stdingv = Nullgv;
    PL_stderrgv = Nullgv;
    PL_last_in_gv = Nullgv;
    PL_replgv = Nullgv;
    PL_debstash = Nullhv;

    /* reset so print() ends up where we expect */
    setdefout(Nullgv);

    SvREFCNT_dec(PL_argvout_stack);
    PL_argvout_stack = Nullav;

    SvREFCNT_dec(PL_fdpid);
    PL_fdpid = Nullav;
    SvREFCNT_dec(PL_modglobal);
    PL_modglobal = Nullhv;
    SvREFCNT_dec(PL_preambleav);
    PL_preambleav = Nullav;
    SvREFCNT_dec(PL_subname);
    PL_subname = Nullsv;
    SvREFCNT_dec(PL_linestr);
    PL_linestr = Nullsv;
    SvREFCNT_dec(PL_pidstatus);
    PL_pidstatus = Nullhv;
    SvREFCNT_dec(PL_toptarget);
    PL_toptarget = Nullsv;
    SvREFCNT_dec(PL_bodytarget);
    PL_bodytarget = Nullsv;
    PL_formtarget = Nullsv;

    /* clear utf8 character classes */
    SvREFCNT_dec(PL_utf8_alnum);
    SvREFCNT_dec(PL_utf8_alnumc);
    SvREFCNT_dec(PL_utf8_ascii);
    SvREFCNT_dec(PL_utf8_alpha);
    SvREFCNT_dec(PL_utf8_space);
    SvREFCNT_dec(PL_utf8_cntrl);
    SvREFCNT_dec(PL_utf8_graph);
    SvREFCNT_dec(PL_utf8_digit);
    SvREFCNT_dec(PL_utf8_upper);
    SvREFCNT_dec(PL_utf8_lower);
    SvREFCNT_dec(PL_utf8_print);
    SvREFCNT_dec(PL_utf8_punct);
    SvREFCNT_dec(PL_utf8_xdigit);
    SvREFCNT_dec(PL_utf8_mark);
    SvREFCNT_dec(PL_utf8_toupper);
    SvREFCNT_dec(PL_utf8_tolower);
    PL_utf8_alnum	= Nullsv;
    PL_utf8_alnumc	= Nullsv;
    PL_utf8_ascii	= Nullsv;
    PL_utf8_alpha	= Nullsv;
    PL_utf8_space	= Nullsv;
    PL_utf8_cntrl	= Nullsv;
    PL_utf8_graph	= Nullsv;
    PL_utf8_digit	= Nullsv;
    PL_utf8_upper	= Nullsv;
    PL_utf8_lower	= Nullsv;
    PL_utf8_print	= Nullsv;
    PL_utf8_punct	= Nullsv;
    PL_utf8_xdigit	= Nullsv;
    PL_utf8_mark	= Nullsv;
    PL_utf8_toupper	= Nullsv;
    PL_utf8_totitle	= Nullsv;
    PL_utf8_tolower	= Nullsv;

    if (!specialWARN(PL_compiling.cop_warnings))
	SvREFCNT_dec(PL_compiling.cop_warnings);
    PL_compiling.cop_warnings = Nullsv;

    /* Prepare to destruct main symbol table.  */

    hv = PL_defstash;
    PL_defstash = 0;
    SvREFCNT_dec(hv);
    SvREFCNT_dec(PL_curstname);
    PL_curstname = Nullsv;

    /* clear queued errors */
    SvREFCNT_dec(PL_errors);
    PL_errors = Nullsv;

    FREETMPS;
    if (destruct_level >= 2 && ckWARN_d(WARN_INTERNAL)) {
	if (PL_scopestack_ix != 0)
	    Perl_warner(aTHX_ WARN_INTERNAL,
	         "Unbalanced scopes: %ld more ENTERs than LEAVEs\n",
		 (long)PL_scopestack_ix);
	if (PL_savestack_ix != 0)
	    Perl_warner(aTHX_ WARN_INTERNAL,
		 "Unbalanced saves: %ld more saves than restores\n",
		 (long)PL_savestack_ix);
	if (PL_tmps_floor != -1)
	    Perl_warner(aTHX_ WARN_INTERNAL,"Unbalanced tmps: %ld more allocs than frees\n",
		 (long)PL_tmps_floor + 1);
	if (cxstack_ix != -1)
	    Perl_warner(aTHX_ WARN_INTERNAL,"Unbalanced context: %ld more PUSHes than POPs\n",
		 (long)cxstack_ix + 1);
    }

    /* Now absolutely destruct everything, somehow or other, loops or no. */
    last_sv_count = 0;
    SvFLAGS(PL_strtab) |= SVTYPEMASK;		/* don't clean out strtab now */
    while (PL_sv_count != 0 && PL_sv_count != last_sv_count) {
	last_sv_count = PL_sv_count;
	sv_clean_all();
    }
    SvFLAGS(PL_strtab) &= ~SVTYPEMASK;
    SvFLAGS(PL_strtab) |= SVt_PVHV;
    
    /* Destruct the global string table. */
    {
	/* Yell and reset the HeVAL() slots that are still holding refcounts,
	 * so that sv_free() won't fail on them.
	 */
	I32 riter;
	I32 max;
	HE *hent;
	HE **array;

	riter = 0;
	max = HvMAX(PL_strtab);
	array = HvARRAY(PL_strtab);
	hent = array[0];
	for (;;) {
	    if (hent && ckWARN_d(WARN_INTERNAL)) {
		Perl_warner(aTHX_ WARN_INTERNAL,
		     "Unbalanced string table refcount: (%d) for \"%s\"",
		     HeVAL(hent) - Nullsv, HeKEY(hent));
		HeVAL(hent) = Nullsv;
		hent = HeNEXT(hent);
	    }
	    if (!hent) {
		if (++riter > max)
		    break;
		hent = array[riter];
	    }
	}
    }
    SvREFCNT_dec(PL_strtab);

    if (PL_sv_count != 0 && ckWARN_d(WARN_INTERNAL))
	Perl_warner(aTHX_ WARN_INTERNAL,"Scalars leaked: %ld\n", (long)PL_sv_count);

    sv_free_arenas();

    /* No SVs have survived, need to clean out */
    Safefree(PL_origfilename);
    Safefree(PL_reg_start_tmp);
    if (PL_reg_curpm)
	Safefree(PL_reg_curpm);
    Safefree(PL_reg_poscache);
    Safefree(HeKEY_hek(&PL_hv_fetch_ent_mh));
    Safefree(PL_op_mask);
    nuke_stacks();
    PL_hints = 0;		/* Reset hints. Should hints be per-interpreter ? */
    
    DEBUG_P(debprofdump());
#ifdef USE_THREADS
    MUTEX_DESTROY(&PL_strtab_mutex);
    MUTEX_DESTROY(&PL_sv_mutex);
    MUTEX_DESTROY(&PL_eval_mutex);
    MUTEX_DESTROY(&PL_cred_mutex);
    COND_DESTROY(&PL_eval_cond);
#ifdef EMULATE_ATOMIC_REFCOUNTS
    MUTEX_DESTROY(&PL_svref_mutex);
#endif /* EMULATE_ATOMIC_REFCOUNTS */

    /* As the penultimate thing, free the non-arena SV for thrsv */
    Safefree(SvPVX(PL_thrsv));
    Safefree(SvANY(PL_thrsv));
    Safefree(PL_thrsv);
    PL_thrsv = Nullsv;
#endif /* USE_THREADS */
    
    /* As the absolutely last thing, free the non-arena SV for mess() */

    if (PL_mess_sv) {
	/* it could have accumulated taint magic */
	if (SvTYPE(PL_mess_sv) >= SVt_PVMG) {
	    MAGIC* mg;
	    MAGIC* moremagic;
	    for (mg = SvMAGIC(PL_mess_sv); mg; mg = moremagic) {
		moremagic = mg->mg_moremagic;
		if (mg->mg_ptr && mg->mg_type != 'g' && mg->mg_len >= 0)
		    Safefree(mg->mg_ptr);
		Safefree(mg);
	    }
	}
	/* we know that type >= SVt_PV */
	SvOOK_off(PL_mess_sv);
	Safefree(SvPVX(PL_mess_sv));
	Safefree(SvANY(PL_mess_sv));
	Safefree(PL_mess_sv);
	PL_mess_sv = Nullsv;
    }
}

/*
=for apidoc perl_free

Releases a Perl interpreter.  See L<perlembed>.

=cut
*/

void
perl_free(pTHXx)
{
#if defined(PERL_OBJECT)
    PerlMem_free(this);
#else
    PerlMem_free(aTHXx);
#endif
}

void
Perl_call_atexit(pTHX_ ATEXIT_t fn, void *ptr)
{
    Renew(PL_exitlist, PL_exitlistlen+1, PerlExitListEntry);
    PL_exitlist[PL_exitlistlen].fn = fn;
    PL_exitlist[PL_exitlistlen].ptr = ptr;
    ++PL_exitlistlen;
}

/*
=for apidoc perl_parse

Tells a Perl interpreter to parse a Perl script.  See L<perlembed>.

=cut
*/

int
perl_parse(pTHXx_ XSINIT_t xsinit, int argc, char **argv, char **env)
{
    dTHR;
    I32 oldscope;
    int ret;
    dJMPENV;
#ifdef USE_THREADS
    dTHX;
#endif

#ifdef SETUID_SCRIPTS_ARE_SECURE_NOW
#ifdef IAMSUID
#undef IAMSUID
    Perl_croak(aTHX_ "suidperl is no longer needed since the kernel can now execute\n\
setuid perl scripts securely.\n");
#endif
#endif

#if defined(__DYNAMIC__) && (defined(NeXT) || defined(__NeXT__))
    _dyld_lookup_and_bind
	("__environ", (unsigned long *) &environ_pointer, NULL);
#endif /* environ */

    PL_origargv = argv;
    PL_origargc = argc;
#ifndef VMS  /* VMS doesn't have environ array */
    PL_origenviron = environ;
#endif

    if (PL_do_undump) {

	/* Come here if running an undumped a.out. */

	PL_origfilename = savepv(argv[0]);
	PL_do_undump = FALSE;
	cxstack_ix = -1;		/* start label stack again */
	init_ids();
	init_postdump_symbols(argc,argv,env);
	return 0;
    }

    if (PL_main_root) {
	PL_curpad = AvARRAY(PL_comppad);
	op_free(PL_main_root);
	PL_main_root = Nullop;
    }
    PL_main_start = Nullop;
    SvREFCNT_dec(PL_main_cv);
    PL_main_cv = Nullcv;

    time(&PL_basetime);
    oldscope = PL_scopestack_ix;
    PL_dowarn = G_WARN_OFF;

    CALLPROTECT(aTHX_ pcur_env, &ret, MEMBER_TO_FPTR(S_parse_body),
		env, xsinit);
    switch (ret) {
    case 0:
	if (PL_checkav)
	    call_list(oldscope, PL_checkav);
	return 0;
    case 1:
	STATUS_ALL_FAILURE;
	/* FALL THROUGH */
    case 2:
	/* my_exit() was called */
	while (PL_scopestack_ix > oldscope)
	    LEAVE;
	FREETMPS;
	PL_curstash = PL_defstash;
	if (PL_checkav)
	    call_list(oldscope, PL_checkav);
	return STATUS_NATIVE_EXPORT;
    case 3:
	PerlIO_printf(Perl_error_log, "panic: top_env\n");
	return 1;
    }
    return 0;
}

STATIC void *
S_parse_body(pTHX_ va_list args)
{
    dTHR;
    int argc = PL_origargc;
    char **argv = PL_origargv;
    char **env = va_arg(args, char**);
    char *scriptname = NULL;
    int fdscript = -1;
    VOL bool dosearch = FALSE;
    char *validarg = "";
    AV* comppadlist;
    register SV *sv;
    register char *s;
    char *cddir = Nullch;

    XSINIT_t xsinit = va_arg(args, XSINIT_t);

    sv_setpvn(PL_linestr,"",0);
    sv = newSVpvn("",0);		/* first used for -I flags */
    SAVEFREESV(sv);
    init_main_stash();

    for (argc--,argv++; argc > 0; argc--,argv++) {
	if (argv[0][0] != '-' || !argv[0][1])
	    break;
#ifdef DOSUID
    if (*validarg)
	validarg = " PHOOEY ";
    else
	validarg = argv[0];
#endif
	s = argv[0]+1;
      reswitch:
	switch (*s) {
#ifndef PERL_STRICT_CR
	case '\r':
#endif
	case ' ':
	case '0':
	case 'F':
	case 'a':
	case 'c':
	case 'd':
	case 'D':
	case 'h':
	case 'i':
	case 'l':
	case 'M':
	case 'm':
	case 'n':
	case 'p':
	case 's':
	case 'u':
	case 'U':
	case 'v':
	case 'W':
	case 'X':
	case 'w':
	    if (s = moreswitches(s))
		goto reswitch;
	    break;

	case 'T':
	    PL_tainting = TRUE;
	    s++;
	    goto reswitch;

	case 'e':
	    if (PL_euid != PL_uid || PL_egid != PL_gid)
		Perl_croak(aTHX_ "No -e allowed in setuid scripts");
	    if (!PL_e_script) {
		PL_e_script = newSVpvn("",0);
		filter_add(read_e_script, NULL);
	    }
	    if (*++s)
		sv_catpv(PL_e_script, s);
	    else if (argv[1]) {
		sv_catpv(PL_e_script, argv[1]);
		argc--,argv++;
	    }
	    else
		Perl_croak(aTHX_ "No code specified for -e");
	    sv_catpv(PL_e_script, "\n");
	    break;

	case 'I':	/* -I handled both here and in moreswitches() */
	    forbid_setid("-I");
	    if (!*++s && (s=argv[1]) != Nullch) {
		argc--,argv++;
	    }
	    if (s && *s) {
		char *p;
		STRLEN len = strlen(s);
		p = savepvn(s, len);
		incpush(p, TRUE);
		sv_catpvn(sv, "-I", 2);
		sv_catpvn(sv, p, len);
		sv_catpvn(sv, " ", 1);
		Safefree(p);
	    }
	    else
		Perl_croak(aTHX_ "No directory specified for -I");
	    break;
	case 'P':
	    forbid_setid("-P");
	    PL_preprocess = TRUE;
	    s++;
	    goto reswitch;
	case 'S':
	    forbid_setid("-S");
	    dosearch = TRUE;
	    s++;
	    goto reswitch;
	case 'V':
	    if (!PL_preambleav)
		PL_preambleav = newAV();
	    av_push(PL_preambleav, newSVpv("use Config qw(myconfig config_vars)",0));
	    if (*++s != ':')  {
		PL_Sv = newSVpv("print myconfig();",0);
#ifdef VMS
		sv_catpv(PL_Sv,"print \"\\nCharacteristics of this PERLSHR image: \\n\",");
#else
		sv_catpv(PL_Sv,"print \"\\nCharacteristics of this binary (from libperl): \\n\",");
#endif
		sv_catpv(PL_Sv,"\"  Compile-time options:");
#  ifdef DEBUGGING
		sv_catpv(PL_Sv," DEBUGGING");
#  endif
#  ifdef MULTIPLICITY
		sv_catpv(PL_Sv," MULTIPLICITY");
#  endif
#  ifdef USE_THREADS
		sv_catpv(PL_Sv," USE_THREADS");
#  endif
#  ifdef USE_ITHREADS
		sv_catpv(PL_Sv," USE_ITHREADS");
#  endif
#  ifdef USE_64_BITS
		sv_catpv(PL_Sv," USE_64_BITS");
#  endif
#  ifdef USE_LONG_DOUBLE
		sv_catpv(PL_Sv," USE_LONG_DOUBLE");
#  endif
#  ifdef USE_LARGE_FILES
		sv_catpv(PL_Sv," USE_LARGE_FILES");
#  endif
#  ifdef USE_SOCKS
		sv_catpv(PL_Sv," USE_SOCKS");
#  endif
#  ifdef PERL_OBJECT
		sv_catpv(PL_Sv," PERL_OBJECT");
#  endif
#  ifdef PERL_IMPLICIT_CONTEXT
		sv_catpv(PL_Sv," PERL_IMPLICIT_CONTEXT");
#  endif
#  ifdef PERL_IMPLICIT_SYS
		sv_catpv(PL_Sv," PERL_IMPLICIT_SYS");
#  endif
		sv_catpv(PL_Sv,"\\n\",");

#if defined(LOCAL_PATCH_COUNT)
		if (LOCAL_PATCH_COUNT > 0) {
		    int i;
		    sv_catpv(PL_Sv,"\"  Locally applied patches:\\n\",");
		    for (i = 1; i <= LOCAL_PATCH_COUNT; i++) {
			if (PL_localpatches[i])
			    Perl_sv_catpvf(aTHX_ PL_Sv,"q\"  \t%s\n\",",PL_localpatches[i]);
		    }
		}
#endif
		Perl_sv_catpvf(aTHX_ PL_Sv,"\"  Built under %s\\n\"",OSNAME);
#ifdef __DATE__
#  ifdef __TIME__
		Perl_sv_catpvf(aTHX_ PL_Sv,",\"  Compiled at %s %s\\n\"",__DATE__,__TIME__);
#  else
		Perl_sv_catpvf(aTHX_ PL_Sv,",\"  Compiled on %s\\n\"",__DATE__);
#  endif
#endif
		sv_catpv(PL_Sv, "; \
$\"=\"\\n    \"; \
@env = map { \"$_=\\\"$ENV{$_}\\\"\" } sort grep {/^PERL/} keys %ENV; \
print \"  \\%ENV:\\n    @env\\n\" if @env; \
print \"  \\@INC:\\n    @INC\\n\";");
	    }
	    else {
		PL_Sv = newSVpv("config_vars(qw(",0);
		sv_catpv(PL_Sv, ++s);
		sv_catpv(PL_Sv, "))");
		s += strlen(s);
	    }
	    av_push(PL_preambleav, PL_Sv);
	    scriptname = BIT_BUCKET;	/* don't look for script or read stdin */
	    goto reswitch;
	case 'x':
	    PL_doextract = TRUE;
	    s++;
	    if (*s)
		cddir = s;
	    break;
	case 0:
	    break;
	case '-':
	    if (!*++s || isSPACE(*s)) {
		argc--,argv++;
		goto switch_end;
	    }
	    /* catch use of gnu style long options */
	    if (strEQ(s, "version")) {
		s = "v";
		goto reswitch;
	    }
	    if (strEQ(s, "help")) {
		s = "h";
		goto reswitch;
	    }
	    s--;
	    /* FALL THROUGH */
	default:
	    Perl_croak(aTHX_ "Unrecognized switch: -%s  (-h will show valid options)",s);
	}
    }
  switch_end:

    if (
#ifndef SECURE_INTERNAL_GETENV
        !PL_tainting &&
#endif
	(s = PerlEnv_getenv("PERL5OPT")))
    {
	while (isSPACE(*s))
	    s++;
	if (*s == '-' && *(s+1) == 'T')
	    PL_tainting = TRUE;
	else {
	    while (s && *s) {
		while (isSPACE(*s))
		    s++;
		if (*s == '-') {
		    s++;
		    if (isSPACE(*s))
			continue;
		}
		if (!*s)
		    break;
		if (!strchr("DIMUdmw", *s))
		    Perl_croak(aTHX_ "Illegal switch in PERL5OPT: -%c", *s);
		s = moreswitches(s);
	    }
	}
    }

    if (!scriptname)
	scriptname = argv[0];
    if (PL_e_script) {
	argc++,argv--;
	scriptname = BIT_BUCKET;	/* don't look for script or read stdin */
    }
    else if (scriptname == Nullch) {
#ifdef MSDOS
	if ( PerlLIO_isatty(PerlIO_fileno(PerlIO_stdin())) )
	    moreswitches("h");
#endif
	scriptname = "-";
    }

    init_perllib();

    open_script(scriptname,dosearch,sv,&fdscript);

    validate_suid(validarg, scriptname,fdscript);

#if defined(SIGCHLD) || defined(SIGCLD)
    {
#ifndef SIGCHLD
#  define SIGCHLD SIGCLD
#endif
	Sighandler_t sigstate = rsignal_state(SIGCHLD);
	if (sigstate == SIG_IGN) {
	    if (ckWARN(WARN_SIGNAL))
		Perl_warner(aTHX_ WARN_SIGNAL,
			    "Can't ignore signal CHLD, forcing to default");
	    (void)rsignal(SIGCHLD, (Sighandler_t)SIG_DFL);
	}
    }
#endif

    if (PL_doextract) {
	find_beginning();
	if (cddir && PerlDir_chdir(cddir) < 0)
	    Perl_croak(aTHX_ "Can't chdir to %s",cddir);

    }

    PL_main_cv = PL_compcv = (CV*)NEWSV(1104,0);
    sv_upgrade((SV *)PL_compcv, SVt_PVCV);
    CvUNIQUE_on(PL_compcv);

    PL_comppad = newAV();
    av_push(PL_comppad, Nullsv);
    PL_curpad = AvARRAY(PL_comppad);
    PL_comppad_name = newAV();
    PL_comppad_name_fill = 0;
    PL_min_intro_pending = 0;
    PL_padix = 0;
#ifdef USE_THREADS
    av_store(PL_comppad_name, 0, newSVpvn("@_", 2));
    PL_curpad[0] = (SV*)newAV();
    SvPADMY_on(PL_curpad[0]);	/* XXX Needed? */
    CvOWNER(PL_compcv) = 0;
    New(666, CvMUTEXP(PL_compcv), 1, perl_mutex);
    MUTEX_INIT(CvMUTEXP(PL_compcv));
#endif /* USE_THREADS */

    comppadlist = newAV();
    AvREAL_off(comppadlist);
    av_store(comppadlist, 0, (SV*)PL_comppad_name);
    av_store(comppadlist, 1, (SV*)PL_comppad);
    CvPADLIST(PL_compcv) = comppadlist;

    boot_core_UNIVERSAL();
    boot_core_xsutils();

    if (xsinit)
	(*xsinit)(aTHXo);	/* in case linked C routines want magical variables */
#if defined(VMS) || defined(WIN32) || defined(DJGPP)
    init_os_extras();
#endif

#ifdef USE_SOCKS
    SOCKSinit(argv[0]);
#endif    

    init_predump_symbols();
    /* init_postdump_symbols not currently designed to be called */
    /* more than once (ENV isn't cleared first, for example)	 */
    /* But running with -u leaves %ENV & @ARGV undefined!    XXX */
    if (!PL_do_undump)
	init_postdump_symbols(argc,argv,env);

    init_lexer();

    /* now parse the script */

    SETERRNO(0,SS$_NORMAL);
    PL_error_count = 0;
    if (yyparse() || PL_error_count) {
	if (PL_minus_c)
	    Perl_croak(aTHX_ "%s had compilation errors.\n", PL_origfilename);
	else {
	    Perl_croak(aTHX_ "Execution of %s aborted due to compilation errors.\n",
		       PL_origfilename);
	}
    }
    CopLINE_set(PL_curcop, 0);
    PL_curstash = PL_defstash;
    PL_preprocess = FALSE;
    if (PL_e_script) {
	SvREFCNT_dec(PL_e_script);
	PL_e_script = Nullsv;
    }

    /* now that script is parsed, we can modify record separator */
    SvREFCNT_dec(PL_rs);
    PL_rs = SvREFCNT_inc(PL_nrs);
    sv_setsv(get_sv("/", TRUE), PL_rs);
    if (PL_do_undump)
	my_unexec();

    if (isWARN_ONCE) {
	SAVECOPFILE(PL_curcop);
	SAVECOPLINE(PL_curcop);
	gv_check(PL_defstash);
    }

    LEAVE;
    FREETMPS;

#ifdef MYMALLOC
    if ((s=PerlEnv_getenv("PERL_DEBUG_MSTATS")) && atoi(s) >= 2)
	dump_mstats("after compilation:");
#endif

    ENTER;
    PL_restartop = 0;
    return NULL;
}

/*
=for apidoc perl_run

Tells a Perl interpreter to run.  See L<perlembed>.

=cut
*/

int
perl_run(pTHXx)
{
    dTHR;
    I32 oldscope;
    int ret;
    dJMPENV;
#ifdef USE_THREADS
    dTHX;
#endif

    oldscope = PL_scopestack_ix;

 redo_body:
    CALLPROTECT(aTHX_ pcur_env, &ret, MEMBER_TO_FPTR(S_run_body), oldscope);
    switch (ret) {
    case 1:
	cxstack_ix = -1;		/* start context stack again */
	goto redo_body;
    case 0:  /* normal completion */
    case 2:  /* my_exit() */
	while (PL_scopestack_ix > oldscope)
	    LEAVE;
	FREETMPS;
	PL_curstash = PL_defstash;
	if (PL_endav && !PL_minus_c)
	    call_list(oldscope, PL_endav);
#ifdef MYMALLOC
	if (PerlEnv_getenv("PERL_DEBUG_MSTATS"))
	    dump_mstats("after execution:  ");
#endif
	return STATUS_NATIVE_EXPORT;
    case 3:
	if (PL_restartop) {
	    POPSTACK_TO(PL_mainstack);
	    goto redo_body;
	}
	PerlIO_printf(Perl_error_log, "panic: restartop\n");
	FREETMPS;
	return 1;
    }

    /* NOTREACHED */
    return 0;
}

STATIC void *
S_run_body(pTHX_ va_list args)
{
    dTHR;
    I32 oldscope = va_arg(args, I32);

    DEBUG_r(PerlIO_printf(Perl_debug_log, "%s $` $& $' support.\n",
                    PL_sawampersand ? "Enabling" : "Omitting"));

    if (!PL_restartop) {
	DEBUG_x(dump_all());
	DEBUG(PerlIO_printf(Perl_debug_log, "\nEXECUTING...\n\n"));
	DEBUG_S(PerlIO_printf(Perl_debug_log, "main thread is 0x%"UVxf"\n",
			      PTR2UV(thr)));

	if (PL_minus_c) {
	    PerlIO_printf(Perl_error_log, "%s syntax OK\n", PL_origfilename);
	    my_exit(0);
	}
	if (PERLDB_SINGLE && PL_DBsingle)
	    sv_setiv(PL_DBsingle, 1); 
	if (PL_initav)
	    call_list(oldscope, PL_initav);
    }

    /* do it */

    if (PL_restartop) {
	PL_op = PL_restartop;
	PL_restartop = 0;
	CALLRUNOPS(aTHX);
    }
    else if (PL_main_start) {
	CvDEPTH(PL_main_cv) = 1;
	PL_op = PL_main_start;
	CALLRUNOPS(aTHX);
    }

    my_exit(0);
    /* NOTREACHED */
    return NULL;
}

/*
=for apidoc p||get_sv

Returns the SV of the specified Perl scalar.  If C<create> is set and the
Perl variable does not exist then it will be created.  If C<create> is not
set and the variable does not exist then NULL is returned.

=cut
*/

SV*
Perl_get_sv(pTHX_ const char *name, I32 create)
{
    GV *gv;
#ifdef USE_THREADS
    if (name[1] == '\0' && !isALPHA(name[0])) {
	PADOFFSET tmp = find_threadsv(name);
    	if (tmp != NOT_IN_PAD) {
	    dTHR;
	    return THREADSV(tmp);
	}
    }
#endif /* USE_THREADS */
    gv = gv_fetchpv(name, create, SVt_PV);
    if (gv)
	return GvSV(gv);
    return Nullsv;
}

/*
=for apidoc p||get_av

Returns the AV of the specified Perl array.  If C<create> is set and the
Perl variable does not exist then it will be created.  If C<create> is not
set and the variable does not exist then NULL is returned.

=cut
*/

AV*
Perl_get_av(pTHX_ const char *name, I32 create)
{
    GV* gv = gv_fetchpv(name, create, SVt_PVAV);
    if (create)
    	return GvAVn(gv);
    if (gv)
	return GvAV(gv);
    return Nullav;
}

/*
=for apidoc p||get_hv

Returns the HV of the specified Perl hash.  If C<create> is set and the
Perl variable does not exist then it will be created.  If C<create> is not
set and the variable does not exist then NULL is returned.

=cut
*/

HV*
Perl_get_hv(pTHX_ const char *name, I32 create)
{
    GV* gv = gv_fetchpv(name, create, SVt_PVHV);
    if (create)
    	return GvHVn(gv);
    if (gv)
	return GvHV(gv);
    return Nullhv;
}

/*
=for apidoc p||get_cv

Returns the CV of the specified Perl subroutine.  If C<create> is set and
the Perl subroutine does not exist then it will be declared (which has the
same effect as saying C<sub name;>).  If C<create> is not set and the
subroutine does not exist then NULL is returned.

=cut
*/

CV*
Perl_get_cv(pTHX_ const char *name, I32 create)
{
    GV* gv = gv_fetchpv(name, create, SVt_PVCV);
    /* XXX unsafe for threads if eval_owner isn't held */
    /* XXX this is probably not what they think they're getting.
     * It has the same effect as "sub name;", i.e. just a forward
     * declaration! */
    if (create && !GvCVu(gv))
    	return newSUB(start_subparse(FALSE, 0),
		      newSVOP(OP_CONST, 0, newSVpv(name,0)),
		      Nullop,
		      Nullop);
    if (gv)
	return GvCVu(gv);
    return Nullcv;
}

/* Be sure to refetch the stack pointer after calling these routines. */

/*
=for apidoc p||call_argv

Performs a callback to the specified Perl sub.  See L<perlcall>.

=cut
*/

I32
Perl_call_argv(pTHX_ const char *sub_name, I32 flags, register char **argv)
              
          		/* See G_* flags in cop.h */
                     	/* null terminated arg list */
{
    dSP;

    PUSHMARK(SP);
    if (argv) {
	while (*argv) {
	    XPUSHs(sv_2mortal(newSVpv(*argv,0)));
	    argv++;
	}
	PUTBACK;
    }
    return call_pv(sub_name, flags);
}

/*
=for apidoc p||call_pv

Performs a callback to the specified Perl sub.  See L<perlcall>.

=cut
*/

I32
Perl_call_pv(pTHX_ const char *sub_name, I32 flags)
              		/* name of the subroutine */
          		/* See G_* flags in cop.h */
{
    return call_sv((SV*)get_cv(sub_name, TRUE), flags);
}

/*
=for apidoc p||call_method

Performs a callback to the specified Perl method.  The blessed object must
be on the stack.  See L<perlcall>.

=cut
*/

I32
Perl_call_method(pTHX_ const char *methname, I32 flags)
               		/* name of the subroutine */
          		/* See G_* flags in cop.h */
{
    dSP;
    OP myop;
    if (!PL_op)
	PL_op = &myop;
    XPUSHs(sv_2mortal(newSVpv(methname,0)));
    PUTBACK;
    pp_method();
	if(PL_op == &myop)
		PL_op = Nullop;
    return call_sv(*PL_stack_sp--, flags);
}

/* May be called with any of a CV, a GV, or an SV containing the name. */
/*
=for apidoc p||call_sv

Performs a callback to the Perl sub whose name is in the SV.  See
L<perlcall>.

=cut
*/

I32
Perl_call_sv(pTHX_ SV *sv, I32 flags)
       
          		/* See G_* flags in cop.h */
{
    dSP;
    LOGOP myop;		/* fake syntax tree node */
    I32 oldmark;
    I32 retval;
    I32 oldscope;
    bool oldcatch = CATCH_GET;
    int ret;
    OP* oldop = PL_op;
    dJMPENV;

    if (flags & G_DISCARD) {
	ENTER;
	SAVETMPS;
    }

    Zero(&myop, 1, LOGOP);
    myop.op_next = Nullop;
    if (!(flags & G_NOARGS))
	myop.op_flags |= OPf_STACKED;
    myop.op_flags |= ((flags & G_VOID) ? OPf_WANT_VOID :
		      (flags & G_ARRAY) ? OPf_WANT_LIST :
		      OPf_WANT_SCALAR);
    SAVEOP();
    PL_op = (OP*)&myop;

    EXTEND(PL_stack_sp, 1);
    *++PL_stack_sp = sv;
    oldmark = TOPMARK;
    oldscope = PL_scopestack_ix;

    if (PERLDB_SUB && PL_curstash != PL_debstash
	   /* Handle first BEGIN of -d. */
	  && (PL_DBcv || (PL_DBcv = GvCV(PL_DBsub)))
	   /* Try harder, since this may have been a sighandler, thus
	    * curstash may be meaningless. */
	  && (SvTYPE(sv) != SVt_PVCV || CvSTASH((CV*)sv) != PL_debstash)
	  && !(flags & G_NODEBUG))
	PL_op->op_private |= OPpENTERSUB_DB;

    if (!(flags & G_EVAL)) {
	CATCH_SET(TRUE);
	call_xbody((OP*)&myop, FALSE);
	retval = PL_stack_sp - (PL_stack_base + oldmark);
	CATCH_SET(oldcatch);
    }
    else {
	cLOGOP->op_other = PL_op;
	PL_markstack_ptr--;
	/* we're trying to emulate pp_entertry() here */
	{
	    register PERL_CONTEXT *cx;
	    I32 gimme = GIMME_V;
	    
	    ENTER;
	    SAVETMPS;
	    
	    push_return(PL_op->op_next);
	    PUSHBLOCK(cx, CXt_EVAL, PL_stack_sp);
	    PUSHEVAL(cx, 0, 0);
	    PL_eval_root = PL_op;             /* Only needed so that goto works right. */
	    
	    PL_in_eval = EVAL_INEVAL;
	    if (flags & G_KEEPERR)
		PL_in_eval |= EVAL_KEEPERR;
	    else
		sv_setpv(ERRSV,"");
	}
	PL_markstack_ptr++;

  redo_body:
	CALLPROTECT(aTHX_ pcur_env, &ret, MEMBER_TO_FPTR(S_call_body),
		    (OP*)&myop, FALSE);
	switch (ret) {
	case 0:
	    retval = PL_stack_sp - (PL_stack_base + oldmark);
	    if (!(flags & G_KEEPERR))
		sv_setpv(ERRSV,"");
	    break;
	case 1:
	    STATUS_ALL_FAILURE;
	    /* FALL THROUGH */
	case 2:
	    /* my_exit() was called */
	    PL_curstash = PL_defstash;
	    FREETMPS;
	    if (PL_statusvalue && !(PL_exit_flags & PERL_EXIT_EXPECTED))
		Perl_croak(aTHX_ "Callback called exit");
	    my_exit_jump();
	    /* NOTREACHED */
	case 3:
	    if (PL_restartop) {
		PL_op = PL_restartop;
		PL_restartop = 0;
		goto redo_body;
	    }
	    PL_stack_sp = PL_stack_base + oldmark;
	    if (flags & G_ARRAY)
		retval = 0;
	    else {
		retval = 1;
		*++PL_stack_sp = &PL_sv_undef;
	    }
	    break;
	}

	if (PL_scopestack_ix > oldscope) {
	    SV **newsp;
	    PMOP *newpm;
	    I32 gimme;
	    register PERL_CONTEXT *cx;
	    I32 optype;

	    POPBLOCK(cx,newpm);
	    POPEVAL(cx);
	    pop_return();
	    PL_curpm = newpm;
	    LEAVE;
	}
    }

    if (flags & G_DISCARD) {
	PL_stack_sp = PL_stack_base + oldmark;
	retval = 0;
	FREETMPS;
	LEAVE;
    }
    PL_op = oldop;
    return retval;
}

STATIC void *
S_call_body(pTHX_ va_list args)
{
    OP *myop = va_arg(args, OP*);
    int is_eval = va_arg(args, int);

    call_xbody(myop, is_eval);
    return NULL;
}

STATIC void
S_call_xbody(pTHX_ OP *myop, int is_eval)
{
    dTHR;

    if (PL_op == myop) {
	if (is_eval)
	    PL_op = Perl_pp_entereval(aTHX);
	else
	    PL_op = Perl_pp_entersub(aTHX);
    }
    if (PL_op)
	CALLRUNOPS(aTHX);
}

/* Eval a string. The G_EVAL flag is always assumed. */

/*
=for apidoc p||eval_sv

Tells Perl to C<eval> the string in the SV.

=cut
*/

I32
Perl_eval_sv(pTHX_ SV *sv, I32 flags)
       
          		/* See G_* flags in cop.h */
{
    dSP;
    UNOP myop;		/* fake syntax tree node */
    I32 oldmark = SP - PL_stack_base;
    I32 retval;
    I32 oldscope;
    int ret;
    OP* oldop = PL_op;
    dJMPENV;

    if (flags & G_DISCARD) {
	ENTER;
	SAVETMPS;
    }

    SAVEOP();
    PL_op = (OP*)&myop;
    Zero(PL_op, 1, UNOP);
    EXTEND(PL_stack_sp, 1);
    *++PL_stack_sp = sv;
    oldscope = PL_scopestack_ix;

    if (!(flags & G_NOARGS))
	myop.op_flags = OPf_STACKED;
    myop.op_next = Nullop;
    myop.op_type = OP_ENTEREVAL;
    myop.op_flags |= ((flags & G_VOID) ? OPf_WANT_VOID :
		      (flags & G_ARRAY) ? OPf_WANT_LIST :
		      OPf_WANT_SCALAR);
    if (flags & G_KEEPERR)
	myop.op_flags |= OPf_SPECIAL;

 redo_body:
    CALLPROTECT(aTHX_ pcur_env, &ret, MEMBER_TO_FPTR(S_call_body),
		(OP*)&myop, TRUE);
    switch (ret) {
    case 0:
	retval = PL_stack_sp - (PL_stack_base + oldmark);
	if (!(flags & G_KEEPERR))
	    sv_setpv(ERRSV,"");
	break;
    case 1:
	STATUS_ALL_FAILURE;
	/* FALL THROUGH */
    case 2:
	/* my_exit() was called */
	PL_curstash = PL_defstash;
	FREETMPS;
	if (PL_statusvalue && !(PL_exit_flags & PERL_EXIT_EXPECTED))
	    Perl_croak(aTHX_ "Callback called exit");
	my_exit_jump();
	/* NOTREACHED */
    case 3:
	if (PL_restartop) {
	    PL_op = PL_restartop;
	    PL_restartop = 0;
	    goto redo_body;
	}
	PL_stack_sp = PL_stack_base + oldmark;
	if (flags & G_ARRAY)
	    retval = 0;
	else {
	    retval = 1;
	    *++PL_stack_sp = &PL_sv_undef;
	}
	break;
    }

    if (flags & G_DISCARD) {
	PL_stack_sp = PL_stack_base + oldmark;
	retval = 0;
	FREETMPS;
	LEAVE;
    }
    PL_op = oldop;
    return retval;
}

/*
=for apidoc p||eval_pv

Tells Perl to C<eval> the given string and return an SV* result.

=cut
*/

SV*
Perl_eval_pv(pTHX_ const char *p, I32 croak_on_error)
{
    dSP;
    SV* sv = newSVpv(p, 0);

    PUSHMARK(SP);
    eval_sv(sv, G_SCALAR);
    SvREFCNT_dec(sv);

    SPAGAIN;
    sv = POPs;
    PUTBACK;

    if (croak_on_error && SvTRUE(ERRSV)) {
	STRLEN n_a;
	Perl_croak(aTHX_ SvPVx(ERRSV, n_a));
    }

    return sv;
}

/* Require a module. */

/*
=for apidoc p||require_pv

Tells Perl to C<require> a module.

=cut
*/

void
Perl_require_pv(pTHX_ const char *pv)
{
    SV* sv;
    dSP;
    PUSHSTACKi(PERLSI_REQUIRE);
    PUTBACK;
    sv = sv_newmortal();
    sv_setpv(sv, "require '");
    sv_catpv(sv, pv);
    sv_catpv(sv, "'");
    eval_sv(sv, G_DISCARD);
    SPAGAIN;
    POPSTACK;
}

void
Perl_magicname(pTHX_ char *sym, char *name, I32 namlen)
{
    register GV *gv;

    if (gv = gv_fetchpv(sym,TRUE, SVt_PV))
	sv_magic(GvSV(gv), (SV*)gv, 0, name, namlen);
}

STATIC void
S_usage(pTHX_ char *name)		/* XXX move this out into a module ? */
{
    /* This message really ought to be max 23 lines.
     * Removed -h because the user already knows that opton. Others? */

    static char *usage_msg[] = {
"-0[octal]       specify record separator (\\0, if no argument)",
"-a              autosplit mode with -n or -p (splits $_ into @F)",
"-c              check syntax only (runs BEGIN and END blocks)",
"-d[:debugger]   run program under debugger",
"-D[number/list] set debugging flags (argument is a bit mask or alphabets)",
"-e 'command'    one line of program (several -e's allowed, omit programfile)",
"-F/pattern/     split() pattern for -a switch (//'s are optional)",
"-i[extension]   edit <> files in place (makes backup if extension supplied)",
"-Idirectory     specify @INC/#include directory (several -I's allowed)",
"-l[octal]       enable line ending processing, specifies line terminator",
"-[mM][-]module  execute `use/no module...' before executing program",
"-n              assume 'while (<>) { ... }' loop around program",
"-p              assume loop like -n but print line also, like sed",
"-P              run program through C preprocessor before compilation",
"-s              enable rudimentary parsing for switches after programfile",
"-S              look for programfile using PATH environment variable",
"-T              enable tainting checks",
"-u              dump core after parsing program",
"-U              allow unsafe operations",
"-v              print version, subversion (includes VERY IMPORTANT perl info)",
"-V[:variable]   print configuration summary (or a single Config.pm variable)",
"-w              enable many useful warnings (RECOMMENDED)",
"-x[directory]   strip off text before #!perl line and perhaps cd to directory",
"\n",
NULL
};
    char **p = usage_msg;

    printf("\nUsage: %s [switches] [--] [programfile] [arguments]", name);
    while (*p)
	printf("\n  %s", *p++);
}

/* This routine handles any switches that can be given during run */

char *
Perl_moreswitches(pTHX_ char *s)
{
    I32 numlen;
    U32 rschar;

    switch (*s) {
    case '0':
    {
	dTHR;
	rschar = (U32)scan_oct(s, 4, &numlen);
	SvREFCNT_dec(PL_nrs);
	if (rschar & ~((U8)~0))
	    PL_nrs = &PL_sv_undef;
	else if (!rschar && numlen >= 2)
	    PL_nrs = newSVpvn("", 0);
	else {
	    char ch = rschar;
	    PL_nrs = newSVpvn(&ch, 1);
	}
	return s + numlen;
    }
    case 'F':
	PL_minus_F = TRUE;
	PL_splitstr = savepv(s + 1);
	s += strlen(s);
	return s;
    case 'a':
	PL_minus_a = TRUE;
	s++;
	return s;
    case 'c':
	PL_minus_c = TRUE;
	s++;
	return s;
    case 'd':
	forbid_setid("-d");
	s++;
	if (*s == ':' || *s == '=')  {
	    my_setenv("PERL5DB", Perl_form(aTHX_ "use Devel::%s;", ++s));
	    s += strlen(s);
	}
	if (!PL_perldb) {
	    PL_perldb = PERLDB_ALL;
	    init_debugger();
	}
	return s;
    case 'D':
    {	
#ifdef DEBUGGING
	forbid_setid("-D");
	if (isALPHA(s[1])) {
	    static char debopts[] = "psltocPmfrxuLHXDS";
	    char *d;

	    for (s++; *s && (d = strchr(debopts,*s)); s++)
		PL_debug |= 1 << (d - debopts);
	}
	else {
	    PL_debug = atoi(s+1);
	    for (s++; isDIGIT(*s); s++) ;
	}
	PL_debug |= 0x80000000;
#else
	dTHR;
	if (ckWARN_d(WARN_DEBUGGING))
	    Perl_warner(aTHX_ WARN_DEBUGGING,
	           "Recompile perl with -DDEBUGGING to use -D switch\n");
	for (s++; isALNUM(*s); s++) ;
#endif
	/*SUPPRESS 530*/
	return s;
    }	
    case 'h':
	usage(PL_origargv[0]);    
	PerlProc_exit(0);
    case 'i':
	if (PL_inplace)
	    Safefree(PL_inplace);
	PL_inplace = savepv(s+1);
	/*SUPPRESS 530*/
	for (s = PL_inplace; *s && !isSPACE(*s); s++) ;
	if (*s) {
	    *s++ = '\0';
	    if (*s == '-')	/* Additional switches on #! line. */
	        s++;
	}
	return s;
    case 'I':	/* -I handled both here and in parse_perl() */
	forbid_setid("-I");
	++s;
	while (*s && isSPACE(*s))
	    ++s;
	if (*s) {
	    char *e, *p;
	    p = s;
	    /* ignore trailing spaces (possibly followed by other switches) */
	    do {
		for (e = p; *e && !isSPACE(*e); e++) ;
		p = e;
		while (isSPACE(*p))
		    p++;
	    } while (*p && *p != '-');
	    e = savepvn(s, e-s);
	    incpush(e, TRUE);
	    Safefree(e);
	    s = p;
	    if (*s == '-')
		s++;
	}
	else
	    Perl_croak(aTHX_ "No directory specified for -I");
	return s;
    case 'l':
	PL_minus_l = TRUE;
	s++;
	if (PL_ors)
	    Safefree(PL_ors);
	if (isDIGIT(*s)) {
	    PL_ors = savepv("\n");
	    PL_orslen = 1;
	    *PL_ors = (char)scan_oct(s, 3 + (*s == '0'), &numlen);
	    s += numlen;
	}
	else {
	    dTHR;
	    if (RsPARA(PL_nrs)) {
		PL_ors = "\n\n";
		PL_orslen = 2;
	    }
	    else
		PL_ors = SvPV(PL_nrs, PL_orslen);
	    PL_ors = savepvn(PL_ors, PL_orslen);
	}
	return s;
    case 'M':
	forbid_setid("-M");	/* XXX ? */
	/* FALL THROUGH */
    case 'm':
	forbid_setid("-m");	/* XXX ? */
	if (*++s) {
	    char *start;
	    SV *sv;
	    char *use = "use ";
	    /* -M-foo == 'no foo'	*/
	    if (*s == '-') { use = "no "; ++s; }
	    sv = newSVpv(use,0);
	    start = s;
	    /* We allow -M'Module qw(Foo Bar)'	*/
	    while(isALNUM(*s) || *s==':') ++s;
	    if (*s != '=') {
		sv_catpv(sv, start);
		if (*(start-1) == 'm') {
		    if (*s != '\0')
			Perl_croak(aTHX_ "Can't use '%c' after -mname", *s);
		    sv_catpv( sv, " ()");
		}
	    } else {
		sv_catpvn(sv, start, s-start);
		sv_catpv(sv, " split(/,/,q{");
		sv_catpv(sv, ++s);
		sv_catpv(sv,    "})");
	    }
	    s += strlen(s);
	    if (!PL_preambleav)
		PL_preambleav = newAV();
	    av_push(PL_preambleav, sv);
	}
	else
	    Perl_croak(aTHX_ "No space allowed after -%c", *(s-1));
	return s;
    case 'n':
	PL_minus_n = TRUE;
	s++;
	return s;
    case 'p':
	PL_minus_p = TRUE;
	s++;
	return s;
    case 's':
	forbid_setid("-s");
	PL_doswitches = TRUE;
	s++;
	return s;
    case 'T':
	if (!PL_tainting)
	    Perl_croak(aTHX_ "Too late for \"-T\" option");
	s++;
	return s;
    case 'u':
	PL_do_undump = TRUE;
	s++;
	return s;
    case 'U':
	PL_unsafe = TRUE;
	s++;
	return s;
    case 'v':
	printf(Perl_form(aTHX_ "\nThis is perl, v%v built for %s",
			 PL_patchlevel, ARCHNAME));
#if defined(LOCAL_PATCH_COUNT)
	if (LOCAL_PATCH_COUNT > 0)
	    printf("\n(with %d registered patch%s, see perl -V for more detail)",
		(int)LOCAL_PATCH_COUNT, (LOCAL_PATCH_COUNT!=1) ? "es" : "");
#endif

	printf("\n\nCopyright 1987-2000, Larry Wall\n");
#ifdef MSDOS
	printf("\nMS-DOS port Copyright (c) 1989, 1990, Diomidis Spinellis\n");
#endif
#ifdef DJGPP
	printf("djgpp v2 port (jpl5003c) by Hirofumi Watanabe, 1996\n");
	printf("djgpp v2 port (perl5004+) by Laszlo Molnar, 1997-1999\n");
#endif
#ifdef OS2
	printf("\n\nOS/2 port Copyright (c) 1990, 1991, Raymond Chen, Kai Uwe Rommel\n"
	    "Version 5 port Copyright (c) 1994-1999, Andreas Kaiser, Ilya Zakharevich\n");
#endif
#ifdef atarist
	printf("atariST series port, ++jrb  bammi@cadence.com\n");
#endif
#ifdef __BEOS__
	printf("BeOS port Copyright Tom Spindler, 1997-1999\n");
#endif
#ifdef MPE
	printf("MPE/iX port Copyright by Mark Klein and Mark Bixby, 1996-1999\n");
#endif
#ifdef OEMVS
	printf("MVS (OS390) port by Mortice Kern Systems, 1997-1999\n");
#endif
#ifdef __VOS__
	printf("Stratus VOS port by Paul_Green@stratus.com, 1997-1999\n");
#endif
#ifdef __OPEN_VM
	printf("VM/ESA port by Neale Ferguson, 1998-1999\n");
#endif
#ifdef POSIX_BC
	printf("BS2000 (POSIX) port by Start Amadeus GmbH, 1998-1999\n");
#endif
#ifdef __MINT__
	printf("MiNT port by Guido Flohr, 1997-1999\n");
#endif
#ifdef BINARY_BUILD_NOTICE
	BINARY_BUILD_NOTICE;
#endif
	printf("\n\
Perl may be copied only under the terms of either the Artistic License or the\n\
GNU General Public License, which may be found in the Perl 5.0 source kit.\n\n\
Complete documentation for Perl, including FAQ lists, should be found on\n\
this system using `man perl' or `perldoc perl'.  If you have access to the\n\
Internet, point your browser at http://www.perl.com/, the Perl Home Page.\n\n");
	PerlProc_exit(0);
    case 'w':
	if (! (PL_dowarn & G_WARN_ALL_MASK))
	    PL_dowarn |= G_WARN_ON; 
	s++;
	return s;
    case 'W':
	PL_dowarn = G_WARN_ALL_ON|G_WARN_ON; 
	PL_compiling.cop_warnings = WARN_ALL ;
	s++;
	return s;
    case 'X':
	PL_dowarn = G_WARN_ALL_OFF; 
	PL_compiling.cop_warnings = WARN_NONE ;
	s++;
	return s;
    case '*':
    case ' ':
	if (s[1] == '-')	/* Additional switches on #! line. */
	    return s+2;
	break;
    case '-':
    case 0:
#if defined(WIN32) || !defined(PERL_STRICT_CR)
    case '\r':
#endif
    case '\n':
    case '\t':
	break;
#ifdef ALTERNATE_SHEBANG
    case 'S':			/* OS/2 needs -S on "extproc" line. */
	break;
#endif
    case 'P':
	if (PL_preprocess)
	    return s+1;
	/* FALL THROUGH */
    default:
	Perl_croak(aTHX_ "Can't emulate -%.1s on #! line",s);
    }
    return Nullch;
}

/* compliments of Tom Christiansen */

/* unexec() can be found in the Gnu emacs distribution */
/* Known to work with -DUNEXEC and using unexelf.c from GNU emacs-20.2 */

void
Perl_my_unexec(pTHX)
{
#ifdef UNEXEC
    SV*    prog;
    SV*    file;
    int    status = 1;
    extern int etext;

    prog = newSVpv(BIN_EXP, 0);
    sv_catpv(prog, "/perl");
    file = newSVpv(PL_origfilename, 0);
    sv_catpv(file, ".perldump");

    unexec(SvPVX(file), SvPVX(prog), &etext, sbrk(0), 0);
    /* unexec prints msg to stderr in case of failure */
    PerlProc_exit(status);
#else
#  ifdef VMS
#    include <lib$routines.h>
     lib$signal(SS$_DEBUG);  /* ssdef.h #included from vmsish.h */
#  else
    ABORT();		/* for use with undump */
#  endif
#endif
}

/* initialize curinterp */
STATIC void
S_init_interp(pTHX)
{

#ifdef PERL_OBJECT		/* XXX kludge */
#define I_REINIT \
  STMT_START {				\
    PL_chopset		= " \n-";	\
    PL_copline		= NOLINE;	\
    PL_curcop		= &PL_compiling;\
    PL_curcopdb		= NULL;		\
    PL_dbargs		= 0;		\
    PL_dumpindent	= 4;		\
    PL_laststatval	= -1;		\
    PL_laststype	= OP_STAT;	\
    PL_maxscream	= -1;		\
    PL_maxsysfd		= MAXSYSFD;	\
    PL_statname		= Nullsv;	\
    PL_tmps_floor	= -1;		\
    PL_tmps_ix		= -1;		\
    PL_op_mask		= NULL;		\
    PL_laststatval	= -1;		\
    PL_laststype	= OP_STAT;	\
    PL_mess_sv		= Nullsv;	\
    PL_splitstr		= " ";		\
    PL_generation	= 100;		\
    PL_exitlist		= NULL;		\
    PL_exitlistlen	= 0;		\
    PL_regindent	= 0;		\
    PL_in_clean_objs	= FALSE;	\
    PL_in_clean_all	= FALSE;	\
    PL_profiledata	= NULL;		\
    PL_rsfp		= Nullfp;	\
    PL_rsfp_filters	= Nullav;	\
    PL_dirty		= FALSE;	\
  } STMT_END
    I_REINIT;
#else
#  ifdef MULTIPLICITY
#    define PERLVAR(var,type)
#    define PERLVARA(var,n,type)
#    if defined(PERL_IMPLICIT_CONTEXT)
#      if defined(USE_THREADS)
#        define PERLVARI(var,type,init)		PERL_GET_INTERP->var = init;
#        define PERLVARIC(var,type,init)	PERL_GET_INTERP->var = init;
#      else /* !USE_THREADS */
#        define PERLVARI(var,type,init)		aTHX->var = init;
#        define PERLVARIC(var,type,init)	aTHX->var = init;
#      endif /* USE_THREADS */
#    else
#      define PERLVARI(var,type,init)	PERL_GET_INTERP->var = init;
#      define PERLVARIC(var,type,init)	PERL_GET_INTERP->var = init;
#    endif
#    include "intrpvar.h"
#    ifndef USE_THREADS
#      include "thrdvar.h"
#    endif
#    undef PERLVAR
#    undef PERLVARA
#    undef PERLVARI
#    undef PERLVARIC
#  else
#    define PERLVAR(var,type)
#    define PERLVARA(var,n,type)
#    define PERLVARI(var,type,init)	PL_##var = init;
#    define PERLVARIC(var,type,init)	PL_##var = init;
#    include "intrpvar.h"
#    ifndef USE_THREADS
#      include "thrdvar.h"
#    endif
#    undef PERLVAR
#    undef PERLVARA
#    undef PERLVARI
#    undef PERLVARIC
#  endif
#endif

}

STATIC void
S_init_main_stash(pTHX)
{
    dTHR;
    GV *gv;

    /* Note that strtab is a rather special HV.  Assumptions are made
       about not iterating on it, and not adding tie magic to it.
       It is properly deallocated in perl_destruct() */
    PL_strtab = newHV();
#ifdef USE_THREADS
    MUTEX_INIT(&PL_strtab_mutex);
#endif
    HvSHAREKEYS_off(PL_strtab);			/* mandatory */
    hv_ksplit(PL_strtab, 512);
    
    PL_curstash = PL_defstash = newHV();
    PL_curstname = newSVpvn("main",4);
    gv = gv_fetchpv("main::",TRUE, SVt_PVHV);
    SvREFCNT_dec(GvHV(gv));
    GvHV(gv) = (HV*)SvREFCNT_inc(PL_defstash);
    SvREADONLY_on(gv);
    HvNAME(PL_defstash) = savepv("main");
    PL_incgv = gv_HVadd(gv_AVadd(gv_fetchpv("INC",TRUE, SVt_PVAV)));
    GvMULTI_on(PL_incgv);
    PL_hintgv = gv_fetchpv("\010",TRUE, SVt_PV); /* ^H */
    GvMULTI_on(PL_hintgv);
    PL_defgv = gv_fetchpv("_",TRUE, SVt_PVAV);
    PL_errgv = gv_HVadd(gv_fetchpv("@", TRUE, SVt_PV));
    GvMULTI_on(PL_errgv);
    PL_replgv = gv_fetchpv("\022", TRUE, SVt_PV); /* ^R */
    GvMULTI_on(PL_replgv);
    (void)Perl_form(aTHX_ "%240s","");	/* Preallocate temp - for immediate signals. */
    sv_grow(ERRSV, 240);	/* Preallocate - for immediate signals. */
    sv_setpvn(ERRSV, "", 0);
    PL_curstash = PL_defstash;
    CopSTASH_set(&PL_compiling, PL_defstash);
    PL_debstash = GvHV(gv_fetchpv("DB::", GV_ADDMULTI, SVt_PVHV));
    PL_globalstash = GvHV(gv_fetchpv("CORE::GLOBAL::", GV_ADDMULTI, SVt_PVHV));
    /* We must init $/ before switches are processed. */
    sv_setpvn(get_sv("/", TRUE), "\n", 1);
}

STATIC void
S_open_script(pTHX_ char *scriptname, bool dosearch, SV *sv, int *fdscript)
{
    dTHR;
    register char *s;

    *fdscript = -1;

    if (PL_e_script) {
	PL_origfilename = savepv("-e");
    }
    else {
	/* if find_script() returns, it returns a malloc()-ed value */
	PL_origfilename = scriptname = find_script(scriptname, dosearch, NULL, 1);

	if (strnEQ(scriptname, "/dev/fd/", 8) && isDIGIT(scriptname[8]) ) {
	    char *s = scriptname + 8;
	    *fdscript = atoi(s);
	    while (isDIGIT(*s))
		s++;
	    if (*s) {
		scriptname = savepv(s + 1);
		Safefree(PL_origfilename);
		PL_origfilename = scriptname;
	    }
	}
    }

    CopFILE_set(PL_curcop, PL_origfilename);
    if (strEQ(PL_origfilename,"-"))
	scriptname = "";
    if (*fdscript >= 0) {
	PL_rsfp = PerlIO_fdopen(*fdscript,PERL_SCRIPT_MODE);
#if defined(HAS_FCNTL) && defined(F_SETFD)
	if (PL_rsfp)
	    fcntl(PerlIO_fileno(PL_rsfp),F_SETFD,1);  /* ensure close-on-exec */
#endif
    }
    else if (PL_preprocess) {
	char *cpp_cfg = CPPSTDIN;
	SV *cpp = newSVpvn("",0);
	SV *cmd = NEWSV(0,0);

	if (strEQ(cpp_cfg, "cppstdin"))
	    Perl_sv_catpvf(aTHX_ cpp, "%s/", BIN_EXP);
	sv_catpv(cpp, cpp_cfg);

	sv_catpvn(sv, "-I", 2);
	sv_catpv(sv,PRIVLIB_EXP);

#ifdef MSDOS
	Perl_sv_setpvf(aTHX_ cmd, "\
sed %s -e \"/^[^#]/b\" \
 -e \"/^#[ 	]*include[ 	]/b\" \
 -e \"/^#[ 	]*define[ 	]/b\" \
 -e \"/^#[ 	]*if[ 	]/b\" \
 -e \"/^#[ 	]*ifdef[ 	]/b\" \
 -e \"/^#[ 	]*ifndef[ 	]/b\" \
 -e \"/^#[ 	]*else/b\" \
 -e \"/^#[ 	]*elif[ 	]/b\" \
 -e \"/^#[ 	]*undef[ 	]/b\" \
 -e \"/^#[ 	]*endif/b\" \
 -e \"s/^#.*//\" \
 %s | %"SVf" -C %"SVf" %s",
	  (PL_doextract ? "-e \"1,/^#/d\n\"" : ""),
#else
#  ifdef __OPEN_VM
	Perl_sv_setpvf(aTHX_ cmd, "\
%s %s -e '/^[^#]/b' \
 -e '/^#[ 	]*include[ 	]/b' \
 -e '/^#[ 	]*define[ 	]/b' \
 -e '/^#[ 	]*if[ 	]/b' \
 -e '/^#[ 	]*ifdef[ 	]/b' \
 -e '/^#[ 	]*ifndef[ 	]/b' \
 -e '/^#[ 	]*else/b' \
 -e '/^#[ 	]*elif[ 	]/b' \
 -e '/^#[ 	]*undef[ 	]/b' \
 -e '/^#[ 	]*endif/b' \
 -e 's/^[ 	]*#.*//' \
 %s | %"SVf" %"SVf" %s",
#  else
	Perl_sv_setpvf(aTHX_ cmd, "\
%s %s -e '/^[^#]/b' \
 -e '/^#[ 	]*include[ 	]/b' \
 -e '/^#[ 	]*define[ 	]/b' \
 -e '/^#[ 	]*if[ 	]/b' \
 -e '/^#[ 	]*ifdef[ 	]/b' \
 -e '/^#[ 	]*ifndef[ 	]/b' \
 -e '/^#[ 	]*else/b' \
 -e '/^#[ 	]*elif[ 	]/b' \
 -e '/^#[ 	]*undef[ 	]/b' \
 -e '/^#[ 	]*endif/b' \
 -e 's/^[ 	]*#.*//' \
 %s | %"SVf" -C %"SVf" %s",
#  endif
#ifdef LOC_SED
	  LOC_SED,
#else
	  "sed",
#endif
	  (PL_doextract ? "-e '1,/^#/d\n'" : ""),
#endif
	  scriptname, cpp, sv, CPPMINUS);
	PL_doextract = FALSE;
#ifdef IAMSUID				/* actually, this is caught earlier */
	if (PL_euid != PL_uid && !PL_euid) {	/* if running suidperl */
#ifdef HAS_SETEUID
	    (void)seteuid(PL_uid);		/* musn't stay setuid root */
#else
#ifdef HAS_SETREUID
	    (void)setreuid((Uid_t)-1, PL_uid);
#else
#ifdef HAS_SETRESUID
	    (void)setresuid((Uid_t)-1, PL_uid, (Uid_t)-1);
#else
	    PerlProc_setuid(PL_uid);
#endif
#endif
#endif
	    if (PerlProc_geteuid() != PL_uid)
		Perl_croak(aTHX_ "Can't do seteuid!\n");
	}
#endif /* IAMSUID */
	PL_rsfp = PerlProc_popen(SvPVX(cmd), "r");
	SvREFCNT_dec(cmd);
	SvREFCNT_dec(cpp);
    }
    else if (!*scriptname) {
	forbid_setid("program input from stdin");
	PL_rsfp = PerlIO_stdin();
    }
    else {
	PL_rsfp = PerlIO_open(scriptname,PERL_SCRIPT_MODE);
#if defined(HAS_FCNTL) && defined(F_SETFD)
	if (PL_rsfp)
	    fcntl(PerlIO_fileno(PL_rsfp),F_SETFD,1);  /* ensure close-on-exec */
#endif
    }
    if (!PL_rsfp) {
#ifdef DOSUID
#ifndef IAMSUID		/* in case script is not readable before setuid */
	if (PL_euid &&
	    PerlLIO_stat(CopFILE(PL_curcop),&PL_statbuf) >= 0 &&
	    PL_statbuf.st_mode & (S_ISUID|S_ISGID))
	{
	    /* try again */
	    PerlProc_execv(Perl_form(aTHX_ "%s/sperl"PERL_FS_VER_FMT, BIN_EXP,
				     (int)PERL_REVISION, (int)PERL_VERSION,
				     (int)PERL_SUBVERSION), PL_origargv);
	    Perl_croak(aTHX_ "Can't do setuid\n");
	}
#endif
#endif
	Perl_croak(aTHX_ "Can't open perl script \"%s\": %s\n",
		   CopFILE(PL_curcop), Strerror(errno));
    }
}

/* Mention
 * I_SYSSTATVFS	HAS_FSTATVFS
 * I_SYSMOUNT
 * I_STATFS	HAS_FSTATFS
 * I_MNTENT	HAS_GETMNTENT	HAS_HASMNTOPT
 * here so that metaconfig picks them up. */

#ifdef IAMSUID
STATIC int
S_fd_on_nosuid_fs(pTHX_ int fd)
{
    int check_okay = 0; /* able to do all the required sys/libcalls */
    int on_nosuid  = 0; /* the fd is on a nosuid fs */
/*
 * Preferred order: fstatvfs(), fstatfs(), ustat()+getmnt(), getmntent().
 * fstatvfs() is UNIX98.
 * fstatfs() is 4.3 BSD.
 * ustat()+getmnt() is pre-4.3 BSD.
 * getmntent() is O(number-of-mounted-filesystems) and can hang on
 * an irrelevant filesystem while trying to reach the right one.
 */

#   ifdef HAS_FSTATVFS
    struct statvfs stfs;
    check_okay = fstatvfs(fd, &stfs) == 0;
    on_nosuid  = check_okay && (stfs.f_flag  & ST_NOSUID);
#   else
#       ifdef PERL_MOUNT_NOSUID
#           if defined(HAS_FSTATFS) && \
	       defined(HAS_STRUCT_STATFS) && \
	       defined(HAS_STRUCT_STATFS_F_FLAGS)
    struct statfs  stfs;
    check_okay = fstatfs(fd, &stfs)  == 0;
    on_nosuid  = check_okay && (stfs.f_flags & PERL_MOUNT_NOSUID);
#           else
#               if defined(HAS_FSTAT) && \
		   defined(HAS_USTAT) && \
		   defined(HAS_GETMNT) && \
		   defined(HAS_STRUCT_FS_DATA) && \
		   defined(NOSTAT_ONE)
    struct stat fdst;
    if (fstat(fd, &fdst) == 0) {
	struct ustat us;
	if (ustat(fdst.st_dev, &us) == 0) {
	    struct fs_data fsd;
	    /* NOSTAT_ONE here because we're not examining fields which
	     * vary between that case and STAT_ONE. */
            if (getmnt((int*)0, &fsd, (int)0, NOSTAT_ONE, us.f_fname) == 0) {
		size_t cmplen = sizeof(us.f_fname);
		if (sizeof(fsd.fd_req.path) < cmplen)
		    cmplen = sizeof(fsd.fd_req.path);
		if (strnEQ(fsd.fd_req.path, us.f_fname, cmplen) &&
		    fdst.st_dev == fsd.fd_req.dev) {
			check_okay = 1;
			on_nosuid = fsd.fd_req.flags & PERL_MOUNT_NOSUID;
		    }
		}
	    }
	}
    }
#               endif /* fstat+ustat+getmnt */
#           endif /* fstatfs */
#       else
#           if defined(HAS_GETMNTENT) && \
	       defined(HAS_HASMNTOPT) && \
	       defined(MNTOPT_NOSUID)
    FILE		*mtab = fopen("/etc/mtab", "r");
    struct mntent	*entry;
    struct stat		stb, fsb;

    if (mtab && (fstat(fd, &stb) == 0)) {
	while (entry = getmntent(mtab)) {
	    if (stat(entry->mnt_dir, &fsb) == 0
		&& fsb.st_dev == stb.st_dev)
	    {
		/* found the filesystem */
		check_okay = 1;
		if (hasmntopt(entry, MNTOPT_NOSUID))
		    on_nosuid = 1;
		break;
	    } /* A single fs may well fail its stat(). */
	}
    }
    if (mtab)
	fclose(mtab);
#           endif /* getmntent+hasmntopt */
#       endif /* PERL_MOUNT_NOSUID: fstatfs or fstat+ustat+statfs */
#   endif /* statvfs */

    if (!check_okay) 
	Perl_croak(aTHX_ "Can't check filesystem of script \"%s\" for nosuid", PL_origfilename);
    return on_nosuid;
}
#endif /* IAMSUID */

STATIC void
S_validate_suid(pTHX_ char *validarg, char *scriptname, int fdscript)
{
    int which;

    /* do we need to emulate setuid on scripts? */

    /* This code is for those BSD systems that have setuid #! scripts disabled
     * in the kernel because of a security problem.  Merely defining DOSUID
     * in perl will not fix that problem, but if you have disabled setuid
     * scripts in the kernel, this will attempt to emulate setuid and setgid
     * on scripts that have those now-otherwise-useless bits set.  The setuid
     * root version must be called suidperl or sperlN.NNN.  If regular perl
     * discovers that it has opened a setuid script, it calls suidperl with
     * the same argv that it had.  If suidperl finds that the script it has
     * just opened is NOT setuid root, it sets the effective uid back to the
     * uid.  We don't just make perl setuid root because that loses the
     * effective uid we had before invoking perl, if it was different from the
     * uid.
     *
     * DOSUID must be defined in both perl and suidperl, and IAMSUID must
     * be defined in suidperl only.  suidperl must be setuid root.  The
     * Configure script will set this up for you if you want it.
     */

#ifdef DOSUID
    dTHR;
    char *s, *s2;

    if (PerlLIO_fstat(PerlIO_fileno(PL_rsfp),&PL_statbuf) < 0)	/* normal stat is insecure */
	Perl_croak(aTHX_ "Can't stat script \"%s\"",PL_origfilename);
    if (fdscript < 0 && PL_statbuf.st_mode & (S_ISUID|S_ISGID)) {
	I32 len;
	STRLEN n_a;

#ifdef IAMSUID
#ifndef HAS_SETREUID
	/* On this access check to make sure the directories are readable,
	 * there is actually a small window that the user could use to make
	 * filename point to an accessible directory.  So there is a faint
	 * chance that someone could execute a setuid script down in a
	 * non-accessible directory.  I don't know what to do about that.
	 * But I don't think it's too important.  The manual lies when
	 * it says access() is useful in setuid programs.
	 */
	if (PerlLIO_access(CopFILE(PL_curcop),1)) /*double check*/
	    Perl_croak(aTHX_ "Permission denied");
#else
	/* If we can swap euid and uid, then we can determine access rights
	 * with a simple stat of the file, and then compare device and
	 * inode to make sure we did stat() on the same file we opened.
	 * Then we just have to make sure he or she can execute it.
	 */
	{
	    struct stat tmpstatbuf;

	    if (
#ifdef HAS_SETREUID
		setreuid(PL_euid,PL_uid) < 0
#else
# if HAS_SETRESUID
		setresuid(PL_euid,PL_uid,(Uid_t)-1) < 0
# endif
#endif
		|| PerlProc_getuid() != PL_euid || PerlProc_geteuid() != PL_uid)
		Perl_croak(aTHX_ "Can't swap uid and euid");	/* really paranoid */
	    if (PerlLIO_stat(CopFILE(PL_curcop),&tmpstatbuf) < 0)
		Perl_croak(aTHX_ "Permission denied");	/* testing full pathname here */
#if defined(IAMSUID) && !defined(NO_NOSUID_CHECK)
	    if (fd_on_nosuid_fs(PerlIO_fileno(PL_rsfp)))
		Perl_croak(aTHX_ "Permission denied");
#endif
	    if (tmpstatbuf.st_dev != PL_statbuf.st_dev ||
		tmpstatbuf.st_ino != PL_statbuf.st_ino) {
		(void)PerlIO_close(PL_rsfp);
		if (PL_rsfp = PerlProc_popen("/bin/mail root","w")) {	/* heh, heh */
		    PerlIO_printf(PL_rsfp,
"User %"Uid_t_f" tried to run dev %ld ino %ld in place of dev %ld ino %ld!\n\
(Filename of set-id script was %s, uid %"Uid_t_f" gid %"Gid_t_f".)\n\nSincerely,\nperl\n",
			PL_uid,(long)tmpstatbuf.st_dev, (long)tmpstatbuf.st_ino,
			(long)PL_statbuf.st_dev, (long)PL_statbuf.st_ino,
			CopFILE(PL_curcop),
			PL_statbuf.st_uid, PL_statbuf.st_gid);
		    (void)PerlProc_pclose(PL_rsfp);
		}
		Perl_croak(aTHX_ "Permission denied\n");
	    }
	    if (
#ifdef HAS_SETREUID
              setreuid(PL_uid,PL_euid) < 0
#else
# if defined(HAS_SETRESUID)
              setresuid(PL_uid,PL_euid,(Uid_t)-1) < 0
# endif
#endif
              || PerlProc_getuid() != PL_uid || PerlProc_geteuid() != PL_euid)
		Perl_croak(aTHX_ "Can't reswap uid and euid");
	    if (!cando(S_IXUSR,FALSE,&PL_statbuf))		/* can real uid exec? */
		Perl_croak(aTHX_ "Permission denied\n");
	}
#endif /* HAS_SETREUID */
#endif /* IAMSUID */

	if (!S_ISREG(PL_statbuf.st_mode))
	    Perl_croak(aTHX_ "Permission denied");
	if (PL_statbuf.st_mode & S_IWOTH)
	    Perl_croak(aTHX_ "Setuid/gid script is writable by world");
	PL_doswitches = FALSE;		/* -s is insecure in suid */
	CopLINE_inc(PL_curcop);
	if (sv_gets(PL_linestr, PL_rsfp, 0) == Nullch ||
	  strnNE(SvPV(PL_linestr,n_a),"#!",2) )	/* required even on Sys V */
	    Perl_croak(aTHX_ "No #! line");
	s = SvPV(PL_linestr,n_a)+2;
	if (*s == ' ') s++;
	while (!isSPACE(*s)) s++;
	for (s2 = s;  (s2 > SvPV(PL_linestr,n_a)+2 &&
		       (isDIGIT(s2[-1]) || strchr("._-", s2[-1])));  s2--) ;
	if (strnNE(s2-4,"perl",4) && strnNE(s-9,"perl",4))  /* sanity check */
	    Perl_croak(aTHX_ "Not a perl script");
	while (*s == ' ' || *s == '\t') s++;
	/*
	 * #! arg must be what we saw above.  They can invoke it by
	 * mentioning suidperl explicitly, but they may not add any strange
	 * arguments beyond what #! says if they do invoke suidperl that way.
	 */
	len = strlen(validarg);
	if (strEQ(validarg," PHOOEY ") ||
	    strnNE(s,validarg,len) || !isSPACE(s[len]))
	    Perl_croak(aTHX_ "Args must match #! line");

#ifndef IAMSUID
	if (PL_euid != PL_uid && (PL_statbuf.st_mode & S_ISUID) &&
	    PL_euid == PL_statbuf.st_uid)
	    if (!PL_do_undump)
		Perl_croak(aTHX_ "YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET!\n\
FIX YOUR KERNEL, PUT A C WRAPPER AROUND THIS SCRIPT, OR USE -u AND UNDUMP!\n");
#endif /* IAMSUID */

	if (PL_euid) {	/* oops, we're not the setuid root perl */
	    (void)PerlIO_close(PL_rsfp);
#ifndef IAMSUID
	    /* try again */
	    PerlProc_execv(Perl_form(aTHX_ "%s/sperl"PERL_FS_VER_FMT, BIN_EXP,
				     (int)PERL_REVISION, (int)PERL_VERSION,
				     (int)PERL_SUBVERSION), PL_origargv);
#endif
	    Perl_croak(aTHX_ "Can't do setuid\n");
	}

	if (PL_statbuf.st_mode & S_ISGID && PL_statbuf.st_gid != PL_egid) {
#ifdef HAS_SETEGID
	    (void)setegid(PL_statbuf.st_gid);
#else
#ifdef HAS_SETREGID
           (void)setregid((Gid_t)-1,PL_statbuf.st_gid);
#else
#ifdef HAS_SETRESGID
           (void)setresgid((Gid_t)-1,PL_statbuf.st_gid,(Gid_t)-1);
#else
	    PerlProc_setgid(PL_statbuf.st_gid);
#endif
#endif
#endif
	    if (PerlProc_getegid() != PL_statbuf.st_gid)
		Perl_croak(aTHX_ "Can't do setegid!\n");
	}
	if (PL_statbuf.st_mode & S_ISUID) {
	    if (PL_statbuf.st_uid != PL_euid)
#ifdef HAS_SETEUID
		(void)seteuid(PL_statbuf.st_uid);	/* all that for this */
#else
#ifdef HAS_SETREUID
                (void)setreuid((Uid_t)-1,PL_statbuf.st_uid);
#else
#ifdef HAS_SETRESUID
                (void)setresuid((Uid_t)-1,PL_statbuf.st_uid,(Uid_t)-1);
#else
		PerlProc_setuid(PL_statbuf.st_uid);
#endif
#endif
#endif
	    if (PerlProc_geteuid() != PL_statbuf.st_uid)
		Perl_croak(aTHX_ "Can't do seteuid!\n");
	}
	else if (PL_uid) {			/* oops, mustn't run as root */
#ifdef HAS_SETEUID
          (void)seteuid((Uid_t)PL_uid);
#else
#ifdef HAS_SETREUID
          (void)setreuid((Uid_t)-1,(Uid_t)PL_uid);
#else
#ifdef HAS_SETRESUID
          (void)setresuid((Uid_t)-1,(Uid_t)PL_uid,(Uid_t)-1);
#else
          PerlProc_setuid((Uid_t)PL_uid);
#endif
#endif
#endif
	    if (PerlProc_geteuid() != PL_uid)
		Perl_croak(aTHX_ "Can't do seteuid!\n");
	}
	init_ids();
	if (!cando(S_IXUSR,TRUE,&PL_statbuf))
	    Perl_croak(aTHX_ "Permission denied\n");	/* they can't do this */
    }
#ifdef IAMSUID
    else if (PL_preprocess)
	Perl_croak(aTHX_ "-P not allowed for setuid/setgid script\n");
    else if (fdscript >= 0)
	Perl_croak(aTHX_ "fd script not allowed in suidperl\n");
    else
	Perl_croak(aTHX_ "Script is not setuid/setgid in suidperl\n");

    /* We absolutely must clear out any saved ids here, so we */
    /* exec the real perl, substituting fd script for scriptname. */
    /* (We pass script name as "subdir" of fd, which perl will grok.) */
    PerlIO_rewind(PL_rsfp);
    PerlLIO_lseek(PerlIO_fileno(PL_rsfp),(Off_t)0,0);  /* just in case rewind didn't */
    for (which = 1; PL_origargv[which] && PL_origargv[which] != scriptname; which++) ;
    if (!PL_origargv[which])
	Perl_croak(aTHX_ "Permission denied");
    PL_origargv[which] = savepv(Perl_form(aTHX_ "/dev/fd/%d/%s",
				  PerlIO_fileno(PL_rsfp), PL_origargv[which]));
#if defined(HAS_FCNTL) && defined(F_SETFD)
    fcntl(PerlIO_fileno(PL_rsfp),F_SETFD,0);	/* ensure no close-on-exec */
#endif
    PerlProc_execv(Perl_form(aTHX_ "%s/perl"PERL_FS_VER_FMT, BIN_EXP,
			     (int)PERL_REVISION, (int)PERL_VERSION,
			     (int)PERL_SUBVERSION), PL_origargv);/* try again */
    Perl_croak(aTHX_ "Can't do setuid\n");
#endif /* IAMSUID */
#else /* !DOSUID */
    if (PL_euid != PL_uid || PL_egid != PL_gid) {	/* (suidperl doesn't exist, in fact) */
#ifndef SETUID_SCRIPTS_ARE_SECURE_NOW
	dTHR;
	PerlLIO_fstat(PerlIO_fileno(PL_rsfp),&PL_statbuf);	/* may be either wrapped or real suid */
	if ((PL_euid != PL_uid && PL_euid == PL_statbuf.st_uid && PL_statbuf.st_mode & S_ISUID)
	    ||
	    (PL_egid != PL_gid && PL_egid == PL_statbuf.st_gid && PL_statbuf.st_mode & S_ISGID)
	   )
	    if (!PL_do_undump)
		Perl_croak(aTHX_ "YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET!\n\
FIX YOUR KERNEL, PUT A C WRAPPER AROUND THIS SCRIPT, OR USE -u AND UNDUMP!\n");
#endif /* SETUID_SCRIPTS_ARE_SECURE_NOW */
	/* not set-id, must be wrapped */
    }
#endif /* DOSUID */
}

STATIC void
S_find_beginning(pTHX)
{
    register char *s, *s2;

    /* skip forward in input to the real script? */

    forbid_setid("-x");
    while (PL_doextract) {
	if ((s = sv_gets(PL_linestr, PL_rsfp, 0)) == Nullch)
	    Perl_croak(aTHX_ "No Perl script found in input\n");
	if (*s == '#' && s[1] == '!' && (s = instr(s,"perl"))) {
	    PerlIO_ungetc(PL_rsfp, '\n');		/* to keep line count right */
	    PL_doextract = FALSE;
	    while (*s && !(isSPACE (*s) || *s == '#')) s++;
	    s2 = s;
	    while (*s == ' ' || *s == '\t') s++;
	    if (*s++ == '-') {
		while (isDIGIT(s2[-1]) || strchr("-._", s2[-1])) s2--;
		if (strnEQ(s2-4,"perl",4))
		    /*SUPPRESS 530*/
		    while (s = moreswitches(s)) ;
	    }
	}
    }
}


STATIC void
S_init_ids(pTHX)
{
    PL_uid = PerlProc_getuid();
    PL_euid = PerlProc_geteuid();
    PL_gid = PerlProc_getgid();
    PL_egid = PerlProc_getegid();
#ifdef VMS
    PL_uid |= PL_gid << 16;
    PL_euid |= PL_egid << 16;
#endif
    PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
}

STATIC void
S_forbid_setid(pTHX_ char *s)
{
    if (PL_euid != PL_uid)
        Perl_croak(aTHX_ "No %s allowed while running setuid", s);
    if (PL_egid != PL_gid)
        Perl_croak(aTHX_ "No %s allowed while running setgid", s);
}

void
Perl_init_debugger(pTHX)
{
    dTHR;
    HV *ostash = PL_curstash;

    PL_curstash = PL_debstash;
    PL_dbargs = GvAV(gv_AVadd((gv_fetchpv("args", GV_ADDMULTI, SVt_PVAV))));
    AvREAL_off(PL_dbargs);
    PL_DBgv = gv_fetchpv("DB", GV_ADDMULTI, SVt_PVGV);
    PL_DBline = gv_fetchpv("dbline", GV_ADDMULTI, SVt_PVAV);
    PL_DBsub = gv_HVadd(gv_fetchpv("sub", GV_ADDMULTI, SVt_PVHV));
    sv_upgrade(GvSV(PL_DBsub), SVt_IV);	/* IVX accessed if PERLDB_SUB_NN */
    PL_DBsingle = GvSV((gv_fetchpv("single", GV_ADDMULTI, SVt_PV)));
    sv_setiv(PL_DBsingle, 0); 
    PL_DBtrace = GvSV((gv_fetchpv("trace", GV_ADDMULTI, SVt_PV)));
    sv_setiv(PL_DBtrace, 0); 
    PL_DBsignal = GvSV((gv_fetchpv("signal", GV_ADDMULTI, SVt_PV)));
    sv_setiv(PL_DBsignal, 0); 
    PL_curstash = ostash;
}

#ifndef STRESS_REALLOC
#define REASONABLE(size) (size)
#else
#define REASONABLE(size) (1) /* unreasonable */
#endif

void
Perl_init_stacks(pTHX)
{
    /* start with 128-item stack and 8K cxstack */
    PL_curstackinfo = new_stackinfo(REASONABLE(128),
				 REASONABLE(8192/sizeof(PERL_CONTEXT) - 1));
    PL_curstackinfo->si_type = PERLSI_MAIN;
    PL_curstack = PL_curstackinfo->si_stack;
    PL_mainstack = PL_curstack;		/* remember in case we switch stacks */

    PL_stack_base = AvARRAY(PL_curstack);
    PL_stack_sp = PL_stack_base;
    PL_stack_max = PL_stack_base + AvMAX(PL_curstack);

    New(50,PL_tmps_stack,REASONABLE(128),SV*);
    PL_tmps_floor = -1;
    PL_tmps_ix = -1;
    PL_tmps_max = REASONABLE(128);

    New(54,PL_markstack,REASONABLE(32),I32);
    PL_markstack_ptr = PL_markstack;
    PL_markstack_max = PL_markstack + REASONABLE(32);

    SET_MARK_OFFSET;

    New(54,PL_scopestack,REASONABLE(32),I32);
    PL_scopestack_ix = 0;
    PL_scopestack_max = REASONABLE(32);

    New(54,PL_savestack,REASONABLE(128),ANY);
    PL_savestack_ix = 0;
    PL_savestack_max = REASONABLE(128);

    New(54,PL_retstack,REASONABLE(16),OP*);
    PL_retstack_ix = 0;
    PL_retstack_max = REASONABLE(16);
}

#undef REASONABLE

STATIC void
S_nuke_stacks(pTHX)
{
    dTHR;
    while (PL_curstackinfo->si_next)
	PL_curstackinfo = PL_curstackinfo->si_next;
    while (PL_curstackinfo) {
	PERL_SI *p = PL_curstackinfo->si_prev;
	/* curstackinfo->si_stack got nuked by sv_free_arenas() */
	Safefree(PL_curstackinfo->si_cxstack);
	Safefree(PL_curstackinfo);
	PL_curstackinfo = p;
    }
    Safefree(PL_tmps_stack);
    Safefree(PL_markstack);
    Safefree(PL_scopestack);
    Safefree(PL_savestack);
    Safefree(PL_retstack);
}

#ifndef PERL_OBJECT
static PerlIO *tmpfp;  /* moved outside init_lexer() because of UNICOS bug */
#endif

STATIC void
S_init_lexer(pTHX)
{
#ifdef PERL_OBJECT
	PerlIO *tmpfp;
#endif
    tmpfp = PL_rsfp;
    PL_rsfp = Nullfp;
    lex_start(PL_linestr);
    PL_rsfp = tmpfp;
    PL_subname = newSVpvn("main",4);
}

STATIC void
S_init_predump_symbols(pTHX)
{
    dTHR;
    GV *tmpgv;
    GV *othergv;
    IO *io;

    sv_setpvn(get_sv("\"", TRUE), " ", 1);
    PL_stdingv = gv_fetchpv("STDIN",TRUE, SVt_PVIO);
    GvMULTI_on(PL_stdingv);
    io = GvIOp(PL_stdingv);
    IoIFP(io) = PerlIO_stdin();
    tmpgv = gv_fetchpv("stdin",TRUE, SVt_PV);
    GvMULTI_on(tmpgv);
    GvIOp(tmpgv) = (IO*)SvREFCNT_inc(io);

    tmpgv = gv_fetchpv("STDOUT",TRUE, SVt_PVIO);
    GvMULTI_on(tmpgv);
    io = GvIOp(tmpgv);
    IoOFP(io) = IoIFP(io) = PerlIO_stdout();
    setdefout(tmpgv);
    tmpgv = gv_fetchpv("stdout",TRUE, SVt_PV);
    GvMULTI_on(tmpgv);
    GvIOp(tmpgv) = (IO*)SvREFCNT_inc(io);

    PL_stderrgv = gv_fetchpv("STDERR",TRUE, SVt_PVIO);
    GvMULTI_on(PL_stderrgv);
    io = GvIOp(PL_stderrgv);
    IoOFP(io) = IoIFP(io) = PerlIO_stderr();
    tmpgv = gv_fetchpv("stderr",TRUE, SVt_PV);
    GvMULTI_on(tmpgv);
    GvIOp(tmpgv) = (IO*)SvREFCNT_inc(io);

    PL_statname = NEWSV(66,0);		/* last filename we did stat on */

    if (!PL_osname)
	PL_osname = savepv(OSNAME);
}

STATIC void
S_init_postdump_symbols(pTHX_ register int argc, register char **argv, register char **env)
{
    dTHR;
    char *s;
    SV *sv;
    GV* tmpgv;

    argc--,argv++;	/* skip name of script */
    if (PL_doswitches) {
	for (; argc > 0 && **argv == '-'; argc--,argv++) {
	    if (!argv[0][1])
		break;
	    if (argv[0][1] == '-' && !argv[0][2]) {
		argc--,argv++;
		break;
	    }
	    if (s = strchr(argv[0], '=')) {
		*s++ = '\0';
		sv_setpv(GvSV(gv_fetchpv(argv[0]+1,TRUE, SVt_PV)),s);
	    }
	    else
		sv_setiv(GvSV(gv_fetchpv(argv[0]+1,TRUE, SVt_PV)),1);
	}
    }
    PL_toptarget = NEWSV(0,0);
    sv_upgrade(PL_toptarget, SVt_PVFM);
    sv_setpvn(PL_toptarget, "", 0);
    PL_bodytarget = NEWSV(0,0);
    sv_upgrade(PL_bodytarget, SVt_PVFM);
    sv_setpvn(PL_bodytarget, "", 0);
    PL_formtarget = PL_bodytarget;

    TAINT;
    if (tmpgv = gv_fetchpv("0",TRUE, SVt_PV)) {
	sv_setpv(GvSV(tmpgv),PL_origfilename);
	magicname("0", "0", 1);
    }
    if (tmpgv = gv_fetchpv("\030",TRUE, SVt_PV))
#ifdef OS2
	sv_setpv(GvSV(tmpgv), os2_execname());
#else
	sv_setpv(GvSV(tmpgv),PL_origargv[0]);
#endif
    if (PL_argvgv = gv_fetchpv("ARGV",TRUE, SVt_PVAV)) {
	GvMULTI_on(PL_argvgv);
	(void)gv_AVadd(PL_argvgv);
	av_clear(GvAVn(PL_argvgv));
	for (; argc > 0; argc--,argv++) {
	    av_push(GvAVn(PL_argvgv),newSVpv(argv[0],0));
	}
    }
    if (PL_envgv = gv_fetchpv("ENV",TRUE, SVt_PVHV)) {
	HV *hv;
	GvMULTI_on(PL_envgv);
	hv = GvHVn(PL_envgv);
	hv_magic(hv, PL_envgv, 'E');
#if !defined( VMS) && !defined(EPOC)  /* VMS doesn't have environ array */
	/* Note that if the supplied env parameter is actually a copy
	   of the global environ then it may now point to free'd memory
	   if the environment has been modified since. To avoid this
	   problem we treat env==NULL as meaning 'use the default'
	*/
	if (!env)
	    env = environ;
	if (env != environ)
	    environ[0] = Nullch;
	for (; *env; env++) {
	    if (!(s = strchr(*env,'=')))
		continue;
	    *s++ = '\0';
#if defined(MSDOS)
	    (void)strupr(*env);
#endif
	    sv = newSVpv(s--,0);
	    (void)hv_store(hv, *env, s - *env, sv, 0);
	    *s = '=';
#if defined(__BORLANDC__) && defined(USE_WIN32_RTL_ENV)
	    /* Sins of the RTL. See note in my_setenv(). */
	    (void)PerlEnv_putenv(savepv(*env));
#endif
	}
#endif
#ifdef DYNAMIC_ENV_FETCH
	HvNAME(hv) = savepv(ENV_HV_NAME);
#endif
    }
    TAINT_NOT;
    if (tmpgv = gv_fetchpv("$",TRUE, SVt_PV))
	sv_setiv(GvSV(tmpgv), (IV)PerlProc_getpid());
}

STATIC void
S_init_perllib(pTHX)
{
    char *s;
    if (!PL_tainting) {
#ifndef VMS
	s = PerlEnv_getenv("PERL5LIB");
	if (s)
	    incpush(s, TRUE);
	else
	    incpush(PerlEnv_getenv("PERLLIB"), FALSE);
#else /* VMS */
	/* Treat PERL5?LIB as a possible search list logical name -- the
	 * "natural" VMS idiom for a Unix path string.  We allow each
	 * element to be a set of |-separated directories for compatibility.
	 */
	char buf[256];
	int idx = 0;
	if (my_trnlnm("PERL5LIB",buf,0))
	    do { incpush(buf,TRUE); } while (my_trnlnm("PERL5LIB",buf,++idx));
	else
	    while (my_trnlnm("PERLLIB",buf,idx++)) incpush(buf,FALSE);
#endif /* VMS */
    }

/* Use the ~-expanded versions of APPLLIB (undocumented),
    ARCHLIB PRIVLIB SITEARCH and SITELIB 
*/
#ifdef APPLLIB_EXP
    incpush(APPLLIB_EXP, TRUE);
#endif

#ifdef ARCHLIB_EXP
    incpush(ARCHLIB_EXP, FALSE);
#endif
#ifndef PRIVLIB_EXP
#define PRIVLIB_EXP "/usr/local/lib/perl5:/usr/local/lib/perl"
#endif
#if defined(WIN32) 
    incpush(PRIVLIB_EXP, TRUE);
#else
    incpush(PRIVLIB_EXP, FALSE);
#endif

#ifdef SITEARCH_EXP
    incpush(SITEARCH_EXP, FALSE);
#endif
#ifdef SITELIB_EXP
#if defined(WIN32) 
    incpush(SITELIB_EXP, TRUE);
#else
    incpush(SITELIB_EXP, FALSE);
#endif
#endif
#if defined(PERL_VENDORLIB_EXP)
#if defined(WIN32) 
    incpush(PERL_VENDORLIB_EXP, TRUE);
#else
    incpush(PERL_VENDORLIB_EXP, FALSE);
#endif
#endif
    if (!PL_tainting)
	incpush(".", FALSE);
}

#if defined(DOSISH)
#    define PERLLIB_SEP ';'
#else
#  if defined(VMS)
#    define PERLLIB_SEP '|'
#  else
#    define PERLLIB_SEP ':'
#  endif
#endif
#ifndef PERLLIB_MANGLE
#  define PERLLIB_MANGLE(s,n) (s)
#endif 

STATIC void
S_incpush(pTHX_ char *p, int addsubdirs)
{
    SV *subdir = Nullsv;

    if (!p)
	return;

    if (addsubdirs) {
	subdir = sv_newmortal();
    }

    /* Break at all separators */
    while (p && *p) {
	SV *libdir = NEWSV(55,0);
	char *s;

	/* skip any consecutive separators */
	while ( *p == PERLLIB_SEP ) {
	    /* Uncomment the next line for PATH semantics */
	    /* av_push(GvAVn(PL_incgv), newSVpvn(".", 1)); */
	    p++;
	}

	if ( (s = strchr(p, PERLLIB_SEP)) != Nullch ) {
	    sv_setpvn(libdir, PERLLIB_MANGLE(p, (STRLEN)(s - p)),
		      (STRLEN)(s - p));
	    p = s + 1;
	}
	else {
	    sv_setpv(libdir, PERLLIB_MANGLE(p, 0));
	    p = Nullch;	/* break out */
	}

	/*
	 * BEFORE pushing libdir onto @INC we may first push version- and
	 * archname-specific sub-directories.
	 */
	if (addsubdirs) {
	    struct stat tmpstatbuf;
#ifdef VMS
	    char *unix;
	    STRLEN len;

	    if ((unix = tounixspec_ts(SvPV(libdir,len),Nullch)) != Nullch) {
		len = strlen(unix);
		while (unix[len-1] == '/') len--;  /* Cosmetic */
		sv_usepvn(libdir,unix,len);
	    }
	    else
		PerlIO_printf(Perl_error_log,
		              "Failed to unixify @INC element \"%s\"\n",
			      SvPV(libdir,len));
#endif
	    /* .../archname/version if -d .../archname/version/auto */
	    Perl_sv_setpvf(aTHX_ subdir, "%"SVf"/%s/"PERL_FS_VER_FMT"/auto", libdir,
			   ARCHNAME, (int)PERL_REVISION,
			   (int)PERL_VERSION, (int)PERL_SUBVERSION);
	    if (PerlLIO_stat(SvPVX(subdir), &tmpstatbuf) >= 0 &&
		  S_ISDIR(tmpstatbuf.st_mode))
		av_push(GvAVn(PL_incgv),
			newSVpvn(SvPVX(subdir), SvCUR(subdir) - sizeof "auto"));

	    /* .../archname if -d .../archname/auto */
	    Perl_sv_setpvf(aTHX_ subdir, "%"SVf"/%s/auto", libdir, ARCHNAME);
	    if (PerlLIO_stat(SvPVX(subdir), &tmpstatbuf) >= 0 &&
		  S_ISDIR(tmpstatbuf.st_mode))
		av_push(GvAVn(PL_incgv),
			newSVpvn(SvPVX(subdir), SvCUR(subdir) - sizeof "auto"));
	}

	/* finally push this lib directory on the end of @INC */
	av_push(GvAVn(PL_incgv), libdir);
    }
}

#ifdef USE_THREADS
STATIC struct perl_thread *
S_init_main_thread(pTHX)
{
#if !defined(PERL_IMPLICIT_CONTEXT)
    struct perl_thread *thr;
#endif
    XPV *xpv;

    Newz(53, thr, 1, struct perl_thread);
    PL_curcop = &PL_compiling;
    thr->interp = PERL_GET_INTERP;
    thr->cvcache = newHV();
    thr->threadsv = newAV();
    /* thr->threadsvp is set when find_threadsv is called */
    thr->specific = newAV();
    thr->flags = THRf_R_JOINABLE;
    MUTEX_INIT(&thr->mutex);
    /* Handcraft thrsv similarly to mess_sv */
    New(53, PL_thrsv, 1, SV);
    Newz(53, xpv, 1, XPV);
    SvFLAGS(PL_thrsv) = SVt_PV;
    SvANY(PL_thrsv) = (void*)xpv;
    SvREFCNT(PL_thrsv) = 1 << 30;	/* practically infinite */
    SvPVX(PL_thrsv) = (char*)thr;
    SvCUR_set(PL_thrsv, sizeof(thr));
    SvLEN_set(PL_thrsv, sizeof(thr));
    *SvEND(PL_thrsv) = '\0';	/* in the trailing_nul field */
    thr->oursv = PL_thrsv;
    PL_chopset = " \n-";
    PL_dumpindent = 4;

    MUTEX_LOCK(&PL_threads_mutex);
    PL_nthreads++;
    thr->tid = 0;
    thr->next = thr;
    thr->prev = thr;
    MUTEX_UNLOCK(&PL_threads_mutex);

#ifdef HAVE_THREAD_INTERN
    Perl_init_thread_intern(thr);
#endif

#ifdef SET_THREAD_SELF
    SET_THREAD_SELF(thr);
#else
    thr->self = pthread_self();
#endif /* SET_THREAD_SELF */
    SET_THR(thr);

    /*
     * These must come after the SET_THR because sv_setpvn does
     * SvTAINT and the taint fields require dTHR.
     */
    PL_toptarget = NEWSV(0,0);
    sv_upgrade(PL_toptarget, SVt_PVFM);
    sv_setpvn(PL_toptarget, "", 0);
    PL_bodytarget = NEWSV(0,0);
    sv_upgrade(PL_bodytarget, SVt_PVFM);
    sv_setpvn(PL_bodytarget, "", 0);
    PL_formtarget = PL_bodytarget;
    thr->errsv = newSVpvn("", 0);
    (void) find_threadsv("@");	/* Ensure $@ is initialised early */

    PL_maxscream = -1;
    PL_regcompp = MEMBER_TO_FPTR(Perl_pregcomp);
    PL_regexecp = MEMBER_TO_FPTR(Perl_regexec_flags);
    PL_regint_start = MEMBER_TO_FPTR(Perl_re_intuit_start);
    PL_regint_string = MEMBER_TO_FPTR(Perl_re_intuit_string);
    PL_regfree = MEMBER_TO_FPTR(Perl_pregfree);
    PL_regindent = 0;
    PL_reginterp_cnt = 0;

    return thr;
}
#endif /* USE_THREADS */

void
Perl_call_list(pTHX_ I32 oldscope, AV *paramList)
{
    dTHR;
    SV *atsv;
    line_t oldline = CopLINE(PL_curcop);
    CV *cv;
    STRLEN len;
    int ret;
    dJMPENV;

    while (AvFILL(paramList) >= 0) {
	cv = (CV*)av_shift(paramList);
	SAVEFREESV(cv);
	CALLPROTECT(aTHX_ pcur_env, &ret, MEMBER_TO_FPTR(S_call_list_body), cv);
	switch (ret) {
	case 0:
	    atsv = ERRSV;
	    (void)SvPV(atsv, len);
	    if (len) {
		STRLEN n_a;
		PL_curcop = &PL_compiling;
		CopLINE_set(PL_curcop, oldline);
		if (paramList == PL_beginav)
		    sv_catpv(atsv, "BEGIN failed--compilation aborted");
		else
		    Perl_sv_catpvf(aTHX_ atsv,
				   "%s failed--call queue aborted",
				   paramList == PL_checkav ? "CHECK"
				   : paramList == PL_initav ? "INIT"
				   : "END");
		while (PL_scopestack_ix > oldscope)
		    LEAVE;
		Perl_croak(aTHX_ "%s", SvPVx(atsv, n_a));
	    }
	    break;
	case 1:
	    STATUS_ALL_FAILURE;
	    /* FALL THROUGH */
	case 2:
	    /* my_exit() was called */
	    while (PL_scopestack_ix > oldscope)
		LEAVE;
	    FREETMPS;
	    PL_curstash = PL_defstash;
	    PL_curcop = &PL_compiling;
	    CopLINE_set(PL_curcop, oldline);
	    if (PL_statusvalue && !(PL_exit_flags & PERL_EXIT_EXPECTED)) {
		if (paramList == PL_beginav)
		    Perl_croak(aTHX_ "BEGIN failed--compilation aborted");
		else
		    Perl_croak(aTHX_ "%s failed--call queue aborted",
			       paramList == PL_checkav ? "CHECK"
			       : paramList == PL_initav ? "INIT"
			       : "END");
	    }
	    my_exit_jump();
	    /* NOTREACHED */
	case 3:
	    if (PL_restartop) {
		PL_curcop = &PL_compiling;
		CopLINE_set(PL_curcop, oldline);
		JMPENV_JUMP(3);
	    }
	    PerlIO_printf(Perl_error_log, "panic: restartop\n");
	    FREETMPS;
	    break;
	}
    }
}

STATIC void *
S_call_list_body(pTHX_ va_list args)
{
    dTHR;
    CV *cv = va_arg(args, CV*);

    PUSHMARK(PL_stack_sp);
    call_sv((SV*)cv, G_EVAL|G_DISCARD);
    return NULL;
}

void
Perl_my_exit(pTHX_ U32 status)
{
    dTHR;

    DEBUG_S(PerlIO_printf(Perl_debug_log, "my_exit: thread %p, status %lu\n",
			  thr, (unsigned long) status));
    switch (status) {
    case 0:
	STATUS_ALL_SUCCESS;
	break;
    case 1:
	STATUS_ALL_FAILURE;
	break;
    default:
	STATUS_NATIVE_SET(status);
	break;
    }
    my_exit_jump();
}

void
Perl_my_failure_exit(pTHX)
{
#ifdef VMS
    if (vaxc$errno & 1) {
	if (STATUS_NATIVE & 1)		/* fortuitiously includes "-1" */
	    STATUS_NATIVE_SET(44);
    }
    else {
	if (!vaxc$errno && errno)	/* unlikely */
	    STATUS_NATIVE_SET(44);
	else
	    STATUS_NATIVE_SET(vaxc$errno);
    }
#else
    int exitstatus;
    if (errno & 255)
	STATUS_POSIX_SET(errno);
    else {
	exitstatus = STATUS_POSIX >> 8; 
	if (exitstatus & 255)
	    STATUS_POSIX_SET(exitstatus);
	else
	    STATUS_POSIX_SET(255);
    }
#endif
    my_exit_jump();
}

STATIC void
S_my_exit_jump(pTHX)
{
    dTHR;
    register PERL_CONTEXT *cx;
    I32 gimme;
    SV **newsp;

    if (PL_e_script) {
	SvREFCNT_dec(PL_e_script);
	PL_e_script = Nullsv;
    }

    POPSTACK_TO(PL_mainstack);
    if (cxstack_ix >= 0) {
	if (cxstack_ix > 0)
	    dounwind(0);
	POPBLOCK(cx,PL_curpm);
	LEAVE;
    }

    JMPENV_JUMP(2);
}

#ifdef PERL_OBJECT
#include "XSUB.h"
#endif

static I32
read_e_script(pTHXo_ int idx, SV *buf_sv, int maxlen)
{
    char *p, *nl;
    p  = SvPVX(PL_e_script);
    nl = strchr(p, '\n');
    nl = (nl) ? nl+1 : SvEND(PL_e_script);
    if (nl-p == 0) {
	filter_del(read_e_script);
	return 0;
    }
    sv_catpvn(buf_sv, p, nl-p);
    sv_chop(PL_e_script, nl);
    return 1;
}