[perl5.git] / ext / DynaLoader / dl_aix.xs

/* dl_aix.xs
 *
 * Written: 8/31/94 by Wayne Scott (wscott@ichips.intel.com)
 *
 *  All I did was take Jens-Uwe Mager's libdl emulation library for
 *  AIX and merged it with the dl_dlopen.xs file to create a dynamic library
 *  package that works for AIX.
 *
 *  I did change all malloc's, free's, strdup's, calloc's to use the perl
 *  equilvant.  I also removed some stuff we will not need.  Call fini()
 *  on statup...   It can probably be trimmed more.
 */

/*
 * @(#)dlfcn.c	1.5 revision of 93/02/14  20:14:17
 * This is an unpublished work copyright (c) 1992 Helios Software GmbH
 * 3000 Hannover 1, Germany
 */
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ldr.h>
#include <a.out.h>
#include <ldfcn.h>

/*
 * AIX 4.3 does remove some useful definitions from ldfcn.h. Define
 * these here to compensate for that lossage.
 */
#ifndef BEGINNING
# define BEGINNING SEEK_SET
#endif
#ifndef FSEEK
# define FSEEK(ldptr,o,p)	fseek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr) +o):o,p)
#endif
#ifndef FREAD
# define FREAD(p,s,n,ldptr)	fread(p,s,n,IOPTR(ldptr))
#endif

/* If using PerlIO, redefine these macros from <ldfcn.h> */
#ifdef USE_PERLIO
#define FSEEK(ldptr,o,p)        PerlIO_seek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr)+o):o,p)
#define FREAD(p,s,n,ldptr)      PerlIO_read(IOPTR(ldptr),p,s*n)
#endif

/*
 * We simulate dlopen() et al. through a call to load. Because AIX has
 * no call to find an exported symbol we read the loader section of the
 * loaded module and build a list of exported symbols and their virtual
 * address.
 */

typedef struct {
	char		*name;		/* the symbols's name */
	void		*addr;		/* its relocated virtual address */
} Export, *ExportPtr;

/*
 * The void * handle returned from dlopen is actually a ModulePtr.
 */
typedef struct Module {
	struct Module	*next;
	char		*name;		/* module name for refcounting */
	int		refCnt;		/* the number of references */
	void		*entry;		/* entry point from load */
	int		nExports;	/* the number of exports found */
	ExportPtr	exports;	/* the array of exports */
} Module, *ModulePtr;

/*
 * We keep a list of all loaded modules to be able to call the fini
 * handlers at atexit() time.
 */
static ModulePtr modList;		/* XXX threaded */

/*
 * The last error from one of the dl* routines is kept in static
 * variables here. Each error is returned only once to the caller.
 */
static char errbuf[BUFSIZ];		/* XXX threaded */
static int errvalid;			/* XXX threaded */

static void caterr(char *);
static int readExports(ModulePtr);
static void terminate(void);

static char *strerror_failed   = "(strerror failed)";
static char *strerror_r_failed = "(strerror_r failed)";

char *strerrorcat(char *str, int err) {
    int strsiz = strlen(str);
    int msgsiz;
    char *msg;

#ifdef USE_THREADS
    char *buf = malloc(BUFSIZ);

    if (buf == 0)
      return 0;
    if (strerror_r(err, buf, BUFSIZ) == 0)
      msg = buf;
    else
      msg = strerror_r_failed;
    msgsiz = strlen(msg);
    if (strsiz + msgsiz < BUFSIZ)
      strcat(str, msg);
    free(buf);
#else
    if ((msg = strerror(err)) == 0)
      msg = strerror_failed;
    msgsiz = strlen(msg);		/* Note msg = buf and free() above. */
    if (strsiz + msgsiz < BUFSIZ)	/* Do not move this after #endif. */
      strcat(str, msg);
#endif

    return str;
}

char *strerrorcpy(char *str, int err) {
    int msgsiz;
    char *msg;

#ifdef USE_THREADS
    char *buf = malloc(BUFSIZ);

    if (buf == 0)
      return 0;
    if (strerror_r(err, buf, BUFSIZ) == 0)
      msg = buf;
    else
      msg = strerror_r_failed;
    msgsiz = strlen(msg);
    if (msgsiz < BUFSIZ)
      strcpy(str, msg);
    free(buf);
#else
    if ((msg = strerror(err)) == 0)
      msg = strerror_failed;
    msgsiz = strlen(msg);	/* Note msg = buf and free() above. */
    if (msgsiz < BUFSIZ)	/* Do not move this after #endif. */
      strcpy(str, msg);
#endif

    return str;
}
  
/* ARGSUSED */
void *dlopen(char *path, int mode)
{
	dTHX;
	register ModulePtr mp;
	static int inited;			/* XXX threaded */

	/*
	 * Upon the first call register a terminate handler that will
	 * close all libraries.
	 */
	if (!inited) {
		inited++;
		atexit(terminate);
	}
	/*
	 * Scan the list of modules if have the module already loaded.
	 */
	for (mp = modList; mp; mp = mp->next)
		if (strcmp(mp->name, path) == 0) {
			mp->refCnt++;
			return mp;
		}
	Newz(1000,mp,1,Module);
	if (mp == NULL) {
		errvalid++;
		strcpy(errbuf, "Newz: ");
		strerrorcat(errbuf, errno);
		return NULL;
	}
	
	if ((mp->name = savepv(path)) == NULL) {
		errvalid++;
		strcpy(errbuf, "savepv: ");
		strerrorcat(errbuf, errno);
		safefree(mp);
		return NULL;
	}

	/*
	 * load should be declared load(const char *...). Thus we
	 * cast the path to a normal char *. Ugly.
	 */
	if ((mp->entry = (void *)load((char *)path,
#ifdef L_LIBPATH_EXEC
				      L_LIBPATH_EXEC |
#endif
				      L_NOAUTODEFER,
				      NULL)) == NULL) {
	        int saverrno = errno;
		
		safefree(mp->name);
		safefree(mp);
		errvalid++;
		strcpy(errbuf, "dlopen: ");
		strcat(errbuf, path);
		strcat(errbuf, ": ");
		/*
		 * If AIX says the file is not executable, the error
		 * can be further described by querying the loader about
		 * the last error.
		 */
		if (saverrno == ENOEXEC) {
			char *moreinfo[BUFSIZ/sizeof(char *)];
			if (loadquery(L_GETMESSAGES, moreinfo, sizeof(moreinfo)) == -1)
				strerrorcpy(errbuf, saverrno);
			else {
				char **p;
				for (p = moreinfo; *p; p++)
					caterr(*p);
			}
		} else
			strerrorcat(errbuf, saverrno);
		return NULL;
	}
	mp->refCnt = 1;
	mp->next = modList;
	modList = mp;
	/*
	 * Assume anonymous exports come from the module this dlopen
	 * is linked into, that holds true as long as dlopen and all
	 * of the perl core are in the same shared object.
	 */
	if (loadbind(0, (void *)dlopen, mp->entry) == -1) {
	        int saverrno = errno;

		dlclose(mp);
		errvalid++;
		strcpy(errbuf, "loadbind: ");
		strerrorcat(errbuf, saverrno);
		return NULL;
	}
	if (readExports(mp) == -1) {
		dlclose(mp);
		return NULL;
	}
	return mp;
}

/*
 * Attempt to decipher an AIX loader error message and append it
 * to our static error message buffer.
 */
static void caterr(char *s)
{
	register char *p = s;

	while (*p >= '0' && *p <= '9')
		p++;
	switch(atoi(s)) {
	case L_ERROR_TOOMANY:
		strcat(errbuf, "to many errors");
		break;
	case L_ERROR_NOLIB:
		strcat(errbuf, "can't load library");
		strcat(errbuf, p);
		break;
	case L_ERROR_UNDEF:
		strcat(errbuf, "can't find symbol");
		strcat(errbuf, p);
		break;
	case L_ERROR_RLDBAD:
		strcat(errbuf, "bad RLD");
		strcat(errbuf, p);
		break;
	case L_ERROR_FORMAT:
		strcat(errbuf, "bad exec format in");
		strcat(errbuf, p);
		break;
	case L_ERROR_ERRNO:
		strerrorcat(errbuf, atoi(++p));
		break;
	default:
		strcat(errbuf, s);
		break;
	}
}

void *dlsym(void *handle, const char *symbol)
{
	register ModulePtr mp = (ModulePtr)handle;
	register ExportPtr ep;
	register int i;

	/*
	 * Could speed up search, but I assume that one assigns
	 * the result to function pointers anyways.
	 */
	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
		if (strcmp(ep->name, symbol) == 0)
			return ep->addr;
	errvalid++;
	strcpy(errbuf, "dlsym: undefined symbol ");
	strcat(errbuf, symbol);
	return NULL;
}

char *dlerror(void)
{
	if (errvalid) {
		errvalid = 0;
		return errbuf;
	}
	return NULL;
}

int dlclose(void *handle)
{
	register ModulePtr mp = (ModulePtr)handle;
	int result;
	register ModulePtr mp1;

	if (--mp->refCnt > 0)
		return 0;
	result = unload(mp->entry);
	if (result == -1) {
		errvalid++;
		strerrorcpy(errbuf, errno);
	}
	if (mp->exports) {
		register ExportPtr ep;
		register int i;
		for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
			if (ep->name)
				safefree(ep->name);
		safefree(mp->exports);
	}
	if (mp == modList)
		modList = mp->next;
	else {
		for (mp1 = modList; mp1; mp1 = mp1->next)
			if (mp1->next == mp) {
				mp1->next = mp->next;
				break;
			}
	}
	safefree(mp->name);
	safefree(mp);
	return result;
}

static void terminate(void)
{
	while (modList)
		dlclose(modList);
}

/* Added by Wayne Scott 
 * This is needed because the ldopen system call calls
 * calloc to allocated a block of date.  The ldclose call calls free.
 * Without this we get this system calloc and perl's free, resulting
 * in a "Bad free" message.  This way we always use perl's malloc.
 */
void *calloc(size_t ne, size_t sz) 
{
  void *out;

  out = (void *) safemalloc(ne*sz);
  memzero(out, ne*sz);
  return(out);
}
 
/*
 * Build the export table from the XCOFF .loader section.
 */
static int readExports(ModulePtr mp)
{
	dTHX;
	LDFILE *ldp = NULL;
	SCNHDR sh;
	LDHDR *lhp;
	char *ldbuf;
	LDSYM *ls;
	int i;
	ExportPtr ep;

	if ((ldp = ldopen(mp->name, ldp)) == NULL) {
		struct ld_info *lp;
		char *buf;
		int size = 4*1024;
		if (errno != ENOENT) {
			errvalid++;
			strcpy(errbuf, "readExports: ");
			strerrorcat(errbuf, errno);
			return -1;
		}
		/*
		 * The module might be loaded due to the LIBPATH
		 * environment variable. Search for the loaded
		 * module using L_GETINFO.
		 */
		if ((buf = safemalloc(size)) == NULL) {
			errvalid++;
			strcpy(errbuf, "readExports: ");
			strerrorcat(errbuf, errno);
			return -1;
		}
		while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
			safefree(buf);
			size += 4*1024;
			if ((buf = safemalloc(size)) == NULL) {
				errvalid++;
				strcpy(errbuf, "readExports: ");
				strerrorcat(errbuf, errno);
				return -1;
			}
		}
		if (i == -1) {
			errvalid++;
			strcpy(errbuf, "readExports: ");
			strerrorcat(errbuf, errno);
			safefree(buf);
			return -1;
		}
		/*
		 * Traverse the list of loaded modules. The entry point
		 * returned by load() does actually point to the data
		 * segment origin.
		 */
		lp = (struct ld_info *)buf;
		while (lp) {
			if (lp->ldinfo_dataorg == mp->entry) {
				ldp = ldopen(lp->ldinfo_filename, ldp);
				break;
			}
			if (lp->ldinfo_next == 0)
				lp = NULL;
			else
				lp = (struct ld_info *)((char *)lp + lp->ldinfo_next);
		}
		safefree(buf);
		if (!ldp) {
			errvalid++;
			strcpy(errbuf, "readExports: ");
			strerrorcat(errbuf, errno);
			return -1;
		}
	}
	if (TYPE(ldp) != U802TOCMAGIC) {
		errvalid++;
		strcpy(errbuf, "readExports: bad magic");
		while(ldclose(ldp) == FAILURE)
			;
		return -1;
	}
	if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
		errvalid++;
		strcpy(errbuf, "readExports: cannot read loader section header");
		while(ldclose(ldp) == FAILURE)
			;
		return -1;
	}
	/*
	 * We read the complete loader section in one chunk, this makes
	 * finding long symbol names residing in the string table easier.
	 */
	if ((ldbuf = (char *)safemalloc(sh.s_size)) == NULL) {
		errvalid++;
		strcpy(errbuf, "readExports: ");
		strerrorcat(errbuf, errno);
		while(ldclose(ldp) == FAILURE)
			;
		return -1;
	}
	if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
		errvalid++;
		strcpy(errbuf, "readExports: cannot seek to loader section");
		safefree(ldbuf);
		while(ldclose(ldp) == FAILURE)
			;
		return -1;
	}
/* This first case is a hack, since it assumes that the 3rd parameter to
   FREAD is 1. See the redefinition of FREAD above to see how this works. */
#ifdef USE_PERLIO
	if (FREAD(ldbuf, sh.s_size, 1, ldp) != sh.s_size) {
#else
	if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
#endif
		errvalid++;
		strcpy(errbuf, "readExports: cannot read loader section");
		safefree(ldbuf);
		while(ldclose(ldp) == FAILURE)
			;
		return -1;
	}
	lhp = (LDHDR *)ldbuf;
	ls = (LDSYM *)(ldbuf+LDHDRSZ);
	/*
	 * Count the number of exports to include in our export table.
	 */
	for (i = lhp->l_nsyms; i; i--, ls++) {
		if (!LDR_EXPORT(*ls))
			continue;
		mp->nExports++;
	}
	Newz(1001, mp->exports, mp->nExports, Export);
	if (mp->exports == NULL) {
		errvalid++;
		strcpy(errbuf, "readExports: ");
		strerrorcat(errbuf, errno);
		safefree(ldbuf);
		while(ldclose(ldp) == FAILURE)
			;
		return -1;
	}
	/*
	 * Fill in the export table. All entries are relative to
	 * the entry point we got from load.
	 */
	ep = mp->exports;
	ls = (LDSYM *)(ldbuf+LDHDRSZ);
	for (i = lhp->l_nsyms; i; i--, ls++) {
		char *symname;
		if (!LDR_EXPORT(*ls))
			continue;
		if (ls->l_zeroes == 0)
			symname = ls->l_offset+lhp->l_stoff+ldbuf;
		else
			symname = ls->l_name;
		ep->name = savepv(symname);
		ep->addr = (void *)((unsigned long)mp->entry + ls->l_value);
		ep++;
	}
	safefree(ldbuf);
	while(ldclose(ldp) == FAILURE)
		;
	return 0;
}

/* dl_dlopen.xs
 * 
 * Platform:	SunOS/Solaris, possibly others which use dlopen.
 * Author:	Paul Marquess (pmarquess@bfsec.bt.co.uk)
 * Created:	10th July 1994
 *
 * Modified:
 * 15th July 1994   - Added code to explicitly save any error messages.
 * 3rd August 1994  - Upgraded to v3 spec.
 * 9th August 1994  - Changed to use IV
 * 10th August 1994 - Tim Bunce: Added RTLD_LAZY, switchable debugging,
 *                    basic FreeBSD support, removed ClearError
 *
 */

/* Porting notes:

	see dl_dlopen.xs

*/

#include "dlutils.c"	/* SaveError() etc	*/


static void
dl_private_init(pTHX)
{
    (void)dl_generic_private_init(aTHX);
}
 
MODULE = DynaLoader     PACKAGE = DynaLoader

BOOT:
    (void)dl_private_init(aTHX);


void *
dl_load_file(filename, flags=0)
	char *	filename
	int	flags
	CODE:
	DLDEBUG(1,PerlIO_printf(PerlIO_stderr(), "dl_load_file(%s,%x):\n", filename,flags));
	if (flags & 0x01)
	    Perl_warn(aTHX_ "Can't make loaded symbols global on this platform while loading %s",filename);
	RETVAL = dlopen(filename, 1) ;
	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " libref=%x\n", RETVAL));
	ST(0) = sv_newmortal() ;
	if (RETVAL == NULL)
	    SaveError(aTHX_ "%s",dlerror()) ;
	else
	    sv_setiv( ST(0), (IV)RETVAL);


void *
dl_find_symbol(libhandle, symbolname)
	void *		libhandle
	char *		symbolname
	CODE:
	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_find_symbol(handle=%x, symbol=%s)\n",
		libhandle, symbolname));
	RETVAL = dlsym(libhandle, symbolname);
	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "  symbolref = %x\n", RETVAL));
	ST(0) = sv_newmortal() ;
	if (RETVAL == NULL)
	    SaveError(aTHX_ "%s",dlerror()) ;
	else
	    sv_setiv( ST(0), (IV)RETVAL);


void
dl_undef_symbols()
	PPCODE:


# These functions should not need changing on any platform:

void
dl_install_xsub(perl_name, symref, filename="$Package")
    char *	perl_name
    void *	symref 
    char *	filename
    CODE:
    DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_install_xsub(name=%s, symref=%x)\n",
	perl_name, symref));
    ST(0) = sv_2mortal(newRV((SV*)newXS(perl_name,
					(void(*)(pTHX_ CV *))symref,
					filename)));


char *
dl_error()
    CODE:
    RETVAL = LastError ;
    OUTPUT:
    RETVAL

# end.
Commit	Line	Data
a0d0e21e LW	1	/* dl_aix.xs
	2	*
	3	* Written: 8/31/94 by Wayne Scott (wscott@ichips.intel.com)
	4	*
	5	* All I did was take Jens-Uwe Mager's libdl emulation library for
	6	* AIX and merged it with the dl_dlopen.xs file to create a dynamic library
	7	* package that works for AIX.
	8	*
	9	* I did change all malloc's, free's, strdup's, calloc's to use the perl
	10	* equilvant. I also removed some stuff we will not need. Call fini()
	11	* on statup... It can probably be trimmed more.
	12	*/
	13
	14	/*
	15	* @(#)dlfcn.c 1.5 revision of 93/02/14 20:14:17
	16	* This is an unpublished work copyright (c) 1992 Helios Software GmbH
	17	* 3000 Hannover 1, Germany
	18	*/
	19	#include "EXTERN.h"
	20	#include "perl.h"
	21	#include "XSUB.h"
	22
	23	#include <stdio.h>
	24	#include <errno.h>
	25	#include <string.h>
	26	#include <stdlib.h>
	27	#include <sys/types.h>
	28	#include <sys/ldr.h>
	29	#include <a.out.h>
	30	#include <ldfcn.h>
	31
ee580363 GS	32	/*
	33	* AIX 4.3 does remove some useful definitions from ldfcn.h. Define
	34	* these here to compensate for that lossage.
	35	*/
	36	#ifndef BEGINNING
	37	# define BEGINNING SEEK_SET
	38	#endif
	39	#ifndef FSEEK
	40	# define FSEEK(ldptr,o,p) fseek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr) +o):o,p)
	41	#endif
	42	#ifndef FREAD
	43	# define FREAD(p,s,n,ldptr) fread(p,s,n,IOPTR(ldptr))
	44	#endif
	45
1553ab04 TB	46	/* If using PerlIO, redefine these macros from <ldfcn.h> */
	47	#ifdef USE_PERLIO
	48	#define FSEEK(ldptr,o,p) PerlIO_seek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr)+o):o,p)
	49	#define FREAD(p,s,n,ldptr) PerlIO_read(IOPTR(ldptr),p,s*n)
	50	#endif
	51
a0d0e21e LW	52	/*
	53	* We simulate dlopen() et al. through a call to load. Because AIX has
	54	* no call to find an exported symbol we read the loader section of the
	55	* loaded module and build a list of exported symbols and their virtual
	56	* address.
	57	*/
	58
	59	typedef struct {
	60	char name; / the symbols's name */
	61	void addr; / its relocated virtual address */
	62	} Export, *ExportPtr;
	63
	64	/*
	65	* The void * handle returned from dlopen is actually a ModulePtr.
	66	*/
	67	typedef struct Module {
	68	struct Module *next;
	69	char name; / module name for refcounting */
	70	int refCnt; /* the number of references */
	71	void entry; / entry point from load */
	72	int nExports; /* the number of exports found */
	73	ExportPtr exports; /* the array of exports */
	74	} Module, *ModulePtr;
	75
	76	/*
	77	* We keep a list of all loaded modules to be able to call the fini
	78	* handlers at atexit() time.
	79	*/
549a6b10	80	static ModulePtr modList; /* XXX threaded */
a0d0e21e LW	81
	82	/*
	83	* The last error from one of the dl* routines is kept in static
	84	* variables here. Each error is returned only once to the caller.
	85	*/
549a6b10 JH	86	static char errbuf[BUFSIZ]; /* XXX threaded */
549a6b10 JH	87	static int errvalid; /* XXX threaded */
a0d0e21e LW	88
	89	static void caterr(char *);
	90	static int readExports(ModulePtr);
	91	static void terminate(void);
a0d0e21e	92
ce637636 JH	93	static char *strerror_failed = "(strerror failed)";
	94	static char *strerror_r_failed = "(strerror_r failed)";
	95
fd206186	96	char strerrorcat(char str, int err) {
ce637636 JH	97	int strsiz = strlen(str);
	98	int msgsiz;
	99	char *msg;
	100
	101	#ifdef USE_THREADS
	102	char *buf = malloc(BUFSIZ);
	103
	104	if (buf == 0)
	105	return 0;
549a6b10	106	if (strerror_r(err, buf, BUFSIZ) == 0)
ce637636 JH	107	msg = buf;
	108	else
	109	msg = strerror_r_failed;
	110	msgsiz = strlen(msg);
	111	if (strsiz + msgsiz < BUFSIZ)
	112	strcat(str, msg);
	113	free(buf);
	114	#else
	115	if ((msg = strerror(err)) == 0)
	116	msg = strerror_failed;
	117	msgsiz = strlen(msg); /* Note msg = buf and free() above. */
	118	if (strsiz + msgsiz < BUFSIZ) /* Do not move this after #endif. */
	119	strcat(str, msg);
	120	#endif
	121
fd206186 JH	122	return str;
fd206186 JH	123	}
ce637636	124
fd206186	125	char strerrorcpy(char str, int err) {
ce637636 JH	126	int msgsiz;
	127	char *msg;
	128
	129	#ifdef USE_THREADS
	130	char *buf = malloc(BUFSIZ);
	131
	132	if (buf == 0)
	133	return 0;
549a6b10	134	if (strerror_r(err, buf, BUFSIZ) == 0)
ce637636 JH	135	msg = buf;
	136	else
	137	msg = strerror_r_failed;
	138	msgsiz = strlen(msg);
	139	if (msgsiz < BUFSIZ)
	140	strcpy(str, msg);
	141	free(buf);
	142	#else
	143	if ((msg = strerror(err)) == 0)
	144	msg = strerror_failed;
	145	msgsiz = strlen(msg); /* Note msg = buf and free() above. */
	146	if (msgsiz < BUFSIZ) /* Do not move this after #endif. */
	147	strcpy(str, msg);
	148	#endif
	149
fd206186 JH	150	return str;
fd206186 JH	151	}
a0d0e21e LW	152
	153	/* ARGSUSED */
	154	void dlopen(char path, int mode)
	155	{
5b877257	156	dTHX;
a0d0e21e	157	register ModulePtr mp;
549a6b10	158	static int inited; /* XXX threaded */
a0d0e21e LW	159
	160	/*
	161	* Upon the first call register a terminate handler that will
f6b3007c	162	* close all libraries.
a0d0e21e	163	*/
f6b3007c JH	164	if (!inited) {
f6b3007c JH	165	inited++;
a0d0e21e LW	166	atexit(terminate);
	167	}
	168	/*
	169	* Scan the list of modules if have the module already loaded.
	170	*/
	171	for (mp = modList; mp; mp = mp->next)
	172	if (strcmp(mp->name, path) == 0) {
	173	mp->refCnt++;
	174	return mp;
	175	}
	176	Newz(1000,mp,1,Module);
	177	if (mp == NULL) {
	178	errvalid++;
	179	strcpy(errbuf, "Newz: ");
fd206186	180	strerrorcat(errbuf, errno);
a0d0e21e LW	181	return NULL;
	182	}
	183
	184	if ((mp->name = savepv(path)) == NULL) {
	185	errvalid++;
	186	strcpy(errbuf, "savepv: ");
fd206186	187	strerrorcat(errbuf, errno);
a0d0e21e LW	188	safefree(mp);
	189	return NULL;
	190	}
549a6b10	191
a0d0e21e LW	192	/*
	193	* load should be declared load(const char *...). Thus we
	194	* cast the path to a normal char *. Ugly.
	195	*/
549a6b10 JH	196	if ((mp->entry = (void )load((char )path,
	197	#ifdef L_LIBPATH_EXEC
	198	L_LIBPATH_EXEC \|
	199	#endif
	200	L_NOAUTODEFER,
	201	NULL)) == NULL) {
	202	int saverrno = errno;
	203
a0d0e21e LW	204	safefree(mp->name);
	205	safefree(mp);
	206	errvalid++;
	207	strcpy(errbuf, "dlopen: ");
	208	strcat(errbuf, path);
	209	strcat(errbuf, ": ");
	210	/*
	211	* If AIX says the file is not executable, the error
	212	* can be further described by querying the loader about
	213	* the last error.
	214	*/
549a6b10 JH	215	if (saverrno == ENOEXEC) {
	216	char moreinfo[BUFSIZ/sizeof(char )];
	217	if (loadquery(L_GETMESSAGES, moreinfo, sizeof(moreinfo)) == -1)
	218	strerrorcpy(errbuf, saverrno);
a0d0e21e LW	219	else {
a0d0e21e LW	220	char **p;
549a6b10	221	for (p = moreinfo; *p; p++)
a0d0e21e LW	222	caterr(*p);
	223	}
	224	} else
549a6b10	225	strerrorcat(errbuf, saverrno);
a0d0e21e LW	226	return NULL;
	227	}
	228	mp->refCnt = 1;
	229	mp->next = modList;
	230	modList = mp;
f6b3007c JH	231	/*
	232	* Assume anonymous exports come from the module this dlopen
	233	* is linked into, that holds true as long as dlopen and all
	234	* of the perl core are in the same shared object.
	235	*/
	236	if (loadbind(0, (void *)dlopen, mp->entry) == -1) {
549a6b10 JH	237	int saverrno = errno;
549a6b10 JH	238
a0d0e21e LW	239	dlclose(mp);
	240	errvalid++;
	241	strcpy(errbuf, "loadbind: ");
549a6b10	242	strerrorcat(errbuf, saverrno);
a0d0e21e LW	243	return NULL;
	244	}
	245	if (readExports(mp) == -1) {
	246	dlclose(mp);
	247	return NULL;
	248	}
	249	return mp;
	250	}
	251
	252	/*
	253	* Attempt to decipher an AIX loader error message and append it
	254	* to our static error message buffer.
	255	*/
	256	static void caterr(char *s)
	257	{
	258	register char *p = s;
	259
	260	while (p >= '0' && p <= '9')
	261	p++;
	262	switch(atoi(s)) {
	263	case L_ERROR_TOOMANY:
	264	strcat(errbuf, "to many errors");
	265	break;
	266	case L_ERROR_NOLIB:
	267	strcat(errbuf, "can't load library");
	268	strcat(errbuf, p);
	269	break;
	270	case L_ERROR_UNDEF:
	271	strcat(errbuf, "can't find symbol");
	272	strcat(errbuf, p);
	273	break;
	274	case L_ERROR_RLDBAD:
	275	strcat(errbuf, "bad RLD");
	276	strcat(errbuf, p);
	277	break;
	278	case L_ERROR_FORMAT:
	279	strcat(errbuf, "bad exec format in");
	280	strcat(errbuf, p);
	281	break;
	282	case L_ERROR_ERRNO:
fd206186	283	strerrorcat(errbuf, atoi(++p));
a0d0e21e LW	284	break;
	285	default:
	286	strcat(errbuf, s);
	287	break;
	288	}
	289	}
	290
	291	void dlsym(void handle, const char *symbol)
	292	{
	293	register ModulePtr mp = (ModulePtr)handle;
	294	register ExportPtr ep;
	295	register int i;
	296
	297	/*
	298	* Could speed up search, but I assume that one assigns
	299	* the result to function pointers anyways.
	300	*/
	301	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
	302	if (strcmp(ep->name, symbol) == 0)
	303	return ep->addr;
	304	errvalid++;
	305	strcpy(errbuf, "dlsym: undefined symbol ");
	306	strcat(errbuf, symbol);
	307	return NULL;
	308	}
	309
	310	char *dlerror(void)
	311	{
	312	if (errvalid) {
	313	errvalid = 0;
	314	return errbuf;
	315	}
	316	return NULL;
	317	}
	318
	319	int dlclose(void *handle)
	320	{
	321	register ModulePtr mp = (ModulePtr)handle;
	322	int result;
	323	register ModulePtr mp1;
	324
	325	if (--mp->refCnt > 0)
	326	return 0;
	327	result = unload(mp->entry);
	328	if (result == -1) {
	329	errvalid++;
fd206186	330	strerrorcpy(errbuf, errno);
a0d0e21e LW	331	}
	332	if (mp->exports) {
	333	register ExportPtr ep;
	334	register int i;
	335	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
	336	if (ep->name)
	337	safefree(ep->name);
	338	safefree(mp->exports);
	339	}
	340	if (mp == modList)
	341	modList = mp->next;
	342	else {
	343	for (mp1 = modList; mp1; mp1 = mp1->next)
	344	if (mp1->next == mp) {
	345	mp1->next = mp->next;
	346	break;
	347	}
	348	}
	349	safefree(mp->name);
	350	safefree(mp);
	351	return result;
	352	}
	353
	354	static void terminate(void)
	355	{
	356	while (modList)
	357	dlclose(modList);
	358	}
	359
	360	/* Added by Wayne Scott
	361	* This is needed because the ldopen system call calls
	362	* calloc to allocated a block of date. The ldclose call calls free.
	363	* Without this we get this system calloc and perl's free, resulting
	364	* in a "Bad free" message. This way we always use perl's malloc.
	365	*/
	366	void *calloc(size_t ne, size_t sz)
	367	{
	368	void *out;
	369
	370	out = (void ) safemalloc(nesz);
	371	memzero(out, ne*sz);
	372	return(out);
	373	}
	374
	375	/*
	376	* Build the export table from the XCOFF .loader section.
	377	*/
	378	static int readExports(ModulePtr mp)
	379	{
5b877257	380	dTHX;
a0d0e21e LW	381	LDFILE *ldp = NULL;
	382	SCNHDR sh;
	383	LDHDR *lhp;
	384	char *ldbuf;
	385	LDSYM *ls;
	386	int i;
	387	ExportPtr ep;
	388
	389	if ((ldp = ldopen(mp->name, ldp)) == NULL) {
	390	struct ld_info *lp;
	391	char *buf;
	392	int size = 4*1024;
	393	if (errno != ENOENT) {
	394	errvalid++;
	395	strcpy(errbuf, "readExports: ");
fd206186	396	strerrorcat(errbuf, errno);
a0d0e21e LW	397	return -1;
	398	}
	399	/*
	400	* The module might be loaded due to the LIBPATH
	401	* environment variable. Search for the loaded
	402	* module using L_GETINFO.
	403	*/
	404	if ((buf = safemalloc(size)) == NULL) {
	405	errvalid++;
	406	strcpy(errbuf, "readExports: ");
fd206186	407	strerrorcat(errbuf, errno);
a0d0e21e LW	408	return -1;
	409	}
	410	while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
	411	safefree(buf);
	412	size += 4*1024;
	413	if ((buf = safemalloc(size)) == NULL) {
	414	errvalid++;
	415	strcpy(errbuf, "readExports: ");
fd206186	416	strerrorcat(errbuf, errno);
a0d0e21e LW	417	return -1;
	418	}
	419	}
	420	if (i == -1) {
	421	errvalid++;
	422	strcpy(errbuf, "readExports: ");
fd206186	423	strerrorcat(errbuf, errno);
a0d0e21e LW	424	safefree(buf);
	425	return -1;
	426	}
	427	/*
	428	* Traverse the list of loaded modules. The entry point
	429	* returned by load() does actually point to the data
	430	* segment origin.
	431	*/
	432	lp = (struct ld_info *)buf;
	433	while (lp) {
	434	if (lp->ldinfo_dataorg == mp->entry) {
	435	ldp = ldopen(lp->ldinfo_filename, ldp);
	436	break;
	437	}
	438	if (lp->ldinfo_next == 0)
	439	lp = NULL;
	440	else
	441	lp = (struct ld_info )((char )lp + lp->ldinfo_next);
	442	}
	443	safefree(buf);
	444	if (!ldp) {
	445	errvalid++;
	446	strcpy(errbuf, "readExports: ");
fd206186	447	strerrorcat(errbuf, errno);
a0d0e21e LW	448	return -1;
	449	}
	450	}
	451	if (TYPE(ldp) != U802TOCMAGIC) {
	452	errvalid++;
	453	strcpy(errbuf, "readExports: bad magic");
	454	while(ldclose(ldp) == FAILURE)
	455	;
	456	return -1;
	457	}
	458	if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
	459	errvalid++;
	460	strcpy(errbuf, "readExports: cannot read loader section header");
	461	while(ldclose(ldp) == FAILURE)
	462	;
	463	return -1;
	464	}
	465	/*
	466	* We read the complete loader section in one chunk, this makes
	467	* finding long symbol names residing in the string table easier.
	468	*/
	469	if ((ldbuf = (char *)safemalloc(sh.s_size)) == NULL) {
	470	errvalid++;
	471	strcpy(errbuf, "readExports: ");
fd206186	472	strerrorcat(errbuf, errno);
a0d0e21e LW	473	while(ldclose(ldp) == FAILURE)
	474	;
	475	return -1;
	476	}
	477	if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
	478	errvalid++;
	479	strcpy(errbuf, "readExports: cannot seek to loader section");
	480	safefree(ldbuf);
	481	while(ldclose(ldp) == FAILURE)
	482	;
	483	return -1;
	484	}
1553ab04 TB	485	/* This first case is a hack, since it assumes that the 3rd parameter to
	486	FREAD is 1. See the redefinition of FREAD above to see how this works. */
	487	#ifdef USE_PERLIO
	488	if (FREAD(ldbuf, sh.s_size, 1, ldp) != sh.s_size) {
	489	#else
a0d0e21e	490	if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
1553ab04	491	#endif
a0d0e21e LW	492	errvalid++;
	493	strcpy(errbuf, "readExports: cannot read loader section");
	494	safefree(ldbuf);
	495	while(ldclose(ldp) == FAILURE)
	496	;
	497	return -1;
	498	}
	499	lhp = (LDHDR *)ldbuf;
	500	ls = (LDSYM *)(ldbuf+LDHDRSZ);
	501	/*
	502	* Count the number of exports to include in our export table.
	503	*/
	504	for (i = lhp->l_nsyms; i; i--, ls++) {
	505	if (!LDR_EXPORT(*ls))
	506	continue;
	507	mp->nExports++;
	508	}
	509	Newz(1001, mp->exports, mp->nExports, Export);
	510	if (mp->exports == NULL) {
	511	errvalid++;
	512	strcpy(errbuf, "readExports: ");
fd206186	513	strerrorcat(errbuf, errno);
a0d0e21e LW	514	safefree(ldbuf);
	515	while(ldclose(ldp) == FAILURE)
	516	;
	517	return -1;
	518	}
	519	/*
	520	* Fill in the export table. All entries are relative to
	521	* the entry point we got from load.
	522	*/
	523	ep = mp->exports;
	524	ls = (LDSYM *)(ldbuf+LDHDRSZ);
	525	for (i = lhp->l_nsyms; i; i--, ls++) {
	526	char *symname;
	527	if (!LDR_EXPORT(*ls))
	528	continue;
	529	if (ls->l_zeroes == 0)
	530	symname = ls->l_offset+lhp->l_stoff+ldbuf;
	531	else
	532	symname = ls->l_name;
	533	ep->name = savepv(symname);
	534	ep->addr = (void *)((unsigned long)mp->entry + ls->l_value);
	535	ep++;
	536	}
	537	safefree(ldbuf);
	538	while(ldclose(ldp) == FAILURE)
	539	;
	540	return 0;
	541	}
	542
a0d0e21e LW	543	/* dl_dlopen.xs
	544	*
	545	* Platform: SunOS/Solaris, possibly others which use dlopen.
	546	* Author: Paul Marquess (pmarquess@bfsec.bt.co.uk)
	547	* Created: 10th July 1994
	548	*
	549	* Modified:
	550	* 15th July 1994 - Added code to explicitly save any error messages.
	551	* 3rd August 1994 - Upgraded to v3 spec.
	552	* 9th August 1994 - Changed to use IV
	553	* 10th August 1994 - Tim Bunce: Added RTLD_LAZY, switchable debugging,
	554	* basic FreeBSD support, removed ClearError
	555	*
	556	*/
	557
	558	/* Porting notes:
	559
	560	see dl_dlopen.xs
	561
	562	*/
	563
	564	#include "dlutils.c" /* SaveError() etc */
	565
	566
	567	static void
cea2e8a9	568	dl_private_init(pTHX)
a0d0e21e	569	{
cea2e8a9	570	(void)dl_generic_private_init(aTHX);
a0d0e21e LW	571	}
	572
	573	MODULE = DynaLoader PACKAGE = DynaLoader
	574
	575	BOOT:
cea2e8a9	576	(void)dl_private_init(aTHX);
a0d0e21e LW	577
	578
	579	void *
ff7f3c60 NIS	580	dl_load_file(filename, flags=0)
	581	char * filename
	582	int flags
a0d0e21e	583	CODE:
ff7f3c60 NIS	584	DLDEBUG(1,PerlIO_printf(PerlIO_stderr(), "dl_load_file(%s,%x):\n", filename,flags));
ff7f3c60 NIS	585	if (flags & 0x01)
cea2e8a9	586	Perl_warn(aTHX_ "Can't make loaded symbols global on this platform while loading %s",filename);
a0d0e21e	587	RETVAL = dlopen(filename, 1) ;
760ac839	588	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " libref=%x\n", RETVAL));
a0d0e21e LW	589	ST(0) = sv_newmortal() ;
a0d0e21e LW	590	if (RETVAL == NULL)
cea2e8a9	591	SaveError(aTHX_ "%s",dlerror()) ;
a0d0e21e LW	592	else
	593	sv_setiv( ST(0), (IV)RETVAL);
	594
	595
	596	void *
	597	dl_find_symbol(libhandle, symbolname)
	598	void * libhandle
	599	char * symbolname
	600	CODE:
760ac839	601	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_find_symbol(handle=%x, symbol=%s)\n",
a0d0e21e LW	602	libhandle, symbolname));
a0d0e21e LW	603	RETVAL = dlsym(libhandle, symbolname);
760ac839	604	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " symbolref = %x\n", RETVAL));
a0d0e21e LW	605	ST(0) = sv_newmortal() ;
a0d0e21e LW	606	if (RETVAL == NULL)
cea2e8a9	607	SaveError(aTHX_ "%s",dlerror()) ;
a0d0e21e LW	608	else
	609	sv_setiv( ST(0), (IV)RETVAL);
	610
	611
	612	void
	613	dl_undef_symbols()
	614	PPCODE:
	615
	616
	617
	618	# These functions should not need changing on any platform:
	619
	620	void
	621	dl_install_xsub(perl_name, symref, filename="$Package")
	622	char * perl_name
	623	void * symref
	624	char * filename
	625	CODE:
760ac839	626	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_install_xsub(name=%s, symref=%x)\n",
a0d0e21e	627	perl_name, symref));
cea2e8a9 GS	628	ST(0) = sv_2mortal(newRV((SV*)newXS(perl_name,
	629	(void()(pTHX_ CV ))symref,
	630	filename)));
a0d0e21e LW	631
	632
	633	char *
	634	dl_error()
	635	CODE:
	636	RETVAL = LastError ;
	637	OUTPUT:
	638	RETVAL
	639
	640	# end.