[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 * This is an unpublished work copyright (c) 1992 Helios Software GmbH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;

/*
 * 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];
static int errvalid;

static void caterr(char *);
static int readExports(ModulePtr);
static void terminate(void);
static void *findMain(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, sizeof(buf)) == 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, sizeof(buf)) == 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)
{
	register ModulePtr mp;
	static void *mainModule;

	/*
	 * Upon the first call register a terminate handler that will
	 * close all libraries. Also get a reference to the main module
	 * for use with loadbind.
	 */
	if (!mainModule) {
		if ((mainModule = findMain()) == NULL)
			return NULL;
		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, L_NOAUTODEFER, NULL)) == NULL) {
		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 (errno == ENOEXEC) {
			char *tmp[BUFSIZ/sizeof(char *)];
			if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1)
				strerrorcpy(errbuf, errno);
			else {
				char **p;
				for (p = tmp; *p; p++)
					caterr(*p);
			}
		} else
			strerrorcat(errbuf, errno);
		return NULL;
	}
	mp->refCnt = 1;
	mp->next = modList;
	modList = mp;
	if (loadbind(0, mainModule, mp->entry) == -1) {
		dlclose(mp);
		errvalid++;
		strcpy(errbuf, "loadbind: ");
		strerrorcat(errbuf, errno);
		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)
{
	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;
}

/*
 * Find the main modules entry point. This is used as export pointer
 * for loadbind() to be able to resolve references to the main part.
 */
static void * findMain(void)
{
	struct ld_info *lp;
	char *buf;
	int size = 4*1024;
	int i;
	void *ret;

	if ((buf = safemalloc(size)) == NULL) {
		errvalid++;
		strcpy(errbuf, "findMain: ");
		strerrorcat(errbuf, errno);
		return NULL;
	}
	while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
		safefree(buf);
		size += 4*1024;
		if ((buf = safemalloc(size)) == NULL) {
			errvalid++;
			strcpy(errbuf, "findMain: ");
			strerrorcat(errbuf, errno);
			return NULL;
		}
	}
	if (i == -1) {
		errvalid++;
		strcpy(errbuf, "findMain: ");
		strerrorcat(errbuf, errno);
		safefree(buf);
		return NULL;
	}
	/*
	 * The first entry is the main module. The entry point
	 * returned by load() does actually point to the data
	 * segment origin.
	 */
	lp = (struct ld_info *)buf;
	ret = lp->ldinfo_dataorg;
	safefree(buf);
	return ret;
}

/* 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()
{
    (void)dl_generic_private_init();
}
 
MODULE = DynaLoader     PACKAGE = DynaLoader

BOOT:
    (void)dl_private_init();


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)
	    warn("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("%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("%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(*)())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	*/
	80	static ModulePtr modList;
	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	*/
	86	static char errbuf[BUFSIZ];
	87	static int errvalid;
	88
	89	static void caterr(char *);
	90	static int readExports(ModulePtr);
	91	static void terminate(void);
	92	static void *findMain(void);
	93
ce637636 JH	94	static char *strerror_failed = "(strerror failed)";
	95	static char *strerror_r_failed = "(strerror_r failed)";
	96
fd206186	97	char strerrorcat(char str, int err) {
ce637636 JH	98	int strsiz = strlen(str);
	99	int msgsiz;
	100	char *msg;
	101
	102	#ifdef USE_THREADS
	103	char *buf = malloc(BUFSIZ);
	104
	105	if (buf == 0)
	106	return 0;
	107	if (strerror_r(err, buf, sizeof(buf)) == 0)
	108	msg = buf;
	109	else
	110	msg = strerror_r_failed;
	111	msgsiz = strlen(msg);
	112	if (strsiz + msgsiz < BUFSIZ)
	113	strcat(str, msg);
	114	free(buf);
	115	#else
	116	if ((msg = strerror(err)) == 0)
	117	msg = strerror_failed;
	118	msgsiz = strlen(msg); /* Note msg = buf and free() above. */
	119	if (strsiz + msgsiz < BUFSIZ) /* Do not move this after #endif. */
	120	strcat(str, msg);
	121	#endif
	122
fd206186 JH	123	return str;
fd206186 JH	124	}
ce637636	125
fd206186	126	char strerrorcpy(char str, int err) {
ce637636 JH	127	int msgsiz;
	128	char *msg;
	129
	130	#ifdef USE_THREADS
	131	char *buf = malloc(BUFSIZ);
	132
	133	if (buf == 0)
	134	return 0;
	135	if (strerror_r(err, buf, sizeof(buf)) == 0)
	136	msg = buf;
	137	else
	138	msg = strerror_r_failed;
	139	msgsiz = strlen(msg);
	140	if (msgsiz < BUFSIZ)
	141	strcpy(str, msg);
	142	free(buf);
	143	#else
	144	if ((msg = strerror(err)) == 0)
	145	msg = strerror_failed;
	146	msgsiz = strlen(msg); /* Note msg = buf and free() above. */
	147	if (msgsiz < BUFSIZ) /* Do not move this after #endif. */
	148	strcpy(str, msg);
	149	#endif
	150
fd206186 JH	151	return str;
fd206186 JH	152	}
a0d0e21e LW	153
	154	/* ARGSUSED */
	155	void dlopen(char path, int mode)
	156	{
	157	register ModulePtr mp;
	158	static void *mainModule;
	159
	160	/*
	161	* Upon the first call register a terminate handler that will
	162	* close all libraries. Also get a reference to the main module
	163	* for use with loadbind.
	164	*/
	165	if (!mainModule) {
	166	if ((mainModule = findMain()) == NULL)
	167	return NULL;
	168	atexit(terminate);
	169	}
	170	/*
	171	* Scan the list of modules if have the module already loaded.
	172	*/
	173	for (mp = modList; mp; mp = mp->next)
	174	if (strcmp(mp->name, path) == 0) {
	175	mp->refCnt++;
	176	return mp;
	177	}
	178	Newz(1000,mp,1,Module);
	179	if (mp == NULL) {
	180	errvalid++;
	181	strcpy(errbuf, "Newz: ");
fd206186	182	strerrorcat(errbuf, errno);
a0d0e21e LW	183	return NULL;
	184	}
	185
	186	if ((mp->name = savepv(path)) == NULL) {
	187	errvalid++;
	188	strcpy(errbuf, "savepv: ");
fd206186	189	strerrorcat(errbuf, errno);
a0d0e21e LW	190	safefree(mp);
	191	return NULL;
	192	}
	193	/*
	194	* load should be declared load(const char *...). Thus we
	195	* cast the path to a normal char *. Ugly.
	196	*/
	197	if ((mp->entry = (void )load((char )path, L_NOAUTODEFER, NULL)) == NULL) {
	198	safefree(mp->name);
	199	safefree(mp);
	200	errvalid++;
	201	strcpy(errbuf, "dlopen: ");
	202	strcat(errbuf, path);
	203	strcat(errbuf, ": ");
	204	/*
	205	* If AIX says the file is not executable, the error
	206	* can be further described by querying the loader about
	207	* the last error.
	208	*/
	209	if (errno == ENOEXEC) {
	210	char tmp[BUFSIZ/sizeof(char )];
	211	if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1)
fd206186	212	strerrorcpy(errbuf, errno);
a0d0e21e LW	213	else {
	214	char **p;
	215	for (p = tmp; *p; p++)
	216	caterr(*p);
	217	}
	218	} else
fd206186	219	strerrorcat(errbuf, errno);
a0d0e21e LW	220	return NULL;
	221	}
	222	mp->refCnt = 1;
	223	mp->next = modList;
	224	modList = mp;
	225	if (loadbind(0, mainModule, mp->entry) == -1) {
	226	dlclose(mp);
	227	errvalid++;
	228	strcpy(errbuf, "loadbind: ");
fd206186	229	strerrorcat(errbuf, errno);
a0d0e21e LW	230	return NULL;
	231	}
	232	if (readExports(mp) == -1) {
	233	dlclose(mp);
	234	return NULL;
	235	}
	236	return mp;
	237	}
	238
	239	/*
	240	* Attempt to decipher an AIX loader error message and append it
	241	* to our static error message buffer.
	242	*/
	243	static void caterr(char *s)
	244	{
	245	register char *p = s;
	246
	247	while (p >= '0' && p <= '9')
	248	p++;
	249	switch(atoi(s)) {
	250	case L_ERROR_TOOMANY:
	251	strcat(errbuf, "to many errors");
	252	break;
	253	case L_ERROR_NOLIB:
	254	strcat(errbuf, "can't load library");
	255	strcat(errbuf, p);
	256	break;
	257	case L_ERROR_UNDEF:
	258	strcat(errbuf, "can't find symbol");
	259	strcat(errbuf, p);
	260	break;
	261	case L_ERROR_RLDBAD:
	262	strcat(errbuf, "bad RLD");
	263	strcat(errbuf, p);
	264	break;
	265	case L_ERROR_FORMAT:
	266	strcat(errbuf, "bad exec format in");
	267	strcat(errbuf, p);
	268	break;
	269	case L_ERROR_ERRNO:
fd206186	270	strerrorcat(errbuf, atoi(++p));
a0d0e21e LW	271	break;
	272	default:
	273	strcat(errbuf, s);
	274	break;
	275	}
	276	}
	277
	278	void dlsym(void handle, const char *symbol)
	279	{
	280	register ModulePtr mp = (ModulePtr)handle;
	281	register ExportPtr ep;
	282	register int i;
	283
	284	/*
	285	* Could speed up search, but I assume that one assigns
	286	* the result to function pointers anyways.
	287	*/
	288	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
	289	if (strcmp(ep->name, symbol) == 0)
	290	return ep->addr;
	291	errvalid++;
	292	strcpy(errbuf, "dlsym: undefined symbol ");
	293	strcat(errbuf, symbol);
	294	return NULL;
	295	}
	296
	297	char *dlerror(void)
	298	{
	299	if (errvalid) {
	300	errvalid = 0;
	301	return errbuf;
	302	}
	303	return NULL;
	304	}
	305
	306	int dlclose(void *handle)
	307	{
	308	register ModulePtr mp = (ModulePtr)handle;
	309	int result;
	310	register ModulePtr mp1;
	311
	312	if (--mp->refCnt > 0)
	313	return 0;
	314	result = unload(mp->entry);
	315	if (result == -1) {
	316	errvalid++;
fd206186	317	strerrorcpy(errbuf, errno);
a0d0e21e LW	318	}
	319	if (mp->exports) {
	320	register ExportPtr ep;
	321	register int i;
	322	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
	323	if (ep->name)
	324	safefree(ep->name);
	325	safefree(mp->exports);
	326	}
	327	if (mp == modList)
	328	modList = mp->next;
	329	else {
	330	for (mp1 = modList; mp1; mp1 = mp1->next)
	331	if (mp1->next == mp) {
	332	mp1->next = mp->next;
	333	break;
	334	}
	335	}
	336	safefree(mp->name);
	337	safefree(mp);
	338	return result;
	339	}
	340
	341	static void terminate(void)
	342	{
	343	while (modList)
	344	dlclose(modList);
	345	}
	346
	347	/* Added by Wayne Scott
	348	* This is needed because the ldopen system call calls
	349	* calloc to allocated a block of date. The ldclose call calls free.
	350	* Without this we get this system calloc and perl's free, resulting
	351	* in a "Bad free" message. This way we always use perl's malloc.
	352	*/
	353	void *calloc(size_t ne, size_t sz)
	354	{
	355	void *out;
	356
	357	out = (void ) safemalloc(nesz);
	358	memzero(out, ne*sz);
	359	return(out);
	360	}
	361
	362	/*
	363	* Build the export table from the XCOFF .loader section.
	364	*/
	365	static int readExports(ModulePtr mp)
	366	{
	367	LDFILE *ldp = NULL;
	368	SCNHDR sh;
	369	LDHDR *lhp;
	370	char *ldbuf;
	371	LDSYM *ls;
	372	int i;
	373	ExportPtr ep;
	374
	375	if ((ldp = ldopen(mp->name, ldp)) == NULL) {
	376	struct ld_info *lp;
	377	char *buf;
	378	int size = 4*1024;
	379	if (errno != ENOENT) {
	380	errvalid++;
	381	strcpy(errbuf, "readExports: ");
fd206186	382	strerrorcat(errbuf, errno);
a0d0e21e LW	383	return -1;
	384	}
	385	/*
	386	* The module might be loaded due to the LIBPATH
	387	* environment variable. Search for the loaded
	388	* module using L_GETINFO.
	389	*/
	390	if ((buf = safemalloc(size)) == NULL) {
	391	errvalid++;
	392	strcpy(errbuf, "readExports: ");
fd206186	393	strerrorcat(errbuf, errno);
a0d0e21e LW	394	return -1;
	395	}
	396	while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
	397	safefree(buf);
	398	size += 4*1024;
	399	if ((buf = safemalloc(size)) == NULL) {
	400	errvalid++;
	401	strcpy(errbuf, "readExports: ");
fd206186	402	strerrorcat(errbuf, errno);
a0d0e21e LW	403	return -1;
	404	}
	405	}
	406	if (i == -1) {
	407	errvalid++;
	408	strcpy(errbuf, "readExports: ");
fd206186	409	strerrorcat(errbuf, errno);
a0d0e21e LW	410	safefree(buf);
	411	return -1;
	412	}
	413	/*
	414	* Traverse the list of loaded modules. The entry point
	415	* returned by load() does actually point to the data
	416	* segment origin.
	417	*/
	418	lp = (struct ld_info *)buf;
	419	while (lp) {
	420	if (lp->ldinfo_dataorg == mp->entry) {
	421	ldp = ldopen(lp->ldinfo_filename, ldp);
	422	break;
	423	}
	424	if (lp->ldinfo_next == 0)
	425	lp = NULL;
	426	else
	427	lp = (struct ld_info )((char )lp + lp->ldinfo_next);
	428	}
	429	safefree(buf);
	430	if (!ldp) {
	431	errvalid++;
	432	strcpy(errbuf, "readExports: ");
fd206186	433	strerrorcat(errbuf, errno);
a0d0e21e LW	434	return -1;
	435	}
	436	}
	437	if (TYPE(ldp) != U802TOCMAGIC) {
	438	errvalid++;
	439	strcpy(errbuf, "readExports: bad magic");
	440	while(ldclose(ldp) == FAILURE)
	441	;
	442	return -1;
	443	}
	444	if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
	445	errvalid++;
	446	strcpy(errbuf, "readExports: cannot read loader section header");
	447	while(ldclose(ldp) == FAILURE)
	448	;
	449	return -1;
	450	}
	451	/*
	452	* We read the complete loader section in one chunk, this makes
	453	* finding long symbol names residing in the string table easier.
	454	*/
	455	if ((ldbuf = (char *)safemalloc(sh.s_size)) == NULL) {
	456	errvalid++;
	457	strcpy(errbuf, "readExports: ");
fd206186	458	strerrorcat(errbuf, errno);
a0d0e21e LW	459	while(ldclose(ldp) == FAILURE)
	460	;
	461	return -1;
	462	}
	463	if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
	464	errvalid++;
	465	strcpy(errbuf, "readExports: cannot seek to loader section");
	466	safefree(ldbuf);
	467	while(ldclose(ldp) == FAILURE)
	468	;
	469	return -1;
	470	}
1553ab04 TB	471	/* This first case is a hack, since it assumes that the 3rd parameter to
	472	FREAD is 1. See the redefinition of FREAD above to see how this works. */
	473	#ifdef USE_PERLIO
	474	if (FREAD(ldbuf, sh.s_size, 1, ldp) != sh.s_size) {
	475	#else
a0d0e21e	476	if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
1553ab04	477	#endif
a0d0e21e LW	478	errvalid++;
	479	strcpy(errbuf, "readExports: cannot read loader section");
	480	safefree(ldbuf);
	481	while(ldclose(ldp) == FAILURE)
	482	;
	483	return -1;
	484	}
	485	lhp = (LDHDR *)ldbuf;
	486	ls = (LDSYM *)(ldbuf+LDHDRSZ);
	487	/*
	488	* Count the number of exports to include in our export table.
	489	*/
	490	for (i = lhp->l_nsyms; i; i--, ls++) {
	491	if (!LDR_EXPORT(*ls))
	492	continue;
	493	mp->nExports++;
	494	}
	495	Newz(1001, mp->exports, mp->nExports, Export);
	496	if (mp->exports == NULL) {
	497	errvalid++;
	498	strcpy(errbuf, "readExports: ");
fd206186	499	strerrorcat(errbuf, errno);
a0d0e21e LW	500	safefree(ldbuf);
	501	while(ldclose(ldp) == FAILURE)
	502	;
	503	return -1;
	504	}
	505	/*
	506	* Fill in the export table. All entries are relative to
	507	* the entry point we got from load.
	508	*/
	509	ep = mp->exports;
	510	ls = (LDSYM *)(ldbuf+LDHDRSZ);
	511	for (i = lhp->l_nsyms; i; i--, ls++) {
	512	char *symname;
	513	if (!LDR_EXPORT(*ls))
	514	continue;
	515	if (ls->l_zeroes == 0)
	516	symname = ls->l_offset+lhp->l_stoff+ldbuf;
	517	else
	518	symname = ls->l_name;
	519	ep->name = savepv(symname);
	520	ep->addr = (void *)((unsigned long)mp->entry + ls->l_value);
	521	ep++;
	522	}
	523	safefree(ldbuf);
	524	while(ldclose(ldp) == FAILURE)
	525	;
	526	return 0;
	527	}
	528
	529	/*
	530	* Find the main modules entry point. This is used as export pointer
	531	* for loadbind() to be able to resolve references to the main part.
	532	*/
	533	static void * findMain(void)
	534	{
	535	struct ld_info *lp;
	536	char *buf;
	537	int size = 4*1024;
	538	int i;
	539	void *ret;
	540
	541	if ((buf = safemalloc(size)) == NULL) {
	542	errvalid++;
	543	strcpy(errbuf, "findMain: ");
fd206186	544	strerrorcat(errbuf, errno);
a0d0e21e LW	545	return NULL;
	546	}
	547	while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
	548	safefree(buf);
	549	size += 4*1024;
	550	if ((buf = safemalloc(size)) == NULL) {
	551	errvalid++;
	552	strcpy(errbuf, "findMain: ");
fd206186	553	strerrorcat(errbuf, errno);
a0d0e21e LW	554	return NULL;
	555	}
	556	}
	557	if (i == -1) {
	558	errvalid++;
	559	strcpy(errbuf, "findMain: ");
fd206186	560	strerrorcat(errbuf, errno);
a0d0e21e LW	561	safefree(buf);
	562	return NULL;
	563	}
	564	/*
	565	* The first entry is the main module. The entry point
	566	* returned by load() does actually point to the data
	567	* segment origin.
	568	*/
	569	lp = (struct ld_info *)buf;
	570	ret = lp->ldinfo_dataorg;
	571	safefree(buf);
	572	return ret;
	573	}
	574
	575	/* dl_dlopen.xs
	576	*
	577	* Platform: SunOS/Solaris, possibly others which use dlopen.
	578	* Author: Paul Marquess (pmarquess@bfsec.bt.co.uk)
	579	* Created: 10th July 1994
	580	*
	581	* Modified:
	582	* 15th July 1994 - Added code to explicitly save any error messages.
	583	* 3rd August 1994 - Upgraded to v3 spec.
	584	* 9th August 1994 - Changed to use IV
	585	* 10th August 1994 - Tim Bunce: Added RTLD_LAZY, switchable debugging,
	586	* basic FreeBSD support, removed ClearError
	587	*
	588	*/
	589
	590	/* Porting notes:
	591
	592	see dl_dlopen.xs
	593
	594	*/
	595
	596	#include "dlutils.c" /* SaveError() etc */
	597
	598
	599	static void
	600	dl_private_init()
	601	{
	602	(void)dl_generic_private_init();
	603	}
	604
	605	MODULE = DynaLoader PACKAGE = DynaLoader
	606
	607	BOOT:
	608	(void)dl_private_init();
	609
	610
	611	void *
ff7f3c60 NIS	612	dl_load_file(filename, flags=0)
	613	char * filename
	614	int flags
a0d0e21e	615	CODE:
ff7f3c60 NIS	616	DLDEBUG(1,PerlIO_printf(PerlIO_stderr(), "dl_load_file(%s,%x):\n", filename,flags));
	617	if (flags & 0x01)
	618	warn("Can't make loaded symbols global on this platform while loading %s",filename);
a0d0e21e	619	RETVAL = dlopen(filename, 1) ;
760ac839	620	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " libref=%x\n", RETVAL));
a0d0e21e LW	621	ST(0) = sv_newmortal() ;
	622	if (RETVAL == NULL)
	623	SaveError("%s",dlerror()) ;
	624	else
	625	sv_setiv( ST(0), (IV)RETVAL);
	626
	627
	628	void *
	629	dl_find_symbol(libhandle, symbolname)
	630	void * libhandle
	631	char * symbolname
	632	CODE:
760ac839	633	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_find_symbol(handle=%x, symbol=%s)\n",
a0d0e21e LW	634	libhandle, symbolname));
a0d0e21e LW	635	RETVAL = dlsym(libhandle, symbolname);
760ac839	636	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " symbolref = %x\n", RETVAL));
a0d0e21e LW	637	ST(0) = sv_newmortal() ;
	638	if (RETVAL == NULL)
	639	SaveError("%s",dlerror()) ;
	640	else
	641	sv_setiv( ST(0), (IV)RETVAL);
	642
	643
	644	void
	645	dl_undef_symbols()
	646	PPCODE:
	647
	648
	649
	650	# These functions should not need changing on any platform:
	651
	652	void
	653	dl_install_xsub(perl_name, symref, filename="$Package")
	654	char * perl_name
	655	void * symref
	656	char * filename
	657	CODE:
760ac839	658	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_install_xsub(name=%s, symref=%x)\n",
a0d0e21e LW	659	perl_name, symref));
	660	ST(0)=sv_2mortal(newRV((SV)newXS(perl_name, (void()())symref, filename)));
	661
	662
	663	char *
	664	dl_error()
	665	CODE:
	666	RETVAL = LastError ;
	667	OUTPUT:
	668	RETVAL
	669
	670	# end.