[p5sagit/p5-mst-13.2.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.
 */

#define PERLIO_NOT_STDIO 0

/*
 * On AIX 4.3 and above the emulation layer is not needed any more, and
 * indeed if perl uses its emulation and perl is linked into apache
 * which is supposed to use the native dlopen conflicts arise.
 * Jens-Uwe Mager jum@helios.de
 */
#ifdef USE_NATIVE_DLOPEN

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include <dlfcn.h>

#else

/*
 * @(#)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 * This is an unpublished work copyright (c) 1992 Helios Software GmbH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"

/* When building as a 64-bit binary on AIX, define this to get the
 * correct structure definitions.  Also determines the field-name
 * macros and gates some logic in readEntries().  -- Steven N. Hirsch
 * <hirschs@btv.ibm.com> */
#ifdef USE_64_BIT_ALL
#   define __XCOFF64__
#   define __XCOFF32__
#endif

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

#ifdef USE_64_BIT_ALL
#   define AIX_SCNHDR SCNHDR_64
#   define AIX_LDHDR LDHDR_64
#   define AIX_LDSYM LDSYM_64
#   define AIX_LDHDRSZ LDHDRSZ_64
#else
#   define AIX_SCNHDR SCNHDR
#   define AIX_LDHDR LDHDR
#   define AIX_LDSYM LDSYM
#   define AIX_LDHDRSZ LDHDRSZ
#endif

/* When using Perl extensions written in C++ the longer versions
 * of load() and unload() from libC and libC_r need to be used,
 * otherwise statics in the extensions won't get initialized right.
 * -- Stephanie Beals <bealzy@us.ibm.com> */

/* Older AIX C compilers cannot deal with C++ double-slash comments in
   the ibmcxx and/or xlC includes.  Since we only need a single file,
   be more fine-grained about what's included <hirschs@btv.ibm.com> */
#ifdef USE_libC /* The define comes, when it comes, from hints/aix.pl. */
#   define LOAD   loadAndInit
#   define UNLOAD terminateAndUnload
#   if defined(USE_xlC_load_h)
#       include "/usr/lpp/xlC/include/load.h"
#   elif defined(USE_ibmcxx_load_h)
#       include "/usr/ibmcxx/include/load.h"
#   endif
#else
#   define LOAD   load
#   define UNLOAD unload
#endif

/*
 * 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

#ifndef RTLD_LAZY
# define RTLD_LAZY 0
#endif
#ifndef RTLD_GLOBAL
# define RTLD_GLOBAL 0
#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 reference count
 * duplicate dlopen's.
 */
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 *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, 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 void *mainModule;		/* XXX threaded */

	/*
	 * Upon the first call register a terminate handler that will
	 * close all libraries.
	 */
	if (mainModule == NULL) {
		if ((mainModule = findMain()) == NULL)
			return NULL;
	}
	/*
	 * 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. Also bind
	 * against the main part, in the case a perl is not the main
	 * part, e.g mod_perl as DSO in Apache so perl modules can
	 * also reference Apache symbols.
	 */
	if (loadbind(0, (void *)dlopen, mp->entry) == -1 ||
	    loadbind(0, mainModule, mp->entry)) {
	        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, "too 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;
}

/* 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;
	AIX_SCNHDR sh;
	AIX_LDHDR *lhp;
	char *ldbuf;
	AIX_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;
		}
	}
#ifdef USE_64_BIT_ALL
	if (TYPE(ldp) != U803XTOCMAGIC) {
#else
	if (TYPE(ldp) != U802TOCMAGIC) {
#endif
		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. */
	if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
		errvalid++;
		strcpy(errbuf, "readExports: cannot read loader section");
		safefree(ldbuf);
		while(ldclose(ldp) == FAILURE)
			;
		return -1;
	}
	lhp = (AIX_LDHDR *)ldbuf;
	ls = (AIX_LDSYM *)(ldbuf+AIX_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 = (AIX_LDSYM *)(ldbuf+AIX_LDHDRSZ);
	for (i = lhp->l_nsyms; i; i--, ls++) {
		char *symname;
		if (!LDR_EXPORT(*ls))
			continue;
#ifndef USE_64_BIT_ALL
		if (ls->l_zeroes == 0)
#endif
			symname = ls->l_offset+lhp->l_stoff+ldbuf;
#ifndef USE_64_BIT_ALL
		else
			symname = ls->l_name;
#endif
		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;
}
#endif /* USE_NATIVE_DLOPEN */

/* dl_dlopen.xs
 * 
 * Platform:	SunOS/Solaris, possibly others which use dlopen.
 * Author:	Paul Marquess (Paul.Marquess@btinternet.com)
 * 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(Perl_debug_log, "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, RTLD_GLOBAL|RTLD_LAZY) ;
	DLDEBUG(2,PerlIO_printf(Perl_debug_log, " libref=%x\n", RETVAL));
	ST(0) = sv_newmortal() ;
	if (RETVAL == NULL)
	    SaveError(aTHX_ "%s",dlerror()) ;
	else
	    sv_setiv( ST(0), PTR2IV(RETVAL) );

int
dl_unload_file(libref)
    void *	libref
  CODE:
    DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_unload_file(%lx):\n", libref));
    RETVAL = (dlclose(libref) == 0 ? 1 : 0);
    if (!RETVAL)
        SaveError(aTHX_ "%s", dlerror()) ;
    DLDEBUG(2,PerlIO_printf(Perl_debug_log, " retval = %d\n", RETVAL));
  OUTPUT:
    RETVAL

void *
dl_find_symbol(libhandle, symbolname)
	void *		libhandle
	char *		symbolname
	CODE:
	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_find_symbol(handle=%x, symbol=%s)\n",
		libhandle, symbolname));
	RETVAL = dlsym(libhandle, symbolname);
	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "  symbolref = %x\n", RETVAL));
	ST(0) = sv_newmortal() ;
	if (RETVAL == NULL)
	    SaveError(aTHX_ "%s",dlerror()) ;
	else
	    sv_setiv( ST(0), PTR2IV(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(Perl_debug_log, "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	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
077440d8	14	#define PERLIO_NOT_STDIO 0
077440d8	15
a0d0e21e	16	/*
30def704	17	* On AIX 4.3 and above the emulation layer is not needed any more, and
	18	* indeed if perl uses its emulation and perl is linked into apache
	19	* which is supposed to use the native dlopen conflicts arise.
	20	* Jens-Uwe Mager jum@helios.de
	21	*/
	22	#ifdef USE_NATIVE_DLOPEN
	23
	24	#include "EXTERN.h"
	25	#include "perl.h"
	26	#include "XSUB.h"
	27	#include <dlfcn.h>
	28
	29	#else
	30
	31	/*
a0d0e21e	32	* @(#)dlfcn.c 1.5 revision of 93/02/14 20:14:17
	33	* This is an unpublished work copyright (c) 1992 Helios Software GmbH
	34	* 3000 Hannover 1, Germany
	35	*/
	36	#include "EXTERN.h"
	37	#include "perl.h"
	38	#include "XSUB.h"
	39
19e194ad	40	/* When building as a 64-bit binary on AIX, define this to get the
	41	* correct structure definitions. Also determines the field-name
	42	* macros and gates some logic in readEntries(). -- Steven N. Hirsch
	43	* <hirschs@btv.ibm.com> */
	44	#ifdef USE_64_BIT_ALL
	45	# define __XCOFF64__
	46	# define __XCOFF32__
	47	#endif
	48
a0d0e21e	49	#include <stdio.h>
	50	#include <errno.h>
	51	#include <string.h>
	52	#include <stdlib.h>
	53	#include <sys/types.h>
	54	#include <sys/ldr.h>
	55	#include <a.out.h>
7ca86468	56	#undef FREAD
7ca86468	57	#undef FWRITE
a0d0e21e	58	#include <ldfcn.h>
a0d0e21e	59
19e194ad	60	#ifdef USE_64_BIT_ALL
	61	# define AIX_SCNHDR SCNHDR_64
	62	# define AIX_LDHDR LDHDR_64
	63	# define AIX_LDSYM LDSYM_64
	64	# define AIX_LDHDRSZ LDHDRSZ_64
	65	#else
	66	# define AIX_SCNHDR SCNHDR
	67	# define AIX_LDHDR LDHDR
	68	# define AIX_LDSYM LDSYM
	69	# define AIX_LDHDRSZ LDHDRSZ
	70	#endif
	71
4e774c84	72	/* When using Perl extensions written in C++ the longer versions
	73	* of load() and unload() from libC and libC_r need to be used,
	74	* otherwise statics in the extensions won't get initialized right.
	75	* -- Stephanie Beals <bealzy@us.ibm.com> */
bab3591f	76
	77	/* Older AIX C compilers cannot deal with C++ double-slash comments in
	78	the ibmcxx and/or xlC includes. Since we only need a single file,
	79	be more fine-grained about what's included <hirschs@btv.ibm.com> */
c88be79f	80	#ifdef USE_libC /* The define comes, when it comes, from hints/aix.pl. */
c88be79f	81	# define LOAD loadAndInit
4e774c84	82	# define UNLOAD terminateAndUnload
bab3591f	83	# if defined(USE_xlC_load_h)
	84	# include "/usr/lpp/xlC/include/load.h"
	85	# elif defined(USE_ibmcxx_load_h)
	86	# include "/usr/ibmcxx/include/load.h"
c88be79f	87	# endif
4e774c84	88	#else
	89	# define LOAD load
	90	# define UNLOAD unload
	91	#endif
	92
ee580363	93	/*
	94	* AIX 4.3 does remove some useful definitions from ldfcn.h. Define
	95	* these here to compensate for that lossage.
	96	*/
	97	#ifndef BEGINNING
	98	# define BEGINNING SEEK_SET
	99	#endif
	100	#ifndef FSEEK
	101	# define FSEEK(ldptr,o,p) fseek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr) +o):o,p)
	102	#endif
	103	#ifndef FREAD
	104	# define FREAD(p,s,n,ldptr) fread(p,s,n,IOPTR(ldptr))
	105	#endif
	106
30def704	107	#ifndef RTLD_LAZY
	108	# define RTLD_LAZY 0
	109	#endif
	110	#ifndef RTLD_GLOBAL
	111	# define RTLD_GLOBAL 0
	112	#endif
	113
a0d0e21e	114	/*
	115	* We simulate dlopen() et al. through a call to load. Because AIX has
	116	* no call to find an exported symbol we read the loader section of the
	117	* loaded module and build a list of exported symbols and their virtual
	118	* address.
	119	*/
	120
	121	typedef struct {
	122	char name; / the symbols's name */
	123	void addr; / its relocated virtual address */
	124	} Export, *ExportPtr;
	125
	126	/*
	127	* The void * handle returned from dlopen is actually a ModulePtr.
	128	*/
	129	typedef struct Module {
	130	struct Module *next;
	131	char name; / module name for refcounting */
	132	int refCnt; /* the number of references */
	133	void entry; / entry point from load */
	134	int nExports; /* the number of exports found */
	135	ExportPtr exports; /* the array of exports */
	136	} Module, *ModulePtr;
	137
	138	/*
7ca86468	139	* We keep a list of all loaded modules to be able to reference count
7ca86468	140	* duplicate dlopen's.
a0d0e21e	141	*/
549a6b10	142	static ModulePtr modList; /* XXX threaded */
a0d0e21e	143
	144	/*
	145	* The last error from one of the dl* routines is kept in static
	146	* variables here. Each error is returned only once to the caller.
	147	*/
549a6b10	148	static char errbuf[BUFSIZ]; /* XXX threaded */
549a6b10	149	static int errvalid; /* XXX threaded */
a0d0e21e	150
	151	static void caterr(char *);
	152	static int readExports(ModulePtr);
7ca86468	153	static void *findMain(void);
a0d0e21e	154
ce637636	155	static char *strerror_failed = "(strerror failed)";
	156	static char *strerror_r_failed = "(strerror_r failed)";
	157
fd206186	158	char strerrorcat(char str, int err) {
ce637636	159	int strsiz = strlen(str);
	160	int msgsiz;
	161	char *msg;
	162
	163	#ifdef USE_THREADS
	164	char *buf = malloc(BUFSIZ);
	165
	166	if (buf == 0)
	167	return 0;
549a6b10	168	if (strerror_r(err, buf, BUFSIZ) == 0)
ce637636	169	msg = buf;
	170	else
	171	msg = strerror_r_failed;
	172	msgsiz = strlen(msg);
	173	if (strsiz + msgsiz < BUFSIZ)
	174	strcat(str, msg);
	175	free(buf);
	176	#else
	177	if ((msg = strerror(err)) == 0)
	178	msg = strerror_failed;
	179	msgsiz = strlen(msg); /* Note msg = buf and free() above. */
	180	if (strsiz + msgsiz < BUFSIZ) /* Do not move this after #endif. */
	181	strcat(str, msg);
	182	#endif
	183
fd206186	184	return str;
fd206186	185	}
ce637636	186
fd206186	187	char strerrorcpy(char str, int err) {
ce637636	188	int msgsiz;
	189	char *msg;
	190
	191	#ifdef USE_THREADS
	192	char *buf = malloc(BUFSIZ);
	193
	194	if (buf == 0)
	195	return 0;
549a6b10	196	if (strerror_r(err, buf, BUFSIZ) == 0)
ce637636	197	msg = buf;
	198	else
	199	msg = strerror_r_failed;
	200	msgsiz = strlen(msg);
	201	if (msgsiz < BUFSIZ)
	202	strcpy(str, msg);
	203	free(buf);
	204	#else
	205	if ((msg = strerror(err)) == 0)
	206	msg = strerror_failed;
	207	msgsiz = strlen(msg); /* Note msg = buf and free() above. */
	208	if (msgsiz < BUFSIZ) /* Do not move this after #endif. */
	209	strcpy(str, msg);
	210	#endif
	211
fd206186	212	return str;
fd206186	213	}
a0d0e21e	214
	215	/* ARGSUSED */
	216	void dlopen(char path, int mode)
	217	{
5b877257	218	dTHX;
a0d0e21e	219	register ModulePtr mp;
7ca86468	220	static void mainModule; / XXX threaded */
a0d0e21e	221
	222	/*
	223	* Upon the first call register a terminate handler that will
f6b3007c	224	* close all libraries.
a0d0e21e	225	*/
7ca86468	226	if (mainModule == NULL) {
	227	if ((mainModule = findMain()) == NULL)
	228	return NULL;
a0d0e21e	229	}
	230	/*
	231	* Scan the list of modules if have the module already loaded.
	232	*/
	233	for (mp = modList; mp; mp = mp->next)
	234	if (strcmp(mp->name, path) == 0) {
	235	mp->refCnt++;
	236	return mp;
	237	}
	238	Newz(1000,mp,1,Module);
	239	if (mp == NULL) {
	240	errvalid++;
	241	strcpy(errbuf, "Newz: ");
fd206186	242	strerrorcat(errbuf, errno);
a0d0e21e	243	return NULL;
	244	}
	245
	246	if ((mp->name = savepv(path)) == NULL) {
	247	errvalid++;
	248	strcpy(errbuf, "savepv: ");
fd206186	249	strerrorcat(errbuf, errno);
a0d0e21e	250	safefree(mp);
	251	return NULL;
	252	}
549a6b10	253
a0d0e21e	254	/*
	255	* load should be declared load(const char *...). Thus we
	256	* cast the path to a normal char *. Ugly.
	257	*/
4e774c84	258	if ((mp->entry = (void )LOAD((char )path,
549a6b10	259	#ifdef L_LIBPATH_EXEC
	260	L_LIBPATH_EXEC \|
	261	#endif
	262	L_NOAUTODEFER,
	263	NULL)) == NULL) {
	264	int saverrno = errno;
	265
a0d0e21e	266	safefree(mp->name);
	267	safefree(mp);
	268	errvalid++;
	269	strcpy(errbuf, "dlopen: ");
	270	strcat(errbuf, path);
	271	strcat(errbuf, ": ");
	272	/*
	273	* If AIX says the file is not executable, the error
	274	* can be further described by querying the loader about
	275	* the last error.
	276	*/
549a6b10	277	if (saverrno == ENOEXEC) {
	278	char moreinfo[BUFSIZ/sizeof(char )];
	279	if (loadquery(L_GETMESSAGES, moreinfo, sizeof(moreinfo)) == -1)
	280	strerrorcpy(errbuf, saverrno);
a0d0e21e	281	else {
a0d0e21e	282	char **p;
549a6b10	283	for (p = moreinfo; *p; p++)
a0d0e21e	284	caterr(*p);
	285	}
	286	} else
549a6b10	287	strerrorcat(errbuf, saverrno);
a0d0e21e	288	return NULL;
	289	}
	290	mp->refCnt = 1;
	291	mp->next = modList;
	292	modList = mp;
f6b3007c	293	/*
	294	* Assume anonymous exports come from the module this dlopen
	295	* is linked into, that holds true as long as dlopen and all
7ca86468	296	* of the perl core are in the same shared object. Also bind
	297	* against the main part, in the case a perl is not the main
	298	* part, e.g mod_perl as DSO in Apache so perl modules can
	299	* also reference Apache symbols.
f6b3007c	300	*/
7ca86468	301	if (loadbind(0, (void *)dlopen, mp->entry) == -1 \|\|
7ca86468	302	loadbind(0, mainModule, mp->entry)) {
549a6b10	303	int saverrno = errno;
549a6b10	304
a0d0e21e	305	dlclose(mp);
	306	errvalid++;
	307	strcpy(errbuf, "loadbind: ");
549a6b10	308	strerrorcat(errbuf, saverrno);
a0d0e21e	309	return NULL;
	310	}
	311	if (readExports(mp) == -1) {
	312	dlclose(mp);
	313	return NULL;
	314	}
	315	return mp;
	316	}
	317
	318	/*
	319	* Attempt to decipher an AIX loader error message and append it
	320	* to our static error message buffer.
	321	*/
	322	static void caterr(char *s)
	323	{
	324	register char *p = s;
	325
	326	while (p >= '0' && p <= '9')
	327	p++;
	328	switch(atoi(s)) {
	329	case L_ERROR_TOOMANY:
42eb1a87	330	strcat(errbuf, "too many errors");
a0d0e21e	331	break;
	332	case L_ERROR_NOLIB:
	333	strcat(errbuf, "can't load library");
	334	strcat(errbuf, p);
	335	break;
	336	case L_ERROR_UNDEF:
	337	strcat(errbuf, "can't find symbol");
	338	strcat(errbuf, p);
	339	break;
	340	case L_ERROR_RLDBAD:
	341	strcat(errbuf, "bad RLD");
	342	strcat(errbuf, p);
	343	break;
	344	case L_ERROR_FORMAT:
	345	strcat(errbuf, "bad exec format in");
	346	strcat(errbuf, p);
	347	break;
	348	case L_ERROR_ERRNO:
fd206186	349	strerrorcat(errbuf, atoi(++p));
a0d0e21e	350	break;
	351	default:
	352	strcat(errbuf, s);
	353	break;
	354	}
	355	}
	356
	357	void dlsym(void handle, const char *symbol)
	358	{
	359	register ModulePtr mp = (ModulePtr)handle;
	360	register ExportPtr ep;
	361	register int i;
	362
	363	/*
	364	* Could speed up search, but I assume that one assigns
	365	* the result to function pointers anyways.
	366	*/
	367	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
	368	if (strcmp(ep->name, symbol) == 0)
	369	return ep->addr;
	370	errvalid++;
	371	strcpy(errbuf, "dlsym: undefined symbol ");
	372	strcat(errbuf, symbol);
	373	return NULL;
	374	}
	375
	376	char *dlerror(void)
	377	{
	378	if (errvalid) {
	379	errvalid = 0;
	380	return errbuf;
	381	}
	382	return NULL;
	383	}
	384
	385	int dlclose(void *handle)
	386	{
	387	register ModulePtr mp = (ModulePtr)handle;
	388	int result;
	389	register ModulePtr mp1;
	390
	391	if (--mp->refCnt > 0)
	392	return 0;
4e774c84	393	result = UNLOAD(mp->entry);
a0d0e21e	394	if (result == -1) {
a0d0e21e	395	errvalid++;
fd206186	396	strerrorcpy(errbuf, errno);
a0d0e21e	397	}
	398	if (mp->exports) {
	399	register ExportPtr ep;
	400	register int i;
	401	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
	402	if (ep->name)
	403	safefree(ep->name);
	404	safefree(mp->exports);
	405	}
	406	if (mp == modList)
	407	modList = mp->next;
	408	else {
	409	for (mp1 = modList; mp1; mp1 = mp1->next)
	410	if (mp1->next == mp) {
	411	mp1->next = mp->next;
	412	break;
	413	}
	414	}
	415	safefree(mp->name);
	416	safefree(mp);
	417	return result;
	418	}
	419
a0d0e21e	420	/* Added by Wayne Scott
	421	* This is needed because the ldopen system call calls
	422	* calloc to allocated a block of date. The ldclose call calls free.
	423	* Without this we get this system calloc and perl's free, resulting
	424	* in a "Bad free" message. This way we always use perl's malloc.
	425	*/
	426	void *calloc(size_t ne, size_t sz)
	427	{
	428	void *out;
	429
	430	out = (void ) safemalloc(nesz);
	431	memzero(out, ne*sz);
	432	return(out);
	433	}
	434
	435	/*
	436	* Build the export table from the XCOFF .loader section.
	437	*/
	438	static int readExports(ModulePtr mp)
	439	{
5b877257	440	dTHX;
a0d0e21e	441	LDFILE *ldp = NULL;
19e194ad	442	AIX_SCNHDR sh;
19e194ad	443	AIX_LDHDR *lhp;
a0d0e21e	444	char *ldbuf;
19e194ad	445	AIX_LDSYM *ls;
a0d0e21e	446	int i;
	447	ExportPtr ep;
	448
	449	if ((ldp = ldopen(mp->name, ldp)) == NULL) {
	450	struct ld_info *lp;
	451	char *buf;
	452	int size = 4*1024;
	453	if (errno != ENOENT) {
	454	errvalid++;
	455	strcpy(errbuf, "readExports: ");
fd206186	456	strerrorcat(errbuf, errno);
a0d0e21e	457	return -1;
	458	}
	459	/*
	460	* The module might be loaded due to the LIBPATH
	461	* environment variable. Search for the loaded
	462	* module using L_GETINFO.
	463	*/
	464	if ((buf = safemalloc(size)) == NULL) {
	465	errvalid++;
	466	strcpy(errbuf, "readExports: ");
fd206186	467	strerrorcat(errbuf, errno);
a0d0e21e	468	return -1;
	469	}
	470	while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
	471	safefree(buf);
	472	size += 4*1024;
	473	if ((buf = safemalloc(size)) == NULL) {
	474	errvalid++;
	475	strcpy(errbuf, "readExports: ");
fd206186	476	strerrorcat(errbuf, errno);
a0d0e21e	477	return -1;
	478	}
	479	}
	480	if (i == -1) {
	481	errvalid++;
	482	strcpy(errbuf, "readExports: ");
fd206186	483	strerrorcat(errbuf, errno);
a0d0e21e	484	safefree(buf);
	485	return -1;
	486	}
	487	/*
	488	* Traverse the list of loaded modules. The entry point
4e774c84	489	* returned by LOAD() does actually point to the data
a0d0e21e	490	* segment origin.
	491	*/
	492	lp = (struct ld_info *)buf;
	493	while (lp) {
	494	if (lp->ldinfo_dataorg == mp->entry) {
	495	ldp = ldopen(lp->ldinfo_filename, ldp);
	496	break;
	497	}
	498	if (lp->ldinfo_next == 0)
	499	lp = NULL;
	500	else
	501	lp = (struct ld_info )((char )lp + lp->ldinfo_next);
	502	}
	503	safefree(buf);
	504	if (!ldp) {
	505	errvalid++;
	506	strcpy(errbuf, "readExports: ");
fd206186	507	strerrorcat(errbuf, errno);
a0d0e21e	508	return -1;
	509	}
	510	}
19e194ad	511	#ifdef USE_64_BIT_ALL
	512	if (TYPE(ldp) != U803XTOCMAGIC) {
	513	#else
a0d0e21e	514	if (TYPE(ldp) != U802TOCMAGIC) {
19e194ad	515	#endif
a0d0e21e	516	errvalid++;
	517	strcpy(errbuf, "readExports: bad magic");
	518	while(ldclose(ldp) == FAILURE)
	519	;
	520	return -1;
	521	}
	522	if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
	523	errvalid++;
	524	strcpy(errbuf, "readExports: cannot read loader section header");
	525	while(ldclose(ldp) == FAILURE)
	526	;
	527	return -1;
	528	}
	529	/*
	530	* We read the complete loader section in one chunk, this makes
	531	* finding long symbol names residing in the string table easier.
	532	*/
	533	if ((ldbuf = (char *)safemalloc(sh.s_size)) == NULL) {
	534	errvalid++;
	535	strcpy(errbuf, "readExports: ");
fd206186	536	strerrorcat(errbuf, errno);
a0d0e21e	537	while(ldclose(ldp) == FAILURE)
	538	;
	539	return -1;
	540	}
	541	if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
	542	errvalid++;
	543	strcpy(errbuf, "readExports: cannot seek to loader section");
	544	safefree(ldbuf);
	545	while(ldclose(ldp) == FAILURE)
	546	;
	547	return -1;
	548	}
1553ab04	549	/* This first case is a hack, since it assumes that the 3rd parameter to
1553ab04	550	FREAD is 1. See the redefinition of FREAD above to see how this works. */
a0d0e21e	551	if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
	552	errvalid++;
	553	strcpy(errbuf, "readExports: cannot read loader section");
	554	safefree(ldbuf);
	555	while(ldclose(ldp) == FAILURE)
	556	;
	557	return -1;
	558	}
19e194ad	559	lhp = (AIX_LDHDR *)ldbuf;
19e194ad	560	ls = (AIX_LDSYM *)(ldbuf+AIX_LDHDRSZ);
a0d0e21e	561	/*
	562	* Count the number of exports to include in our export table.
	563	*/
	564	for (i = lhp->l_nsyms; i; i--, ls++) {
	565	if (!LDR_EXPORT(*ls))
	566	continue;
	567	mp->nExports++;
	568	}
	569	Newz(1001, mp->exports, mp->nExports, Export);
	570	if (mp->exports == NULL) {
	571	errvalid++;
	572	strcpy(errbuf, "readExports: ");
fd206186	573	strerrorcat(errbuf, errno);
a0d0e21e	574	safefree(ldbuf);
	575	while(ldclose(ldp) == FAILURE)
	576	;
	577	return -1;
	578	}
	579	/*
	580	* Fill in the export table. All entries are relative to
	581	* the entry point we got from load.
	582	*/
	583	ep = mp->exports;
19e194ad	584	ls = (AIX_LDSYM *)(ldbuf+AIX_LDHDRSZ);
a0d0e21e	585	for (i = lhp->l_nsyms; i; i--, ls++) {
	586	char *symname;
	587	if (!LDR_EXPORT(*ls))
	588	continue;
19e194ad	589	#ifndef USE_64_BIT_ALL
a0d0e21e	590	if (ls->l_zeroes == 0)
19e194ad	591	#endif
a0d0e21e	592	symname = ls->l_offset+lhp->l_stoff+ldbuf;
19e194ad	593	#ifndef USE_64_BIT_ALL
a0d0e21e	594	else
a0d0e21e	595	symname = ls->l_name;
19e194ad	596	#endif
a0d0e21e	597	ep->name = savepv(symname);
	598	ep->addr = (void *)((unsigned long)mp->entry + ls->l_value);
	599	ep++;
	600	}
	601	safefree(ldbuf);
	602	while(ldclose(ldp) == FAILURE)
	603	;
	604	return 0;
	605	}
	606
7ca86468	607	/*
	608	* Find the main modules entry point. This is used as export pointer
	609	* for loadbind() to be able to resolve references to the main part.
	610	*/
	611	static void * findMain(void)
	612	{
	613	struct ld_info *lp;
	614	char *buf;
	615	int size = 4*1024;
	616	int i;
	617	void *ret;
	618
	619	if ((buf = safemalloc(size)) == NULL) {
	620	errvalid++;
	621	strcpy(errbuf, "findMain: ");
	622	strerrorcat(errbuf, errno);
	623	return NULL;
	624	}
	625	while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
	626	safefree(buf);
	627	size += 4*1024;
	628	if ((buf = safemalloc(size)) == NULL) {
	629	errvalid++;
	630	strcpy(errbuf, "findMain: ");
	631	strerrorcat(errbuf, errno);
	632	return NULL;
	633	}
	634	}
	635	if (i == -1) {
	636	errvalid++;
	637	strcpy(errbuf, "findMain: ");
	638	strerrorcat(errbuf, errno);
	639	safefree(buf);
	640	return NULL;
	641	}
	642	/*
	643	* The first entry is the main module. The entry point
	644	* returned by load() does actually point to the data
	645	* segment origin.
	646	*/
	647	lp = (struct ld_info *)buf;
	648	ret = lp->ldinfo_dataorg;
	649	safefree(buf);
	650	return ret;
	651	}
30def704	652	#endif /* USE_NATIVE_DLOPEN */
7ca86468	653
a0d0e21e	654	/* dl_dlopen.xs
	655	*
	656	* Platform: SunOS/Solaris, possibly others which use dlopen.
0536e0eb	657	* Author: Paul Marquess (Paul.Marquess@btinternet.com)
a0d0e21e	658	* Created: 10th July 1994
	659	*
	660	* Modified:
	661	* 15th July 1994 - Added code to explicitly save any error messages.
	662	* 3rd August 1994 - Upgraded to v3 spec.
	663	* 9th August 1994 - Changed to use IV
	664	* 10th August 1994 - Tim Bunce: Added RTLD_LAZY, switchable debugging,
	665	* basic FreeBSD support, removed ClearError
	666	*
	667	*/
	668
	669	/* Porting notes:
	670
	671	see dl_dlopen.xs
	672
	673	*/
	674
	675	#include "dlutils.c" /* SaveError() etc */
	676
	677
	678	static void
cea2e8a9	679	dl_private_init(pTHX)
a0d0e21e	680	{
cea2e8a9	681	(void)dl_generic_private_init(aTHX);
a0d0e21e	682	}
	683
	684	MODULE = DynaLoader PACKAGE = DynaLoader
	685
	686	BOOT:
cea2e8a9	687	(void)dl_private_init(aTHX);
a0d0e21e	688
	689
	690	void *
ff7f3c60	691	dl_load_file(filename, flags=0)
	692	char * filename
	693	int flags
a0d0e21e	694	CODE:
bf49b057	695	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_load_file(%s,%x):\n", filename,flags));
ff7f3c60	696	if (flags & 0x01)
cea2e8a9	697	Perl_warn(aTHX_ "Can't make loaded symbols global on this platform while loading %s",filename);
30def704	698	RETVAL = dlopen(filename, RTLD_GLOBAL\|RTLD_LAZY) ;
bf49b057	699	DLDEBUG(2,PerlIO_printf(Perl_debug_log, " libref=%x\n", RETVAL));
a0d0e21e	700	ST(0) = sv_newmortal() ;
a0d0e21e	701	if (RETVAL == NULL)
cea2e8a9	702	SaveError(aTHX_ "%s",dlerror()) ;
a0d0e21e	703	else
3175b8cd	704	sv_setiv( ST(0), PTR2IV(RETVAL) );
a0d0e21e	705
7ca86468	706	int
	707	dl_unload_file(libref)
	708	void * libref
	709	CODE:
	710	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_unload_file(%lx):\n", libref));
	711	RETVAL = (dlclose(libref) == 0 ? 1 : 0);
	712	if (!RETVAL)
	713	SaveError(aTHX_ "%s", dlerror()) ;
	714	DLDEBUG(2,PerlIO_printf(Perl_debug_log, " retval = %d\n", RETVAL));
	715	OUTPUT:
	716	RETVAL
a0d0e21e	717
	718	void *
	719	dl_find_symbol(libhandle, symbolname)
	720	void * libhandle
	721	char * symbolname
	722	CODE:
bf49b057	723	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_find_symbol(handle=%x, symbol=%s)\n",
a0d0e21e	724	libhandle, symbolname));
a0d0e21e	725	RETVAL = dlsym(libhandle, symbolname);
bf49b057	726	DLDEBUG(2,PerlIO_printf(Perl_debug_log, " symbolref = %x\n", RETVAL));
a0d0e21e	727	ST(0) = sv_newmortal() ;
a0d0e21e	728	if (RETVAL == NULL)
cea2e8a9	729	SaveError(aTHX_ "%s",dlerror()) ;
a0d0e21e	730	else
f66f545a	731	sv_setiv( ST(0), PTR2IV(RETVAL));
a0d0e21e	732
	733
	734	void
	735	dl_undef_symbols()
	736	PPCODE:
	737
	738
	739
	740	# These functions should not need changing on any platform:
	741
	742	void
	743	dl_install_xsub(perl_name, symref, filename="$Package")
	744	char * perl_name
	745	void * symref
	746	char * filename
	747	CODE:
bf49b057	748	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_install_xsub(name=%s, symref=%x)\n",
a0d0e21e	749	perl_name, symref));
cea2e8a9	750	ST(0) = sv_2mortal(newRV((SV*)newXS(perl_name,
	751	(void()(pTHX_ CV ))symref,
	752	filename)));
a0d0e21e	753
	754
	755	char *
	756	dl_error()
	757	CODE:
	758	RETVAL = LastError ;
	759	OUTPUT:
	760	RETVAL
	761
	762	# end.