[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

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 * This is an unpublished work copyright (c) 1992 Helios Software GmbH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

/*
 * 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, "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;
}

/* 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;
}

/* 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, 1) ;
	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
0e06870b	14	#define PERLIO_NOT_STDIO 0
0e06870b	15
a0d0e21e	16	/*
	17	* @(#)dlfcn.c 1.5 revision of 93/02/14 20:14:17
	18	* This is an unpublished work copyright (c) 1992 Helios Software GmbH
	19	* 3000 Hannover 1, Germany
	20	*/
	21	#include "EXTERN.h"
	22	#include "perl.h"
	23	#include "XSUB.h"
	24
19e194ad	25	/* When building as a 64-bit binary on AIX, define this to get the
	26	* correct structure definitions. Also determines the field-name
	27	* macros and gates some logic in readEntries(). -- Steven N. Hirsch
	28	* <hirschs@btv.ibm.com> */
	29	#ifdef USE_64_BIT_ALL
	30	# define __XCOFF64__
	31	# define __XCOFF32__
	32	#endif
	33
a0d0e21e	34	#include <stdio.h>
	35	#include <errno.h>
	36	#include <string.h>
	37	#include <stdlib.h>
	38	#include <sys/types.h>
	39	#include <sys/ldr.h>
	40	#include <a.out.h>
ee8c7f54	41	#undef FREAD
ee8c7f54	42	#undef FWRITE
a0d0e21e	43	#include <ldfcn.h>
a0d0e21e	44
19e194ad	45	#ifdef USE_64_BIT_ALL
	46	# define AIX_SCNHDR SCNHDR_64
	47	# define AIX_LDHDR LDHDR_64
	48	# define AIX_LDSYM LDSYM_64
	49	# define AIX_LDHDRSZ LDHDRSZ_64
	50	#else
	51	# define AIX_SCNHDR SCNHDR
	52	# define AIX_LDHDR LDHDR
	53	# define AIX_LDSYM LDSYM
	54	# define AIX_LDHDRSZ LDHDRSZ
	55	#endif
	56
4e774c84	57	/* When using Perl extensions written in C++ the longer versions
	58	* of load() and unload() from libC and libC_r need to be used,
	59	* otherwise statics in the extensions won't get initialized right.
	60	* -- Stephanie Beals <bealzy@us.ibm.com> */
bab3591f	61
	62	/* Older AIX C compilers cannot deal with C++ double-slash comments in
	63	the ibmcxx and/or xlC includes. Since we only need a single file,
	64	be more fine-grained about what's included <hirschs@btv.ibm.com> */
c88be79f	65	#ifdef USE_libC /* The define comes, when it comes, from hints/aix.pl. */
c88be79f	66	# define LOAD loadAndInit
4e774c84	67	# define UNLOAD terminateAndUnload
bab3591f	68	# if defined(USE_xlC_load_h)
	69	# include "/usr/lpp/xlC/include/load.h"
	70	# elif defined(USE_ibmcxx_load_h)
	71	# include "/usr/ibmcxx/include/load.h"
c88be79f	72	# endif
4e774c84	73	#else
	74	# define LOAD load
	75	# define UNLOAD unload
	76	#endif
	77
ee580363	78	/*
	79	* AIX 4.3 does remove some useful definitions from ldfcn.h. Define
	80	* these here to compensate for that lossage.
	81	*/
	82	#ifndef BEGINNING
	83	# define BEGINNING SEEK_SET
	84	#endif
	85	#ifndef FSEEK
	86	# define FSEEK(ldptr,o,p) fseek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr) +o):o,p)
	87	#endif
	88	#ifndef FREAD
	89	# define FREAD(p,s,n,ldptr) fread(p,s,n,IOPTR(ldptr))
	90	#endif
	91
a0d0e21e	92	/*
	93	* We simulate dlopen() et al. through a call to load. Because AIX has
	94	* no call to find an exported symbol we read the loader section of the
	95	* loaded module and build a list of exported symbols and their virtual
	96	* address.
	97	*/
	98
	99	typedef struct {
	100	char name; / the symbols's name */
	101	void addr; / its relocated virtual address */
	102	} Export, *ExportPtr;
	103
	104	/*
	105	* The void * handle returned from dlopen is actually a ModulePtr.
	106	*/
	107	typedef struct Module {
	108	struct Module *next;
	109	char name; / module name for refcounting */
	110	int refCnt; /* the number of references */
	111	void entry; / entry point from load */
	112	int nExports; /* the number of exports found */
	113	ExportPtr exports; /* the array of exports */
	114	} Module, *ModulePtr;
	115
	116	/*
ee8c7f54	117	* We keep a list of all loaded modules to be able to reference count
ee8c7f54	118	* duplicate dlopen's.
a0d0e21e	119	*/
549a6b10	120	static ModulePtr modList; /* XXX threaded */
a0d0e21e	121
	122	/*
	123	* The last error from one of the dl* routines is kept in static
	124	* variables here. Each error is returned only once to the caller.
	125	*/
549a6b10	126	static char errbuf[BUFSIZ]; /* XXX threaded */
549a6b10	127	static int errvalid; /* XXX threaded */
a0d0e21e	128
	129	static void caterr(char *);
	130	static int readExports(ModulePtr);
ee8c7f54	131	static void *findMain(void);
a0d0e21e	132
ce637636	133	static char *strerror_failed = "(strerror failed)";
	134	static char *strerror_r_failed = "(strerror_r failed)";
	135
fd206186	136	char strerrorcat(char str, int err) {
ce637636	137	int strsiz = strlen(str);
	138	int msgsiz;
	139	char *msg;
	140
	141	#ifdef USE_THREADS
	142	char *buf = malloc(BUFSIZ);
	143
	144	if (buf == 0)
	145	return 0;
549a6b10	146	if (strerror_r(err, buf, BUFSIZ) == 0)
ce637636	147	msg = buf;
	148	else
	149	msg = strerror_r_failed;
	150	msgsiz = strlen(msg);
	151	if (strsiz + msgsiz < BUFSIZ)
	152	strcat(str, msg);
	153	free(buf);
	154	#else
	155	if ((msg = strerror(err)) == 0)
	156	msg = strerror_failed;
	157	msgsiz = strlen(msg); /* Note msg = buf and free() above. */
	158	if (strsiz + msgsiz < BUFSIZ) /* Do not move this after #endif. */
	159	strcat(str, msg);
	160	#endif
	161
fd206186	162	return str;
fd206186	163	}
ce637636	164
fd206186	165	char strerrorcpy(char str, int err) {
ce637636	166	int msgsiz;
	167	char *msg;
	168
	169	#ifdef USE_THREADS
	170	char *buf = malloc(BUFSIZ);
	171
	172	if (buf == 0)
	173	return 0;
549a6b10	174	if (strerror_r(err, buf, BUFSIZ) == 0)
ce637636	175	msg = buf;
	176	else
	177	msg = strerror_r_failed;
	178	msgsiz = strlen(msg);
	179	if (msgsiz < BUFSIZ)
	180	strcpy(str, msg);
	181	free(buf);
	182	#else
	183	if ((msg = strerror(err)) == 0)
	184	msg = strerror_failed;
	185	msgsiz = strlen(msg); /* Note msg = buf and free() above. */
	186	if (msgsiz < BUFSIZ) /* Do not move this after #endif. */
	187	strcpy(str, msg);
	188	#endif
	189
fd206186	190	return str;
fd206186	191	}
a0d0e21e	192
	193	/* ARGSUSED */
	194	void dlopen(char path, int mode)
	195	{
5b877257	196	dTHX;
a0d0e21e	197	register ModulePtr mp;
ee8c7f54	198	static void mainModule; / XXX threaded */
a0d0e21e	199
	200	/*
	201	* Upon the first call register a terminate handler that will
f6b3007c	202	* close all libraries.
a0d0e21e	203	*/
ee8c7f54	204	if (mainModule == NULL) {
	205	if ((mainModule = findMain()) == NULL)
	206	return NULL;
a0d0e21e	207	}
	208	/*
	209	* Scan the list of modules if have the module already loaded.
	210	*/
	211	for (mp = modList; mp; mp = mp->next)
	212	if (strcmp(mp->name, path) == 0) {
	213	mp->refCnt++;
	214	return mp;
	215	}
	216	Newz(1000,mp,1,Module);
	217	if (mp == NULL) {
	218	errvalid++;
	219	strcpy(errbuf, "Newz: ");
fd206186	220	strerrorcat(errbuf, errno);
a0d0e21e	221	return NULL;
	222	}
	223
	224	if ((mp->name = savepv(path)) == NULL) {
	225	errvalid++;
	226	strcpy(errbuf, "savepv: ");
fd206186	227	strerrorcat(errbuf, errno);
a0d0e21e	228	safefree(mp);
	229	return NULL;
	230	}
549a6b10	231
a0d0e21e	232	/*
	233	* load should be declared load(const char *...). Thus we
	234	* cast the path to a normal char *. Ugly.
	235	*/
4e774c84	236	if ((mp->entry = (void )LOAD((char )path,
549a6b10	237	#ifdef L_LIBPATH_EXEC
	238	L_LIBPATH_EXEC \|
	239	#endif
	240	L_NOAUTODEFER,
	241	NULL)) == NULL) {
	242	int saverrno = errno;
	243
a0d0e21e	244	safefree(mp->name);
	245	safefree(mp);
	246	errvalid++;
	247	strcpy(errbuf, "dlopen: ");
	248	strcat(errbuf, path);
	249	strcat(errbuf, ": ");
	250	/*
	251	* If AIX says the file is not executable, the error
	252	* can be further described by querying the loader about
	253	* the last error.
	254	*/
549a6b10	255	if (saverrno == ENOEXEC) {
	256	char moreinfo[BUFSIZ/sizeof(char )];
	257	if (loadquery(L_GETMESSAGES, moreinfo, sizeof(moreinfo)) == -1)
	258	strerrorcpy(errbuf, saverrno);
a0d0e21e	259	else {
a0d0e21e	260	char **p;
549a6b10	261	for (p = moreinfo; *p; p++)
a0d0e21e	262	caterr(*p);
	263	}
	264	} else
549a6b10	265	strerrorcat(errbuf, saverrno);
a0d0e21e	266	return NULL;
	267	}
	268	mp->refCnt = 1;
	269	mp->next = modList;
	270	modList = mp;
f6b3007c	271	/*
	272	* Assume anonymous exports come from the module this dlopen
	273	* is linked into, that holds true as long as dlopen and all
ee8c7f54	274	* of the perl core are in the same shared object. Also bind
	275	* against the main part, in the case a perl is not the main
	276	* part, e.g mod_perl as DSO in Apache so perl modules can
	277	* also reference Apache symbols.
f6b3007c	278	*/
ee8c7f54	279	if (loadbind(0, (void *)dlopen, mp->entry) == -1 \|\|
ee8c7f54	280	loadbind(0, mainModule, mp->entry)) {
549a6b10	281	int saverrno = errno;
549a6b10	282
a0d0e21e	283	dlclose(mp);
	284	errvalid++;
	285	strcpy(errbuf, "loadbind: ");
549a6b10	286	strerrorcat(errbuf, saverrno);
a0d0e21e	287	return NULL;
	288	}
	289	if (readExports(mp) == -1) {
	290	dlclose(mp);
	291	return NULL;
	292	}
	293	return mp;
	294	}
	295
	296	/*
	297	* Attempt to decipher an AIX loader error message and append it
	298	* to our static error message buffer.
	299	*/
	300	static void caterr(char *s)
	301	{
	302	register char *p = s;
	303
	304	while (p >= '0' && p <= '9')
	305	p++;
	306	switch(atoi(s)) {
	307	case L_ERROR_TOOMANY:
	308	strcat(errbuf, "to many errors");
	309	break;
	310	case L_ERROR_NOLIB:
	311	strcat(errbuf, "can't load library");
	312	strcat(errbuf, p);
	313	break;
	314	case L_ERROR_UNDEF:
	315	strcat(errbuf, "can't find symbol");
	316	strcat(errbuf, p);
	317	break;
	318	case L_ERROR_RLDBAD:
	319	strcat(errbuf, "bad RLD");
	320	strcat(errbuf, p);
	321	break;
	322	case L_ERROR_FORMAT:
	323	strcat(errbuf, "bad exec format in");
	324	strcat(errbuf, p);
	325	break;
	326	case L_ERROR_ERRNO:
fd206186	327	strerrorcat(errbuf, atoi(++p));
a0d0e21e	328	break;
	329	default:
	330	strcat(errbuf, s);
	331	break;
	332	}
	333	}
	334
	335	void dlsym(void handle, const char *symbol)
	336	{
	337	register ModulePtr mp = (ModulePtr)handle;
	338	register ExportPtr ep;
	339	register int i;
	340
	341	/*
	342	* Could speed up search, but I assume that one assigns
	343	* the result to function pointers anyways.
	344	*/
	345	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
	346	if (strcmp(ep->name, symbol) == 0)
	347	return ep->addr;
	348	errvalid++;
	349	strcpy(errbuf, "dlsym: undefined symbol ");
	350	strcat(errbuf, symbol);
	351	return NULL;
	352	}
	353
	354	char *dlerror(void)
	355	{
	356	if (errvalid) {
	357	errvalid = 0;
	358	return errbuf;
	359	}
	360	return NULL;
	361	}
	362
	363	int dlclose(void *handle)
	364	{
	365	register ModulePtr mp = (ModulePtr)handle;
	366	int result;
	367	register ModulePtr mp1;
	368
	369	if (--mp->refCnt > 0)
	370	return 0;
4e774c84	371	result = UNLOAD(mp->entry);
a0d0e21e	372	if (result == -1) {
a0d0e21e	373	errvalid++;
fd206186	374	strerrorcpy(errbuf, errno);
a0d0e21e	375	}
	376	if (mp->exports) {
	377	register ExportPtr ep;
	378	register int i;
	379	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
	380	if (ep->name)
	381	safefree(ep->name);
	382	safefree(mp->exports);
	383	}
	384	if (mp == modList)
	385	modList = mp->next;
	386	else {
	387	for (mp1 = modList; mp1; mp1 = mp1->next)
	388	if (mp1->next == mp) {
	389	mp1->next = mp->next;
	390	break;
	391	}
	392	}
	393	safefree(mp->name);
	394	safefree(mp);
	395	return result;
	396	}
	397
a0d0e21e	398	/* Added by Wayne Scott
	399	* This is needed because the ldopen system call calls
	400	* calloc to allocated a block of date. The ldclose call calls free.
	401	* Without this we get this system calloc and perl's free, resulting
	402	* in a "Bad free" message. This way we always use perl's malloc.
	403	*/
	404	void *calloc(size_t ne, size_t sz)
	405	{
	406	void *out;
	407
	408	out = (void ) safemalloc(nesz);
	409	memzero(out, ne*sz);
	410	return(out);
	411	}
	412
	413	/*
	414	* Build the export table from the XCOFF .loader section.
	415	*/
	416	static int readExports(ModulePtr mp)
	417	{
5b877257	418	dTHX;
a0d0e21e	419	LDFILE *ldp = NULL;
19e194ad	420	AIX_SCNHDR sh;
19e194ad	421	AIX_LDHDR *lhp;
a0d0e21e	422	char *ldbuf;
19e194ad	423	AIX_LDSYM *ls;
a0d0e21e	424	int i;
	425	ExportPtr ep;
	426
	427	if ((ldp = ldopen(mp->name, ldp)) == NULL) {
	428	struct ld_info *lp;
	429	char *buf;
	430	int size = 4*1024;
	431	if (errno != ENOENT) {
	432	errvalid++;
	433	strcpy(errbuf, "readExports: ");
fd206186	434	strerrorcat(errbuf, errno);
a0d0e21e	435	return -1;
	436	}
	437	/*
	438	* The module might be loaded due to the LIBPATH
	439	* environment variable. Search for the loaded
	440	* module using L_GETINFO.
	441	*/
	442	if ((buf = safemalloc(size)) == NULL) {
	443	errvalid++;
	444	strcpy(errbuf, "readExports: ");
fd206186	445	strerrorcat(errbuf, errno);
a0d0e21e	446	return -1;
	447	}
	448	while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
	449	safefree(buf);
	450	size += 4*1024;
	451	if ((buf = safemalloc(size)) == NULL) {
	452	errvalid++;
	453	strcpy(errbuf, "readExports: ");
fd206186	454	strerrorcat(errbuf, errno);
a0d0e21e	455	return -1;
	456	}
	457	}
	458	if (i == -1) {
	459	errvalid++;
	460	strcpy(errbuf, "readExports: ");
fd206186	461	strerrorcat(errbuf, errno);
a0d0e21e	462	safefree(buf);
	463	return -1;
	464	}
	465	/*
	466	* Traverse the list of loaded modules. The entry point
4e774c84	467	* returned by LOAD() does actually point to the data
a0d0e21e	468	* segment origin.
	469	*/
	470	lp = (struct ld_info *)buf;
	471	while (lp) {
	472	if (lp->ldinfo_dataorg == mp->entry) {
	473	ldp = ldopen(lp->ldinfo_filename, ldp);
	474	break;
	475	}
	476	if (lp->ldinfo_next == 0)
	477	lp = NULL;
	478	else
	479	lp = (struct ld_info )((char )lp + lp->ldinfo_next);
	480	}
	481	safefree(buf);
	482	if (!ldp) {
	483	errvalid++;
	484	strcpy(errbuf, "readExports: ");
fd206186	485	strerrorcat(errbuf, errno);
a0d0e21e	486	return -1;
	487	}
	488	}
19e194ad	489	#ifdef USE_64_BIT_ALL
	490	if (TYPE(ldp) != U803XTOCMAGIC) {
	491	#else
a0d0e21e	492	if (TYPE(ldp) != U802TOCMAGIC) {
19e194ad	493	#endif
a0d0e21e	494	errvalid++;
	495	strcpy(errbuf, "readExports: bad magic");
	496	while(ldclose(ldp) == FAILURE)
	497	;
	498	return -1;
	499	}
	500	if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
	501	errvalid++;
	502	strcpy(errbuf, "readExports: cannot read loader section header");
	503	while(ldclose(ldp) == FAILURE)
	504	;
	505	return -1;
	506	}
	507	/*
	508	* We read the complete loader section in one chunk, this makes
	509	* finding long symbol names residing in the string table easier.
	510	*/
	511	if ((ldbuf = (char *)safemalloc(sh.s_size)) == NULL) {
	512	errvalid++;
	513	strcpy(errbuf, "readExports: ");
fd206186	514	strerrorcat(errbuf, errno);
a0d0e21e	515	while(ldclose(ldp) == FAILURE)
	516	;
	517	return -1;
	518	}
	519	if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
	520	errvalid++;
	521	strcpy(errbuf, "readExports: cannot seek to loader section");
	522	safefree(ldbuf);
	523	while(ldclose(ldp) == FAILURE)
	524	;
	525	return -1;
	526	}
1553ab04	527	/* This first case is a hack, since it assumes that the 3rd parameter to
1553ab04	528	FREAD is 1. See the redefinition of FREAD above to see how this works. */
a0d0e21e	529	if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
	530	errvalid++;
	531	strcpy(errbuf, "readExports: cannot read loader section");
	532	safefree(ldbuf);
	533	while(ldclose(ldp) == FAILURE)
	534	;
	535	return -1;
	536	}
19e194ad	537	lhp = (AIX_LDHDR *)ldbuf;
19e194ad	538	ls = (AIX_LDSYM *)(ldbuf+AIX_LDHDRSZ);
a0d0e21e	539	/*
	540	* Count the number of exports to include in our export table.
	541	*/
	542	for (i = lhp->l_nsyms; i; i--, ls++) {
	543	if (!LDR_EXPORT(*ls))
	544	continue;
	545	mp->nExports++;
	546	}
	547	Newz(1001, mp->exports, mp->nExports, Export);
	548	if (mp->exports == NULL) {
	549	errvalid++;
	550	strcpy(errbuf, "readExports: ");
fd206186	551	strerrorcat(errbuf, errno);
a0d0e21e	552	safefree(ldbuf);
	553	while(ldclose(ldp) == FAILURE)
	554	;
	555	return -1;
	556	}
	557	/*
	558	* Fill in the export table. All entries are relative to
	559	* the entry point we got from load.
	560	*/
	561	ep = mp->exports;
19e194ad	562	ls = (AIX_LDSYM *)(ldbuf+AIX_LDHDRSZ);
a0d0e21e	563	for (i = lhp->l_nsyms; i; i--, ls++) {
	564	char *symname;
	565	if (!LDR_EXPORT(*ls))
	566	continue;
19e194ad	567	#ifndef USE_64_BIT_ALL
a0d0e21e	568	if (ls->l_zeroes == 0)
19e194ad	569	#endif
a0d0e21e	570	symname = ls->l_offset+lhp->l_stoff+ldbuf;
19e194ad	571	#ifndef USE_64_BIT_ALL
a0d0e21e	572	else
a0d0e21e	573	symname = ls->l_name;
19e194ad	574	#endif
a0d0e21e	575	ep->name = savepv(symname);
	576	ep->addr = (void *)((unsigned long)mp->entry + ls->l_value);
	577	ep++;
	578	}
	579	safefree(ldbuf);
	580	while(ldclose(ldp) == FAILURE)
	581	;
	582	return 0;
	583	}
	584
ee8c7f54	585	/*
	586	* Find the main modules entry point. This is used as export pointer
	587	* for loadbind() to be able to resolve references to the main part.
	588	*/
	589	static void * findMain(void)
	590	{
	591	struct ld_info *lp;
	592	char *buf;
	593	int size = 4*1024;
	594	int i;
	595	void *ret;
	596
	597	if ((buf = safemalloc(size)) == NULL) {
	598	errvalid++;
	599	strcpy(errbuf, "findMain: ");
	600	strerrorcat(errbuf, errno);
	601	return NULL;
	602	}
	603	while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
	604	safefree(buf);
	605	size += 4*1024;
	606	if ((buf = safemalloc(size)) == NULL) {
	607	errvalid++;
	608	strcpy(errbuf, "findMain: ");
	609	strerrorcat(errbuf, errno);
	610	return NULL;
	611	}
	612	}
	613	if (i == -1) {
	614	errvalid++;
	615	strcpy(errbuf, "findMain: ");
	616	strerrorcat(errbuf, errno);
	617	safefree(buf);
	618	return NULL;
	619	}
	620	/*
	621	* The first entry is the main module. The entry point
	622	* returned by load() does actually point to the data
	623	* segment origin.
	624	*/
	625	lp = (struct ld_info *)buf;
	626	ret = lp->ldinfo_dataorg;
	627	safefree(buf);
	628	return ret;
	629	}
	630
a0d0e21e	631	/* dl_dlopen.xs
	632	*
	633	* Platform: SunOS/Solaris, possibly others which use dlopen.
0536e0eb	634	* Author: Paul Marquess (Paul.Marquess@btinternet.com)
a0d0e21e	635	* Created: 10th July 1994
	636	*
	637	* Modified:
	638	* 15th July 1994 - Added code to explicitly save any error messages.
	639	* 3rd August 1994 - Upgraded to v3 spec.
	640	* 9th August 1994 - Changed to use IV
	641	* 10th August 1994 - Tim Bunce: Added RTLD_LAZY, switchable debugging,
	642	* basic FreeBSD support, removed ClearError
	643	*
	644	*/
	645
	646	/* Porting notes:
	647
	648	see dl_dlopen.xs
	649
	650	*/
	651
	652	#include "dlutils.c" /* SaveError() etc */
	653
	654
	655	static void
cea2e8a9	656	dl_private_init(pTHX)
a0d0e21e	657	{
cea2e8a9	658	(void)dl_generic_private_init(aTHX);
a0d0e21e	659	}
	660
	661	MODULE = DynaLoader PACKAGE = DynaLoader
	662
	663	BOOT:
cea2e8a9	664	(void)dl_private_init(aTHX);
a0d0e21e	665
	666
	667	void *
ff7f3c60	668	dl_load_file(filename, flags=0)
	669	char * filename
	670	int flags
a0d0e21e	671	CODE:
bf49b057	672	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_load_file(%s,%x):\n", filename,flags));
ff7f3c60	673	if (flags & 0x01)
cea2e8a9	674	Perl_warn(aTHX_ "Can't make loaded symbols global on this platform while loading %s",filename);
a0d0e21e	675	RETVAL = dlopen(filename, 1) ;
bf49b057	676	DLDEBUG(2,PerlIO_printf(Perl_debug_log, " libref=%x\n", RETVAL));
a0d0e21e	677	ST(0) = sv_newmortal() ;
a0d0e21e	678	if (RETVAL == NULL)
cea2e8a9	679	SaveError(aTHX_ "%s",dlerror()) ;
a0d0e21e	680	else
3175b8cd	681	sv_setiv( ST(0), PTR2IV(RETVAL) );
a0d0e21e	682
ee8c7f54	683	int
	684	dl_unload_file(libref)
	685	void * libref
	686	CODE:
	687	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_unload_file(%lx):\n", libref));
	688	RETVAL = (dlclose(libref) == 0 ? 1 : 0);
	689	if (!RETVAL)
	690	SaveError(aTHX_ "%s", dlerror()) ;
	691	DLDEBUG(2,PerlIO_printf(Perl_debug_log, " retval = %d\n", RETVAL));
	692	OUTPUT:
	693	RETVAL
a0d0e21e	694
	695	void *
	696	dl_find_symbol(libhandle, symbolname)
	697	void * libhandle
	698	char * symbolname
	699	CODE:
bf49b057	700	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_find_symbol(handle=%x, symbol=%s)\n",
a0d0e21e	701	libhandle, symbolname));
a0d0e21e	702	RETVAL = dlsym(libhandle, symbolname);
bf49b057	703	DLDEBUG(2,PerlIO_printf(Perl_debug_log, " symbolref = %x\n", RETVAL));
a0d0e21e	704	ST(0) = sv_newmortal() ;
a0d0e21e	705	if (RETVAL == NULL)
cea2e8a9	706	SaveError(aTHX_ "%s",dlerror()) ;
a0d0e21e	707	else
f66f545a	708	sv_setiv( ST(0), PTR2IV(RETVAL));
a0d0e21e	709
	710
	711	void
	712	dl_undef_symbols()
	713	PPCODE:
	714
	715
	716
	717	# These functions should not need changing on any platform:
	718
	719	void
	720	dl_install_xsub(perl_name, symref, filename="$Package")
	721	char * perl_name
	722	void * symref
	723	char * filename
	724	CODE:
bf49b057	725	DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_install_xsub(name=%s, symref=%x)\n",
a0d0e21e	726	perl_name, symref));
cea2e8a9	727	ST(0) = sv_2mortal(newRV((SV*)newXS(perl_name,
	728	(void()(pTHX_ CV ))symref,
	729	filename)));
a0d0e21e	730
	731
	732	char *
	733	dl_error()
	734	CODE:
	735	RETVAL = LastError ;
	736	OUTPUT:
	737	RETVAL
	738
	739	# end.