[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.
 */

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 * This is an unpublished work copyright (c) 1992 Helios Software GmbH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

/* 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> */
#ifdef USE_libC /* The define comes, when it comes, from hints/aix.pl. */
#   define LOAD   loadAndInit
#   define UNLOAD terminateAndUnload
#   ifdef USE_load_h
#       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

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

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

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

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

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

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

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

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

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

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

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

    return str;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

/* Porting notes:

	see dl_dlopen.xs

*/

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


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

BOOT:
    (void)dl_private_init(aTHX);


void *
dl_load_file(filename, flags=0)
	char *	filename
	int	flags
	CODE:
	DLDEBUG(1,PerlIO_printf(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) );


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