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 * This is an unpublished work copyright (c) 1992 Helios Software GmbH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