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 * This is an unpublished work copyright (c) 1992 Helios Software GmbH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

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

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

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

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

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

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

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

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

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

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

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

    return str;
}

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

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

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

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

	/*
	 * Upon the first call register a terminate handler that will
	 * close all libraries. Also get a reference to the main module
	 * for use with loadbind.
	 */
	if (!mainModule) {
		if ((mainModule = findMain()) == NULL)
			return NULL;
		atexit(terminate);
	}
	/*
	 * Scan the list of modules if have the module already loaded.
	 */
	for (mp = modList; mp; mp = mp->next)
		if (strcmp(mp->name, path) == 0) {
			mp->refCnt++;
			return mp;
		}
	Newz(1000,mp,1,Module);
	if (mp == NULL) {
		errvalid++;
		strcpy(errbuf, "Newz: ");
		strerrorcat(errbuf, errno);
		return NULL;
	}
	
	if ((mp->name = savepv(path)) == NULL) {
		errvalid++;
		strcpy(errbuf, "savepv: ");
		strerrorcat(errbuf, errno);
		safefree(mp);
		return NULL;
	}
	/*
	 * load should be declared load(const char *...). Thus we
	 * cast the path to a normal char *. Ugly.
	 */
	if ((mp->entry = (void *)load((char *)path, L_NOAUTODEFER, NULL)) == NULL) {
		safefree(mp->name);
		safefree(mp);
		errvalid++;
		strcpy(errbuf, "dlopen: ");
		strcat(errbuf, path);
		strcat(errbuf, ": ");
		/*
		 * If AIX says the file is not executable, the error
		 * can be further described by querying the loader about
		 * the last error.
		 */
		if (errno == ENOEXEC) {
			char *tmp[BUFSIZ/sizeof(char *)];
			if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1)
				strerrorcpy(errbuf, errno);
			else {
				char **p;
				for (p = tmp; *p; p++)
					caterr(*p);
			}
		} else
			strerrorcat(errbuf, errno);
		return NULL;
	}
	mp->refCnt = 1;
	mp->next = modList;
	modList = mp;
	if (loadbind(0, mainModule, mp->entry) == -1) {
		dlclose(mp);
		errvalid++;
		strcpy(errbuf, "loadbind: ");
		strerrorcat(errbuf, errno);
		return NULL;
	}
	if (readExports(mp) == -1) {
		dlclose(mp);
		return NULL;
	}
	return mp;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

/* Porting notes:

	see dl_dlopen.xs

*/

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


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

BOOT:
    (void)dl_private_init();


void *
dl_load_file(filename, flags=0)
	char *	filename
	int	flags
	CODE:
	DLDEBUG(1,PerlIO_printf(PerlIO_stderr(), "dl_load_file(%s,%x):\n", filename,flags));
	if (flags & 0x01)
	    warn("Can't make loaded symbols global on this platform while loading %s",filename);
	RETVAL = dlopen(filename, 1) ;
	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " libref=%x\n", RETVAL));
	ST(0) = sv_newmortal() ;
	if (RETVAL == NULL)
	    SaveError("%s",dlerror()) ;
	else
	    sv_setiv( ST(0), (IV)RETVAL);


void *
dl_find_symbol(libhandle, symbolname)
	void *		libhandle
	char *		symbolname
	CODE:
	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_find_symbol(handle=%x, symbol=%s)\n",
		libhandle, symbolname));
	RETVAL = dlsym(libhandle, symbolname);
	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "  symbolref = %x\n", RETVAL));
	ST(0) = sv_newmortal() ;
	if (RETVAL == NULL)
	    SaveError("%s",dlerror()) ;
	else
	    sv_setiv( ST(0), (IV)RETVAL);


void
dl_undef_symbols()
	PPCODE:


# These functions should not need changing on any platform:

void
dl_install_xsub(perl_name, symref, filename="$Package")
    char *	perl_name
    void *	symref 
    char *	filename
    CODE:
    DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_install_xsub(name=%s, symref=%x)\n",
	perl_name, symref));
    ST(0)=sv_2mortal(newRV((SV*)newXS(perl_name, (void(*)())symref, filename)));


char *
dl_error()
    CODE:
    RETVAL = LastError ;
    OUTPUT:
    RETVAL

# end.
Commit	Line	Data
a0d0e21e	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
1553ab04	32	/* If using PerlIO, redefine these macros from <ldfcn.h> */
	33	#ifdef USE_PERLIO
	34	#define FSEEK(ldptr,o,p) PerlIO_seek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr)+o):o,p)
	35	#define FREAD(p,s,n,ldptr) PerlIO_read(IOPTR(ldptr),p,s*n)
	36	#endif
	37
a0d0e21e	38	/*
	39	* We simulate dlopen() et al. through a call to load. Because AIX has
	40	* no call to find an exported symbol we read the loader section of the
	41	* loaded module and build a list of exported symbols and their virtual
	42	* address.
	43	*/
	44
	45	typedef struct {
	46	char name; / the symbols's name */
	47	void addr; / its relocated virtual address */
	48	} Export, *ExportPtr;
	49
	50	/*
	51	* The void * handle returned from dlopen is actually a ModulePtr.
	52	*/
	53	typedef struct Module {
	54	struct Module *next;
	55	char name; / module name for refcounting */
	56	int refCnt; /* the number of references */
	57	void entry; / entry point from load */
	58	int nExports; /* the number of exports found */
	59	ExportPtr exports; /* the array of exports */
	60	} Module, *ModulePtr;
	61
	62	/*
	63	* We keep a list of all loaded modules to be able to call the fini
	64	* handlers at atexit() time.
	65	*/
	66	static ModulePtr modList;
	67
	68	/*
	69	* The last error from one of the dl* routines is kept in static
	70	* variables here. Each error is returned only once to the caller.
	71	*/
	72	static char errbuf[BUFSIZ];
	73	static int errvalid;
	74
	75	static void caterr(char *);
	76	static int readExports(ModulePtr);
	77	static void terminate(void);
	78	static void *findMain(void);
	79
ce637636	80	static char *strerror_failed = "(strerror failed)";
	81	static char *strerror_r_failed = "(strerror_r failed)";
	82
fd206186	83	char strerrorcat(char str, int err) {
ce637636	84	int strsiz = strlen(str);
	85	int msgsiz;
	86	char *msg;
	87
	88	#ifdef USE_THREADS
	89	char *buf = malloc(BUFSIZ);
	90
	91	if (buf == 0)
	92	return 0;
	93	if (strerror_r(err, buf, sizeof(buf)) == 0)
	94	msg = buf;
	95	else
	96	msg = strerror_r_failed;
	97	msgsiz = strlen(msg);
	98	if (strsiz + msgsiz < BUFSIZ)
	99	strcat(str, msg);
	100	free(buf);
	101	#else
	102	if ((msg = strerror(err)) == 0)
	103	msg = strerror_failed;
	104	msgsiz = strlen(msg); /* Note msg = buf and free() above. */
	105	if (strsiz + msgsiz < BUFSIZ) /* Do not move this after #endif. */
	106	strcat(str, msg);
	107	#endif
	108
fd206186	109	return str;
fd206186	110	}
ce637636	111
fd206186	112	char strerrorcpy(char str, int err) {
ce637636	113	int msgsiz;
	114	char *msg;
	115
	116	#ifdef USE_THREADS
	117	char *buf = malloc(BUFSIZ);
	118
	119	if (buf == 0)
	120	return 0;
	121	if (strerror_r(err, buf, sizeof(buf)) == 0)
	122	msg = buf;
	123	else
	124	msg = strerror_r_failed;
	125	msgsiz = strlen(msg);
	126	if (msgsiz < BUFSIZ)
	127	strcpy(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 (msgsiz < BUFSIZ) /* Do not move this after #endif. */
	134	strcpy(str, msg);
	135	#endif
	136
fd206186	137	return str;
fd206186	138	}
a0d0e21e	139
	140	/* ARGSUSED */
	141	void dlopen(char path, int mode)
	142	{
	143	register ModulePtr mp;
	144	static void *mainModule;
	145
	146	/*
	147	* Upon the first call register a terminate handler that will
	148	* close all libraries. Also get a reference to the main module
	149	* for use with loadbind.
	150	*/
	151	if (!mainModule) {
	152	if ((mainModule = findMain()) == NULL)
	153	return NULL;
	154	atexit(terminate);
	155	}
	156	/*
	157	* Scan the list of modules if have the module already loaded.
	158	*/
	159	for (mp = modList; mp; mp = mp->next)
	160	if (strcmp(mp->name, path) == 0) {
	161	mp->refCnt++;
	162	return mp;
	163	}
	164	Newz(1000,mp,1,Module);
	165	if (mp == NULL) {
	166	errvalid++;
	167	strcpy(errbuf, "Newz: ");
fd206186	168	strerrorcat(errbuf, errno);
a0d0e21e	169	return NULL;
	170	}
	171
	172	if ((mp->name = savepv(path)) == NULL) {
	173	errvalid++;
	174	strcpy(errbuf, "savepv: ");
fd206186	175	strerrorcat(errbuf, errno);
a0d0e21e	176	safefree(mp);
	177	return NULL;
	178	}
	179	/*
	180	* load should be declared load(const char *...). Thus we
	181	* cast the path to a normal char *. Ugly.
	182	*/
	183	if ((mp->entry = (void )load((char )path, L_NOAUTODEFER, NULL)) == NULL) {
	184	safefree(mp->name);
	185	safefree(mp);
	186	errvalid++;
	187	strcpy(errbuf, "dlopen: ");
	188	strcat(errbuf, path);
	189	strcat(errbuf, ": ");
	190	/*
	191	* If AIX says the file is not executable, the error
	192	* can be further described by querying the loader about
	193	* the last error.
	194	*/
	195	if (errno == ENOEXEC) {
	196	char tmp[BUFSIZ/sizeof(char )];
	197	if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1)
fd206186	198	strerrorcpy(errbuf, errno);
a0d0e21e	199	else {
	200	char **p;
	201	for (p = tmp; *p; p++)
	202	caterr(*p);
	203	}
	204	} else
fd206186	205	strerrorcat(errbuf, errno);
a0d0e21e	206	return NULL;
	207	}
	208	mp->refCnt = 1;
	209	mp->next = modList;
	210	modList = mp;
	211	if (loadbind(0, mainModule, mp->entry) == -1) {
	212	dlclose(mp);
	213	errvalid++;
	214	strcpy(errbuf, "loadbind: ");
fd206186	215	strerrorcat(errbuf, errno);
a0d0e21e	216	return NULL;
	217	}
	218	if (readExports(mp) == -1) {
	219	dlclose(mp);
	220	return NULL;
	221	}
	222	return mp;
	223	}
	224
	225	/*
	226	* Attempt to decipher an AIX loader error message and append it
	227	* to our static error message buffer.
	228	*/
	229	static void caterr(char *s)
	230	{
	231	register char *p = s;
	232
	233	while (p >= '0' && p <= '9')
	234	p++;
	235	switch(atoi(s)) {
	236	case L_ERROR_TOOMANY:
	237	strcat(errbuf, "to many errors");
	238	break;
	239	case L_ERROR_NOLIB:
	240	strcat(errbuf, "can't load library");
	241	strcat(errbuf, p);
	242	break;
	243	case L_ERROR_UNDEF:
	244	strcat(errbuf, "can't find symbol");
	245	strcat(errbuf, p);
	246	break;
	247	case L_ERROR_RLDBAD:
	248	strcat(errbuf, "bad RLD");
	249	strcat(errbuf, p);
	250	break;
	251	case L_ERROR_FORMAT:
	252	strcat(errbuf, "bad exec format in");
	253	strcat(errbuf, p);
	254	break;
	255	case L_ERROR_ERRNO:
fd206186	256	strerrorcat(errbuf, atoi(++p));
a0d0e21e	257	break;
	258	default:
	259	strcat(errbuf, s);
	260	break;
	261	}
	262	}
	263
	264	void dlsym(void handle, const char *symbol)
	265	{
	266	register ModulePtr mp = (ModulePtr)handle;
	267	register ExportPtr ep;
	268	register int i;
	269
	270	/*
	271	* Could speed up search, but I assume that one assigns
	272	* the result to function pointers anyways.
	273	*/
	274	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
	275	if (strcmp(ep->name, symbol) == 0)
	276	return ep->addr;
	277	errvalid++;
	278	strcpy(errbuf, "dlsym: undefined symbol ");
	279	strcat(errbuf, symbol);
	280	return NULL;
	281	}
	282
	283	char *dlerror(void)
	284	{
	285	if (errvalid) {
	286	errvalid = 0;
	287	return errbuf;
	288	}
	289	return NULL;
	290	}
	291
	292	int dlclose(void *handle)
	293	{
	294	register ModulePtr mp = (ModulePtr)handle;
	295	int result;
	296	register ModulePtr mp1;
	297
	298	if (--mp->refCnt > 0)
	299	return 0;
	300	result = unload(mp->entry);
	301	if (result == -1) {
	302	errvalid++;
fd206186	303	strerrorcpy(errbuf, errno);
a0d0e21e	304	}
	305	if (mp->exports) {
	306	register ExportPtr ep;
	307	register int i;
	308	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
	309	if (ep->name)
	310	safefree(ep->name);
	311	safefree(mp->exports);
	312	}
	313	if (mp == modList)
	314	modList = mp->next;
	315	else {
	316	for (mp1 = modList; mp1; mp1 = mp1->next)
	317	if (mp1->next == mp) {
	318	mp1->next = mp->next;
	319	break;
	320	}
	321	}
	322	safefree(mp->name);
	323	safefree(mp);
	324	return result;
	325	}
	326
	327	static void terminate(void)
	328	{
	329	while (modList)
	330	dlclose(modList);
	331	}
	332
	333	/* Added by Wayne Scott
	334	* This is needed because the ldopen system call calls
	335	* calloc to allocated a block of date. The ldclose call calls free.
	336	* Without this we get this system calloc and perl's free, resulting
	337	* in a "Bad free" message. This way we always use perl's malloc.
	338	*/
	339	void *calloc(size_t ne, size_t sz)
	340	{
	341	void *out;
	342
	343	out = (void ) safemalloc(nesz);
	344	memzero(out, ne*sz);
	345	return(out);
	346	}
	347
	348	/*
	349	* Build the export table from the XCOFF .loader section.
	350	*/
	351	static int readExports(ModulePtr mp)
	352	{
	353	LDFILE *ldp = NULL;
	354	SCNHDR sh;
	355	LDHDR *lhp;
	356	char *ldbuf;
	357	LDSYM *ls;
	358	int i;
	359	ExportPtr ep;
	360
	361	if ((ldp = ldopen(mp->name, ldp)) == NULL) {
	362	struct ld_info *lp;
	363	char *buf;
	364	int size = 4*1024;
	365	if (errno != ENOENT) {
	366	errvalid++;
	367	strcpy(errbuf, "readExports: ");
fd206186	368	strerrorcat(errbuf, errno);
a0d0e21e	369	return -1;
	370	}
	371	/*
	372	* The module might be loaded due to the LIBPATH
	373	* environment variable. Search for the loaded
	374	* module using L_GETINFO.
	375	*/
	376	if ((buf = safemalloc(size)) == NULL) {
	377	errvalid++;
	378	strcpy(errbuf, "readExports: ");
fd206186	379	strerrorcat(errbuf, errno);
a0d0e21e	380	return -1;
	381	}
	382	while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
	383	safefree(buf);
	384	size += 4*1024;
	385	if ((buf = safemalloc(size)) == NULL) {
	386	errvalid++;
	387	strcpy(errbuf, "readExports: ");
fd206186	388	strerrorcat(errbuf, errno);
a0d0e21e	389	return -1;
	390	}
	391	}
	392	if (i == -1) {
	393	errvalid++;
	394	strcpy(errbuf, "readExports: ");
fd206186	395	strerrorcat(errbuf, errno);
a0d0e21e	396	safefree(buf);
	397	return -1;
	398	}
	399	/*
	400	* Traverse the list of loaded modules. The entry point
	401	* returned by load() does actually point to the data
	402	* segment origin.
	403	*/
	404	lp = (struct ld_info *)buf;
	405	while (lp) {
	406	if (lp->ldinfo_dataorg == mp->entry) {
	407	ldp = ldopen(lp->ldinfo_filename, ldp);
	408	break;
	409	}
	410	if (lp->ldinfo_next == 0)
	411	lp = NULL;
	412	else
	413	lp = (struct ld_info )((char )lp + lp->ldinfo_next);
	414	}
	415	safefree(buf);
	416	if (!ldp) {
	417	errvalid++;
	418	strcpy(errbuf, "readExports: ");
fd206186	419	strerrorcat(errbuf, errno);
a0d0e21e	420	return -1;
	421	}
	422	}
	423	if (TYPE(ldp) != U802TOCMAGIC) {
	424	errvalid++;
	425	strcpy(errbuf, "readExports: bad magic");
	426	while(ldclose(ldp) == FAILURE)
	427	;
	428	return -1;
	429	}
	430	if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
	431	errvalid++;
	432	strcpy(errbuf, "readExports: cannot read loader section header");
	433	while(ldclose(ldp) == FAILURE)
	434	;
	435	return -1;
	436	}
	437	/*
	438	* We read the complete loader section in one chunk, this makes
	439	* finding long symbol names residing in the string table easier.
	440	*/
	441	if ((ldbuf = (char *)safemalloc(sh.s_size)) == NULL) {
	442	errvalid++;
	443	strcpy(errbuf, "readExports: ");
fd206186	444	strerrorcat(errbuf, errno);
a0d0e21e	445	while(ldclose(ldp) == FAILURE)
	446	;
	447	return -1;
	448	}
	449	if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
	450	errvalid++;
	451	strcpy(errbuf, "readExports: cannot seek to loader section");
	452	safefree(ldbuf);
	453	while(ldclose(ldp) == FAILURE)
	454	;
	455	return -1;
	456	}
1553ab04	457	/* This first case is a hack, since it assumes that the 3rd parameter to
	458	FREAD is 1. See the redefinition of FREAD above to see how this works. */
	459	#ifdef USE_PERLIO
	460	if (FREAD(ldbuf, sh.s_size, 1, ldp) != sh.s_size) {
	461	#else
a0d0e21e	462	if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
1553ab04	463	#endif
a0d0e21e	464	errvalid++;
	465	strcpy(errbuf, "readExports: cannot read loader section");
	466	safefree(ldbuf);
	467	while(ldclose(ldp) == FAILURE)
	468	;
	469	return -1;
	470	}
	471	lhp = (LDHDR *)ldbuf;
	472	ls = (LDSYM *)(ldbuf+LDHDRSZ);
	473	/*
	474	* Count the number of exports to include in our export table.
	475	*/
	476	for (i = lhp->l_nsyms; i; i--, ls++) {
	477	if (!LDR_EXPORT(*ls))
	478	continue;
	479	mp->nExports++;
	480	}
	481	Newz(1001, mp->exports, mp->nExports, Export);
	482	if (mp->exports == NULL) {
	483	errvalid++;
	484	strcpy(errbuf, "readExports: ");
fd206186	485	strerrorcat(errbuf, errno);
a0d0e21e	486	safefree(ldbuf);
	487	while(ldclose(ldp) == FAILURE)
	488	;
	489	return -1;
	490	}
	491	/*
	492	* Fill in the export table. All entries are relative to
	493	* the entry point we got from load.
	494	*/
	495	ep = mp->exports;
	496	ls = (LDSYM *)(ldbuf+LDHDRSZ);
	497	for (i = lhp->l_nsyms; i; i--, ls++) {
	498	char *symname;
	499	if (!LDR_EXPORT(*ls))
	500	continue;
	501	if (ls->l_zeroes == 0)
	502	symname = ls->l_offset+lhp->l_stoff+ldbuf;
	503	else
	504	symname = ls->l_name;
	505	ep->name = savepv(symname);
	506	ep->addr = (void *)((unsigned long)mp->entry + ls->l_value);
	507	ep++;
	508	}
	509	safefree(ldbuf);
	510	while(ldclose(ldp) == FAILURE)
	511	;
	512	return 0;
	513	}
	514
	515	/*
	516	* Find the main modules entry point. This is used as export pointer
	517	* for loadbind() to be able to resolve references to the main part.
	518	*/
	519	static void * findMain(void)
	520	{
	521	struct ld_info *lp;
	522	char *buf;
	523	int size = 4*1024;
	524	int i;
	525	void *ret;
	526
	527	if ((buf = safemalloc(size)) == NULL) {
	528	errvalid++;
	529	strcpy(errbuf, "findMain: ");
fd206186	530	strerrorcat(errbuf, errno);
a0d0e21e	531	return NULL;
	532	}
	533	while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
	534	safefree(buf);
	535	size += 4*1024;
	536	if ((buf = safemalloc(size)) == NULL) {
	537	errvalid++;
	538	strcpy(errbuf, "findMain: ");
fd206186	539	strerrorcat(errbuf, errno);
a0d0e21e	540	return NULL;
	541	}
	542	}
	543	if (i == -1) {
	544	errvalid++;
	545	strcpy(errbuf, "findMain: ");
fd206186	546	strerrorcat(errbuf, errno);
a0d0e21e	547	safefree(buf);
	548	return NULL;
	549	}
	550	/*
	551	* The first entry is the main module. The entry point
	552	* returned by load() does actually point to the data
	553	* segment origin.
	554	*/
	555	lp = (struct ld_info *)buf;
	556	ret = lp->ldinfo_dataorg;
	557	safefree(buf);
	558	return ret;
	559	}
	560
	561	/* dl_dlopen.xs
	562	*
	563	* Platform: SunOS/Solaris, possibly others which use dlopen.
	564	* Author: Paul Marquess (pmarquess@bfsec.bt.co.uk)
	565	* Created: 10th July 1994
	566	*
	567	* Modified:
	568	* 15th July 1994 - Added code to explicitly save any error messages.
	569	* 3rd August 1994 - Upgraded to v3 spec.
	570	* 9th August 1994 - Changed to use IV
	571	* 10th August 1994 - Tim Bunce: Added RTLD_LAZY, switchable debugging,
	572	* basic FreeBSD support, removed ClearError
	573	*
	574	*/
	575
	576	/* Porting notes:
	577
	578	see dl_dlopen.xs
	579
	580	*/
	581
	582	#include "dlutils.c" /* SaveError() etc */
	583
	584
	585	static void
	586	dl_private_init()
	587	{
	588	(void)dl_generic_private_init();
	589	}
	590
	591	MODULE = DynaLoader PACKAGE = DynaLoader
	592
	593	BOOT:
	594	(void)dl_private_init();
	595
	596
	597	void *
ff7f3c60	598	dl_load_file(filename, flags=0)
	599	char * filename
	600	int flags
a0d0e21e	601	CODE:
ff7f3c60	602	DLDEBUG(1,PerlIO_printf(PerlIO_stderr(), "dl_load_file(%s,%x):\n", filename,flags));
	603	if (flags & 0x01)
	604	warn("Can't make loaded symbols global on this platform while loading %s",filename);
a0d0e21e	605	RETVAL = dlopen(filename, 1) ;
760ac839	606	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " libref=%x\n", RETVAL));
a0d0e21e	607	ST(0) = sv_newmortal() ;
	608	if (RETVAL == NULL)
	609	SaveError("%s",dlerror()) ;
	610	else
	611	sv_setiv( ST(0), (IV)RETVAL);
	612
	613
	614	void *
	615	dl_find_symbol(libhandle, symbolname)
	616	void * libhandle
	617	char * symbolname
	618	CODE:
760ac839	619	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_find_symbol(handle=%x, symbol=%s)\n",
a0d0e21e	620	libhandle, symbolname));
a0d0e21e	621	RETVAL = dlsym(libhandle, symbolname);
760ac839	622	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " symbolref = %x\n", RETVAL));
a0d0e21e	623	ST(0) = sv_newmortal() ;
	624	if (RETVAL == NULL)
	625	SaveError("%s",dlerror()) ;
	626	else
	627	sv_setiv( ST(0), (IV)RETVAL);
	628
	629
	630	void
	631	dl_undef_symbols()
	632	PPCODE:
	633
	634
	635
	636	# These functions should not need changing on any platform:
	637
	638	void
	639	dl_install_xsub(perl_name, symref, filename="$Package")
	640	char * perl_name
	641	void * symref
	642	char * filename
	643	CODE:
760ac839	644	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_install_xsub(name=%s, symref=%x)\n",
a0d0e21e	645	perl_name, symref));
	646	ST(0)=sv_2mortal(newRV((SV)newXS(perl_name, (void()())symref, filename)));
	647
	648
	649	char *
	650	dl_error()
	651	CODE:
	652	RETVAL = LastError ;
	653	OUTPUT:
	654	RETVAL
	655
	656	# end.