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 * This is an unpublished work copyright (c) 1992 Helios Software GmbH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

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

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

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

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

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

/*
 * AIX 4.3 does remove some useful definitions from ldfcn.h. Define
 * these here to compensate for that lossage.
 */
#ifndef BEGINNING
# define BEGINNING SEEK_SET
#endif
#ifndef FSEEK
# define FSEEK(ldptr,o,p)	fseek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr) +o):o,p)
#endif
#ifndef FREAD
# define FREAD(p,s,n,ldptr)	fread(p,s,n,IOPTR(ldptr))
#endif

/* 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;
	AIX_SCNHDR sh;
	AIX_LDHDR *lhp;
	char *ldbuf;
	AIX_LDSYM *ls;
	int i;
	ExportPtr ep;

	if ((ldp = ldopen(mp->name, ldp)) == NULL) {
		struct ld_info *lp;
		char *buf;
		int size = 4*1024;
		if (errno != ENOENT) {
			errvalid++;
			strcpy(errbuf, "readExports: ");
			strerrorcat(errbuf, errno);
			return -1;
		}
		/*
		 * The module might be loaded due to the LIBPATH
		 * environment variable. Search for the loaded
		 * module using L_GETINFO.
		 */
		if ((buf = safemalloc(size)) == NULL) {
			errvalid++;
			strcpy(errbuf, "readExports: ");
			strerrorcat(errbuf, errno);
			return -1;
		}
		while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
			safefree(buf);
			size += 4*1024;
			if ((buf = safemalloc(size)) == NULL) {
				errvalid++;
				strcpy(errbuf, "readExports: ");
				strerrorcat(errbuf, errno);
				return -1;
			}
		}
		if (i == -1) {
			errvalid++;
			strcpy(errbuf, "readExports: ");
			strerrorcat(errbuf, errno);
			safefree(buf);
			return -1;
		}
		/*
		 * Traverse the list of loaded modules. The entry point
		 * returned by LOAD() does actually point to the data
		 * segment origin.
		 */
		lp = (struct ld_info *)buf;
		while (lp) {
			if (lp->ldinfo_dataorg == mp->entry) {
				ldp = ldopen(lp->ldinfo_filename, ldp);
				break;
			}
			if (lp->ldinfo_next == 0)
				lp = NULL;
			else
				lp = (struct ld_info *)((char *)lp + lp->ldinfo_next);
		}
		safefree(buf);
		if (!ldp) {
			errvalid++;
			strcpy(errbuf, "readExports: ");
			strerrorcat(errbuf, errno);
			return -1;
		}
	}
#ifdef USE_64_BIT_ALL
	if (TYPE(ldp) != U803XTOCMAGIC) {
#else
	if (TYPE(ldp) != U802TOCMAGIC) {
#endif
		errvalid++;
		strcpy(errbuf, "readExports: bad magic");
		while(ldclose(ldp) == FAILURE)
			;
		return -1;
	}
	if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
		errvalid++;
		strcpy(errbuf, "readExports: cannot read loader section header");
		while(ldclose(ldp) == FAILURE)
			;
		return -1;
	}
	/*
	 * We read the complete loader section in one chunk, this makes
	 * finding long symbol names residing in the string table easier.
	 */
	if ((ldbuf = (char *)safemalloc(sh.s_size)) == NULL) {
		errvalid++;
		strcpy(errbuf, "readExports: ");
		strerrorcat(errbuf, errno);
		while(ldclose(ldp) == FAILURE)
			;
		return -1;
	}
	if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
		errvalid++;
		strcpy(errbuf, "readExports: cannot seek to loader section");
		safefree(ldbuf);
		while(ldclose(ldp) == FAILURE)
			;
		return -1;
	}
/* This first case is a hack, since it assumes that the 3rd parameter to
   FREAD is 1. See the redefinition of FREAD above to see how this works. */
#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 = (AIX_LDHDR *)ldbuf;
	ls = (AIX_LDSYM *)(ldbuf+AIX_LDHDRSZ);
	/*
	 * Count the number of exports to include in our export table.
	 */
	for (i = lhp->l_nsyms; i; i--, ls++) {
		if (!LDR_EXPORT(*ls))
			continue;
		mp->nExports++;
	}
	Newz(1001, mp->exports, mp->nExports, Export);
	if (mp->exports == NULL) {
		errvalid++;
		strcpy(errbuf, "readExports: ");
		strerrorcat(errbuf, errno);
		safefree(ldbuf);
		while(ldclose(ldp) == FAILURE)
			;
		return -1;
	}
	/*
	 * Fill in the export table. All entries are relative to
	 * the entry point we got from load.
	 */
	ep = mp->exports;
	ls = (AIX_LDSYM *)(ldbuf+AIX_LDHDRSZ);
	for (i = lhp->l_nsyms; i; i--, ls++) {
		char *symname;
		if (!LDR_EXPORT(*ls))
			continue;
#ifndef USE_64_BIT_ALL
		if (ls->l_zeroes == 0)
#endif
			symname = ls->l_offset+lhp->l_stoff+ldbuf;
#ifndef USE_64_BIT_ALL
		else
			symname = ls->l_name;
#endif
		ep->name = savepv(symname);
		ep->addr = (void *)((unsigned long)mp->entry + ls->l_value);
		ep++;
	}
	safefree(ldbuf);
	while(ldclose(ldp) == FAILURE)
		;
	return 0;
}

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

/* Porting notes:

	see dl_dlopen.xs

*/

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


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

BOOT:
    (void)dl_private_init(aTHX);


void *
dl_load_file(filename, flags=0)
	char *	filename
	int	flags
	CODE:
	DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_load_file(%s,%x):\n", filename,flags));
	if (flags & 0x01)
	    Perl_warn(aTHX_ "Can't make loaded symbols global on this platform while loading %s",filename);
	RETVAL = dlopen(filename, 1) ;
	DLDEBUG(2,PerlIO_printf(Perl_debug_log, " libref=%x\n", RETVAL));
	ST(0) = sv_newmortal() ;
	if (RETVAL == NULL)
	    SaveError(aTHX_ "%s",dlerror()) ;
	else
	    sv_setiv( ST(0), PTR2IV(RETVAL) );


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