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 * This is an unpublished work copyright (c) 1992 Helios Software GmbH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

  
/* 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: ");
		strcat(errbuf, strerror(errno));
		return NULL;
	}
	
	if ((mp->name = savepv(path)) == NULL) {
		errvalid++;
		strcpy(errbuf, "savepv: ");
		strcat(errbuf, strerror(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)
				strcpy(errbuf, strerror(errno));
			else {
				char **p;
				for (p = tmp; *p; p++)
					caterr(*p);
			}
		} else
			strcat(errbuf, strerror(errno));
		return NULL;
	}
	mp->refCnt = 1;
	mp->next = modList;
	modList = mp;
	if (loadbind(0, mainModule, mp->entry) == -1) {
		dlclose(mp);
		errvalid++;
		strcpy(errbuf, "loadbind: ");
		strcat(errbuf, strerror(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:
		strcat(errbuf, strerror(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++;
		strcpy(errbuf, strerror(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: ");
			strcat(errbuf, strerror(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: ");
			strcat(errbuf, strerror(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: ");
				strcat(errbuf, strerror(errno));
				return -1;
			}
		}
		if (i == -1) {
			errvalid++;
			strcpy(errbuf, "readExports: ");
			strcat(errbuf, strerror(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: ");
			strcat(errbuf, strerror(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: ");
		strcat(errbuf, strerror(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: ");
		strcat(errbuf, strerror(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: ");
		strcat(errbuf, strerror(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: ");
			strcat(errbuf, strerror(errno));
			return NULL;
		}
	}
	if (i == -1) {
		errvalid++;
		strcpy(errbuf, "findMain: ");
		strcat(errbuf, strerror(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
	80
	81	/* ARGSUSED */
	82	void dlopen(char path, int mode)
	83	{
	84	register ModulePtr mp;
	85	static void *mainModule;
	86
	87	/*
	88	* Upon the first call register a terminate handler that will
	89	* close all libraries. Also get a reference to the main module
	90	* for use with loadbind.
	91	*/
	92	if (!mainModule) {
	93	if ((mainModule = findMain()) == NULL)
	94	return NULL;
	95	atexit(terminate);
	96	}
	97	/*
	98	* Scan the list of modules if have the module already loaded.
	99	*/
	100	for (mp = modList; mp; mp = mp->next)
	101	if (strcmp(mp->name, path) == 0) {
102	mp->refCnt++;
103	return mp;
104	}
105	Newz(1000,mp,1,Module);
106	if (mp == NULL) {
107	errvalid++;
108	strcpy(errbuf, "Newz: ");
109	strcat(errbuf, strerror(errno));
110	return NULL;
111	}
112
113	if ((mp->name = savepv(path)) == NULL) {
114	errvalid++;
115	strcpy(errbuf, "savepv: ");
116	strcat(errbuf, strerror(errno));
117	safefree(mp);
118	return NULL;
119	}
120	/*
121	* load should be declared load(const char *...). Thus we
122	* cast the path to a normal char *. Ugly.
123	*/
124	if ((mp->entry = (void )load((char )path, L_NOAUTODEFER, NULL)) == NULL) {
125	safefree(mp->name);
126	safefree(mp);
127	errvalid++;
128	strcpy(errbuf, "dlopen: ");
129	strcat(errbuf, path);
130	strcat(errbuf, ": ");
131	/*
132	* If AIX says the file is not executable, the error
133	* can be further described by querying the loader about
134	* the last error.
135	*/
136	if (errno == ENOEXEC) {
137	char tmp[BUFSIZ/sizeof(char )];
138	if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1)
139	strcpy(errbuf, strerror(errno));
140	else {
141	char **p;
142	for (p = tmp; *p; p++)
143	caterr(*p);
144	}
145	} else
146	strcat(errbuf, strerror(errno));
147	return NULL;
148	}
149	mp->refCnt = 1;
150	mp->next = modList;
151	modList = mp;
152	if (loadbind(0, mainModule, mp->entry) == -1) {
153	dlclose(mp);
154	errvalid++;
155	strcpy(errbuf, "loadbind: ");
156	strcat(errbuf, strerror(errno));
157	return NULL;
158	}
159	if (readExports(mp) == -1) {
160	dlclose(mp);
161	return NULL;
162	}
163	return mp;
164	}
165
166	/*
167	* Attempt to decipher an AIX loader error message and append it
168	* to our static error message buffer.
169	*/
170	static void caterr(char *s)
171	{
172	register char *p = s;
173
174	while (p >= '0' && p <= '9')
175	p++;
176	switch(atoi(s)) {
177	case L_ERROR_TOOMANY:
178	strcat(errbuf, "to many errors");
179	break;
180	case L_ERROR_NOLIB:
181	strcat(errbuf, "can't load library");
182	strcat(errbuf, p);
183	break;
184	case L_ERROR_UNDEF:
185	strcat(errbuf, "can't find symbol");
186	strcat(errbuf, p);
187	break;
188	case L_ERROR_RLDBAD:
189	strcat(errbuf, "bad RLD");
190	strcat(errbuf, p);
191	break;
192	case L_ERROR_FORMAT:
193	strcat(errbuf, "bad exec format in");
194	strcat(errbuf, p);
195	break;
196	case L_ERROR_ERRNO:
197	strcat(errbuf, strerror(atoi(++p)));
198	break;
199	default:
200	strcat(errbuf, s);
201	break;
202	}
203	}
204
205	void dlsym(void handle, const char *symbol)
206	{
207	register ModulePtr mp = (ModulePtr)handle;
208	register ExportPtr ep;
209	register int i;
210
211	/*
212	* Could speed up search, but I assume that one assigns
213	* the result to function pointers anyways.
214	*/
215	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
216	if (strcmp(ep->name, symbol) == 0)
217	return ep->addr;
218	errvalid++;
219	strcpy(errbuf, "dlsym: undefined symbol ");
220	strcat(errbuf, symbol);
221	return NULL;
222	}
223
224	char *dlerror(void)
225	{
226	if (errvalid) {
227	errvalid = 0;
228	return errbuf;
229	}
230	return NULL;
231	}
232
233	int dlclose(void *handle)
234	{
235	register ModulePtr mp = (ModulePtr)handle;
236	int result;
237	register ModulePtr mp1;
238
239	if (--mp->refCnt > 0)
240	return 0;
241	result = unload(mp->entry);
242	if (result == -1) {
243	errvalid++;
244	strcpy(errbuf, strerror(errno));
245	}
246	if (mp->exports) {
247	register ExportPtr ep;
248	register int i;
249	for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
250	if (ep->name)
251	safefree(ep->name);
252	safefree(mp->exports);
253	}
254	if (mp == modList)
255	modList = mp->next;
256	else {
257	for (mp1 = modList; mp1; mp1 = mp1->next)
258	if (mp1->next == mp) {
259	mp1->next = mp->next;
260	break;
261	}
262	}
263	safefree(mp->name);
264	safefree(mp);
265	return result;
266	}
267
268	static void terminate(void)
269	{
270	while (modList)
271	dlclose(modList);
272	}
273
274	/* Added by Wayne Scott
275	* This is needed because the ldopen system call calls
276	* calloc to allocated a block of date. The ldclose call calls free.
277	* Without this we get this system calloc and perl's free, resulting
278	* in a "Bad free" message. This way we always use perl's malloc.
279	*/
280	void *calloc(size_t ne, size_t sz)
281	{
282	void *out;
283
284	out = (void ) safemalloc(nesz);
285	memzero(out, ne*sz);
286	return(out);
287	}
288
289	/*
290	* Build the export table from the XCOFF .loader section.
291	*/
292	static int readExports(ModulePtr mp)
293	{
294	LDFILE *ldp = NULL;
295	SCNHDR sh;
296	LDHDR *lhp;
297	char *ldbuf;
298	LDSYM *ls;
299	int i;
300	ExportPtr ep;
301
302	if ((ldp = ldopen(mp->name, ldp)) == NULL) {
303	struct ld_info *lp;
304	char *buf;
305	int size = 4*1024;
306	if (errno != ENOENT) {
307	errvalid++;
308	strcpy(errbuf, "readExports: ");
309	strcat(errbuf, strerror(errno));
310	return -1;
311	}
312	/*
313	* The module might be loaded due to the LIBPATH
314	* environment variable. Search for the loaded
315	* module using L_GETINFO.
316	*/
317	if ((buf = safemalloc(size)) == NULL) {
318	errvalid++;
319	strcpy(errbuf, "readExports: ");
320	strcat(errbuf, strerror(errno));
321	return -1;
322	}
323	while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
324	safefree(buf);
325	size += 4*1024;
326	if ((buf = safemalloc(size)) == NULL) {
327	errvalid++;
328	strcpy(errbuf, "readExports: ");
329	strcat(errbuf, strerror(errno));
330	return -1;
331	}
332	}
333	if (i == -1) {
334	errvalid++;
335	strcpy(errbuf, "readExports: ");
336	strcat(errbuf, strerror(errno));
337	safefree(buf);
338	return -1;
339	}
340	/*
341	* Traverse the list of loaded modules. The entry point
342	* returned by load() does actually point to the data
343	* segment origin.
344	*/
345	lp = (struct ld_info *)buf;
346	while (lp) {
347	if (lp->ldinfo_dataorg == mp->entry) {
348	ldp = ldopen(lp->ldinfo_filename, ldp);
349	break;
350	}
351	if (lp->ldinfo_next == 0)
352	lp = NULL;
353	else
354	lp = (struct ld_info )((char )lp + lp->ldinfo_next);
355	}
356	safefree(buf);
357	if (!ldp) {
358	errvalid++;
359	strcpy(errbuf, "readExports: ");
360	strcat(errbuf, strerror(errno));
361	return -1;
362	}
363	}
364	if (TYPE(ldp) != U802TOCMAGIC) {
365	errvalid++;
366	strcpy(errbuf, "readExports: bad magic");
367	while(ldclose(ldp) == FAILURE)
368	;
369	return -1;
370	}
371	if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
372	errvalid++;
373	strcpy(errbuf, "readExports: cannot read loader section header");
374	while(ldclose(ldp) == FAILURE)
375	;
376	return -1;
377	}
378	/*
379	* We read the complete loader section in one chunk, this makes
380	* finding long symbol names residing in the string table easier.
381	*/
382	if ((ldbuf = (char *)safemalloc(sh.s_size)) == NULL) {
383	errvalid++;
384	strcpy(errbuf, "readExports: ");
385	strcat(errbuf, strerror(errno));
386	while(ldclose(ldp) == FAILURE)
387	;
388	return -1;
389	}
390	if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
391	errvalid++;
392	strcpy(errbuf, "readExports: cannot seek to loader section");
393	safefree(ldbuf);
394	while(ldclose(ldp) == FAILURE)
395	;
396	return -1;
397	}
1553ab04	398	/* This first case is a hack, since it assumes that the 3rd parameter to
	399	FREAD is 1. See the redefinition of FREAD above to see how this works. */
	400	#ifdef USE_PERLIO
	401	if (FREAD(ldbuf, sh.s_size, 1, ldp) != sh.s_size) {
	402	#else
a0d0e21e	403	if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
1553ab04	404	#endif
a0d0e21e	405	errvalid++;
	406	strcpy(errbuf, "readExports: cannot read loader section");
	407	safefree(ldbuf);
	408	while(ldclose(ldp) == FAILURE)
	409	;
	410	return -1;
	411	}
	412	lhp = (LDHDR *)ldbuf;
	413	ls = (LDSYM *)(ldbuf+LDHDRSZ);
	414	/*
	415	* Count the number of exports to include in our export table.
	416	*/
	417	for (i = lhp->l_nsyms; i; i--, ls++) {
	418	if (!LDR_EXPORT(*ls))
	419	continue;
	420	mp->nExports++;
	421	}
	422	Newz(1001, mp->exports, mp->nExports, Export);
	423	if (mp->exports == NULL) {
	424	errvalid++;
	425	strcpy(errbuf, "readExports: ");
	426	strcat(errbuf, strerror(errno));
	427	safefree(ldbuf);
	428	while(ldclose(ldp) == FAILURE)
	429	;
	430	return -1;
	431	}
	432	/*
	433	* Fill in the export table. All entries are relative to
	434	* the entry point we got from load.
	435	*/
	436	ep = mp->exports;
	437	ls = (LDSYM *)(ldbuf+LDHDRSZ);
	438	for (i = lhp->l_nsyms; i; i--, ls++) {
	439	char *symname;
	440	if (!LDR_EXPORT(*ls))
	441	continue;
	442	if (ls->l_zeroes == 0)
	443	symname = ls->l_offset+lhp->l_stoff+ldbuf;
	444	else
	445	symname = ls->l_name;
	446	ep->name = savepv(symname);
	447	ep->addr = (void *)((unsigned long)mp->entry + ls->l_value);
	448	ep++;
	449	}
	450	safefree(ldbuf);
	451	while(ldclose(ldp) == FAILURE)
	452	;
	453	return 0;
	454	}
	455
	456	/*
	457	* Find the main modules entry point. This is used as export pointer
	458	* for loadbind() to be able to resolve references to the main part.
	459	*/
	460	static void * findMain(void)
	461	{
	462	struct ld_info *lp;
	463	char *buf;
	464	int size = 4*1024;
	465	int i;
	466	void *ret;
	467
	468	if ((buf = safemalloc(size)) == NULL) {
469	errvalid++;
470	strcpy(errbuf, "findMain: ");
471	strcat(errbuf, strerror(errno));
472	return NULL;
473	}
474	while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
475	safefree(buf);
476	size += 4*1024;
477	if ((buf = safemalloc(size)) == NULL) {
478	errvalid++;
479	strcpy(errbuf, "findMain: ");
480	strcat(errbuf, strerror(errno));
481	return NULL;
482	}
483	}
484	if (i == -1) {
485	errvalid++;
486	strcpy(errbuf, "findMain: ");
487	strcat(errbuf, strerror(errno));
488	safefree(buf);
489	return NULL;
490	}
491	/*
492	* The first entry is the main module. The entry point
493	* returned by load() does actually point to the data
494	* segment origin.
495	*/
496	lp = (struct ld_info *)buf;
497	ret = lp->ldinfo_dataorg;
498	safefree(buf);
499	return ret;
500	}
501
502	/* dl_dlopen.xs
503	*
504	* Platform: SunOS/Solaris, possibly others which use dlopen.
505	* Author: Paul Marquess (pmarquess@bfsec.bt.co.uk)
506	* Created: 10th July 1994
507	*
508	* Modified:
509	* 15th July 1994 - Added code to explicitly save any error messages.
510	* 3rd August 1994 - Upgraded to v3 spec.
511	* 9th August 1994 - Changed to use IV
512	* 10th August 1994 - Tim Bunce: Added RTLD_LAZY, switchable debugging,
513	* basic FreeBSD support, removed ClearError
514	*
515	*/
516
517	/* Porting notes:
518
519	see dl_dlopen.xs
520
521	*/
522
523	#include "dlutils.c" /* SaveError() etc */
524
525
526	static void
527	dl_private_init()
528	{
529	(void)dl_generic_private_init();
530	}
531
532	MODULE = DynaLoader PACKAGE = DynaLoader
533
534	BOOT:
535	(void)dl_private_init();
536
537
538	void *
ff7f3c60	539	dl_load_file(filename, flags=0)
	540	char * filename
	541	int flags
a0d0e21e	542	CODE:
ff7f3c60	543	DLDEBUG(1,PerlIO_printf(PerlIO_stderr(), "dl_load_file(%s,%x):\n", filename,flags));
	544	if (flags & 0x01)
	545	warn("Can't make loaded symbols global on this platform while loading %s",filename);
a0d0e21e	546	RETVAL = dlopen(filename, 1) ;
760ac839	547	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " libref=%x\n", RETVAL));
a0d0e21e	548	ST(0) = sv_newmortal() ;
	549	if (RETVAL == NULL)
	550	SaveError("%s",dlerror()) ;
	551	else
	552	sv_setiv( ST(0), (IV)RETVAL);
	553
	554
	555	void *
	556	dl_find_symbol(libhandle, symbolname)
	557	void * libhandle
	558	char * symbolname
	559	CODE:
760ac839	560	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_find_symbol(handle=%x, symbol=%s)\n",
a0d0e21e	561	libhandle, symbolname));
a0d0e21e	562	RETVAL = dlsym(libhandle, symbolname);
760ac839	563	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " symbolref = %x\n", RETVAL));
a0d0e21e	564	ST(0) = sv_newmortal() ;
	565	if (RETVAL == NULL)
	566	SaveError("%s",dlerror()) ;
	567	else
	568	sv_setiv( ST(0), (IV)RETVAL);
	569
	570
	571	void
	572	dl_undef_symbols()
	573	PPCODE:
	574
	575
	576
	577	# These functions should not need changing on any platform:
	578
	579	void
	580	dl_install_xsub(perl_name, symref, filename="$Package")
	581	char * perl_name
	582	void * symref
	583	char * filename
	584	CODE:
760ac839	585	DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_install_xsub(name=%s, symref=%x)\n",
a0d0e21e	586	perl_name, symref));
	587	ST(0)=sv_2mortal(newRV((SV)newXS(perl_name, (void()())symref, filename)));
	588
	589
	590	char *
	591	dl_error()
	592	CODE:
	593	RETVAL = LastError ;
	594	OUTPUT:
	595	RETVAL
	596
	597	# end.