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* This is an unpublished work copyright (c) 1992 Helios Software GmbH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