671 lines
15 KiB
Plaintext
671 lines
15 KiB
Plaintext
/* 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* This is an unpublished work copyright (c) 1992 Helios Software GmbH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.
|