/* dl_aix.xs
*
* Written: 8/31/94 by Wayne Scott ([email protected])
*
* 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.
*/
#define PERLIO_NOT_STDIO 0
/*
* On AIX 4.3 and above the emulation layer is not needed any more, and
* indeed if perl uses its emulation and perl is linked into apache
* which is supposed to use the native dlopen conflicts arise.
* Jens-Uwe Mager [email protected]
*/
#ifdef USE_NATIVE_DLOPEN
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include <dlfcn.h>
#include "dlutils.c" /* SaveError() etc */
#else
/*
* @(#)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* This is an unpublished work copyright (c) 1992 Helios Software GmbH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
* <[email protected]> */
#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>
#undef FREAD
#undef FWRITE
#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 <[email protected]> */
/* 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 <[email protected]> */
#ifdef USE_libC /* The define comes, when it comes, from hints/aix.pl. */
# define LOAD loadAndInit
# define UNLOAD terminateAndUnload
# if defined(USE_vacpp_load_h)
# include "/usr/vacpp/include/load.h"
# elif defined(USE_ibmcxx_load_h)
# include "/usr/ibmcxx/include/load.h"
# elif defined(USE_xlC_load_h)
# include "/usr/lpp/xlC/include/load.h"
# elif defined(USE_load_h)
# include "/usr/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
#ifndef RTLD_LAZY
# define RTLD_LAZY 0
#endif
#ifndef RTLD_GLOBAL
# define RTLD_GLOBAL 0
#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;
typedef struct {
/*
* We keep a list of all loaded modules to be able to reference count
* duplicate dlopen's.
*/
ModulePtr x_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.
*/
char x_errbuf[BUFSIZ];
int x_errvalid;
void * x_mainModule;
} my_cxtx_t; /* this *must* be named my_cxtx_t */
#define DL_CXT_EXTRA /* ask for dl_cxtx to be defined in dlutils.c */
#include "dlutils.c" /* SaveError() etc */
#define dl_modList (dl_cxtx.x_modList)
#define dl_errbuf (dl_cxtx.x_errbuf)
#define dl_errvalid (dl_cxtx.x_errvalid)
#define dl_mainModule (dl_cxtx.x_mainModule)
static void caterr(char *);
static int readExports(ModulePtr);
static void *findMain(void);
/* these statics are ok because they're constants */
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_5005THREADS
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
dTHX;
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_5005THREADS
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
dTHX;
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;
dMY_CXT;
register ModulePtr mp;
/*
* Upon the first call register a terminate handler that will
* close all libraries.
*/
if (dl_mainModule == NULL) {
if ((dl_mainModule = findMain()) == NULL)
return NULL;
}
/*
* Scan the list of modules if have the module already loaded.
*/
for (mp = dl_modList; mp; mp = mp->next)
if (strcmp(mp->name, path) == 0) {
mp->refCnt++;
return mp;
}
Newz(1000,mp,1,Module);
if (mp == NULL) {
dl_errvalid++;
strcpy(dl_errbuf, "Newz: ");
strerrorcat(dl_errbuf, errno);
return NULL;
}
if ((mp->name = savepv(path)) == NULL) {
dl_errvalid++;
strcpy(dl_errbuf, "savepv: ");
strerrorcat(dl_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);
dl_errvalid++;
strcpy(dl_errbuf, "dlopen: ");
strcat(dl_errbuf, path);
strcat(dl_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(dl_errbuf, saverrno);
else {
char **p;
for (p = moreinfo; *p; p++)
caterr(*p);
}
} else
strerrorcat(dl_errbuf, saverrno);
return NULL;
}
mp->refCnt = 1;
mp->next = dl_modList;
dl_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. Also bind
* against the main part, in the case a perl is not the main
* part, e.g mod_perl as DSO in Apache so perl modules can
* also reference Apache symbols.
*/
if (loadbind(0, (void *)dlopen, mp->entry) == -1 ||
loadbind(0, dl_mainModule, mp->entry)) {
int saverrno = errno;
dlclose(mp);
dl_errvalid++;
strcpy(dl_errbuf, "loadbind: ");
strerrorcat(dl_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)
{
dTHX;
dMY_CXT;
register char *p = s;
while (*p >= '0' && *p <= '9')
p++;
switch(atoi(s)) {
case L_ERROR_TOOMANY:
strcat(dl_errbuf, "too many errors");
break;
case L_ERROR_NOLIB:
strcat(dl_errbuf, "can't load library");
strcat(dl_errbuf, p);
break;
case L_ERROR_UNDEF:
strcat(dl_errbuf, "can't find symbol");
strcat(dl_errbuf, p);
break;
case L_ERROR_RLDBAD:
strcat(dl_errbuf, "bad RLD");
strcat(dl_errbuf, p);
break;
case L_ERROR_FORMAT:
strcat(dl_errbuf, "bad exec format in");
strcat(dl_errbuf, p);
break;
case L_ERROR_ERRNO:
strerrorcat(dl_errbuf, atoi(++p));
break;
default:
strcat(dl_errbuf, s);
break;
}
}
void *dlsym(void *handle, const char *symbol)
{
dTHX;
dMY_CXT;
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;
dl_errvalid++;
strcpy(dl_errbuf, "dlsym: undefined symbol ");
strcat(dl_errbuf, symbol);
return NULL;
}
char *dlerror(void)
{
dTHX;
dMY_CXT;
if (dl_errvalid) {
dl_errvalid = 0;
return dl_errbuf;
}
return NULL;
}
int dlclose(void *handle)
{
dTHX;
dMY_CXT;
register ModulePtr mp = (ModulePtr)handle;
int result;
register ModulePtr mp1;
if (--mp->refCnt > 0)
return 0;
result = UNLOAD(mp->entry);
if (result == -1) {
dl_errvalid++;
strerrorcpy(dl_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 == dl_modList)
dl_modList = mp->next;
else {
for (mp1 = dl_modList; mp1; mp1 = mp1->next)
if (mp1->next == mp) {
mp1->next = mp->next;
break;
}
}
safefree(mp->name);
safefree(mp);
return result;
}
/* 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;
dMY_CXT;
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) {
dl_errvalid++;
strcpy(dl_errbuf, "readExports: ");
strerrorcat(dl_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) {
dl_errvalid++;
strcpy(dl_errbuf, "readExports: ");
strerrorcat(dl_errbuf, errno);
return -1;
}
while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
safefree(buf);
size += 4*1024;
if ((buf = safemalloc(size)) == NULL) {
dl_errvalid++;
strcpy(dl_errbuf, "readExports: ");
strerrorcat(dl_errbuf, errno);
return -1;
}
}
if (i == -1) {
dl_errvalid++;
strcpy(dl_errbuf, "readExports: ");
strerrorcat(dl_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) {
dl_errvalid++;
strcpy(dl_errbuf, "readExports: ");
strerrorcat(dl_errbuf, errno);
return -1;
}
}
#ifdef USE_64_BIT_ALL
if (TYPE(ldp) != U803XTOCMAGIC) {
#else
if (TYPE(ldp) != U802TOCMAGIC) {
#endif
dl_errvalid++;
strcpy(dl_errbuf, "readExports: bad magic");
while(ldclose(ldp) == FAILURE)
;
return -1;
}
if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
dl_errvalid++;
strcpy(dl_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) {
dl_errvalid++;
strcpy(dl_errbuf, "readExports: ");
strerrorcat(dl_errbuf, errno);
while(ldclose(ldp) == FAILURE)
;
return -1;
}
if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
dl_errvalid++;
strcpy(dl_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. */
if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
dl_errvalid++;
strcpy(dl_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) {
dl_errvalid++;
strcpy(dl_errbuf, "readExports: ");
strerrorcat(dl_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;
}
/*
* 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)
{
dTHX;
dMY_CXT;
struct ld_info *lp;
char *buf;
int size = 4*1024;
int i;
void *ret;
if ((buf = safemalloc(size)) == NULL) {
dl_errvalid++;
strcpy(dl_errbuf, "findMain: ");
strerrorcat(dl_errbuf, errno);
return NULL;
}
while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
safefree(buf);
size += 4*1024;
if ((buf = safemalloc(size)) == NULL) {
dl_errvalid++;
strcpy(dl_errbuf, "findMain: ");
strerrorcat(dl_errbuf, errno);
return NULL;
}
}
if (i == -1) {
dl_errvalid++;
strcpy(dl_errbuf, "findMain: ");
strerrorcat(dl_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;
}
#endif /* USE_NATIVE_DLOPEN */
/* dl_dlopen.xs
*
* Platform: SunOS/Solaris, possibly others which use dlopen.
* Author: Paul Marquess ([email protected])
* 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
*/
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, RTLD_GLOBAL|RTLD_LAZY) ;
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) );
int
dl_unload_file(libref)
void * libref
CODE:
DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_unload_file(%lx):\n", libref));
RETVAL = (dlclose(libref) == 0 ? 1 : 0);
if (!RETVAL)
SaveError(aTHX_ "%s", dlerror()) ;
DLDEBUG(2,PerlIO_printf(Perl_debug_log, " retval = %d\n", RETVAL));
OUTPUT:
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:
dMY_CXT;
RETVAL = dl_last_error ;
OUTPUT:
RETVAL
# end.
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