631 lines
13 KiB
C
631 lines
13 KiB
C
|
/*
|
|||
|
|
* tclLoadAix.c --
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|
|
*
|
|||
|
|
* This file implements the dlopen and dlsym APIs under the AIX operating
|
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|
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* system, to enable the Tcl "load" command to work. This code was
|
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|
|
* provided by Jens-Uwe Mager.
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*
|
|||
|
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* This file is subject to the following copyright notice, which is
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* different from the notice used elsewhere in Tcl. The file has been
|
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* modified to incorporate the file dlfcn.h in-line.
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*
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* Copyright (c) 1992,1993,1995,1996, Jens-Uwe Mager, Helios Software GmbH
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* Not derived from licensed software.
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*
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|
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* Permission is granted to freely use, copy, modify, and redistribute
|
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* this software, provided that the author is not construed to be liable
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* for any results of using the software, alterations are clearly marked
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* as such, and this notice is not modified.
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*
|
|||
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* Note: this file has been altered from the original in a few ways in order
|
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|
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* to work properly with Tcl.
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|||
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|
*/
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|||
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/*
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|||
|
|
* @(#)dlfcn.c 1.7 revision of 95/08/14 19:08:38
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* This is an unpublished work copyright (c) 1992 HELIOS Software GmbH
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* 30159 Hannover, Germany
|
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|
*/
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|
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|
#include <stdio.h>
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|||
|
|
#include <errno.h>
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|||
|
|
#include <string.h>
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|||
|
|
#include <stdlib.h>
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|||
|
|
#include <sys/types.h>
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|||
|
|
#include <sys/ldr.h>
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|||
|
|
#include <a.out.h>
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|||
|
|
#include <ldfcn.h>
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|||
|
|
#include "../compat/dlfcn.h"
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|||
|
|
|
|||
|
|
/*
|
|||
|
|
* 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.
|
|||
|
|
*/
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|
|
|
|||
|
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typedef struct {
|
|||
|
|
char *name; /* The symbols's name. */
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|
|
void *addr; /* Its relocated virtual address. */
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|||
|
|
} Export, *ExportPtr;
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|||
|
|
|
|||
|
|
/*
|
|||
|
|
* xlC uses the following structure to list its constructors and destructors.
|
|||
|
|
* This is gleaned from the output of munch.
|
|||
|
|
*/
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|||
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|
|
|||
|
|
typedef struct {
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|||
|
|
void (*init)(void); /* call static constructors */
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|||
|
|
void (*term)(void); /* call static destructors */
|
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|
|
} Cdtor, *CdtorPtr;
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* 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 */
|
|||
|
|
struct dl_info *info; /* optional init/terminate functions */
|
|||
|
|
CdtorPtr cdtors; /* optional C++ constructors */
|
|||
|
|
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
|
|||
|
|
* and destructors 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;
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|||
|
|
|
|||
|
|
static void caterr(char *);
|
|||
|
|
static int readExports(ModulePtr);
|
|||
|
|
static void terminate(void);
|
|||
|
|
static void *findMain(void);
|
|||
|
|
|
|||
|
|
void *
|
|||
|
|
dlopen(
|
|||
|
|
const char *path,
|
|||
|
|
int mode)
|
|||
|
|
{
|
|||
|
|
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) {
|
|||
|
|
mainModule = findMain();
|
|||
|
|
if (mainModule == NULL) {
|
|||
|
|
return NULL;
|
|||
|
|
}
|
|||
|
|
atexit(terminate);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* Scan the list of modules if we have the module already loaded.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
for (mp = modList; mp; mp = mp->next) {
|
|||
|
|
if (strcmp(mp->name, path) == 0) {
|
|||
|
|
mp->refCnt++;
|
|||
|
|
return (void *) mp;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
mp = (ModulePtr) calloc(1, sizeof(*mp));
|
|||
|
|
if (mp == NULL) {
|
|||
|
|
errvalid++;
|
|||
|
|
strcpy(errbuf, "calloc: ");
|
|||
|
|
strcat(errbuf, strerror(errno));
|
|||
|
|
return NULL;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
mp->name = malloc(strlen(path) + 1);
|
|||
|
|
strcpy(mp->name, path);
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* load should be declared load(const char *...). Thus we cast the path to
|
|||
|
|
* a normal char *. Ugly.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
mp->entry = (void *) load((char *)path, L_NOAUTODEFER, NULL);
|
|||
|
|
if (mp->entry == NULL) {
|
|||
|
|
free(mp->name);
|
|||
|
|
free(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 *)], **p;
|
|||
|
|
|
|||
|
|
if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1) {
|
|||
|
|
strcpy(errbuf, strerror(errno));
|
|||
|
|
} else {
|
|||
|
|
for (p=tmp ; *p ; p++) {
|
|||
|
|
caterr(*p);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
} else {
|
|||
|
|
strcat(errbuf, strerror(errno));
|
|||
|
|
}
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|||
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|
return NULL;
|
|||
|
|
}
|
|||
|
|
|
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|
|
mp->refCnt = 1;
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|||
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|
mp->next = modList;
|
|||
|
|
modList = mp;
|
|||
|
|
|
|||
|
|
if (loadbind(0, mainModule, mp->entry) == -1) {
|
|||
|
|
loadbindFailure:
|
|||
|
|
dlclose(mp);
|
|||
|
|
errvalid++;
|
|||
|
|
strcpy(errbuf, "loadbind: ");
|
|||
|
|
strcat(errbuf, strerror(errno));
|
|||
|
|
return NULL;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* If the user wants global binding, loadbind against all other loaded
|
|||
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|
* modules.
|
|||
|
|
*/
|
|||
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|
|||
|
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if (mode & RTLD_GLOBAL) {
|
|||
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|
ModulePtr mp1;
|
|||
|
|
|
|||
|
|
for (mp1 = mp->next; mp1; mp1 = mp1->next) {
|
|||
|
|
if (loadbind(0, mp1->entry, mp->entry) == -1) {
|
|||
|
|
goto loadbindFailure;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (readExports(mp) == -1) {
|
|||
|
|
dlclose(mp);
|
|||
|
|
return NULL;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* If there is a dl_info structure, call the init function.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
if (mp->info = (struct dl_info *)dlsym(mp, "dl_info")) {
|
|||
|
|
if (mp->info->init) {
|
|||
|
|
mp->info->init();
|
|||
|
|
}
|
|||
|
|
} else {
|
|||
|
|
errvalid = 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* If the shared object was compiled using xlC we will need to call static
|
|||
|
|
* constructors (and later on dlclose destructors).
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
if (mp->cdtors = (CdtorPtr) dlsym(mp, "__cdtors")) {
|
|||
|
|
while (mp->cdtors->init) {
|
|||
|
|
mp->cdtors->init();
|
|||
|
|
mp->cdtors++;
|
|||
|
|
}
|
|||
|
|
} else {
|
|||
|
|
errvalid = 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return (void *) mp;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* Attempt to decipher an AIX loader error message and append it to our static
|
|||
|
|
* error message buffer.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
static void
|
|||
|
|
caterr(
|
|||
|
|
char *s)
|
|||
|
|
{
|
|||
|
|
char *p = s;
|
|||
|
|
|
|||
|
|
while (*p >= '0' && *p <= '9') {
|
|||
|
|
p++;
|
|||
|
|
}
|
|||
|
|
switch (atoi(s)) { /* INTL: "C", UTF safe. */
|
|||
|
|
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))); /* INTL: "C", UTF safe. */
|
|||
|
|
break;
|
|||
|
|
default:
|
|||
|
|
strcat(errbuf, s);
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
void *
|
|||
|
|
dlsym(
|
|||
|
|
void *handle,
|
|||
|
|
const char *symbol)
|
|||
|
|
{
|
|||
|
|
ModulePtr mp = (ModulePtr)handle;
|
|||
|
|
ExportPtr ep;
|
|||
|
|
int i;
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* Could speed up the 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)
|
|||
|
|
{
|
|||
|
|
ModulePtr mp = (ModulePtr)handle;
|
|||
|
|
int result;
|
|||
|
|
ModulePtr mp1;
|
|||
|
|
|
|||
|
|
if (--mp->refCnt > 0) {
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (mp->info && mp->info->fini) {
|
|||
|
|
mp->info->fini();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (mp->cdtors) {
|
|||
|
|
while (mp->cdtors->term) {
|
|||
|
|
mp->cdtors->term();
|
|||
|
|
mp->cdtors++;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
result = unload(mp->entry);
|
|||
|
|
if (result == -1) {
|
|||
|
|
errvalid++;
|
|||
|
|
strcpy(errbuf, strerror(errno));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (mp->exports) {
|
|||
|
|
ExportPtr ep;
|
|||
|
|
int i;
|
|||
|
|
for (ep = mp->exports, i = mp->nExports; i; i--, ep++) {
|
|||
|
|
if (ep->name) {
|
|||
|
|
free(ep->name);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
free(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;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
free(mp->name);
|
|||
|
|
free(mp);
|
|||
|
|
return result;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
static void
|
|||
|
|
terminate(void)
|
|||
|
|
{
|
|||
|
|
while (modList) {
|
|||
|
|
dlclose(modList);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* Build the export table from the XCOFF .loader section.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
static int
|
|||
|
|
readExports(
|
|||
|
|
ModulePtr mp)
|
|||
|
|
{
|
|||
|
|
LDFILE *ldp = NULL;
|
|||
|
|
SCNHDR sh, shdata;
|
|||
|
|
LDHDR *lhp;
|
|||
|
|
char *ldbuf;
|
|||
|
|
LDSYM *ls;
|
|||
|
|
int i;
|
|||
|
|
ExportPtr ep;
|
|||
|
|
const char *errMsg;
|
|||
|
|
|
|||
|
|
#define Error(msg) do{errMsg=(msg);goto error;}while(0)
|
|||
|
|
#define SysErr() Error(strerror(errno))
|
|||
|
|
|
|||
|
|
ldp = ldopen(mp->name, ldp);
|
|||
|
|
if (ldp == NULL) {
|
|||
|
|
struct ld_info *lp;
|
|||
|
|
char *buf;
|
|||
|
|
int size = 0;
|
|||
|
|
|
|||
|
|
if (errno != ENOENT) {
|
|||
|
|
SysErr();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* The module might be loaded due to the LIBPATH environment variable.
|
|||
|
|
* Search for the loaded module using L_GETINFO.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
while (1) {
|
|||
|
|
size += 4 * 1024;
|
|||
|
|
buf = malloc(size);
|
|||
|
|
if (buf == NULL) {
|
|||
|
|
SysErr();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
i = loadquery(L_GETINFO, buf, size);
|
|||
|
|
|
|||
|
|
if (i != -1) {
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
free(buf);
|
|||
|
|
if (errno != ENOMEM) {
|
|||
|
|
SysErr();
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* 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);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
free(buf);
|
|||
|
|
|
|||
|
|
if (!ldp) {
|
|||
|
|
SysErr();
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (TYPE(ldp) != U802TOCMAGIC) {
|
|||
|
|
Error("bad magic");
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* Get the padding for the data section. This is needed for AIX 4.1
|
|||
|
|
* compilers. This is used when building the final function pointer to the
|
|||
|
|
* exported symbol.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
if (ldnshread(ldp, _DATA, &shdata) != SUCCESS) {
|
|||
|
|
Error("cannot read data section header");
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
|
|||
|
|
Error("cannot read loader section header");
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* We read the complete loader section in one chunk, this makes finding
|
|||
|
|
* long symbol names residing in the string table easier.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
ldbuf = (char *) malloc(sh.s_size);
|
|||
|
|
if (ldbuf == NULL) {
|
|||
|
|
SysErr();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
|
|||
|
|
free(ldbuf);
|
|||
|
|
Error("cannot seek to loader section");
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
|
|||
|
|
free(ldbuf);
|
|||
|
|
Error("cannot read loader section");
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
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++;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
mp->exports = (ExportPtr) calloc(mp->nExports, sizeof(*mp->exports));
|
|||
|
|
if (mp->exports == NULL) {
|
|||
|
|
free(ldbuf);
|
|||
|
|
SysErr();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* 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!=0 ; i--,ls++) {
|
|||
|
|
char *symname;
|
|||
|
|
char tmpsym[SYMNMLEN+1];
|
|||
|
|
|
|||
|
|
if (!LDR_EXPORT(*ls)) {
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (ls->l_zeroes == 0) {
|
|||
|
|
symname = ls->l_offset + lhp->l_stoff + ldbuf;
|
|||
|
|
} else {
|
|||
|
|
/*
|
|||
|
|
* The l_name member is not zero terminated, we must copy the
|
|||
|
|
* first SYMNMLEN chars and make sure we have a zero byte at the
|
|||
|
|
* end.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
strncpy(tmpsym, ls->l_name, SYMNMLEN);
|
|||
|
|
tmpsym[SYMNMLEN] = '\0';
|
|||
|
|
symname = tmpsym;
|
|||
|
|
}
|
|||
|
|
ep->name = malloc(strlen(symname) + 1);
|
|||
|
|
strcpy(ep->name, symname);
|
|||
|
|
ep->addr = (void *)((unsigned long)
|
|||
|
|
mp->entry + ls->l_value - shdata.s_vaddr);
|
|||
|
|
ep++;
|
|||
|
|
}
|
|||
|
|
free(ldbuf);
|
|||
|
|
while (ldclose(ldp) == FAILURE) {
|
|||
|
|
/* Empty body */
|
|||
|
|
}
|
|||
|
|
return 0;
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* This is a factoring out of the error-handling code to make the rest of
|
|||
|
|
* the function much simpler to read.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
error:
|
|||
|
|
errvalid++;
|
|||
|
|
strcpy(errbuf, "readExports: ");
|
|||
|
|
strcat(errbuf, errMsg);
|
|||
|
|
|
|||
|
|
if (ldp != NULL) {
|
|||
|
|
while (ldclose(ldp) == FAILURE) {
|
|||
|
|
/* Empty body */
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
return -1;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* 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;
|
|||
|
|
|
|||
|
|
buf = malloc(size);
|
|||
|
|
if (buf == NULL) {
|
|||
|
|
goto error;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
|
|||
|
|
free(buf);
|
|||
|
|
size += 4*1024;
|
|||
|
|
buf = malloc(size);
|
|||
|
|
if (buf == NULL) {
|
|||
|
|
goto error;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (i == -1) {
|
|||
|
|
free(buf);
|
|||
|
|
goto error;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* 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;
|
|||
|
|
free(buf);
|
|||
|
|
return ret;
|
|||
|
|
|
|||
|
|
error:
|
|||
|
|
errvalid++;
|
|||
|
|
strcpy(errbuf, "findMain: ");
|
|||
|
|
strcat(errbuf, strerror(errno));
|
|||
|
|
return NULL;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* Local Variables:
|
|||
|
|
* mode: c
|
|||
|
|
* c-basic-offset: 4
|
|||
|
|
* fill-column: 78
|
|||
|
|
* End:
|
|||
|
|
*/
|