The Tor Browser: nsprpub/pr/src/linking/prlink.c@ca08bd8f51b2 (annotated)

nsprpub/pr/src/linking/prlink.c@ca08bd8f51b2 (annotated)

nsprpub/pr/src/linking/prlink.c

Wed, 31 Dec 2014 06:55:46 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:46 +0100
changeset 1: ca08bd8f51b2
permissions: -rw-r--r--

Added tag TORBROWSER_REPLICA for changeset 6474c204b198

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "primpl.h"
 #include <string.h>
 #ifdef XP_BEOS
 #include <image.h>
 #endif
 #if defined(XP_MACOSX) && defined(USE_MACH_DYLD)
 #include <Carbon/Carbon.h>
 #include <CoreFoundation/CoreFoundation.h>
 #endif
 #ifdef XP_UNIX
 #ifdef USE_DLFCN
 #include <dlfcn.h>
 /* Define these on systems that don't have them. */
 #ifndef RTLD_NOW
 #define RTLD_NOW 0
 #endif
 #ifndef RTLD_LAZY
 #define RTLD_LAZY RTLD_NOW
 #endif
 #ifndef RTLD_GLOBAL
 #define RTLD_GLOBAL 0
 #endif
 #ifndef RTLD_LOCAL
 #define RTLD_LOCAL 0
 #endif
 #ifdef AIX
 #include <sys/ldr.h>
 #ifndef L_IGNOREUNLOAD /* AIX 4.3.3 does not have L_IGNOREUNLOAD. */
 #define L_IGNOREUNLOAD 0x10000000
 #endif
 #endif
 #ifdef OSF1
 #include <loader.h>
 #include <rld_interface.h>
 #endif
 #elif defined(USE_HPSHL)
 #include <dl.h>
 #elif defined(USE_MACH_DYLD)
 #include <mach-o/dyld.h>
 #endif
 #endif /* XP_UNIX */
 #define _PR_DEFAULT_LD_FLAGS PR_LD_LAZY
 /*
  * On these platforms, symbols have a leading '_'.
  */
 #if (defined(DARWIN) && defined(USE_MACH_DYLD)) \
     || defined(XP_OS2) \
     || ((defined(OPENBSD) || defined(NETBSD)) && !defined(__ELF__))
 #define NEED_LEADING_UNDERSCORE
 #endif
 #define PR_LD_PATHW 0x8000  /* for PR_LibSpec_PathnameU */
 /************************************************************************/
 struct PRLibrary {
     char*                       name;  /* Our own copy of the name string */
     PRLibrary*                  next;
     int                         refCount;
     const PRStaticLinkTable*    staticTable;
 #ifdef XP_PC
 #ifdef XP_OS2
     HMODULE                     dlh;
 #else
     HINSTANCE                   dlh;
 #endif
 #endif
 #if defined(XP_MACOSX) && defined(USE_MACH_DYLD)
     CFragConnectionID           connection;
     CFBundleRef                 bundle;
     Ptr                         main;
     CFMutableDictionaryRef      wrappers;
     const struct mach_header*   image;
 #endif
 #ifdef XP_UNIX
 #if defined(USE_HPSHL)
     shl_t                       dlh;
 #elif defined(USE_MACH_DYLD)
     NSModule                    dlh;
 #else
     void*                       dlh;
 #endif
 #endif
 #ifdef XP_BEOS
     void*                       dlh;
     void*                       stub_dlh;
 #endif
 };
 static PRLibrary *pr_loadmap;
 static PRLibrary *pr_exe_loadmap;
 static PRMonitor *pr_linker_lock;
 static char* _pr_currentLibPath = NULL;
 static PRLibrary *pr_LoadLibraryByPathname(const char *name, PRIntn flags);
 /************************************************************************/
 #if !defined(USE_DLFCN) && !defined(HAVE_STRERROR)
 #define ERR_STR_BUF_LENGTH    20
 #endif
 static void DLLErrorInternal(PRIntn oserr)
 /*
 ** This whole function, and most of the code in this file, are run
 ** with a big hairy lock wrapped around it. Not the best of situations,
 ** but will eventually come up with the right answer.
 */
 {
     const char *error = NULL;
 #ifdef USE_DLFCN
     error = dlerror();  /* $$$ That'll be wrong some of the time - AOF */
 #elif defined(HAVE_STRERROR)
     error = strerror(oserr);  /* this should be okay */
 #else
     char errStrBuf[ERR_STR_BUF_LENGTH];
     PR_snprintf(errStrBuf, sizeof(errStrBuf), "error %d", oserr);
     error = errStrBuf;
 #endif
     if (NULL != error)
         PR_SetErrorText(strlen(error), error);
 }  /* DLLErrorInternal */
 void _PR_InitLinker(void)
 {
     PRLibrary *lm = NULL;
 #if defined(XP_UNIX)
     void *h;
 #endif
     if (!pr_linker_lock) {
         pr_linker_lock = PR_NewNamedMonitor("linker-lock");
     }
     PR_EnterMonitor(pr_linker_lock);
 #if defined(XP_PC)
     lm = PR_NEWZAP(PRLibrary);
     lm->name = strdup("Executable");
 #if defined(XP_OS2)
     lm->dlh = NULLHANDLE;
 #else
     /* A module handle for the executable. */
     lm->dlh = GetModuleHandle(NULL);
 #endif /* ! XP_OS2 */
     lm->refCount    = 1;
     lm->staticTable = NULL;
     pr_exe_loadmap  = lm;
     pr_loadmap      = lm;
 #elif defined(XP_UNIX)
 #ifdef HAVE_DLL
 #if defined(USE_DLFCN) && !defined(NO_DLOPEN_NULL)
     h = dlopen(0, RTLD_LAZY);
     if (!h) {
         char *error;
         DLLErrorInternal(_MD_ERRNO());
         error = (char*)PR_MALLOC(PR_GetErrorTextLength());
         (void) PR_GetErrorText(error);
         fprintf(stderr, "failed to initialize shared libraries [%s]\n",
             error);
         PR_DELETE(error);
         abort();/* XXX */
     }
 #elif defined(USE_HPSHL)
     h = NULL;
     /* don't abort with this NULL */
 #elif defined(USE_MACH_DYLD) || defined(NO_DLOPEN_NULL)
     h = NULL; /* XXXX  toshok */ /* XXXX  vlad */
 #else
 #error no dll strategy
 #endif /* USE_DLFCN */
     lm = PR_NEWZAP(PRLibrary);
     if (lm) {
         lm->name = strdup("a.out");
         lm->refCount = 1;
         lm->dlh = h;
         lm->staticTable = NULL;
     }
     pr_exe_loadmap = lm;
     pr_loadmap = lm;
 #endif /* HAVE_DLL */
 #endif /* XP_UNIX */
     if (lm) {
         PR_LOG(_pr_linker_lm, PR_LOG_MIN,
             ("Loaded library %s (init)", lm->name));
     }
     PR_ExitMonitor(pr_linker_lock);
 }
 /*
  * _PR_ShutdownLinker does not unload the dlls loaded by the application
  * via calls to PR_LoadLibrary.  Any dlls that still remain on the
  * pr_loadmap list when NSPR shuts down are application programming errors.
  * The only exception is pr_exe_loadmap, which was added to the list by
  * NSPR and hence should be cleaned up by NSPR.
  */
 void _PR_ShutdownLinker(void)
 {
     /* FIXME: pr_exe_loadmap should be destroyed. */
     PR_DestroyMonitor(pr_linker_lock);
     pr_linker_lock = NULL;
     if (_pr_currentLibPath) {
         free(_pr_currentLibPath);
         _pr_currentLibPath = NULL;
     }
 }
 /******************************************************************************/
 PR_IMPLEMENT(PRStatus) PR_SetLibraryPath(const char *path)
 {
     PRStatus rv = PR_SUCCESS;
     if (!_pr_initialized) _PR_ImplicitInitialization();
     PR_EnterMonitor(pr_linker_lock);
     if (_pr_currentLibPath) {
         free(_pr_currentLibPath);
     }
     if (path) {
         _pr_currentLibPath = strdup(path);
         if (!_pr_currentLibPath) {
             PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
         rv = PR_FAILURE;
         }
     } else {
         _pr_currentLibPath = 0;
     }
     PR_ExitMonitor(pr_linker_lock);
     return rv;
 }
 /*
 ** Return the library path for finding shared libraries.
 */
 PR_IMPLEMENT(char *)
 PR_GetLibraryPath(void)
 {
     char *ev;
     char *copy = NULL;  /* a copy of _pr_currentLibPath */
     if (!_pr_initialized) _PR_ImplicitInitialization();
     PR_EnterMonitor(pr_linker_lock);
     if (_pr_currentLibPath != NULL) {
         goto exit;
     }
     /* initialize pr_currentLibPath */
 #ifdef XP_PC
     ev = getenv("LD_LIBRARY_PATH");
     if (!ev) {
     ev = ".;\\lib";
     }
     ev = strdup(ev);
 #endif
 #if defined(XP_UNIX) || defined(XP_BEOS)
 #if defined(USE_DLFCN) || defined(USE_MACH_DYLD) || defined(XP_BEOS)
     {
     char *p=NULL;
     int len;
 #ifdef XP_BEOS
     ev = getenv("LIBRARY_PATH");
     if (!ev) {
         ev = "%A/lib:/boot/home/config/lib:/boot/beos/system/lib";
     }
 #else
     ev = getenv("LD_LIBRARY_PATH");
     if (!ev) {
         ev = "/usr/lib:/lib";
     }
 #endif
     len = strlen(ev) + 1;        /* +1 for the null */
     p = (char*) malloc(len);
     if (p) {
         strcpy(p, ev);
     }   /* if (p)  */
     ev = p;
     PR_LOG(_pr_io_lm, PR_LOG_NOTICE, ("linker path '%s'", ev));
     }
 #else
     /* AFAIK there isn't a library path with the HP SHL interface --Rob */
     ev = strdup("");
 #endif
 #endif
     /*
      * If ev is NULL, we have run out of memory
      */
     _pr_currentLibPath = ev;
   exit:
     if (_pr_currentLibPath) {
         copy = strdup(_pr_currentLibPath);
     }
     PR_ExitMonitor(pr_linker_lock);
     if (!copy) {
         PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
     }
     return copy;
 }
 /*
 ** Build library name from path, lib and extensions
 */
 PR_IMPLEMENT(char*)
 PR_GetLibraryName(const char *path, const char *lib)
 {
     char *fullname;
 #ifdef XP_PC
     if (strstr(lib, PR_DLL_SUFFIX) == NULL)
     {
         if (path) {
             fullname = PR_smprintf("%s\\%s%s", path, lib, PR_DLL_SUFFIX);
         } else {
             fullname = PR_smprintf("%s%s", lib, PR_DLL_SUFFIX);
         }
     } else {
         if (path) {
             fullname = PR_smprintf("%s\\%s", path, lib);
         } else {
             fullname = PR_smprintf("%s", lib);
         }
     }
 #endif /* XP_PC */
 #if defined(XP_UNIX) || defined(XP_BEOS)
     if (strstr(lib, PR_DLL_SUFFIX) == NULL)
     {
         if (path) {
             fullname = PR_smprintf("%s/lib%s%s", path, lib, PR_DLL_SUFFIX);
         } else {
             fullname = PR_smprintf("lib%s%s", lib, PR_DLL_SUFFIX);
         }
     } else {
         if (path) {
             fullname = PR_smprintf("%s/%s", path, lib);
         } else {
             fullname = PR_smprintf("%s", lib);
         }
     }
 #endif /* XP_UNIX || XP_BEOS */
     return fullname;
 }
 /*
 ** Free the memory allocated, for the caller, by PR_GetLibraryName
 */
 PR_IMPLEMENT(void)
 PR_FreeLibraryName(char *mem)
 {
     PR_smprintf_free(mem);
 }
 static PRLibrary*
 pr_UnlockedFindLibrary(const char *name)
 {
     PRLibrary* lm = pr_loadmap;
     const char* np = strrchr(name, PR_DIRECTORY_SEPARATOR);
     np = np ? np + 1 : name;
     while (lm) {
     const char* cp = strrchr(lm->name, PR_DIRECTORY_SEPARATOR);
     cp = cp ? cp + 1 : lm->name;
 #ifdef WIN32
         /* Windows DLL names are case insensitive... */
     if (strcmpi(np, cp) == 0)
 #elif defined(XP_OS2)
     if (stricmp(np, cp) == 0)
 #else
     if (strcmp(np, cp)  == 0)
 #endif
     {
         /* found */
         lm->refCount++;
         PR_LOG(_pr_linker_lm, PR_LOG_MIN,
            ("%s incr => %d (find lib)",
             lm->name, lm->refCount));
         return lm;
     }
     lm = lm->next;
     }
     return NULL;
 }
 PR_IMPLEMENT(PRLibrary*)
 PR_LoadLibraryWithFlags(PRLibSpec libSpec, PRIntn flags)
 {
     if (flags == 0) {
         flags = _PR_DEFAULT_LD_FLAGS;
     }
     switch (libSpec.type) {
         case PR_LibSpec_Pathname:
             return pr_LoadLibraryByPathname(libSpec.value.pathname, flags);
 #ifdef WIN32
         case PR_LibSpec_PathnameU:
             /*
              * cast to |char *| and set PR_LD_PATHW flag so that
              * it can be cast back to PRUnichar* in the callee.
              */
             return pr_LoadLibraryByPathname((const char*)
                                             libSpec.value.pathname_u,
                                             flags | PR_LD_PATHW);
 #endif
         default:
             PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
             return NULL;
     }
 }
 PR_IMPLEMENT(PRLibrary*)
 PR_LoadLibrary(const char *name)
 {
     PRLibSpec libSpec;
     libSpec.type = PR_LibSpec_Pathname;
     libSpec.value.pathname = name;
     return PR_LoadLibraryWithFlags(libSpec, 0);
 }
 #if defined(USE_MACH_DYLD)
 static NSModule
 pr_LoadMachDyldModule(const char *name)
 {
     NSObjectFileImage ofi;
     NSModule h = NULL;
     if (NSCreateObjectFileImageFromFile(name, &ofi)
             == NSObjectFileImageSuccess) {
         h = NSLinkModule(ofi, name, NSLINKMODULE_OPTION_PRIVATE
                          | NSLINKMODULE_OPTION_RETURN_ON_ERROR);
         if (h == NULL) {
             NSLinkEditErrors linkEditError;
             int errorNum;
             const char *fileName;
             const char *errorString;
             NSLinkEditError(&linkEditError, &errorNum, &fileName, &errorString);
             PR_LOG(_pr_linker_lm, PR_LOG_MIN,
                    ("LoadMachDyldModule error %d:%d for file %s:\n%s",
                     linkEditError, errorNum, fileName, errorString));
         }
         if (NSDestroyObjectFileImage(ofi) == FALSE) {
             if (h) {
                 (void)NSUnLinkModule(h, NSUNLINKMODULE_OPTION_NONE);
                 h = NULL;
             }
         }
     }
     return h;
 }
 #endif
 #if defined(XP_MACOSX) && defined(USE_MACH_DYLD)
 /*
 ** macLibraryLoadProc is a function definition for a Mac shared library
 ** loading method. The "name" param is the same full or partial pathname
 ** that was passed to pr_LoadLibraryByPathName. The function must fill
 ** in the fields of "lm" which apply to its library type. Returns
 ** PR_SUCCESS if successful.
 */
 typedef PRStatus (*macLibraryLoadProc)(const char *name, PRLibrary *lm);
 #ifdef __ppc__
 /*
 ** CFM and its TVectors only exist on PowerPC.  Other OS X architectures
 ** only use Mach-O as a native binary format.
 */
 static void* TV2FP(CFMutableDictionaryRef dict, const char* name, void *tvp)
 {
     static uint32 glue[6] = { 0x3D800000, 0x618C0000, 0x800C0000, 0x804C0004, 0x7C0903A6, 0x4E800420 };
     uint32* newGlue = NULL;
     if (tvp != NULL) {
         CFStringRef nameRef = CFStringCreateWithCString(NULL, name, kCFStringEncodingASCII);
         if (nameRef) {
             CFMutableDataRef glueData = (CFMutableDataRef) CFDictionaryGetValue(dict, nameRef);
             if (glueData == NULL) {
                 glueData = CFDataCreateMutable(NULL, sizeof(glue));
                 if (glueData != NULL) {
                     newGlue = (uint32*) CFDataGetMutableBytePtr(glueData);
                     memcpy(newGlue, glue, sizeof(glue));
                     newGlue[0] |= ((UInt32)tvp >> 16);
                     newGlue[1] |= ((UInt32)tvp & 0xFFFF);
                     MakeDataExecutable(newGlue, sizeof(glue));
                     CFDictionaryAddValue(dict, nameRef, glueData);
                     CFRelease(glueData);
                     PR_LOG(_pr_linker_lm, PR_LOG_MIN, ("TV2FP: created wrapper for CFM function %s().", name));
                 }
             } else {
                 PR_LOG(_pr_linker_lm, PR_LOG_MIN, ("TV2FP: found wrapper for CFM function %s().", name));
                 newGlue = (uint32*) CFDataGetMutableBytePtr(glueData);
             }
             CFRelease(nameRef);
         }
     }
     return newGlue;
 }
 static PRStatus
 pr_LoadViaCFM(const char *name, PRLibrary *lm)
 {
     OSErr err;
     Str255 errName;
     FSRef ref;
     FSSpec fileSpec;
     Boolean tempUnusedBool;
     /*
      * Make an FSSpec from the path name and call GetDiskFragment.
      */
     /* Use direct conversion of POSIX path to FSRef to FSSpec. */
     err = FSPathMakeRef((const UInt8*)name, &ref, NULL);
     if (err != noErr)
         return PR_FAILURE;
     err = FSGetCatalogInfo(&ref, kFSCatInfoNone, NULL, NULL,
                            &fileSpec, NULL);
     if (err != noErr)
         return PR_FAILURE;
     /* Resolve an alias if this was one */
     err = ResolveAliasFile(&fileSpec, true, &tempUnusedBool,
                            &tempUnusedBool);
     if (err != noErr)
         return PR_FAILURE;
     /* Finally, try to load the library */
     err = GetDiskFragment(&fileSpec, 0, kCFragGoesToEOF, fileSpec.name,
                           kLoadCFrag, &lm->connection, &lm->main, errName);
     if (err == noErr && lm->connection) {
         /*
          * if we're a mach-o binary, need to wrap all CFM function
          * pointers. need a hash-table of already seen function
          * pointers, etc.
          */
         lm->wrappers = CFDictionaryCreateMutable(NULL, 16,
                        &kCFTypeDictionaryKeyCallBacks,
                        &kCFTypeDictionaryValueCallBacks);
         if (lm->wrappers) {
             lm->main = TV2FP(lm->wrappers, "main", lm->main);
         } else
             err = memFullErr;
     }
     return (err == noErr) ? PR_SUCCESS : PR_FAILURE;
 }
 #endif /* __ppc__ */
 /*
 ** Creates a CFBundleRef if the pathname refers to a Mac OS X bundle
 ** directory. The caller is responsible for calling CFRelease() to
 ** deallocate.
 */
 static PRStatus
 pr_LoadCFBundle(const char *name, PRLibrary *lm)
 {
     CFURLRef bundleURL;
     CFBundleRef bundle = NULL;
     char pathBuf[PATH_MAX];
     const char *resolvedPath;
     CFStringRef pathRef;
     /* Takes care of relative paths and symlinks */
     resolvedPath = realpath(name, pathBuf);
     if (!resolvedPath)
         return PR_FAILURE;
     pathRef = CFStringCreateWithCString(NULL, pathBuf, kCFStringEncodingUTF8);
     if (pathRef) {
         bundleURL = CFURLCreateWithFileSystemPath(NULL, pathRef,
                                                   kCFURLPOSIXPathStyle, true);
         if (bundleURL) {
             bundle = CFBundleCreate(NULL, bundleURL);
             CFRelease(bundleURL);
         }
         CFRelease(pathRef);
     }
     lm->bundle = bundle;
     return (bundle != NULL) ? PR_SUCCESS : PR_FAILURE;
 }
 static PRStatus
 pr_LoadViaDyld(const char *name, PRLibrary *lm)
 {
     lm->dlh = pr_LoadMachDyldModule(name);
     if (lm->dlh == NULL) {
         lm->image = NSAddImage(name, NSADDIMAGE_OPTION_RETURN_ON_ERROR
                                | NSADDIMAGE_OPTION_WITH_SEARCHING);
         if (lm->image == NULL) {
             NSLinkEditErrors linkEditError;
             int errorNum;
             const char *fileName;
             const char *errorString;
             NSLinkEditError(&linkEditError, &errorNum, &fileName, &errorString);
             PR_LOG(_pr_linker_lm, PR_LOG_MIN,
                    ("LoadMachDyldModule error %d:%d for file %s:\n%s",
                     linkEditError, errorNum, fileName, errorString));
         }
     }
     return (lm->dlh != NULL || lm->image != NULL) ? PR_SUCCESS : PR_FAILURE;
 }
 #endif /* XP_MACOSX && USE_MACH_DYLD */
 /*
 ** Dynamically load a library. Only load libraries once, so scan the load
 ** map first.
 */
 static PRLibrary*
 pr_LoadLibraryByPathname(const char *name, PRIntn flags)
 {
     PRLibrary *lm;
     PRLibrary* result = NULL;
     PRInt32 oserr;
 #ifdef WIN32
     char utf8name_stack[MAX_PATH];
     char *utf8name_malloc = NULL;
     char *utf8name = utf8name_stack;
     PRUnichar wname_stack[MAX_PATH];
     PRUnichar *wname_malloc = NULL;
     PRUnichar *wname = wname_stack;
     int len;
 #endif
     if (!_pr_initialized) _PR_ImplicitInitialization();
     /* See if library is already loaded */
     PR_EnterMonitor(pr_linker_lock);
 #ifdef WIN32
     if (flags & PR_LD_PATHW) {
         /* cast back what's cast to |char *| for the argument passing. */
         wname = (LPWSTR) name;
     } else {
         int wlen = MultiByteToWideChar(CP_ACP, 0, name, -1, NULL, 0);
         if (wlen > MAX_PATH)
             wname = wname_malloc = PR_Malloc(wlen * sizeof(PRUnichar));
         if (wname == NULL ||
             !MultiByteToWideChar(CP_ACP, 0,  name, -1, wname, wlen)) {
             oserr = _MD_ERRNO();
             goto unlock;
         }
     }
     len = WideCharToMultiByte(CP_UTF8, 0, wname, -1, NULL, 0, NULL, NULL);
     if (len > MAX_PATH)
         utf8name = utf8name_malloc = PR_Malloc(len);
     if (utf8name == NULL ||
         !WideCharToMultiByte(CP_UTF8, 0, wname, -1,
                              utf8name, len, NULL, NULL)) {
         oserr = _MD_ERRNO();
         goto unlock;
     }
     /* the list of loaded library names are always kept in UTF-8
      * on Win32 platforms */
     result = pr_UnlockedFindLibrary(utf8name);
 #else
     result = pr_UnlockedFindLibrary(name);
 #endif
     if (result != NULL) goto unlock;
     lm = PR_NEWZAP(PRLibrary);
     if (lm == NULL) {
         oserr = _MD_ERRNO();
         goto unlock;
     }
     lm->staticTable = NULL;
 #ifdef XP_OS2  /* Why isn't all this stuff in MD code?! */
     {
         HMODULE h;
         UCHAR pszError[_MAX_PATH];
         ULONG ulRc = NO_ERROR;
           ulRc = DosLoadModule(pszError, _MAX_PATH, (PSZ) name, &h);
           if (ulRc != NO_ERROR) {
               oserr = ulRc;
               PR_DELETE(lm);
               goto unlock;
           }
           lm->name = strdup(name);
           lm->dlh  = h;
           lm->next = pr_loadmap;
           pr_loadmap = lm;
     }
 #endif /* XP_OS2 */
 #ifdef WIN32
     {
     HINSTANCE h;
     h = LoadLibraryExW(wname, NULL,
                        (flags & PR_LD_ALT_SEARCH_PATH) ?
                        LOAD_WITH_ALTERED_SEARCH_PATH : 0);
     if (h == NULL) {
         oserr = _MD_ERRNO();
         PR_DELETE(lm);
         goto unlock;
     }
     lm->name = strdup(utf8name);
     lm->dlh = h;
     lm->next = pr_loadmap;
     pr_loadmap = lm;
     }
 #endif /* WIN32 */
 #if defined(XP_MACOSX) && defined(USE_MACH_DYLD)
     {
     int     i;
     PRStatus status;
     static const macLibraryLoadProc loadProcs[] = {
 #ifdef __ppc__
         pr_LoadViaDyld, pr_LoadCFBundle, pr_LoadViaCFM
 #else  /* __ppc__ */
         pr_LoadViaDyld, pr_LoadCFBundle
 #endif /* __ppc__ */
     };
     for (i = 0; i < sizeof(loadProcs) / sizeof(loadProcs[0]); i++) {
         if ((status = loadProcs[i](name, lm)) == PR_SUCCESS)
             break;
     }
     if (status != PR_SUCCESS) {
         oserr = cfragNoLibraryErr;
         PR_DELETE(lm);
         goto unlock;
     }
     lm->name = strdup(name);
     lm->next = pr_loadmap;
     pr_loadmap = lm;
     }
 #endif
 #if defined(XP_UNIX) && !(defined(XP_MACOSX) && defined(USE_MACH_DYLD))
 #ifdef HAVE_DLL
     {
 #if defined(USE_DLFCN)
 #ifdef NTO
     /* Neutrino needs RTLD_GROUP to load Netscape plugins. (bug 71179) */
     int dl_flags = RTLD_GROUP;
 #elif defined(AIX)
     /* AIX needs RTLD_MEMBER to load an archive member.  (bug 228899) */
     int dl_flags = RTLD_MEMBER;
 #else
     int dl_flags = 0;
 #endif
     void *h = NULL;
     if (flags & PR_LD_LAZY) {
         dl_flags |= RTLD_LAZY;
     }
     if (flags & PR_LD_NOW) {
         dl_flags |= RTLD_NOW;
     }
     if (flags & PR_LD_GLOBAL) {
         dl_flags |= RTLD_GLOBAL;
     }
     if (flags & PR_LD_LOCAL) {
         dl_flags |= RTLD_LOCAL;
     }
 #if defined(DARWIN)
     /* ensure the file exists if it contains a slash character i.e. path */
     /* DARWIN's dlopen ignores the provided path and checks for the */
     /* plain filename in DYLD_LIBRARY_PATH */
     if (strchr(name, PR_DIRECTORY_SEPARATOR) == NULL ||
         PR_Access(name, PR_ACCESS_EXISTS) == PR_SUCCESS) {
             h = dlopen(name, dl_flags);
         }
 #else
     h = dlopen(name, dl_flags);
 #endif
 #elif defined(USE_HPSHL)
     int shl_flags = 0;
     shl_t h;
     /*
      * Use the DYNAMIC_PATH flag only if 'name' is a plain file
      * name (containing no directory) to match the behavior of
      * dlopen().
      */
     if (strchr(name, PR_DIRECTORY_SEPARATOR) == NULL) {
         shl_flags |= DYNAMIC_PATH;
     }
     if (flags & PR_LD_LAZY) {
         shl_flags |= BIND_DEFERRED;
     }
     if (flags & PR_LD_NOW) {
         shl_flags |= BIND_IMMEDIATE;
     }
     /* No equivalent of PR_LD_GLOBAL and PR_LD_LOCAL. */
     h = shl_load(name, shl_flags, 0L);
 #elif defined(USE_MACH_DYLD)
     NSModule h = pr_LoadMachDyldModule(name);
 #else
 #error Configuration error
 #endif
     if (!h) {
         oserr = _MD_ERRNO();
         PR_DELETE(lm);
         goto unlock;
     }
     lm->name = strdup(name);
     lm->dlh = h;
     lm->next = pr_loadmap;
     pr_loadmap = lm;
     }
 #endif /* HAVE_DLL */
 #endif /* XP_UNIX && !(XP_MACOSX && USE_MACH_DYLD) */
     lm->refCount = 1;
 #ifdef XP_BEOS
     {
         image_info info;
         int32 cookie = 0;
         image_id imageid = B_ERROR;
         image_id stubid = B_ERROR;
         PRLibrary *p;
         for (p = pr_loadmap; p != NULL; p = p->next) {
             /* hopefully, our caller will always use the same string
                to refer to the same library */
             if (strcmp(name, p->name) == 0) {
                 /* we've already loaded this library */
                 imageid = info.id;
                 lm->refCount++;
                 break;
             }
         }
         if(imageid == B_ERROR) {
             /* it appears the library isn't yet loaded - load it now */
             char stubName [B_PATH_NAME_LENGTH + 1];
             /* the following is a work-around to a "bug" in the beos -
                the beos system loader allows only 32M (system-wide)
                to be used by code loaded as "add-ons" (code loaded
                through the 'load_add_on()' system call, which includes
                mozilla components), but allows 256M to be used by
                shared libraries.
                unfortunately, mozilla is too large to fit into the
                "add-on" space, so we must trick the loader into
                loading some of the components as shared libraries.  this
                is accomplished by creating a "stub" add-on (an empty
                shared object), and linking it with the component
                (the actual .so file generated by the build process,
                without any modifications).  when this stub is loaded
                by load_add_on(), the loader will automatically load the
                component into the shared library space.
             */
             strcpy(stubName, name);
             strcat(stubName, ".stub");
             /* first, attempt to load the stub (thereby loading the
                component as a shared library */
             if ((stubid = load_add_on(stubName)) > B_ERROR) {
                 /* the stub was loaded successfully. */
                 imageid = B_FILE_NOT_FOUND;
                 cookie = 0;
                 while (get_next_image_info(0, &cookie, &info) == B_OK) {
                     const char *endOfSystemName = strrchr(info.name, '/');
                     const char *endOfPassedName = strrchr(name, '/');
                     if( 0 == endOfSystemName )
                         endOfSystemName = info.name;
                     else
                         endOfSystemName++;
                     if( 0 == endOfPassedName )
                         endOfPassedName = name;
                     else
                         endOfPassedName++;
                     if (strcmp(endOfSystemName, endOfPassedName) == 0) {
                         /* this is the actual component - remember it */
                         imageid = info.id;
                         break;
                     }
                 }
             } else {
                 /* we failed to load the "stub" - try to load the
                    component directly as an add-on */
                 stubid = B_ERROR;
                 imageid = load_add_on(name);
             }
         }
         if (imageid <= B_ERROR) {
             oserr = imageid;
             PR_DELETE( lm );
             goto unlock;
         }
         lm->name = strdup(name);
         lm->dlh = (void*)imageid;
         lm->stub_dlh = (void*)stubid;
         lm->next = pr_loadmap;
         pr_loadmap = lm;
     }
 #endif
     result = lm;    /* success */
     PR_LOG(_pr_linker_lm, PR_LOG_MIN, ("Loaded library %s (load lib)", lm->name));
   unlock:
     if (result == NULL) {
         PR_SetError(PR_LOAD_LIBRARY_ERROR, oserr);
         DLLErrorInternal(oserr);  /* sets error text */
     }
 #ifdef WIN32
     if (utf8name_malloc)
         PR_Free(utf8name_malloc);
     if (wname_malloc)
         PR_Free(wname_malloc);
 #endif
     PR_ExitMonitor(pr_linker_lock);
     return result;
 }
 /*
 ** Unload a shared library which was loaded via PR_LoadLibrary
 */
 PR_IMPLEMENT(PRStatus)
 PR_UnloadLibrary(PRLibrary *lib)
 {
     int result = 0;
     PRStatus status = PR_SUCCESS;
     if (lib == 0) {
         PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
         return PR_FAILURE;
     }
     PR_EnterMonitor(pr_linker_lock);
     if (lib->refCount <= 0) {
         PR_ExitMonitor(pr_linker_lock);
         PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
         return PR_FAILURE;
     }
     if (--lib->refCount > 0) {
     PR_LOG(_pr_linker_lm, PR_LOG_MIN,
            ("%s decr => %d",
         lib->name, lib->refCount));
     goto done;
     }
 #ifdef XP_BEOS
     if(((image_id)lib->stub_dlh) == B_ERROR)
         unload_add_on( (image_id) lib->dlh );
     else
         unload_add_on( (image_id) lib->stub_dlh);
 #endif
 #ifdef XP_UNIX
 #ifdef HAVE_DLL
 #ifdef USE_DLFCN
     result = dlclose(lib->dlh);
 #elif defined(USE_HPSHL)
     result = shl_unload(lib->dlh);
 #elif defined(USE_MACH_DYLD)
     if (lib->dlh)
         result = NSUnLinkModule(lib->dlh, NSUNLINKMODULE_OPTION_NONE) ? 0 : -1;
 #else
 #error Configuration error
 #endif
 #endif /* HAVE_DLL */
 #endif /* XP_UNIX */
 #ifdef XP_PC
     if (lib->dlh) {
         FreeLibrary((HINSTANCE)(lib->dlh));
         lib->dlh = (HINSTANCE)NULL;
     }
 #endif  /* XP_PC */
 #if defined(XP_MACOSX) && defined(USE_MACH_DYLD)
     /* Close the connection */
     if (lib->connection)
         CloseConnection(&(lib->connection));
     if (lib->bundle)
         CFRelease(lib->bundle);
     if (lib->wrappers)
         CFRelease(lib->wrappers);
     /* No way to unload an image (lib->image) */
 #endif
     /* unlink from library search list */
     if (pr_loadmap == lib)
         pr_loadmap = pr_loadmap->next;
     else if (pr_loadmap != NULL) {
         PRLibrary* prev = pr_loadmap;
         PRLibrary* next = pr_loadmap->next;
         while (next != NULL) {
             if (next == lib) {
                 prev->next = next->next;
                 goto freeLib;
             }
             prev = next;
             next = next->next;
         }
         /*
          * fail (the library is not on the _pr_loadmap list),
          * but don't wipe out an error from dlclose/shl_unload.
          */
         PR_ASSERT(!"_pr_loadmap and lib->refCount inconsistent");
         if (result == 0) {
             PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
             status = PR_FAILURE;
         }
     }
     /*
      * We free the PRLibrary structure whether dlclose/shl_unload
      * succeeds or not.
      */
   freeLib:
     PR_LOG(_pr_linker_lm, PR_LOG_MIN, ("Unloaded library %s", lib->name));
     free(lib->name);
     lib->name = NULL;
     PR_DELETE(lib);
     if (result != 0) {
         PR_SetError(PR_UNLOAD_LIBRARY_ERROR, _MD_ERRNO());
         DLLErrorInternal(_MD_ERRNO());
         status = PR_FAILURE;
     }
 done:
     PR_ExitMonitor(pr_linker_lock);
     return status;
 }
 static void*
 pr_FindSymbolInLib(PRLibrary *lm, const char *name)
 {
     void *f = NULL;
 #ifdef XP_OS2
     int rc;
 #endif
     if (lm->staticTable != NULL) {
         const PRStaticLinkTable* tp;
         for (tp = lm->staticTable; tp->name; tp++) {
             if (strcmp(name, tp->name) == 0) {
                 return (void*) tp->fp;
             }
         }
         /*
         ** If the symbol was not found in the static table then check if
         ** the symbol was exported in the DLL... Win16 only!!
         */
 #if !defined(WIN16) && !defined(XP_BEOS)
         PR_SetError(PR_FIND_SYMBOL_ERROR, 0);
         return (void*)NULL;
 #endif
     }
 #ifdef XP_OS2
     rc = DosQueryProcAddr(lm->dlh, 0, (PSZ) name, (PFN *) &f);
 #if defined(NEED_LEADING_UNDERSCORE)
     /*
      * Older plugins (not built using GCC) will have symbols that are not
      * underscore prefixed.  We check for that here.
      */
     if (rc != NO_ERROR) {
         name++;
         DosQueryProcAddr(lm->dlh, 0, (PSZ) name, (PFN *) &f);
     }
 #endif
 #endif  /* XP_OS2 */
 #ifdef WIN32
     f = GetProcAddress(lm->dlh, name);
 #endif  /* WIN32 */
 #if defined(XP_MACOSX) && defined(USE_MACH_DYLD)
 /* add this offset to skip the leading underscore in name */
 #define SYM_OFFSET 1
     if (lm->bundle) {
         CFStringRef nameRef = CFStringCreateWithCString(NULL, name + SYM_OFFSET, kCFStringEncodingASCII);
         if (nameRef) {
             f = CFBundleGetFunctionPointerForName(lm->bundle, nameRef);
             CFRelease(nameRef);
         }
     }
     if (lm->connection) {
         Ptr                 symAddr;
         CFragSymbolClass    symClass;
         Str255              pName;
         PR_LOG(_pr_linker_lm, PR_LOG_MIN, ("Looking up symbol: %s", name + SYM_OFFSET));
         c2pstrcpy(pName, name + SYM_OFFSET);
         f = (FindSymbol(lm->connection, pName, &symAddr, &symClass) == noErr) ? symAddr : NULL;
 #ifdef __ppc__
         /* callers expect mach-o function pointers, so must wrap tvectors with glue. */
         if (f && symClass == kTVectorCFragSymbol) {
             f = TV2FP(lm->wrappers, name + SYM_OFFSET, f);
         }
 #endif /* __ppc__ */
         if (f == NULL && strcmp(name + SYM_OFFSET, "main") == 0) f = lm->main;
     }
     if (lm->image) {
         NSSymbol symbol;
         symbol = NSLookupSymbolInImage(lm->image, name,
                  NSLOOKUPSYMBOLINIMAGE_OPTION_BIND
                  | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR);
         if (symbol != NULL)
             f = NSAddressOfSymbol(symbol);
         else
             f = NULL;
     }
 #undef SYM_OFFSET
 #endif /* XP_MACOSX && USE_MACH_DYLD */
 #ifdef XP_BEOS
     if( B_NO_ERROR != get_image_symbol( (image_id)lm->dlh, name, B_SYMBOL_TYPE_TEXT, &f ) ) {
         f = NULL;
     }
 #endif
 #ifdef XP_UNIX
 #ifdef HAVE_DLL
 #ifdef USE_DLFCN
     f = dlsym(lm->dlh, name);
 #elif defined(USE_HPSHL)
     if (shl_findsym(&lm->dlh, name, TYPE_PROCEDURE, &f) == -1) {
         f = NULL;
     }
 #elif defined(USE_MACH_DYLD)
     if (lm->dlh) {
         NSSymbol symbol;
         symbol = NSLookupSymbolInModule(lm->dlh, name);
         if (symbol != NULL)
             f = NSAddressOfSymbol(symbol);
         else
             f = NULL;
     }
 #endif
 #endif /* HAVE_DLL */
 #endif /* XP_UNIX */
     if (f == NULL) {
         PR_SetError(PR_FIND_SYMBOL_ERROR, _MD_ERRNO());
         DLLErrorInternal(_MD_ERRNO());
     }
     return f;
 }
 /*
 ** Called by class loader to resolve missing native's
 */
 PR_IMPLEMENT(void*)
 PR_FindSymbol(PRLibrary *lib, const char *raw_name)
 {
     void *f = NULL;
 #if defined(NEED_LEADING_UNDERSCORE)
     char *name;
 #else
     const char *name;
 #endif
     /*
     ** Mangle the raw symbol name in any way that is platform specific.
     */
 #if defined(NEED_LEADING_UNDERSCORE)
     /* Need a leading _ */
     name = PR_smprintf("_%s", raw_name);
 #elif defined(AIX)
     /*
     ** AIX with the normal linker put's a "." in front of the symbol
     ** name.  When use "svcc" and "svld" then the "." disappears. Go
     ** figure.
     */
     name = raw_name;
 #else
     name = raw_name;
 #endif
     PR_EnterMonitor(pr_linker_lock);
     PR_ASSERT(lib != NULL);
     f = pr_FindSymbolInLib(lib, name);
 #if defined(NEED_LEADING_UNDERSCORE)
     PR_smprintf_free(name);
 #endif
     PR_ExitMonitor(pr_linker_lock);
     return f;
 }
 /*
 ** Return the address of the function 'raw_name' in the library 'lib'
 */
 PR_IMPLEMENT(PRFuncPtr)
 PR_FindFunctionSymbol(PRLibrary *lib, const char *raw_name)
 {
     return ((PRFuncPtr) PR_FindSymbol(lib, raw_name));
 }
 PR_IMPLEMENT(void*)
 PR_FindSymbolAndLibrary(const char *raw_name, PRLibrary* *lib)
 {
     void *f = NULL;
 #if defined(NEED_LEADING_UNDERSCORE)
     char *name;
 #else
     const char *name;
 #endif
     PRLibrary* lm;
     if (!_pr_initialized) _PR_ImplicitInitialization();
     /*
     ** Mangle the raw symbol name in any way that is platform specific.
     */
 #if defined(NEED_LEADING_UNDERSCORE)
     /* Need a leading _ */
     name = PR_smprintf("_%s", raw_name);
 #elif defined(AIX)
     /*
     ** AIX with the normal linker put's a "." in front of the symbol
     ** name.  When use "svcc" and "svld" then the "." disappears. Go
     ** figure.
     */
     name = raw_name;
 #else
     name = raw_name;
 #endif
     PR_EnterMonitor(pr_linker_lock);
     /* search all libraries */
     for (lm = pr_loadmap; lm != NULL; lm = lm->next) {
         f = pr_FindSymbolInLib(lm, name);
         if (f != NULL) {
             *lib = lm;
             lm->refCount++;
             PR_LOG(_pr_linker_lm, PR_LOG_MIN,
                        ("%s incr => %d (for %s)",
                     lm->name, lm->refCount, name));
             break;
         }
     }
 #if defined(NEED_LEADING_UNDERSCORE)
     PR_smprintf_free(name);
 #endif
     PR_ExitMonitor(pr_linker_lock);
     return f;
 }
 PR_IMPLEMENT(PRFuncPtr)
 PR_FindFunctionSymbolAndLibrary(const char *raw_name, PRLibrary* *lib)
 {
     return ((PRFuncPtr) PR_FindSymbolAndLibrary(raw_name, lib));
 }
 /*
 ** Add a static library to the list of loaded libraries. If LoadLibrary
 ** is called with the name then we will pretend it was already loaded
 */
 PR_IMPLEMENT(PRLibrary*)
 PR_LoadStaticLibrary(const char *name, const PRStaticLinkTable *slt)
 {
     PRLibrary *lm=NULL;
     PRLibrary* result = NULL;
     if (!_pr_initialized) _PR_ImplicitInitialization();
     /* See if library is already loaded */
     PR_EnterMonitor(pr_linker_lock);
     /* If the lbrary is already loaded, then add the static table information... */
     result = pr_UnlockedFindLibrary(name);
     if (result != NULL) {
         PR_ASSERT( (result->staticTable == NULL) || (result->staticTable == slt) );
         result->staticTable = slt;
         goto unlock;
     }
     /* Add library to list...Mark it static */
     lm = PR_NEWZAP(PRLibrary);
     if (lm == NULL) goto unlock;
     lm->name = strdup(name);
     lm->refCount    = 1;
     lm->dlh         = pr_exe_loadmap ? pr_exe_loadmap->dlh : 0;
     lm->staticTable = slt;
     lm->next        = pr_loadmap;
     pr_loadmap      = lm;
     result = lm;    /* success */
     PR_ASSERT(lm->refCount == 1);
     PR_LOG(_pr_linker_lm, PR_LOG_MIN, ("Loaded library %s (static lib)", lm->name));
   unlock:
     PR_ExitMonitor(pr_linker_lock);
     return result;
 }
 PR_IMPLEMENT(char *)
 PR_GetLibraryFilePathname(const char *name, PRFuncPtr addr)
 {
 #if defined(USE_DLFCN) && defined(HAVE_DLADDR)
     Dl_info dli;
     char *result;
     if (dladdr((void *)addr, &dli) == 0) {
         PR_SetError(PR_LIBRARY_NOT_LOADED_ERROR, _MD_ERRNO());
         DLLErrorInternal(_MD_ERRNO());
         return NULL;
     }
     result = PR_Malloc(strlen(dli.dli_fname)+1);
     if (result != NULL) {
         strcpy(result, dli.dli_fname);
     }
     return result;
 #elif defined(USE_MACH_DYLD)
     char *result;
     const char *image_name;
     int i, count = _dyld_image_count();
     for (i = 0; i < count; i++) {
         image_name = _dyld_get_image_name(i);
         if (strstr(image_name, name) != NULL) {
             result = PR_Malloc(strlen(image_name)+1);
             if (result != NULL) {
                 strcpy(result, image_name);
             }
             return result;
         }
     }
     PR_SetError(PR_LIBRARY_NOT_LOADED_ERROR, 0);
     return NULL;
 #elif defined(AIX)
     char *result;
 #define LD_INFO_INCREMENT 64
     struct ld_info *info;
     unsigned int info_length = LD_INFO_INCREMENT * sizeof(struct ld_info);
     struct ld_info *infop;
     int loadflags = L_GETINFO | L_IGNOREUNLOAD;
     for (;;) {
         info = PR_Malloc(info_length);
         if (info == NULL) {
             return NULL;
         }
         /* If buffer is too small, loadquery fails with ENOMEM. */
         if (loadquery(loadflags, info, info_length) != -1) {
             break;
         }
         /*
          * Calling loadquery when compiled for 64-bit with the
          * L_IGNOREUNLOAD flag can cause an invalid argument error
          * on AIX 5.1. Detect this error the first time that
          * loadquery is called, and try calling it again without
          * this flag set.
          */
         if (errno == EINVAL && (loadflags & L_IGNOREUNLOAD)) {
             loadflags &= ~L_IGNOREUNLOAD;
             if (loadquery(loadflags, info, info_length) != -1) {
                 break;
             }
         }
         PR_Free(info);
         if (errno != ENOMEM) {
             /* should not happen */
             _PR_MD_MAP_DEFAULT_ERROR(_MD_ERRNO());
             return NULL;
         }
         /* retry with a larger buffer */
         info_length += LD_INFO_INCREMENT * sizeof(struct ld_info);
     }
     for (infop = info;
          ;
          infop = (struct ld_info *)((char *)infop + infop->ldinfo_next)) {
         unsigned long start = (unsigned long)infop->ldinfo_dataorg;
         unsigned long end = start + infop->ldinfo_datasize;
         if (start <= (unsigned long)addr && end > (unsigned long)addr) {
             result = PR_Malloc(strlen(infop->ldinfo_filename)+1);
             if (result != NULL) {
                 strcpy(result, infop->ldinfo_filename);
             }
             break;
         }
         if (!infop->ldinfo_next) {
             PR_SetError(PR_LIBRARY_NOT_LOADED_ERROR, 0);
             result = NULL;
             break;
         }
     }
     PR_Free(info);
     return result;
 #elif defined(OSF1)
     /* Contributed by Steve Streeter of HP */
     ldr_process_t process, ldr_my_process();
     ldr_module_t mod_id;
     ldr_module_info_t info;
     ldr_region_t regno;
     ldr_region_info_t reginfo;
     size_t retsize;
     int rv;
     char *result;
     /* Get process for which dynamic modules will be listed */
     process = ldr_my_process();
     /* Attach to process */
     rv = ldr_xattach(process);
     if (rv) {
         /* should not happen */
         _PR_MD_MAP_DEFAULT_ERROR(_MD_ERRNO());
         return NULL;
     }
     /* Print information for list of modules */
     mod_id = LDR_NULL_MODULE;
     for (;;) {
         /* Get information for the next module in the module list. */
         ldr_next_module(process, &mod_id);
         if (ldr_inq_module(process, mod_id, &info, sizeof(info),
                            &retsize) != 0) {
             /* No more modules */
             break;
         }
         if (retsize < sizeof(info)) {
             continue;
         }
         /*
          * Get information for each region in the module and check if any
          * contain the address of this function.
          */
         for (regno = 0; ; regno++) {
             if (ldr_inq_region(process, mod_id, regno, &reginfo,
                                sizeof(reginfo), &retsize) != 0) {
                 /* No more regions */
                 break;
             }
             if (((unsigned long)reginfo.lri_mapaddr <=
                 (unsigned long)addr) &&
                 (((unsigned long)reginfo.lri_mapaddr + reginfo.lri_size) >
                 (unsigned long)addr)) {
                 /* Found it. */
                 result = PR_Malloc(strlen(info.lmi_name)+1);
                 if (result != NULL) {
                     strcpy(result, info.lmi_name);
                 }
                 return result;
             }
         }
     }
     PR_SetError(PR_LIBRARY_NOT_LOADED_ERROR, 0);
     return NULL;
 #elif defined(HPUX) && defined(USE_HPSHL)
     int index;
     struct shl_descriptor desc;
     char *result;
     for (index = 0; shl_get_r(index, &desc) == 0; index++) {
         if (strstr(desc.filename, name) != NULL) {
             result = PR_Malloc(strlen(desc.filename)+1);
             if (result != NULL) {
                 strcpy(result, desc.filename);
             }
             return result;
         }
     }
     /*
      * Since the index value of a library is decremented if
      * a library preceding it in the shared library search
      * list was unloaded, it is possible that we missed some
      * libraries as we went up the list.  So we should go
      * down the list to be sure that we not miss anything.
      */
     for (index--; index >= 0; index--) {
         if ((shl_get_r(index, &desc) == 0)
                 && (strstr(desc.filename, name) != NULL)) {
             result = PR_Malloc(strlen(desc.filename)+1);
             if (result != NULL) {
                 strcpy(result, desc.filename);
             }
             return result;
         }
     }
     PR_SetError(PR_LIBRARY_NOT_LOADED_ERROR, 0);
     return NULL;
 #elif defined(HPUX) && defined(USE_DLFCN)
     struct load_module_desc desc;
     char *result;
     const char *module_name;
     if (dlmodinfo((unsigned long)addr, &desc, sizeof desc, NULL, 0, 0) == 0) {
         PR_SetError(PR_LIBRARY_NOT_LOADED_ERROR, _MD_ERRNO());
         DLLErrorInternal(_MD_ERRNO());
         return NULL;
     }
     module_name = dlgetname(&desc, sizeof desc, NULL, 0, 0);
     if (module_name == NULL) {
         /* should not happen */
         _PR_MD_MAP_DEFAULT_ERROR(_MD_ERRNO());
         DLLErrorInternal(_MD_ERRNO());
         return NULL;
     }
     result = PR_Malloc(strlen(module_name)+1);
     if (result != NULL) {
         strcpy(result, module_name);
     }
     return result;
 #elif defined(WIN32)
     PRUnichar wname[MAX_PATH];
     HMODULE handle = NULL;
     PRUnichar module_name[MAX_PATH];
     int len;
     char *result;
     if (MultiByteToWideChar(CP_ACP, 0, name, -1, wname, MAX_PATH)) {
         handle = GetModuleHandleW(wname);
     }
     if (handle == NULL) {
         PR_SetError(PR_LIBRARY_NOT_LOADED_ERROR, _MD_ERRNO());
         DLLErrorInternal(_MD_ERRNO());
         return NULL;
     }
     if (GetModuleFileNameW(handle, module_name, MAX_PATH) == 0) {
         /* should not happen */
         _PR_MD_MAP_DEFAULT_ERROR(_MD_ERRNO());
         return NULL;
     }
     len = WideCharToMultiByte(CP_ACP, 0, module_name, -1,
                               NULL, 0, NULL, NULL);
     if (len == 0) {
         _PR_MD_MAP_DEFAULT_ERROR(_MD_ERRNO());
         return NULL;
     }
     result = PR_Malloc(len * sizeof(PRUnichar));
     if (result != NULL) {
         WideCharToMultiByte(CP_ACP, 0, module_name, -1,
                             result, len, NULL, NULL);
     }
     return result;
 #elif defined(XP_OS2)
     HMODULE module = NULL;
     char module_name[_MAX_PATH];
     char *result;
     APIRET ulrc = DosQueryModFromEIP(&module, NULL, 0, NULL, NULL, (ULONG) addr);
     if ((NO_ERROR != ulrc) || (NULL == module) ) {
         PR_SetError(PR_LIBRARY_NOT_LOADED_ERROR, _MD_ERRNO());
         DLLErrorInternal(_MD_ERRNO());
         return NULL;
     }
     ulrc = DosQueryModuleName(module, sizeof module_name, module_name);
     if (NO_ERROR != ulrc) {
         /* should not happen */
         _PR_MD_MAP_DEFAULT_ERROR(_MD_ERRNO());
         return NULL;
     }
     result = PR_Malloc(strlen(module_name)+1);
     if (result != NULL) {
         strcpy(result, module_name);
     }
     return result;
 #else
     PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
     return NULL;
 #endif
 }

The Tor Browser / annotate

nsprpub/pr/src/linking/prlink.c@ca08bd8f51b2 (annotated)

nsprpub/pr/src/linking/prlink.c