Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1142 insertions, 0 deletions

diff --git a/nsprpub/pr/src/linking/prlink.c b/nsprpub/pr/src/linking/prlink.c
new file mode 100644
index 0000000000..011ff17e6b
--- /dev/null
+++ b/nsprpub/pr/src/linking/prlink.c
@@ -0,0 +1,1142 @@
+/* -*- 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_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
+#elif defined(USE_HPSHL)
+#include <dl.h>
+#endif
+#endif /* XP_UNIX */
+
+#define _PR_DEFAULT_LD_FLAGS PR_LD_LAZY
+
+/*
+ * On these platforms, symbols have a leading '_'.
+ */
+#if 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
+
+#ifdef XP_UNIX
+#if defined(USE_HPSHL)
+    shl_t                       dlh;
+#else
+    void*                       dlh;
+#endif
+#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(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)
+#if defined(USE_DLFCN)
+    {
+        char *p=NULL;
+        int len;
+
+        ev = getenv("LD_LIBRARY_PATH");
+        if (!ev) {
+            ev = "/usr/lib:/lib";
+        }
+        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)
+    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 */
+    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);
+}
+
+/*
+** 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_UNIX)
+#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 defined(DARWIN)
+        PRBool okToLoad = PR_FALSE;
+#endif
+
+        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)
+        /* If the file contains an absolute or relative path (slash)
+         * and the path doesn't look like a System path, then require
+         * the file exists.
+         * The reason is that DARWIN's dlopen ignores the provided path
+         * and checks for the plain filename in DYLD_LIBRARY_PATH,
+         * which could load an unexpected version of a library. */
+        if (strchr(name, PR_DIRECTORY_SEPARATOR) == NULL) {
+          /* no slash, allow to load from any location */
+          okToLoad = PR_TRUE;
+        } else {
+          const char systemPrefix1[] = "/System/";
+          const size_t systemPrefixLen1 = strlen(systemPrefix1);
+          const char systemPrefix2[] = "/usr/lib/";
+          const size_t systemPrefixLen2 = strlen(systemPrefix2);
+          const size_t name_len = strlen(name);
+          if (((name_len > systemPrefixLen1) &&
+               (strncmp(name, systemPrefix1, systemPrefixLen1) == 0)) ||
+             ((name_len > systemPrefixLen2) &&
+               (strncmp(name, systemPrefix2, systemPrefixLen2) == 0))) {
+            /* found at beginning, it's a system library.
+             * Skip filesystem check (required for macOS 11),
+             * allow loading from any location */
+            okToLoad = PR_TRUE;
+          } else if (PR_Access(name, PR_ACCESS_EXISTS) == PR_SUCCESS) {
+            /* file exists, allow to load */
+            okToLoad = PR_TRUE;
+          }
+        }
+        if (okToLoad) {
+          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);
+#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 */
+
+    lm->refCount = 1;
+
+    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_UNIX
+#ifdef HAVE_DLL
+#ifdef USE_DLFCN
+    result = dlclose(lib->dlh);
+#elif defined(USE_HPSHL)
+    result = shl_unload(lib->dlh);
+#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 */
+
+    /* 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_NOT_REACHED("_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)
+        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 */
+
+#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;
+    }
+#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(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(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
+}