+++ /dev/null
-/* Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-/*
- * dso.c -- DSO system function emulation for AIX
- *
- * This is *only* intended for AIX < 4.3.
- */
-
-/*
- * Based on libdl (dlfcn.c/dlfcn.h) which is
- * Copyright (c) 1992,1993,1995,1996,1997,1988
- * Jens-Uwe Mager, Helios Software GmbH, Hannover, Germany.
- *
- * Not derived from licensed software.
- *
- * Permission is granted to freely use, copy, modify, and redistribute
- * this software, provided that the author is not construed to be liable
- * for any results of using the software, alterations are clearly marked
- * as such, and this notice is not modified.
- *
- * Changes marked with `--jwe' were made on April 7 1996 by
- * John W. Eaton <jwe@bevo.che.wisc.edu> to support g++
- *
- * Bundled, stripped and adjusted on April 1998 as one single source file
- * for inclusion into the Apache HTTP server by
- * Ralf S. Engelschall <rse@apache.org>
- *
- * Added to APR by David Reid April 2000
- */
-
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/ldr.h>
-#include <a.out.h>
-#include "apr_arch_dso.h"
-#include "apr_portable.h"
-
-#if APR_HAS_DSO
-
-#undef FREAD
-#undef FWRITE
-#include <ldfcn.h>
-
-/*
- * AIX 4.3 does remove some useful definitions from ldfcn.h. Define
- * these here to compensate for that lossage.
- */
-#ifndef BEGINNING
-#define BEGINNING SEEK_SET
-#endif
-#ifndef FSEEK
-#define FSEEK(ldptr,o,p) fseek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr) +o):o,p)
-#endif
-#ifndef FREAD
-#define FREAD(p,s,n,ldptr) fread(p,s,n,IOPTR(ldptr))
-#endif
-
-/*
- * Mode flags for the dlopen routine.
- */
-#undef RTLD_LAZY
-#define RTLD_LAZY 1 /* lazy function call binding */
-#undef RTLD_NOW
-#define RTLD_NOW 2 /* immediate function call binding */
-#undef RTLD_GLOBAL
-#define RTLD_GLOBAL 0x100 /* allow symbols to be global */
-
-/*
- * To be able to initialize, a library may provide a dl_info structure
- * that contains functions to be called to initialize and terminate.
- */
-struct dl_info {
- void (*init) (void);
- void (*fini) (void);
-};
-
-/* APR functions...
- *
- * As the AIX functions have been declared in the header file we just
- * add the basic "wrappers" here.
- */
-
-APR_DECLARE(apr_status_t) apr_os_dso_handle_put(apr_dso_handle_t **aprdso,
- apr_os_dso_handle_t osdso,
- apr_pool_t *pool)
-{
- *aprdso = apr_pcalloc(pool, sizeof **aprdso);
- (*aprdso)->handle = osdso;
- (*aprdso)->pool = pool;
- return APR_SUCCESS;
-}
-
-APR_DECLARE(apr_status_t) apr_os_dso_handle_get(apr_os_dso_handle_t *osdso,
- apr_dso_handle_t *aprdso)
-{
- *osdso = aprdso->handle;
- return APR_SUCCESS;
-}
-
-static apr_status_t dso_cleanup(void *thedso)
-{
- apr_dso_handle_t *dso = thedso;
-
- if (dso->handle != NULL && dlclose(dso->handle) != 0)
- return APR_EINIT;
- dso->handle = NULL;
-
- return APR_SUCCESS;
-}
-
-APR_DECLARE(apr_status_t) apr_dso_load(apr_dso_handle_t **res_handle,
- const char *path, apr_pool_t *ctx)
-{
- void *os_handle = dlopen((char *)path, RTLD_NOW | RTLD_GLOBAL);
-
- *res_handle = apr_pcalloc(ctx, sizeof(*res_handle));
-
- if(os_handle == NULL) {
- (*res_handle)->errormsg = dlerror();
- return APR_EDSOOPEN;
- }
-
- (*res_handle)->handle = (void*)os_handle;
- (*res_handle)->pool = ctx;
- (*res_handle)->errormsg = NULL;
-
- apr_pool_cleanup_register(ctx, *res_handle, dso_cleanup, apr_pool_cleanup_null);
-
- return APR_SUCCESS;
-}
-
-APR_DECLARE(apr_status_t) apr_dso_unload(apr_dso_handle_t *handle)
-{
- return apr_pool_cleanup_run(handle->pool, handle, dso_cleanup);
-}
-
-APR_DECLARE(apr_status_t) apr_dso_sym(apr_dso_handle_sym_t *ressym,
- apr_dso_handle_t *handle,
- const char *symname)
-{
- void *retval = dlsym(handle->handle, symname);
-
- if (retval == NULL) {
- handle->errormsg = dlerror();
- return APR_ESYMNOTFOUND;
- }
-
- *ressym = retval;
- return APR_SUCCESS;
-}
-
-APR_DECLARE(const char *) apr_dso_error(apr_dso_handle_t *dso, char *buffer, apr_size_t buflen)
-{
- if (dso->errormsg) {
- apr_cpystrn(buffer, dso->errormsg, buflen);
- return dso->errormsg;
- }
- return "No Error";
-}
-
-
-
-/*
- * We simulate dlopen() et al. through a call to load. Because AIX has
- * no call to find an exported symbol we read the loader section of the
- * loaded module and build a list of exported symbols and their virtual
- * address.
- */
-
-typedef struct {
- char *name; /* the symbols's name */
- void *addr; /* its relocated virtual address */
-} Export, *ExportPtr;
-
-/*
- * xlC uses the following structure to list its constructors and
- * destructors. This is gleaned from the output of munch.
- */
-typedef struct {
- void (*init) (void); /* call static constructors */
- void (*term) (void); /* call static destructors */
-} Cdtor, *CdtorPtr;
-
-typedef void (*GccCDtorPtr) (void);
-
-/*
- * 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 */
- GccCDtorPtr gcc_ctor; /* g++ constructors --jwe */
- GccCDtorPtr gcc_dtor; /* g++ destructors --jwe */
- 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;
-
-/*
- * The `fixed' gcc header files on AIX 3.2.5 provide a prototype for
- * strdup(). --jwe
- */
-extern char *strdup(const char *);
-static void caterr(char *);
-static int readExports(ModulePtr);
-static void terminate(void);
-static void *findMain(void);
-
-void *dlopen(const char *path, int mode)
-{
- register ModulePtr mp;
- static void *mainModule;
-
- /*
- * Upon the first call register a terminate handler that will
- * close all libraries. Also get a reference to the main module
- * for use with loadbind.
- */
- if (!mainModule) {
- if ((mainModule = findMain()) == NULL)
- return NULL;
- atexit(terminate);
- }
- /*
- * Scan the list of modules if we have the module already loaded.
- */
- for (mp = modList; mp; mp = mp->next)
- if (strcmp(mp->name, path) == 0) {
- mp->refCnt++;
- return mp;
- }
- if ((mp = (ModulePtr) calloc(1, sizeof(*mp))) == NULL) {
- errvalid++;
- strcpy(errbuf, "calloc: ");
- strcat(errbuf, strerror(errno));
- return NULL;
- }
- if ((mp->name = strdup(path)) == NULL) {
- errvalid++;
- strcpy(errbuf, "strdup: ");
- strcat(errbuf, strerror(errno));
- free(mp);
- return NULL;
- }
- /*
- * load should be declared load(const char *...). Thus we
- * cast the path to a normal char *. Ugly.
- */
- if ((mp->entry = (void *) loadAndInit((char *) path, L_NOAUTODEFER, NULL)) == 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 *)];
- if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1)
- strcpy(errbuf, strerror(errno));
- else {
- char **p;
- for (p = tmp; *p; p++)
- caterr(*p);
- }
- }
- else
- strcat(errbuf, strerror(errno));
- return NULL;
- }
- mp->refCnt = 1;
- mp->next = modList;
- modList = mp;
- if (loadbind(0, mainModule, mp->entry) == -1) {
- dlclose(mp);
- errvalid++;
- strcpy(errbuf, "loadbind: ");
- strcat(errbuf, strerror(errno));
- return NULL;
- }
- /*
- * If the user wants global binding, loadbind against all other
- * loaded modules.
- */
- if (mode & RTLD_GLOBAL) {
- register ModulePtr mp1;
- for (mp1 = mp->next; mp1; mp1 = mp1->next)
- if (loadbind(0, mp1->entry, mp->entry) == -1) {
- dlclose(mp);
- errvalid++;
- strcpy(errbuf, "loadbind: ");
- strcat(errbuf, strerror(errno));
- return NULL;
- }
- }
- 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")) {
- CdtorPtr cp = mp->cdtors;
- while (cp->init || cp->term) {
- if (cp->init && cp->init != (void (*)(void)) 0xffffffff)
- (*cp->init) ();
- cp++;
- }
- /*
- * If the shared object was compiled using g++, we will need
- * to call global constructors using the _GLOBAL__DI function,
- * and later, global destructors using the _GLOBAL_DD
- * funciton. --jwe
- */
- }
- else if (mp->gcc_ctor = (GccCDtorPtr) dlsym(mp, "_GLOBAL__DI")) {
- (*mp->gcc_ctor) ();
- mp->gcc_dtor = (GccCDtorPtr) dlsym(mp, "_GLOBAL__DD");
- }
- else
- errvalid = 0;
- return mp;
-}
-
-/*
- * Attempt to decipher an AIX loader error message and append it
- * to our static error message buffer.
- */
-static void caterr(char *s)
-{
- register char *p = s;
-
- while (*p >= '0' && *p <= '9')
- p++;
- switch (atoi(s)) {
- case L_ERROR_TOOMANY:
- strcat(errbuf, "to many errors");
- break;
- case L_ERROR_NOLIB:
- strcat(errbuf, "can't load library");
- strcat(errbuf, p);
- break;
- case L_ERROR_UNDEF:
- strcat(errbuf, "can't find symbol");
- strcat(errbuf, p);
- break;
- case L_ERROR_RLDBAD:
- strcat(errbuf, "bad RLD");
- strcat(errbuf, p);
- break;
- case L_ERROR_FORMAT:
- strcat(errbuf, "bad exec format in");
- strcat(errbuf, p);
- break;
- case L_ERROR_ERRNO:
- strcat(errbuf, strerror(atoi(++p)));
- break;
- default:
- strcat(errbuf, s);
- break;
- }
-}
-
-void *dlsym(void *handle, const char *symbol)
-{
- register ModulePtr mp = (ModulePtr) handle;
- register ExportPtr ep;
- register int i;
-
- /*
- * Could speed up 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;
-}
-
-const char *dlerror(void)
-{
- if (errvalid) {
- errvalid = 0;
- return errbuf;
- }
- return NULL;
-}
-
-int dlclose(void *handle)
-{
- register ModulePtr mp = (ModulePtr) handle;
- int result;
- register ModulePtr mp1;
-
- if (--mp->refCnt > 0)
- return 0;
- if (mp->info && mp->info->fini)
- (*mp->info->fini) ();
- if (mp->cdtors) {
- CdtorPtr cp = mp->cdtors;
- while (cp->init || cp->term) {
- if (cp->term && cp->init != (void (*)(void)) 0xffffffff)
- (*cp->term) ();
- cp++;
- }
- /*
- * If the function to handle global destructors for g++
- * exists, call it. --jwe
- */
- }
- else if (mp->gcc_dtor) {
- (*mp->gcc_dtor) ();
- }
- result = unload(mp->entry);
- if (result == -1) {
- errvalid++;
- strcpy(errbuf, strerror(errno));
- }
- if (mp->exports) {
- register ExportPtr ep;
- register 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;
- struct ld_info *lp;
- char *buf;
- int size = 4 * 1024;
- void *dataorg;
-
- /*
- * The module might be loaded due to the LIBPATH
- * environment variable. Search for the loaded
- * module using L_GETINFO.
- */
- if ((buf = malloc(size)) == NULL) {
- errvalid++;
- strcpy(errbuf, "readExports: ");
- strcat(errbuf, strerror(errno));
- return -1;
- }
- while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
- free(buf);
- size += 4 * 1024;
- if ((buf = malloc(size)) == NULL) {
- errvalid++;
- strcpy(errbuf, "readExports: ");
- strcat(errbuf, strerror(errno));
- return -1;
- }
- }
- if (i == -1) {
- errvalid++;
- strcpy(errbuf, "readExports: ");
- strcat(errbuf, strerror(errno));
- free(buf);
- return -1;
- }
- /*
- * Traverse the list of loaded modules. The entry point
- * returned by load() does actually point to the TOC
- * entry contained in the data segment.
- */
- lp = (struct ld_info *) buf;
- while (lp) {
- if ((unsigned long) mp->entry >= (unsigned long) lp->ldinfo_dataorg &&
- (unsigned long) mp->entry < (unsigned long) lp->ldinfo_dataorg +
- lp->ldinfo_datasize) {
- dataorg = lp->ldinfo_dataorg;
- 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) {
- errvalid++;
- strcpy(errbuf, "readExports: ");
- strcat(errbuf, strerror(errno));
- return -1;
- }
- if (TYPE(ldp) != U802TOCMAGIC) {
- errvalid++;
- strcpy(errbuf, "readExports: bad magic");
- while (ldclose(ldp) == FAILURE);
- return -1;
- }
- /*
- * 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) {
- errvalid++;
- strcpy(errbuf, "readExports: cannot read data section header");
- while (ldclose(ldp) == FAILURE);
- return -1;
- }
- if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
- errvalid++;
- strcpy(errbuf, "readExports: cannot read loader section header");
- while (ldclose(ldp) == FAILURE);
- return -1;
- }
- /*
- * We read the complete loader section in one chunk, this makes
- * finding long symbol names residing in the string table easier.
- */
- if ((ldbuf = (char *) malloc(sh.s_size)) == NULL) {
- errvalid++;
- strcpy(errbuf, "readExports: ");
- strcat(errbuf, strerror(errno));
- while (ldclose(ldp) == FAILURE);
- return -1;
- }
- if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
- errvalid++;
- strcpy(errbuf, "readExports: cannot seek to loader section");
- free(ldbuf);
- while (ldclose(ldp) == FAILURE);
- return -1;
- }
- if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
- errvalid++;
- strcpy(errbuf, "readExports: cannot read loader section");
- free(ldbuf);
- while (ldclose(ldp) == FAILURE);
- return -1;
- }
- lhp = (LDHDR *) ldbuf;
- ls = (LDSYM *) (ldbuf + LDHDRSZ);
- /*
- * Count the number of exports to include in our export table.
- */
- for (i = lhp->l_nsyms; i; i--, ls++) {
- if (!LDR_EXPORT(*ls))
- continue;
- mp->nExports++;
- }
- if ((mp->exports = (ExportPtr) calloc(mp->nExports, sizeof(*mp->exports))) == NULL) {
- errvalid++;
- strcpy(errbuf, "readExports: ");
- strcat(errbuf, strerror(errno));
- free(ldbuf);
- while (ldclose(ldp) == FAILURE);
- return -1;
- }
- /*
- * Fill in the export table. All entries are relative to
- * the beginning of the data origin.
- */
- ep = mp->exports;
- ls = (LDSYM *) (ldbuf + LDHDRSZ);
- for (i = lhp->l_nsyms; i; 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 = strdup(symname);
- ep->addr = (void *) ((unsigned long) dataorg +
- ls->l_value - shdata.s_vaddr);
- ep++;
- }
- free(ldbuf);
- while (ldclose(ldp) == FAILURE);
- return 0;
-}
-
-/*
- * Find the main modules data origin. This is used as export pointer
- * for loadbind() to be able to resolve references to the main part.
- */
-static void *findMain(void)
-{
- struct ld_info *lp;
- char *buf;
- int size = 4 * 1024;
- int i;
- void *ret;
-
- if ((buf = malloc(size)) == NULL) {
- errvalid++;
- strcpy(errbuf, "findMain: ");
- strcat(errbuf, strerror(errno));
- return NULL;
- }
- while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
- free(buf);
- size += 4 * 1024;
- if ((buf = malloc(size)) == NULL) {
- errvalid++;
- strcpy(errbuf, "findMain: ");
- strcat(errbuf, strerror(errno));
- return NULL;
- }
- }
- if (i == -1) {
- errvalid++;
- strcpy(errbuf, "findMain: ");
- strcat(errbuf, strerror(errno));
- free(buf);
- return NULL;
- }
- /*
- * The first entry is the main module. The data segment
- * starts with the TOC entries for all exports, so the
- * data segment origin works as argument for loadbind.
- */
- lp = (struct ld_info *) buf;
- ret = lp->ldinfo_dataorg;
- free(buf);
- return ret;
-}
-
-#endif
Code Review / bottlenecks.git / blobdiff