diff options
Diffstat (limited to 'rubbos/app/httpd-2.0.64/srclib/apr/dso/aix/dso.c')
| -rw-r--r-- | rubbos/app/httpd-2.0.64/srclib/apr/dso/aix/dso.c | 714 |
1 files changed, 714 insertions, 0 deletions
diff --git a/rubbos/app/httpd-2.0.64/srclib/apr/dso/aix/dso.c b/rubbos/app/httpd-2.0.64/srclib/apr/dso/aix/dso.c new file mode 100644 index 00000000..25f6262a --- /dev/null +++ b/rubbos/app/httpd-2.0.64/srclib/apr/dso/aix/dso.c @@ -0,0 +1,714 @@ +/* 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 |