148 lines
4.4 KiB
C
148 lines
4.4 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <string.h>
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#include <dlfcn.h>
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extern char *optarg;
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extern int optind, opterr, optopt;
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static struct option long_options[] = {
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{"library", required_argument, 0, 'l'},
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{"symbol", required_argument, 0, 's'},
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{"help", no_argument, 0, 'h'},
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{0, 0, 0, 0},
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};
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/* This array must parallel long_options[] */
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static const char *descriptions[] = {
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"specify a library path to look up symbol",
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"specify symbol to look up",
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"print this help screen",
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};
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void print_help(const char *name) {
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fprintf(stdout,
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"invokation:\n"
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"\t%s [-l <libname>] -s <symbol name>\n"
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"\t%s -h\n\n", name, name);
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fprintf(stdout, "options:\n");
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struct option *opt = long_options;
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const char **desc = descriptions;
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while (opt->name) {
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fprintf(stdout, "\t-%c/--%s%s: %s\n",
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opt->val,
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opt->name,
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(opt->has_arg ? " (argument)" : ""),
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*desc);
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opt++;
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desc++;
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}
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}
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int get_options(int argc, char **argv, char **lib, char **sym)
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{
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int c;
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*lib = 0;
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*sym = 0;
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while (1) {
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/* getopt_long stores the option index here. */
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int option_index = 0;
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c = getopt_long (argc, argv,
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"l:s:h",
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long_options,
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&option_index);
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/* Detect the end of the options. */
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if (c == -1) break;
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switch (c) {
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case 'l':
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*lib = strdup(optarg);
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break;
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case 's':
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*sym = strdup(optarg);
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break;
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case 'h': print_help(argv[0]); exit(EXIT_FAILURE); break;
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case '?':
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/* getopt_long already printed an error message. */
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break;
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default:
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fprintf(stderr, "Unknown option");
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exit(EXIT_FAILURE);
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}
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}
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return optind;
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}
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int main(int argc, char **argv)
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{
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char *libname, *symname, *prog = *argv;
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get_options(argc, argv, &libname, &symname);
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if (symname == NULL) {
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fprintf(stderr, "You must specify a symbol!\n");
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print_help(prog);
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exit(EXIT_FAILURE);
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}
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{
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const char *dlerr;
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void *handle, *symbol;
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printf("opening library [%s]\n", libname);
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dlerr = dlerror();
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handle = libname ? dlopen(libname, RTLD_NOW) : RTLD_DEFAULT;
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dlerr = dlerror();
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if (dlerr != NULL) fprintf(stderr, "dlopen() error: %s\n", dlerr);
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printf("opening symbol [%s]\n", symname);
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symbol = dlsym(handle, symname);
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dlerr = dlerror();
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if (dlerr != NULL) fprintf(stderr, "dlsym() error: %s\n", dlerr);
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printf("closing library [%s]\n", libname);
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dlclose(handle);
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dlerr = dlerror();
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if (dlerr != NULL) fprintf(stderr, "dlclose() error: %s\n", dlerr);
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else printf("successfully opened symbol\n");
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}
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if (libname != NULL) free(libname);
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if (symname != NULL) free(symname);
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return 0;
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}
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