109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
/*
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liboverride.c -- override function called by zip_open()
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Copyright (C) 2017-2022 Dieter Baron and Thomas Klausner
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This file is part of ckmame, a program to check rom sets for MAME.
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The authors can be contacted at <ckmame@nih.at>
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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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1. 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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2. 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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3. The name of the author may not be used to endorse or promote
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products derived from this software without specific prior
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written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
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OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef _WIN32
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int main(int argc, const char *argv[]) {
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/* Symbol override is not supported on Windows. */
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if (argc > 1 && strcmp(argv[1], "-v") == 0) {
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printf("not supported on Windows\n");
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}
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exit(1);
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}
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#else
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#include <errno.h>
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#include <unistd.h>
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#include "zip.h"
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/*
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Some systems bind functions called and defined within a shared library, so the override doesn't work. This program calls zip_open and checks whether the override worked.
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*/
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int
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main(int argc, const char *argv[]) {
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int verbose = 0;
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int error_code;
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if (argc > 1 && strcmp(argv[1], "-v") == 0) {
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verbose = 1;
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}
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if (getenv("LIBOVERRIDE_SET") == NULL) {
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char *cwd = getcwd(NULL, 0);
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size_t so_size = strlen(cwd) + 64;
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char *so = (char *)malloc(so_size);
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if (so == NULL) {
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if (verbose) {
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printf("malloc failed\n");
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}
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exit(2);
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}
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snprintf(so, so_size, "%s/libliboverride.so", cwd);
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setenv("LIBOVERRIDE_SET", "1", 1);
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setenv("LD_PRELOAD", so, 1);
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execv(argv[0], (void *)argv);
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if (verbose) {
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printf("exec failed: %s\n", strerror(errno));
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}
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exit(2);
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}
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if (zip_open("nosuchfile", 0, &error_code) != NULL) {
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/* We expect failure. */
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if (verbose) {
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printf("open succeeded\n");
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}
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exit(1);
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}
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if (error_code != 32000) {
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/* Override didn't take, we didn't get its magic error code. */
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if (verbose) {
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printf("got unexpected error %d\n", error_code);
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}
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exit(1);
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}
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if (verbose) {
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printf("success\n");
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}
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exit(0);
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}
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#endif /* not Windows */
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