1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) many different people. If you wrote this, please
6 * acknowledge your work.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
24 #include <sys/types.h>
32 static int gz_use_vfork;
35 gz_open(FILE *compressed_file, int *pid)
41 gz_use_vfork = (getenv("OPKG_USE_VFORK") != NULL);
44 /* Create a new file descriptor for the input stream
45 * (it *must* be associated with a file), and lseek()
46 * to the same position in that fd as the stream.
48 cfile = dup(fileno(compressed_file));
49 floc = ftello(compressed_file);
50 lseek(cfile, floc, SEEK_SET);
51 setenv("GZIP", "--quiet", 0);
54 if (pipe(unzip_pipe)!=0) {
59 /* If we don't flush, we end up with two copies of anything pending,
60 one from the parent, one from the child */
79 dup2(unzip_pipe[1], 1);
81 execlp("gunzip","gunzip",NULL);
82 /* If we get here, we had a failure */
85 unzip(compressed_file, fdopen(unzip_pipe[1], "w"));
87 fclose(compressed_file);
92 /* Parent process is executing here */
97 return(fdopen(unzip_pipe[0], "r"));
101 gz_close(int gunzip_pid)
107 /* The gunzip process remains running in the background if we
108 * used the vfork()/exec() technique - so we have to kill it
109 * forcibly. There might be a better way to do this, but that
110 * affect a lot of other parts of opkg, and this works fine.
112 if (kill(gunzip_pid, SIGTERM) == -1) {
113 perror_msg("gz_close(): unable to kill gunzip pid.");
119 if (waitpid(gunzip_pid, &status, 0) == -1) {
120 perror_msg("waitpid");
125 /* Bail out here if we used the vfork()/exec() technique. */
129 if (WIFSIGNALED(status)) {
130 error_msg("Unzip process killed by signal %d.\n",
135 if (!WIFEXITED(status)) {
136 /* shouldn't happen */
137 error_msg("Your system is broken: got status %d from waitpid.\n",
142 if ((ret = WEXITSTATUS(status))) {
143 error_msg("Unzip process failed with return code %d.\n",