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
;
34 FILE *gz_open(FILE * compressed_file
, int *pid
)
40 gz_use_vfork
= (getenv("OPKG_USE_VFORK") != NULL
);
43 /* Create a new file descriptor for the input stream
44 * (it *must* be associated with a file), and lseek()
45 * to the same position in that fd as the stream.
47 cfile
= dup(fileno(compressed_file
));
48 floc
= ftello(compressed_file
);
49 lseek(cfile
, floc
, SEEK_SET
);
50 setenv("GZIP", "--quiet", 0);
53 if (pipe(unzip_pipe
) != 0) {
58 /* If we don't flush, we end up with two copies of anything pending,
59 one from the parent, one from the child */
78 dup2(unzip_pipe
[1], 1);
80 execlp("gunzip", "gunzip", NULL
);
81 /* If we get here, we had a failure */
84 unzip(compressed_file
, fdopen(unzip_pipe
[1], "w"));
86 fclose(compressed_file
);
91 /* Parent process is executing here */
96 return (fdopen(unzip_pipe
[0], "r"));
99 int gz_close(int gunzip_pid
)
105 /* The gunzip process remains running in the background if we
106 * used the vfork()/exec() technique - so we have to kill it
107 * forcibly. There might be a better way to do this, but that
108 * affect a lot of other parts of opkg, and this works fine.
110 if (kill(gunzip_pid
, SIGTERM
) == -1) {
111 perror_msg("gz_close(): unable to kill gunzip pid.");
116 if (waitpid(gunzip_pid
, &status
, 0) == -1) {
117 perror_msg("waitpid");
122 /* Bail out here if we used the vfork()/exec() technique. */
126 if (WIFSIGNALED(status
)) {
127 error_msg("Unzip process killed by signal %d.\n",
132 if (!WIFEXITED(status
)) {
133 /* shouldn't happen */
135 ("Your system is broken: got status %d from waitpid.\n",
140 if ((ret
= WEXITSTATUS(status
))) {
141 error_msg("Unzip process failed with return code %d.\n", ret
);