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 extern FILE *gz_open(FILE *compressed_file, int *pid)
36 if (pipe(unzip_pipe)!=0) {
37 error_msg("pipe error");
40 if ((*pid = fork()) == -1) {
41 error_msg("fork failed");
47 unzip(compressed_file, fdopen(unzip_pipe[1], "w"));
49 fclose(compressed_file);
54 if (unzip_pipe[0] == -1) {
55 error_msg("gzip stream init failed");
57 return(fdopen(unzip_pipe[0], "r"));
60 /* gz_open implementation using gunzip and a vfork/exec -- dodges OOM killer */
61 extern FILE *gzvopen(FILE *compressed_file, int *pid)
67 /* create a new file descriptor for the input stream
68 * (it *must* be associated with a file)
69 * and seek to the same position in that fd as the stream.
71 cfile = dup(fileno(compressed_file));
72 floc = ftello(compressed_file);
73 lseek(cfile, floc, SEEK_SET);
76 if (pipe(unzip_pipe)!=0) {
77 error_msg("gzvopen(): pipe error");
84 error_msg("gzvopen(): fork failed");
89 /* child process - reads STDIN, writes to pipe */
91 /* close unused read end of pipe */
94 /* connect child's stdout to the pipe write end */
95 dup2(unzip_pipe[1], 1);
97 /* connect child's stdin to the fd passed in to us */
100 /* execute the gunzip utility */
101 execlp("gunzip","gunzip",NULL);
103 /* if we get here, we had a failure - since we are
104 * using vfork(), we cannot call exit(), must call _exit().
109 /* Parent process is executing here */
111 /* we have no more need of the duplicate fd */
114 /* close the write end of the pipe */
115 close(unzip_pipe[1]);
117 /* return the read end of the pipe as a FILE */
118 return(fdopen(unzip_pipe[0], "r"));
121 extern void gzvclose(int gunzip_pid)
123 if (kill(gunzip_pid, SIGTERM) == -1) {
124 perror("gzvclose()");
125 fprintf(stderr,"%s: unable to kill gunzip pid.\n",
129 if (waitpid(gunzip_pid, NULL, 0) == -1) {
130 fprintf(stderr,"%s: unable to wait on gunzip pid.\n",