libbb/gz_open.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Utility routines.
   4  *
   5  * Copyright (C) many different people.  If you wrote this, please
   6  * acknowledge your work.
   7  *
   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.
  12  *
  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.
  17  *
  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
  21  * USA
  22  */
  23
  24 #include <sys/types.h>
  25 #include <sys/wait.h>
  26 #include <signal.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include "libbb.h"
  31
  32 extern FILE *gz_open(FILE *compressed_file, int *pid)
  33 {
  34         int unzip_pipe[2];
  35
  36         if (pipe(unzip_pipe)!=0) {
  37                 error_msg("pipe error");
  38                 return(NULL);
  39         }
  40         if ((*pid = fork()) == -1) {
  41                 error_msg("fork failed");
  42                 return(NULL);
  43         }
  44         if (*pid==0) {
  45                 /* child process */
  46                 close(unzip_pipe[0]);
  47                 unzip(compressed_file, fdopen(unzip_pipe[1], "w"));
  48                 fflush(NULL);
  49                 fclose(compressed_file);
  50                 close(unzip_pipe[1]);
  51                 exit(EXIT_SUCCESS);
  52         }
  53         close(unzip_pipe[1]);
  54         if (unzip_pipe[0] == -1) {
  55                 error_msg("gzip stream init failed");
  56         }
  57         return(fdopen(unzip_pipe[0], "r"));
  58 }