busybox/libbb/gz_open.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) many different people.  If you wrote this, please
 * acknowledge your work.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "libbb.h"

extern FILE *gz_open(FILE *compressed_file, int *pid)
{
	int unzip_pipe[2];

	if (pipe(unzip_pipe)!=0) {
		error_msg("pipe error");
		return(NULL);
	}
	if ((*pid = fork()) == -1) {
		error_msg("fork failed");
		return(NULL);
	}
	if (*pid==0) {
		/* child process */
		close(unzip_pipe[0]);
		unzip(compressed_file, fdopen(unzip_pipe[1], "w"));
		fflush(NULL);
		fclose(compressed_file);
		close(unzip_pipe[1]);
		exit(EXIT_SUCCESS);
	}
	close(unzip_pipe[1]);
	if (unzip_pipe[0] == -1) {
		error_msg("gzip stream init failed");
	}
	return(fdopen(unzip_pipe[0], "r"));
}