| /* |
| * 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 Library 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 <stdlib.h> |
| #include <unistd.h> |
| |
| #include "libbb.h" |
| |
| /* transformer(), more than meets the eye */ |
| int open_transformer(int src_fd, int (*transformer)(int src_fd, int dst_fd)) |
| { |
| int fd_pipe[2]; |
| int pid; |
| |
| if (pipe(fd_pipe) != 0) { |
| bb_perror_msg_and_die("Can't create pipe"); |
| } |
| |
| pid = fork(); |
| if (pid == -1) { |
| bb_perror_msg_and_die("Fork failed"); |
| } |
| |
| if (pid == 0) { |
| /* child process */ |
| close(fd_pipe[0]); /* We don't wan't to read from the parent */ |
| transformer(src_fd, fd_pipe[1]); |
| close(fd_pipe[1]); /* Send EOF */ |
| close(src_fd); |
| exit(0); |
| /* notreached */ |
| } |
| |
| /* parent process */ |
| close(fd_pipe[1]); /* Don't want to write to the child */ |
| |
| return(fd_pipe[0]); |
| } |