OLD | NEW |
(Empty) | |
| 1 /* Invoke pipe, but avoid some glitches. |
| 2 Copyright (C) 2005, 2006 Free Software Foundation, Inc. |
| 3 |
| 4 This program is free software: you can redistribute it and/or modify |
| 5 it under the terms of the GNU General Public License as published by |
| 6 the Free Software Foundation; either version 3 of the License, or |
| 7 (at your option) any later version. |
| 8 |
| 9 This program is distributed in the hope that it will be useful, |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 GNU General Public License for more details. |
| 13 |
| 14 You should have received a copy of the GNU General Public License |
| 15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 16 |
| 17 /* Written by Jim Meyering. */ |
| 18 |
| 19 #include <config.h> |
| 20 |
| 21 #include "unistd-safer.h" |
| 22 #include "subpipe.h" |
| 23 |
| 24 #include <unistd.h> |
| 25 #include <errno.h> |
| 26 |
| 27 /* Like pipe, but ensure that neither of the file descriptors is |
| 28 STDIN_FILENO, STDOUT_FILENO, or STDERR_FILENO. Fail with ENOSYS on |
| 29 platforms that lack pipe. */ |
| 30 |
| 31 int |
| 32 pipe_safer (int fd[2]) |
| 33 { |
| 34 #if HAVE_PIPE |
| 35 if (pipe (fd) == 0) |
| 36 { |
| 37 int i; |
| 38 for (i = 0; i < 2; i++) |
| 39 { |
| 40 fd[i] = fd_safer (fd[i]); |
| 41 if (fd[i] < 0) |
| 42 { |
| 43 int e = errno; |
| 44 close (fd[1 - i]); |
| 45 errno = e; |
| 46 return -1; |
| 47 } |
| 48 } |
| 49 |
| 50 return 0; |
| 51 } |
| 52 #else |
| 53 errno = ENOSYS; |
| 54 #endif |
| 55 |
| 56 return -1; |
| 57 } |
OLD | NEW |