| /* Pipe to a Subprocess |
| Copyright (C) 1991-2014 Free Software Foundation, Inc. |
| |
| 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, if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| void |
| write_data (FILE * stream) |
| { |
| int i; |
| for (i = 0; i < 100; i++) |
| fprintf (stream, "%d\n", i); |
| if (ferror (stream)) |
| { |
| fprintf (stderr, "Output to stream failed.\n"); |
| exit (EXIT_FAILURE); |
| } |
| } |
| |
| /*@group*/ |
| int |
| main (void) |
| { |
| FILE *output; |
| |
| output = popen ("more", "w"); |
| if (!output) |
| { |
| fprintf (stderr, |
| "incorrect parameters or too many files.\n"); |
| return EXIT_FAILURE; |
| } |
| write_data (output); |
| if (pclose (output) != 0) |
| { |
| fprintf (stderr, |
| "Could not run more or other error.\n"); |
| } |
| return EXIT_SUCCESS; |
| } |
| /*@end group*/ |