1 | /* Pipe to a Subprocess |
2 | Copyright (C) 1991-2024 Free Software Foundation, Inc. |
3 | |
4 | This program is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU General Public License |
6 | as published by the Free Software Foundation; either version 2 |
7 | of the License, or (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 <https://www.gnu.org/licenses/>. |
16 | */ |
17 | |
18 | #include <stdio.h> |
19 | #include <stdlib.h> |
20 | |
21 | void |
22 | write_data (FILE * stream) |
23 | { |
24 | int i; |
25 | for (i = 0; i < 100; i++) |
26 | fprintf (stream, "%d\n" , i); |
27 | if (ferror (stream: stream)) |
28 | { |
29 | fprintf (stderr, "Output to stream failed.\n" ); |
30 | exit (EXIT_FAILURE); |
31 | } |
32 | } |
33 | |
34 | /*@group*/ |
35 | int |
36 | main (void) |
37 | { |
38 | FILE *output; |
39 | |
40 | output = popen (command: "more" , modes: "w" ); |
41 | if (!output) |
42 | { |
43 | fprintf (stderr, |
44 | "incorrect parameters or too many files.\n" ); |
45 | return EXIT_FAILURE; |
46 | } |
47 | write_data (stream: output); |
48 | if (pclose (stream: output) != 0) |
49 | { |
50 | fprintf (stderr, |
51 | "Could not run more or other error.\n" ); |
52 | } |
53 | return EXIT_SUCCESS; |
54 | } |
55 | /*@end group*/ |
56 | |