1 /* Test of opening a subcommand stream.
2 Copyright (C) 2009 Free Software Foundation, Inc.
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.
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.
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/>. */
17 /* Written by Eric Blake <ebb9@byu.net>, 2009. */
30 #define ASSERT(expr) \
35 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
43 main (int argc, char **argv)
49 /* Children - use the pipe. */
52 if (*argv[1] == 'r') /* Parent is reading, so we write. */
53 ASSERT (putchar ('c') == 'c');
54 else /* Parent is writing, so we read. */
55 ASSERT (getchar () == 'p');
56 /* Test that parent can read non-zero status. */
60 /* Parent - create read and write child, once under normal
61 circumstances and once with stdin and stdout closed. */
62 len = strlen (argv[0]);
63 cmd = malloc (len + 3); /* Adding " r" and NUL. */
65 /* We count on argv[0] not containing any shell metacharacters. */
66 strcpy (cmd, argv[0]);
69 for (i = 0; i < 2; i++)
76 ASSERT (fclose (stdin) == 0);
77 ASSERT (fclose (stdout) == 0);
81 ASSERT (child = popen (cmd, "r"));
82 ASSERT (fgetc (child) == 'c');
83 status = pclose (child);
84 ASSERT (WIFEXITED (status));
85 ASSERT (WEXITSTATUS (status) == 42);
88 ASSERT (dup2 (STDIN_FILENO, STDIN_FILENO) == -1);
89 ASSERT (dup2 (STDOUT_FILENO, STDOUT_FILENO) == -1);
93 ASSERT (child = popen (cmd, "w"));
94 ASSERT (fputc ('p', child) == 'p');
95 status = pclose (child);
96 ASSERT (WIFEXITED (status));
97 ASSERT (WEXITSTATUS (status) == 42);
100 ASSERT (dup2 (STDIN_FILENO, STDIN_FILENO) == -1);
101 ASSERT (dup2 (STDOUT_FILENO, STDOUT_FILENO) == -1);