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 #if GNULIB_POPEN_SAFER
34 #define ASSERT(expr) \
39 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
47 main (int argc, char **argv)
53 /* Children - use the pipe. */
56 if (*argv[1] == 'r') /* Parent is reading, so we write. */
57 ASSERT (putchar ('c') == 'c');
58 else /* Parent is writing, so we read. */
59 ASSERT (getchar () == 'p');
60 /* Test that parent can read non-zero status. */
64 /* Parent - create read and write child, once under normal
65 circumstances and once with stdin and stdout closed. */
66 len = strlen (argv[0]);
67 cmd = malloc (len + 3); /* Adding " r" and NUL. */
69 /* We count on argv[0] not containing any shell metacharacters. */
70 strcpy (cmd, argv[0]);
73 for (i = 0; i < 2; i++)
80 ASSERT (fclose (stdin) == 0);
81 ASSERT (fclose (stdout) == 0);
85 ASSERT (child = popen (cmd, "r"));
86 ASSERT (fgetc (child) == 'c');
87 status = pclose (child);
88 ASSERT (WIFEXITED (status));
89 ASSERT (WEXITSTATUS (status) == 42);
92 ASSERT (dup2 (STDIN_FILENO, STDIN_FILENO) == -1);
93 ASSERT (dup2 (STDOUT_FILENO, STDOUT_FILENO) == -1);
97 ASSERT (child = popen (cmd, "w"));
98 ASSERT (fputc ('p', child) == 'p');
99 status = pclose (child);
100 ASSERT (WIFEXITED (status));
101 ASSERT (WEXITSTATUS (status) == 42);
104 ASSERT (dup2 (STDIN_FILENO, STDIN_FILENO) == -1);
105 ASSERT (dup2 (STDOUT_FILENO, STDOUT_FILENO) == -1);