1 /* Test of create_pipe_bidi/wait_subprocess.
2 Copyright (C) 2009, 2010 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, or (at your option)
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, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
21 #include "wait-process.h"
30 /* Depending on arguments, this test intentionally closes stderr or
31 starts life with stderr closed. So, we arrange to have fd 10
32 (outside the range of interesting fd's during the test) set up to
33 duplicate the original stderr. */
35 #define BACKUP_STDERR_FILENO 10
36 #define ASSERT_STREAM myerr
41 /* Code executed by the child process. argv[1] = "child". */
43 child_main (int argc, char *argv[])
45 char buffer[2] = { 's', 't' };
51 /* Read one byte from fd 0, and write its value plus one to fd 1.
52 fd 2 should be closed iff the argument is 1. Check that no other file
53 descriptors leaked. */
55 ASSERT (read (STDIN_FILENO, buffer, 2) == 1);
58 ASSERT (write (STDOUT_FILENO, buffer, 1) == 1);
61 ret = dup2 (STDERR_FILENO, STDERR_FILENO);
62 switch (atoi (argv[2]))
65 /* Expect fd 2 is open. */
66 ASSERT (ret == STDERR_FILENO);
69 /* Expect fd 2 is closed. */
71 ASSERT (errno == EBADF);
77 for (fd = 3; fd < 7; fd++)
80 ASSERT (close (fd) == -1);
81 ASSERT (errno == EBADF);
87 /* Create a bi-directional pipe to a test child, and validate that the
88 child program returns the expected output. The child is the same
89 program as the parent ARGV0, but with different arguments.
90 STDERR_CLOSED is true if we have already closed fd 2. */
92 test_pipe (const char *argv0, bool stderr_closed)
97 char buffer[2] = { 'a', 't' };
100 argv[0] = (char *) argv0;
101 argv[1] = (char *) "child";
102 argv[2] = (char *) (stderr_closed ? "1" : "0");
104 pid = create_pipe_bidi (argv0, argv0, argv, false, true, true, fd);
106 ASSERT (STDERR_FILENO < fd[0]);
107 ASSERT (STDERR_FILENO < fd[1]);
109 /* Push child's input. */
110 ASSERT (write (fd[1], buffer, 1) == 1);
111 ASSERT (close (fd[1]) == 0);
113 /* Get child's output. */
114 ASSERT (read (fd[0], buffer, 2) == 1);
116 /* Wait for child. */
117 ASSERT (wait_subprocess (pid, argv0, true, false, true, true, NULL) == 0);
118 ASSERT (close (fd[0]) == 0);
120 /* Check the result. */
121 ASSERT (buffer[0] == 'b');
122 ASSERT (buffer[1] == 't');
125 /* Code executed by the parent process. */
127 parent_main (int argc, char *argv[])
134 /* Selectively close various standard fds, to verify the child process is
135 not impacted by this. */
136 test = atoi (argv[1]);
171 /* Plug any file descriptor leaks inherited from outside world before
172 starting, so that child has a clean slate (at least for the fds that we
173 might be manipulating). */
174 for (fd = 3; fd < 7; fd++)
177 test_pipe (argv[0], test >= 4);
183 main (int argc, char *argv[])
187 fprintf (stderr, "%s: need arguments\n", argv[0]);
190 if (strcmp (argv[1], "child") == 0)
192 /* fd 2 might be closed, but fd BACKUP_STDERR_FILENO is the original
194 myerr = fdopen (BACKUP_STDERR_FILENO, "w");
197 return child_main (argc, argv);
199 /* We might close fd 2 later, so save it in fd 10. */
200 if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
201 || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
203 return parent_main (argc, argv);