popen: fix cygwin 1.5 bug when stdin closed

[gnulib.git] / tests / test-popen.c

diff --git a/tests/test-popen.c b/tests/test-popen.c
new file mode 100644 (file)
index 0000000..3d689e9
--- /dev/null
+++ b/tests/test-popen.c
@@ -0,0 +1,106 @@
+/* Test of opening a subcommand stream.
+   Copyright (C) 2009 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 3 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, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Eric Blake <ebb9@byu.net>, 2009.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <stdio.h>
+
+/* Helpers.  */
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#define ASSERT(expr) \
+  do                                                                        \
+    {                                                                       \
+      if (!(expr))                                                          \
+        {                                                                   \
+          fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+          fflush (stderr);                                                  \
+          abort ();                                                         \
+        }                                                                   \
+    }                                                                       \
+  while (0)
+
+int
+main (int argc, char **argv)
+{
+  size_t len;
+  char *cmd;
+  int i;
+
+  /* Children - use the pipe.  */
+  if (argc > 1)
+    {
+      if (*argv[1] == 'r') /* Parent is reading, so we write.  */
+       ASSERT (putchar ('c') == 'c');
+      else /* Parent is writing, so we read.  */
+       ASSERT (getchar () == 'p');
+      /* Test that parent can read non-zero status.  */
+      return 42;
+    }
+
+  /* Parent - create read and write child, once under normal
+     circumstances and once with stdin and stdout closed.  */
+  len = strlen (argv[0]);
+  cmd = malloc (len + 3); /* Adding " r" and NUL.  */
+  ASSERT (cmd);
+  /* We count on argv[0] not containing any shell metacharacters.  */
+  strcpy (cmd, argv[0]);
+  cmd[len] = ' ';
+  cmd[len + 2] = '\0';
+  for (i = 0; i < 2; i++)
+    {
+      FILE *child;
+      int status;
+
+      if (i)
+       {
+         ASSERT (fclose (stdin) == 0);
+         ASSERT (fclose (stdout) == 0);
+       }
+
+      cmd[len + 1] = 'r';
+      ASSERT (child = popen (cmd, "r"));
+      ASSERT (fgetc (child) == 'c');
+      status = pclose (child);
+      ASSERT (WIFEXITED (status));
+      ASSERT (WEXITSTATUS (status) == 42);
+      if (i)
+       {
+         ASSERT (dup2 (STDIN_FILENO, STDIN_FILENO) == -1);
+         ASSERT (dup2 (STDOUT_FILENO, STDOUT_FILENO) == -1);
+       }
+
+      cmd[len + 1] = 'w';
+      ASSERT (child = popen (cmd, "w"));
+      ASSERT (fputc ('p', child) == 'p');
+      status = pclose (child);
+      ASSERT (WIFEXITED (status));
+      ASSERT (WEXITSTATUS (status) == 42);
+      if (i)
+       {
+         ASSERT (dup2 (STDIN_FILENO, STDIN_FILENO) == -1);
+         ASSERT (dup2 (STDOUT_FILENO, STDOUT_FILENO) == -1);
+       }
+    }
+  free (cmd);
+  return 0;
+}