spawn-pipe tests: Like the child program only against libc.

[gnulib.git] / tests / test-spawn-pipe-child.c

diff --git a/tests/test-spawn-pipe-child.c b/tests/test-spawn-pipe-child.c
new file mode 100644 (file)
index 0000000..f1d3f0f
--- /dev/null
+++ b/tests/test-spawn-pipe-child.c
@@ -0,0 +1,113 @@
+/* Child program invoked by test-spawn-pipe..
+   Copyright (C) 2009-2011 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, 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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include <config.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+/* Get declarations of the Win32 API functions.  */
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
+#endif
+
+/* Depending on arguments, this test intentionally closes stderr or
+   starts life with stderr closed.  So, we arrange to have fd 10
+   (outside the range of interesting fd's during the test) set up to
+   duplicate the original stderr.  */
+
+#define BACKUP_STDERR_FILENO 10
+#define ASSERT_STREAM myerr
+#include "macros.h"
+
+static FILE *myerr;
+
+/* In this file, we use only system functions, no overrides from gnulib.  */
+#undef atoi
+#undef close
+#undef fcntl
+#undef fdopen
+#undef read
+#undef write
+
+/* Return non-zero if FD is open.  */
+static int
+is_open (int fd)
+{
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+  /* On Win32, the initial state of unassigned standard file
+     descriptors is that they are open but point to an
+     INVALID_HANDLE_VALUE, and there is no fcntl.  */
+  return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
+#else
+# ifndef F_GETFL
+#  error Please port fcntl to your platform
+# endif
+  return 0 <= fcntl (fd, F_GETFL);
+#endif
+}
+
+int
+main (int argc, char *argv[])
+{
+  char buffer[2] = { 's', 't' };
+  int fd;
+
+  /* fd 2 might be closed, but fd BACKUP_STDERR_FILENO is the original
+     stderr.  */
+  myerr = fdopen (BACKUP_STDERR_FILENO, "w");
+  if (!myerr)
+    return 2;
+
+  ASSERT (argc == 2);
+
+  /* Read one byte from fd 0, and write its value plus one to fd 1.
+     fd 2 should be closed iff the argument is 1.  Check that no other file
+     descriptors leaked.  */
+
+  ASSERT (read (STDIN_FILENO, buffer, 2) == 1);
+
+  buffer[0]++;
+  ASSERT (write (STDOUT_FILENO, buffer, 1) == 1);
+
+  switch (atoi (argv[1]))
+    {
+    case 0:
+      /* Expect fd 2 is open.  */
+      ASSERT (is_open (STDERR_FILENO));
+      break;
+    case 1:
+      /* Expect fd 2 is closed.  */
+      ASSERT (! is_open (STDERR_FILENO));
+      break;
+    default:
+      ASSERT (0);
+    }
+
+  for (fd = 3; fd < 7; fd++)
+    {
+      errno = 0;
+      ASSERT (close (fd) == -1);
+      ASSERT (errno == EBADF);
+    }
+
+  return 0;
+}