Remove PIPE_BUF Linux-specific code

Fixes BZ #12723

The variable pipe buffer size does nothing to the value of PIPE_BUF,
since the number of bytes that are atomically written is still
PIPE_BUF on Linux.

2 files changed, 178 insertions, 1 deletions

diff --git a/posix/Makefile b/posix/Makefile
index 2cacd219b5..658c47e705 100644
--- a/posix/Makefile
+++ b/posix/Makefile
@@ -86,7 +86,8 @@ tests		:= tstgetopt testfnm runtests runptests	     \
 		   tst-rfc3484-3 \
 		   tst-getaddrinfo3 tst-fnmatch2 tst-cpucount tst-cpuset \
 		   bug-getopt1 bug-getopt2 bug-getopt3 bug-getopt4 \
-		   bug-getopt5 tst-getopt_long1 bug-regex34 bug-regex35
+		   bug-getopt5 tst-getopt_long1 bug-regex34 bug-regex35 \
+		   tst-pathconf
 xtests		:= bug-ga2
 ifeq (yes,$(build-shared))
 test-srcs	:= globtest
diff --git a/posix/tst-pathconf.c b/posix/tst-pathconf.c
new file mode 100644
index 0000000000..7627a24d8d
--- /dev/null
+++ b/posix/tst-pathconf.c
@@ -0,0 +1,176 @@
+/* Test that values of pathconf and fpathconf are consistent for a file.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+static void prepare (void);
+#define PREPARE(argc, argv) prepare ()
+
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+
+#include "../test-skeleton.c"
+
+static int dir_fd;
+static char *dirbuf;
+
+static void
+prepare (void)
+{
+  size_t test_dir_len = strlen (test_dir);
+  static const char dir_name[] = "/tst-pathconf.XXXXXX";
+
+  size_t dirbuflen = test_dir_len + sizeof (dir_name);
+  dirbuf = malloc (dirbuflen);
+  if (dirbuf == NULL)
+    {
+      puts ("Out of memory");
+      exit (1);
+    }
+
+  snprintf (dirbuf, dirbuflen, "%s%s", test_dir, dir_name);
+  if (mkdtemp (dirbuf) == NULL)
+    {
+      printf ("Cannot create temporary directory: %s\n", strerror (errno));
+      exit (1);
+    }
+
+  add_temp_file (dirbuf);
+
+  dir_fd = open (dirbuf, O_RDONLY);
+  if (dir_fd == -1)
+    {
+      printf ("Cannot open directory: %s\n", strerror (errno));
+      exit (1);
+    }
+}
+
+
+static int
+do_test (void)
+{
+  int ret = 0;
+  static const char *fifo_name = "some-fifo";
+
+  size_t filenamelen = strlen (dirbuf) + strlen (fifo_name) + 2;
+  char *filename = malloc (filenamelen);
+
+  snprintf (filename, filenamelen, "%s/%s", dirbuf, fifo_name);
+
+  /* Create a fifo in the directory.  */
+  int e = mkfifo (filename, 0777);
+  if (e == -1)
+    {
+      printf ("fifo creation failed (%s)\n", strerror (errno));
+      ret = 1;
+      goto out_nofifo;
+    }
+
+  long dir_pathconf = pathconf (dirbuf, _PC_PIPE_BUF);
+
+  if (dir_pathconf < 0)
+    {
+      printf ("pathconf on directory failed: %s\n", strerror (errno));
+      ret = 1;
+      goto out_nofifo;
+    }
+
+  long fifo_pathconf = pathconf (filename, _PC_PIPE_BUF);
+
+  if (fifo_pathconf < 0)
+    {
+      printf ("pathconf on file failed: %s\n", strerror (errno));
+      ret = 1;
+      goto out_nofifo;
+    }
+
+  int fifo = open (filename, O_RDONLY | O_NONBLOCK);
+
+  if (fifo < 0)
+    {
+      printf ("fifo open failed (%s)\n", strerror (errno));
+      ret = 1;
+      goto out_nofifo;
+    }
+
+  long dir_fpathconf = fpathconf (dir_fd, _PC_PIPE_BUF);
+
+  if (dir_fpathconf < 0)
+    {
+      printf ("fpathconf on directory failed: %s\n", strerror (errno));
+      ret = 1;
+      goto out;
+    }
+
+  long fifo_fpathconf = fpathconf (fifo, _PC_PIPE_BUF);
+
+  if (fifo_fpathconf < 0)
+    {
+      printf ("fpathconf on file failed: %s\n", strerror (errno));
+      ret = 1;
+      goto out;
+    }
+
+  if (fifo_pathconf != fifo_fpathconf)
+    {
+      printf ("fifo pathconf (%ld) != fifo fpathconf (%ld)\n", fifo_pathconf,
+	      fifo_fpathconf);
+      ret = 1;
+      goto out;
+    }
+
+  if (dir_pathconf != fifo_pathconf)
+    {
+      printf ("directory pathconf (%ld) != fifo pathconf (%ld)\n",
+	      dir_pathconf, fifo_pathconf);
+      ret = 1;
+      goto out;
+    }
+
+  if (dir_fpathconf != fifo_fpathconf)
+    {
+      printf ("directory fpathconf (%ld) != fifo fpathconf (%ld)\n",
+	      dir_fpathconf, fifo_fpathconf);
+      ret = 1;
+      goto out;
+    }
+
+out:
+  close (fifo);
+out_nofifo:
+  close (dir_fd);
+
+  if (unlink (filename) != 0)
+    {
+      printf ("Could not remove fifo (%s)\n", strerror (errno));
+      ret = 1;
+    }
+
+  if (rmdir (dirbuf) != 0)
+    {
+      printf ("Could not remove directory (%s)\n", strerror (errno));
+      ret = 1;
+    }
+
+  return ret;
+}