maint: update copyright

[gnulib.git] / lib / isapipe.c

diff --git a/lib/isapipe.c b/lib/isapipe.c
index fe885bf..b59e235 100644 (file)
--- a/lib/isapipe.c
+++ b/lib/isapipe.c
@@ -1,11 +1,11 @@
 /* Test whether a file descriptor is a pipe.
 
-   Copyright (C) 2006 Free Software Foundation, Inc.
+   Copyright (C) 2006, 2008-2014 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   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 2, or (at your option)
-   any later version.
+   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
@@ -13,8 +13,7 @@
    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.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Written by Paul Eggert.  */
 
@@ -23,22 +22,42 @@
 #include "isapipe.h"
 
 #include <errno.h>
-#include <stdbool.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
 
-#include "stat-macros.h"
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+/* Windows platforms.  */
 
-/* Whether pipes are FIFOs; -1 if not known.  */
-#ifndef HAVE_FIFO_PIPES
-# define HAVE_FIFO_PIPES (-1)
-#endif
+/* Get GetFileType.  */
+# include <windows.h>
+
+/* Get _get_osfhandle.  */
+# include "msvc-nothrow.h"
+
+int
+isapipe (int fd)
+{
+  HANDLE h = (HANDLE) _get_osfhandle (fd);
+
+  if (h == INVALID_HANDLE_VALUE)
+    {
+      errno = EBADF;
+      return -1;
+    }
+
+  return (GetFileType (h) == FILE_TYPE_PIPE);
+}
+
+#else
+/* Unix platforms.  */
+
+# include <stdbool.h>
+# include <sys/types.h>
+# include <sys/stat.h>
+# include <unistd.h>
 
 /* The maximum link count for pipes; (nlink_t) -1 if not known.  */
-#ifndef PIPE_LINK_COUNT_MAX
-# define PIPE_LINK_COUNT_MAX ((nlink_t) (-1))
-#endif
+# ifndef PIPE_LINK_COUNT_MAX
+#  define PIPE_LINK_COUNT_MAX ((nlink_t) (-1))
+# endif
 
 /* Return 1 if FD is a pipe, 0 if not, -1 (setting errno) on error.
 
@@ -68,31 +87,33 @@ isapipe (int fd)
      On Darwin 7.7, pipes are sockets, so check for those instead.  */
 
   if (! ((HAVE_FIFO_PIPES == 0 || HAVE_FIFO_PIPES == 1)
-        && PIPE_LINK_COUNT_MAX != (nlink_t) -1)
+         && PIPE_LINK_COUNT_MAX != (nlink_t) -1)
       && (S_ISFIFO (st.st_mode) | S_ISSOCK (st.st_mode)))
     {
       int fd_pair[2];
       int pipe_result = pipe (fd_pair);
       if (pipe_result != 0)
-       return pipe_result;
+        return pipe_result;
       else
-       {
-         struct stat pipe_st;
-         int fstat_pipe_result = fstat (fd_pair[0], &pipe_st);
-         int fstat_pipe_errno = errno;
-         close (fd_pair[0]);
-         close (fd_pair[1]);
-         if (fstat_pipe_result != 0)
-           {
-             errno = fstat_pipe_errno;
-             return fstat_pipe_result;
-           }
-         check_for_fifo = (S_ISFIFO (pipe_st.st_mode) != 0);
-         pipe_link_count_max = pipe_st.st_nlink;
-       }
+        {
+          struct stat pipe_st;
+          int fstat_pipe_result = fstat (fd_pair[0], &pipe_st);
+          int fstat_pipe_errno = errno;
+          close (fd_pair[0]);
+          close (fd_pair[1]);
+          if (fstat_pipe_result != 0)
+            {
+              errno = fstat_pipe_errno;
+              return fstat_pipe_result;
+            }
+          check_for_fifo = (S_ISFIFO (pipe_st.st_mode) != 0);
+          pipe_link_count_max = pipe_st.st_nlink;
+        }
     }
 
   return
     (st.st_nlink <= pipe_link_count_max
      && (check_for_fifo ? S_ISFIFO (st.st_mode) : S_ISSOCK (st.st_mode)));
 }
+
+#endif