fdopendir: optimize on mingw

[gnulib.git] / lib / unistd.in.h

diff --git a/lib/unistd.in.h b/lib/unistd.in.h
index 7dc33bc..fe645b7 100644 (file)
--- a/lib/unistd.in.h
+++ b/lib/unistd.in.h
@@ -178,6 +178,28 @@ extern int dup2 (int oldfd, int newfd);
 #endif
 
 
+#if @GNULIB_DUP3@
+/* Copy the file descriptor OLDFD into file descriptor NEWFD, with the
+   specified flags.
+   The flags are a bitmask, possibly including O_CLOEXEC (defined in <fcntl.h>)
+   and O_TEXT, O_BINARY (defined in "binary-io.h").
+   Close NEWFD first if it is open.
+   Return newfd if successful, otherwise -1 and errno set.
+   See the Linux man page at
+   <http://www.kernel.org/doc/man-pages/online/pages/man2/dup3.2.html>.  */
+# if @HAVE_DUP3@
+#  define dup3 rpl_dup3
+# endif
+extern int dup3 (int oldfd, int newfd, int flags);
+#elif defined GNULIB_POSIXCHECK
+# undef dup3
+# define dup3(o,n,f) \
+    (GL_LINK_WARNING ("dup3 is unportable - " \
+                      "use gnulib module dup3 for portability"), \
+     dup3 (o, n, f))
+#endif
+
+
 #if @GNULIB_ENVIRON@
 # if !@HAVE_DECL_ENVIRON@
 /* Set of environment variables and values.  An array of strings of the form
@@ -226,11 +248,11 @@ extern int fchdir (int /*fd*/);
 #  define dup rpl_dup
 extern int dup (int);
 
-#  if @REPLACE_DUP2@
-#   undef dup2
-#  endif
-#  define dup2 rpl_dup2_fchdir
-extern int dup2 (int, int);
+/* Gnulib internal hooks needed to maintain the fchdir metadata.  */
+extern int _gl_register_fd (int fd, const char *filename);
+extern void _gl_unregister_fd (int fd);
+extern int _gl_register_dup (int oldfd, int newfd);
+extern const char *_gl_directory_name (int fd);
 
 # endif
 #elif defined GNULIB_POSIXCHECK
@@ -328,7 +350,8 @@ extern int getdomainname(char *name, size_t len);
 
 #if @GNULIB_GETDTABLESIZE@
 # if !@HAVE_GETDTABLESIZE@
-/* Return the maximum number of file descriptors in the current process.  */
+/* Return the maximum number of file descriptors in the current process.
+   In POSIX, this is same as sysconf (_SC_OPEN_MAX).  */
 extern int getdtablesize (void);
 # endif
 #elif defined GNULIB_POSIXCHECK
@@ -537,10 +560,13 @@ extern int link (const char *path1, const char *path2);
    The flags are a bitmask, possibly including O_CLOEXEC (defined in <fcntl.h>)
    and O_TEXT, O_BINARY (defined in "binary-io.h").
    Store the read-end as fd[0] and the write-end as fd[1].
-   Return 0 upon success, or -1 with errno set upon failure.  */
-# if !@HAVE_PIPE2@
-extern int pipe2 (int fd[2], int flags);
+   Return 0 upon success, or -1 with errno set upon failure.
+   See also the Linux man page at
+   <http://www.kernel.org/doc/man-pages/online/pages/man2/pipe2.2.html>.  */
+# if @HAVE_PIPE2@
+#  define pipe2 rpl_pipe2
 # endif
+extern int pipe2 (int fd[2], int flags);
 #elif defined GNULIB_POSIXCHECK
 # undef pipe2
 # define pipe2(f,o) \
@@ -595,12 +621,6 @@ extern ssize_t write (int fd, const void *buf, size_t count);
 #endif
 
 
-#ifdef FCHDIR_REPLACEMENT
-/* gnulib internal function.  */
-extern void _gl_unregister_fd (int fd);
-#endif
-
-
 #ifdef __cplusplus
 }
 #endif