#ifndef _GL_UNISTD_H
#define _GL_UNISTD_H
+/* NetBSD 5.0 mis-defines NULL. Also get size_t. */
+#include <stddef.h>
+
/* mingw doesn't define the SEEK_* or *_FILENO macros in <unistd.h>. */
#if !(defined SEEK_CUR && defined SEEK_END && defined SEEK_SET)
# include <stdio.h>
# include <sys/types.h>
#endif
+/* Get getopt(), optarg, optind, opterr, optopt. */
+#if @GNULIB_UNISTD_H_GETOPT@
+# include <getopt.h>
+#endif
+
#if @GNULIB_GETHOSTNAME@
/* Get all possible declarations of gethostname(). */
# if @UNISTD_H_HAVE_WINSOCK2_H@
# define close rpl_close
extern int close (int);
# endif
-#elif @UNISTD_H_HAVE_WINSOCK2_H@
+#elif @UNISTD_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS@
# undef close
# define close close_used_without_requesting_gnulib_module_close
#elif defined GNULIB_POSIXCHECK
#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
See <http://www.opengroup.org/susv3xsh/getlogin.html>.
*/
# if !@HAVE_DECL_GETLOGIN_R@
-# include <stddef.h>
extern int getlogin_r (char *name, size_t size);
# endif
#elif defined GNULIB_POSIXCHECK
#endif
+#if @GNULIB_PIPE2@
+/* Create a pipe, applying the given flags when opening the read-end of the
+ pipe and the write-end of the pipe.
+ 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.
+ See also the Linux man page at
+ <http://www.kernel.org/doc/man-pages/online/pages/man2/pipe2.2.html>. */
+# if !@HAVE_PIPE2@
+extern int pipe2 (int fd[2], int flags);
+# endif
+#elif defined GNULIB_POSIXCHECK
+# undef pipe2
+# define pipe2(f,o) \
+ (GL_LINK_WARNING ("pipe2 is unportable - " \
+ "use gnulib module pipe2 for portability"), \
+ pipe2 (f, o))
+#endif
+
+
#if @GNULIB_READLINK@
/* Read the contents of the symbolic link FILE and place the first BUFSIZE
bytes of it into BUF. Return the number of bytes placed into BUF if
See the POSIX:2001 specification
<http://www.opengroup.org/susv3xsh/readlink.html>. */
# if !@HAVE_READLINK@
-# include <stddef.h>
extern int readlink (const char *file, char *buf, size_t bufsize);
# endif
#elif defined GNULIB_POSIXCHECK