* misc/Makefile (routines): Add preadv, preadv64, pwritev, pwritev64.

* misc/Versions: Export preadv, preadv64, pwritev, pwritev64 for
	GLIBC_2.10.
	* misc/sys/uio.h: Declare preadv, preadv64, pwritev, pwritev64.
	* sysdeps/unix/sysv/linux/kernel-features.h: Add entries for preadv
	and pwritev.
	* misc/preadv.c: New file.
	* misc/preadv64.c: New file.
	* misc/pwritev.c: New file.
	* misc/pwritev64.c: New file.
	* sysdeps/posx/preadv.c: New file.
	* sysdeps/posx/preadv64.c: New file.
	* sysdeps/posx/pwritev.c: New file.
	* sysdeps/posx/pwritev64.c: New file.
	* sysdeps/unix/sysv/linux/preadv.c: New file.
	* sysdeps/unix/sysv/linux/preadv64.c: New file.
	* sysdeps/unix/sysv/linux/pwritev.c: New file.
	* sysdeps/unix/sysv/linux/pwritev64.c: New file.
	* sysdeps/unix/sysv/linux/wordsize-64/preadv64.c: New file.
	* sysdeps/unix/sysv/linux/wordsize-64/pwritev64.c: New file.

sysdeps/unix/sysv/linux/kernel-features.h

@@ -529,3 +529,10 @@
 #if __LINUX_KERNEL_VERSION >= 0x02061d
 # define __ASSUME_FUTEX_CLOCK_REALTIME	1
 #endif
+
+/* Support for preadv and pwritev was added in 2.6.30.  */
+#if __LINUX_KERNEL_VERSION >= 0x02061e \
+    && (defined __i386__ || defined __x86_64__)
+# define __ASSUME_PREADV	1
+# define __ASSUME_PWRITEV	1
+#endif

sysdeps/unix/sysv/linux/preadv.c

@@ -0,0 +1,88 @@
+/* Copyright (C) 2009 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include <stddef.h>
+#include <sys/param.h>
+#if __WORDSIZE == 64
+/* Hide the preadv64 declaration.  */
+# define preadv64 __redirect_preadv64
+#endif
+#include <sys/uio.h>
+
+#include <sysdep-cancel.h>
+#include <sys/syscall.h>
+#include <kernel-features.h>
+
+#ifndef PREADV
+# define PREADV preadv
+# define PREADV_REPLACEMENT __atomic_preadv_replacement
+# define PREAD __pread
+# define OFF_T off_t
+#endif
+
+static ssize_t PREADV_REPLACEMENT (int, __const struct iovec *,
+				   int, OFF_T) internal_function;
+
+
+ssize_t
+PREADV (fd, vector, count, offset)
+     int fd;
+     const struct iovec *vector;
+     int count;
+     OFF_T offset;
+{
+#ifdef __NR_preadv
+  ssize_t result;
+
+  if (SINGLE_THREAD_P)
+    result = INLINE_SYSCALL (preadv, 5, fd, vector, count, offset >> 32,
+			     offset & 0xffffffff);
+  else
+    {
+      int oldtype = LIBC_CANCEL_ASYNC ();
+
+      result = INLINE_SYSCALL (preadv, 5, fd, vector, count, offset >> 32,
+			       offset & 0xffffffff);
+
+      LIBC_CANCEL_RESET (oldtype);
+    }
+# ifdef __ASSUME_PREADV
+  return result;
+# endif
+#endif
+
+#ifndef __ASSUME_PREADV
+# ifdef __NR_preadv
+  if (result >= 0 || errno != ENOSYS)
+    return result;
+# endif
+
+  return PREADV_REPLACEMENT (fd, vector, count, offset);
+#endif
+}
+#if __WORDSIZE == 64
+# undef preadv64
+strong_alias (preadv, preadv64)
+#endif
+
+#ifndef __ASSUME_PREADV
+# undef PREADV
+# define PREADV static internal_function PREADV_REPLACEMENT
+# include <sysdeps/posix/preadv.c>
+#endif

sysdeps/unix/sysv/linux/preadv64.c

@@ -0,0 +1,6 @@
+#define PREADV preadv64
+#define PREADV_REPLACEMENT __atomic_preadv64_replacement
+#define PREAD __pread64
+#define OFF_T off64_t
+
+#include "preadv.c"

sysdeps/unix/sysv/linux/pwritev.c

@@ -0,0 +1,88 @@
+/* Copyright (C) 2009 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include <stddef.h>
+#include <sys/param.h>
+#if __WORDSIZE == 64 && !defined PWRITEV
+/* Hide the pwritev64 declaration.  */
+# define pwritev64 __redirect_pwritev64
+#endif
+#include <sys/uio.h>
+
+#include <sysdep-cancel.h>
+#include <sys/syscall.h>
+#include <kernel-features.h>
+
+#ifndef PWRITEV
+# define PWRITEV pwritev
+# define PWRITEV_REPLACEMENT __atomic_pwritev_replacement
+# define PWRITE __pwrite
+# define OFF_T off_t
+#endif
+
+static ssize_t PWRITEV_REPLACEMENT (int, __const struct iovec *,
+				    int, OFF_T) internal_function;
+
+
+ssize_t
+PWRITEV (fd, vector, count, offset)
+     int fd;
+     const struct iovec *vector;
+     int count;
+     OFF_T offset;
+{
+#ifdef __NR_pwritev
+  ssize_t result;
+
+  if (SINGLE_THREAD_P)
+    result = INLINE_SYSCALL (pwritev, 5, fd, vector, count, offset >> 32,
+			     offset & 0xffffffff);
+  else
+    {
+      int oldtype = LIBC_CANCEL_ASYNC ();
+
+      result = INLINE_SYSCALL (pwritev, 5, fd, vector, count, offset >> 32,
+			       offset & 0xffffffff);
+
+      LIBC_CANCEL_RESET (oldtype);
+    }
+# ifdef __ASSUME_PWRITEV
+  return result;
+# endif
+#endif
+
+#ifndef __ASSUME_PWRITEV
+# ifdef __NR_pwritev
+  if (result >= 0 || errno != ENOSYS)
+    return result;
+# endif
+
+  return PWRITEV_REPLACEMENT (fd, vector, count, offset);
+#endif
+}
+#if __WORDSIZE == 64 && defined pwritev64
+# undef pwritev64
+strong_alias (pwritev, pwritev64)
+#endif
+
+#ifndef __ASSUME_PWRITEV
+# undef PWRITEV
+# define PWRITEV static internal_function PWRITEV_REPLACEMENT
+# include <sysdeps/posix/pwritev.c>
+#endif

sysdeps/unix/sysv/linux/pwritev64.c

@@ -0,0 +1,6 @@
+#define PWRITEV pwritev64
+#define PWRITEV_REPLACEMENT __atomic_pwritev64_replacement
+#define PWRITE __pwrite64
+#define OFF_T off64_t
+
+#include "pwritev.c"

sysdeps/unix/sysv/linux/wordsize-64/preadv64.c

@@ -0,0 +1 @@
+/* Empty since the preadv syscall is equivalent.  */

sysdeps/unix/sysv/linux/wordsize-64/pwritev64.c

@@ -0,0 +1 @@
+/* Empty since the pwritev syscall is equivalent.  */