From: Jakub Jelinek <jakub@redhat.com>
Date: Thu, 12 Jul 2007 14:56:42 +0000 (+0000)
Subject: 2007-02-21  Ulrich Drepper  <drepper@redhat.com>
X-Git-Tag: cvs/fedora-glibc-2_5-20070712T1701~56
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eb612ee5735515d15f29c27789dd85415d5f3e25;p=thirdparty%2Fglibc.git

2007-02-21  Ulrich Drepper  <drepper@redhat.com>

	[BZ #3458]
	* sysdeps/unix/sysv/linux/posix_madvise.c: New file.
	* sysdeps/unix/sysv/linux/syscalls.list: Remove posix_madvise entry.
---

diff --git a/ChangeLog b/ChangeLog
index f8332f6d769..7c6c4789089 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2007-02-21  Ulrich Drepper  <drepper@redhat.com>
+
+	[BZ #3458]
+	* sysdeps/unix/sysv/linux/posix_madvise.c: New file.
+	* sysdeps/unix/sysv/linux/syscalls.list: Remove posix_madvise entry.
+
 2007-02-17  Ulrich Drepper  <drepper@redhat.com>
 
 	[BZ #3842]
diff --git a/sysdeps/unix/sysv/linux/posix_madvise.c b/sysdeps/unix/sysv/linux/posix_madvise.c
new file mode 100644
index 00000000000..880b17ef313
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/posix_madvise.c
@@ -0,0 +1,38 @@
+/* Copyright (C) 2007 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 <sysdep.h>
+#include <sys/mman.h>
+
+
+int
+posix_madvise (void *addr, size_t len, int advice)
+{
+  /* We have one problem: the kernel's MADV_DONTNEED does not
+     correspond to POSIX's POSIX_MADV_DONTNEED.  The former simply
+     discards changes made to the memory without writing it back to
+     disk, if this would be necessary.  The POSIX behavior does not
+     allow this.  There is no functionality mapping the POSIX behavior
+     so far so we ignore that advice for now.  */
+  if (advice == POSIX_MADV_DONTNEED)
+    return 0;
+
+  INTERNAL_SYSCALL_DECL (err);
+  int result = INTERNAL_SYSCALL (madvise, err, 3, addr, len, advice);
+  return INTERNAL_SYSCALL_ERRNO (result, err);
+}
diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
index fca29b26ff8..8c19a30fcfe 100644
--- a/sysdeps/unix/sysv/linux/syscalls.list
+++ b/sysdeps/unix/sysv/linux/syscalls.list
@@ -31,7 +31,6 @@ ioperm		-	ioperm		i:iii	ioperm
 iopl		-	iopl		i:i	iopl
 klogctl		EXTRA	syslog		i:isi	klogctl
 lchown		-	lchown		i:sii	__lchown	lchown
-posix_madvise	-	madvise		Vi:pii	posix_madvise
 madvise		-	madvise		i:pii	madvise
 mincore		-	mincore		i:anV	mincore
 mlock		-	mlock		i:bn	mlock