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 f8332f6d7694da1d2519d0b293bfa871891b323e..7c6c4789089bc028c0471d816ea8277439ad0102 100644 (file)
--- 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 (file)
index 0000000..880b17e
--- /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 fca29b26ff86bd7e337945c14ea1689155fce478..8c19a30fcfe5c66b442d4a1a6d9221ca595a0abc 100644 (file)
--- 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