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2009-07-25 Aurelien Jarno <aurelien@aurel32.net>
* sysdeps/unix/sysv/linux/kernel-features.h: define
__ASSUME_FDATASYNC.
* sysdeps/unix/sysv/linux/fdatasync.c: New file.
* sysdeps/unix/sysv/linux/Makefile: compile fdatasync.c with
-fexceptions.
* sysdeps/unix/sysv/linux/syscalls.list: Remove fdatasync.
sysdeps/unix/sysv/linux/Makefile | 1
sysdeps/unix/sysv/linux/fdatasync.c | 69 ++++++++++++++++++++++++++++++
sysdeps/unix/sysv/linux/kernel-features.h | 6 ++
sysdeps/unix/sysv/linux/syscalls.list | 1
4 files changed, 76 insertions(+), 1 deletion(-)
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -20,6 +20,7 @@
setfsuid setfsgid makedev epoll_pwait signalfd \
eventfd eventfd_read eventfd_write prlimit
+CFLAGS-fdatasync.c = -fexceptions
CFLAGS-gethostid.c = -fexceptions
sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/fdatasync.c
@@ -0,0 +1,69 @@
+/* fdatasync -- synchronize at least the data part of a file with
+ the underlying media. Linux version.
+
+ 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 <errno.h>
+#include <unistd.h>
+
+#include <sysdep-cancel.h>
+#include <sys/syscall.h>
+#include <bp-checks.h>
+
+#include <kernel-features.h>
+
+#if defined __NR_fdatasync && !defined __ASSUME_FDATASYNC
+static int __have_no_fdatasync;
+#endif
+
+static int
+do_fdatasync (int fd)
+{
+#ifdef __ASSUME_FDATASYNC
+ return INLINE_SYSCALL (fdatasync, 1, fd);
+#elif defined __NR_fdatasync
+ if (!__builtin_expect (__have_no_fdatasync, 0))
+ {
+ int result = INLINE_SYSCALL (fdatasync, 1, fd);
+ if (__builtin_expect (result, 0) != -1 || errno != ENOSYS)
+ return result;
+
+ __have_no_fdatasync = 1;
+ }
+#endif
+ return INLINE_SYSCALL (fsync, 1, fd);
+}
+
+int
+__fdatasync (int fd)
+{
+ if (SINGLE_THREAD_P)
+ return do_fdatasync (fd);
+
+ int oldtype = LIBC_CANCEL_ASYNC ();
+
+ int result = do_fdatasync (fd);
+
+ LIBC_CANCEL_RESET (oldtype);
+
+ return result;
+}
+
+weak_alias (__fdatasync, fdatasync)
+
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -459,6 +459,12 @@
# define __ASSUME_FUTEX_LOCK_PI 1
#endif
+/* Support for fsyncdata syscall was added in 2.6.22 on alpha, but it
+ was already present in 2.0 kernels on other architectures. */
+#if (!defined __alpha || __LINUX_KERNEL_VERSION >= 0x020616)
+# define __ASSUME_FDATASYNC 1
+#endif
+
/* Support for utimensat syscall was added in 2.6.22, on SH
only after 2.6.22-rc1. */
#if __LINUX_KERNEL_VERSION >= 0x020616 \
--- a/sysdeps/unix/sysv/linux/syscalls.list
+++ b/sysdeps/unix/sysv/linux/syscalls.list
@@ -11,7 +11,6 @@
epoll_create1 EXTRA epoll_create1 i:i epoll_create1
epoll_ctl EXTRA epoll_ctl i:iiip epoll_ctl
epoll_wait EXTRA epoll_wait Ci:ipii epoll_wait
-fdatasync - fdatasync Ci:i fdatasync
flock - flock i:ii __flock flock
fork - fork i: __libc_fork __fork fork
get_kernel_syms EXTRA get_kernel_syms i:p get_kernel_syms
|