From b41152d716ee9c5ba34495a54e64ea2b732139b5 Mon Sep 17 00:00:00 2001
From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Fri, 11 Nov 2016 15:00:03 -0200
Subject: Consolidate Linux open implementation

This patch consolidates the open Linux syscall implementation on
sysdeps/unix/sysv/linux/open{64}.c.  The changes are:

  1. Remove open{64} from auto-generation syscalls.list.
  2. Add a new open{64}.c implementation.  For architectures that
     define __OFF_T_MATCHES_OFF64_T the default open64 will create
     alias to required open symbols.
  3. Use __NR_openat as default syscall for open{64}.

Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32,
arch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu.

	* sysdeps/unix/sysv/linux/generic/open.c: Remove file.
	* sysdeps/unix/sysv/linux/generic/open64.c: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/open64.c: Likewise.
	* sysdeps/unix/sysv/linux/open.c: New file.
	* sysdeps/unix/sysv/linux/open64.c (__libc_open64): Use O_LARGEFILE
	only for __OFF_T_MATCHES_OFF64_T and add alias to open if the case.
	* sysdeps/unix/sysv/linux/wordsize-64/syscalls.list: Remove open
	from auto-generated list.
---
 sysdeps/unix/sysv/linux/open64.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

(limited to 'sysdeps/unix/sysv/linux/open64.c')

diff --git a/sysdeps/unix/sysv/linux/open64.c b/sysdeps/unix/sysv/linux/open64.c
index 5e209ee..fcac984 100644
--- a/sysdeps/unix/sysv/linux/open64.c
+++ b/sysdeps/unix/sysv/linux/open64.c
@@ -15,10 +15,11 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
 #include <fcntl.h>
 #include <stdarg.h>
-#include <stdio.h>
+
 #include <sysdep-cancel.h>
 
 /* Open FILE with access OFLAG.  If O_CREAT or O_TMPFILE is in OFLAG,
@@ -36,8 +37,23 @@ __libc_open64 (const char *file, int oflag, ...)
       va_end (arg);
     }
 
-  return SYSCALL_CANCEL (open, file, oflag | O_LARGEFILE, mode);
+#ifdef __OFF_T_MATCHES_OFF64_T
+# define EXTRA_OPEN_FLAGS 0
+#else
+# define EXTRA_OPEN_FLAGS O_LARGEFILE
+#endif
+
+  return SYSCALL_CANCEL (openat, AT_FDCWD, file, oflag | EXTRA_OPEN_FLAGS,
+			 mode);
 }
-weak_alias (__libc_open64, __open64)
+
+strong_alias (__libc_open64, __open64)
 libc_hidden_weak (__open64)
 weak_alias (__libc_open64, open64)
+
+#ifdef __OFF_T_MATCHES_OFF64_T
+strong_alias (__libc_open64, __libc_open)
+strong_alias (__libc_open64, __open)
+libc_hidden_weak (__open)
+weak_alias (__libc_open64, open)
+#endif
-- 
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