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Consolidate Linux open implementation

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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.
This commit is contained in:
Adhemerval Zanella
2016-11-11 15:00:03 -02:00
parent 0f01acb340
commit b41152d716
6 changed files with 36 additions and 68 deletions
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51
sysdeps/unix/sysv/linux/open.c Normal file
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/* Copyright (C) 2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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, see
<http://www.gnu.org/licenses/>. */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdarg.h>
#include <sysdep-cancel.h>
#ifndef __OFF_T_MATCHES_OFF64_T
/* Open FILE with access OFLAG. If O_CREAT or O_TMPFILE is in OFLAG,
a third argument is the file protection. */
int
__libc_open (const char *file, int oflag, ...)
{
int mode = 0;
if (__OPEN_NEEDS_MODE (oflag))
{
va_list arg;
va_start (arg, oflag);
mode = va_arg (arg, int);
va_end (arg);
}
return SYSCALL_CANCEL (openat, AT_FDCWD, file, oflag, mode);
}
libc_hidden_def (__libc_open)
weak_alias (__libc_open, __open)
libc_hidden_weak (__open)
weak_alias (__libc_open, open)
#endif