mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 04:31:03 +00:00
e442e40de5
With internal fcntl64 internal (commit 06ab719d), it is possible to
consolidate lockf implementation by using the LFS fcntl interface
instead of using arch and system-specific implementations.
For Linux, the i386 implementation is used as generic implementation
by replacing the direct syscall with fcntl64 call. The LFS symbol
alias for default LFS ABI (__OFF_T_MATCHES_OFF64_T) is used to avoid
the duplicate symbol (instead of overriding the implementation with an
empty file).
For Hurd lockf64 semantic is changed: previous generic lockf64
implementation returned EOVERFLOW if LEN input is larger than 32-bit
off_t. However, Hurd fcntl64 implementation for F_GETLK64, F_SETLK64,
and F_SETLKW64 do accept off64_t inputs (__f_setlk accepts only off64_t
inputs).
Checked on i686-linux-gnu and x86_64-linux-gnu along with a i686-gnu
build.
* io/Makefile (tests): Add tst-lockf.
* io/lockf.c (lockf): Use __fcntl and only define for
!__OFF_T_MATCHES_OFF64_T.
* io/lockf64.c (__lockf64): Call __fcntl64 and alias to lockf for
__OFF_T_MATCHES_OFF64_T case.
* io/tst-lockf.c: New file.
* sysdeps/unix/sysv/linux/i386/lockf64.c: Remove file.
* sysdeps/unix/sysv/linux/arm/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/m68k/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/n32/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/sh/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/lockf64.c: Likewise.
63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/* Copyright (C) 1994-2019 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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
|
|
/* lockf is a simplified interface to fcntl's locking facilities. */
|
|
int
|
|
__lockf64 (int fd, int cmd, off64_t len64)
|
|
{
|
|
/* lockf is always relative to the current file position. */
|
|
struct flock64 fl64 = {
|
|
.l_type = F_WRLCK,
|
|
.l_whence = SEEK_CUR,
|
|
.l_len = len64,
|
|
};
|
|
|
|
/* lockf() is a cancellation point but so is fcntl() if F_SETLKW is
|
|
used. Therefore we don't have to care about cancellation here,
|
|
the fcntl() function will take care of it. */
|
|
switch (cmd)
|
|
{
|
|
case F_TEST:
|
|
/* Test the lock: return 0 if FD is unlocked or locked by this process;
|
|
return -1, set errno to EACCES, if another process holds the lock. */
|
|
fl64.l_type = F_RDLCK;
|
|
if (__fcntl (fd, F_GETLK64, &fl64) < 0)
|
|
return -1;
|
|
if (fl64.l_type == F_UNLCK || fl64.l_pid == __getpid ())
|
|
return 0;
|
|
__set_errno (EACCES);
|
|
return -1;
|
|
case F_ULOCK:
|
|
fl64.l_type = F_UNLCK;
|
|
return __fcntl64 (fd, F_SETLK64, &fl64);
|
|
case F_LOCK:
|
|
return __fcntl64 (fd, F_SETLKW64, &fl64);
|
|
case F_TLOCK:
|
|
return __fcntl64 (fd, F_SETLK64, &fl64);
|
|
}
|
|
__set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
weak_alias (__lockf64, lockf64)
|
|
#ifdef __OFF_T_MATCHES_OFF64_T
|
|
weak_alias (lockf64, lockf)
|
|
#endif
|