-/* Copyright (C) 1994-2014 Free Software Foundation, Inc.
+/* Copyright (C) 1994-2024 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
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/>. */
+ <https://www.gnu.org/licenses/>. */
-#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
-#include <string.h>
-
-/* lockf.c defines lockf64 as an alias if __OFF_T_MATCHES_OFF64_T. */
-#ifndef __OFF_T_MATCHES_OFF64_T
/* lockf is a simplified interface to fcntl's locking facilities. */
-
int
-lockf64 (int fd, int cmd, off64_t len64)
+__lockf64 (int fd, int cmd, off64_t len64)
{
- struct flock fl;
- off_t len = (off_t) len64;
-
- if (len64 != (off64_t) len)
- {
- /* We can't represent the length. */
- __set_errno (EOVERFLOW);
- return -1;
- }
-
- memset ((char *) &fl, '\0', sizeof (fl));
-
/* lockf is always relative to the current file position. */
- fl.l_whence = SEEK_CUR;
- fl.l_start = 0;
- fl.l_len = len;
-
+ 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. */
- fl.l_type = F_RDLCK;
- if (__fcntl (fd, F_GETLK, &fl) < 0)
+ fl64.l_type = F_RDLCK;
+ if (__fcntl (fd, F_GETLK64, &fl64) < 0)
return -1;
- if (fl.l_type == F_UNLCK || fl.l_pid == __getpid ())
- return 0;
+ if (fl64.l_type == F_UNLCK || fl64.l_pid == __getpid ())
+ return 0;
__set_errno (EACCES);
return -1;
-
case F_ULOCK:
- fl.l_type = F_UNLCK;
- cmd = F_SETLK;
- break;
+ fl64.l_type = F_UNLCK;
+ return __fcntl64 (fd, F_SETLK64, &fl64);
case F_LOCK:
- fl.l_type = F_WRLCK;
- cmd = F_SETLKW;
- break;
+ return __fcntl64 (fd, F_SETLKW64, &fl64);
case F_TLOCK:
- fl.l_type = F_WRLCK;
- cmd = F_SETLK;
- break;
-
- default:
- __set_errno (EINVAL);
- return -1;
+ return __fcntl64 (fd, F_SETLK64, &fl64);
}
-
- return __fcntl (fd, cmd, &fl);
+ __set_errno (EINVAL);
+ return -1;
}
-
+weak_alias (__lockf64, lockf64)
+#ifdef __OFF_T_MATCHES_OFF64_T
+weak_alias (lockf64, lockf)
#endif