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sourceware.org Git - glibc.git/blob - io/lockf64.c
1 /* Copyright (C) 1994-2012 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
18 #include <sys/types.h>
24 /* lockf.c defines lockf64 as an lias if __OFF_T_MATCHES_OFF64_T. */
25 #ifndef __OFF_T_MATCHES_OFF64_T
27 /* lockf is a simplified interface to fcntl's locking facilities. */
30 lockf64 (int fd
, int cmd
, off64_t len64
)
33 off_t len
= (off_t
) len64
;
35 if (len64
!= (off64_t
) len
)
37 /* We can't represent the length. */
38 __set_errno (EOVERFLOW
);
42 memset ((char *) &fl
, '\0', sizeof (fl
));
44 /* lockf is always relative to the current file position. */
45 fl
.l_whence
= SEEK_CUR
;
52 /* Test the lock: return 0 if FD is unlocked or locked by this process;
53 return -1, set errno to EACCES, if another process holds the lock. */
55 if (__fcntl (fd
, F_GETLK
, &fl
) < 0)
57 if (fl
.l_type
== F_UNLCK
|| fl
.l_pid
== __getpid ())
80 return __fcntl (fd
, cmd
, &fl
);
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