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sourceware.org Git - glibc.git/blob - sysdeps/posix/flock.c
1 /* Copyright (C) 1992-2015 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 /* This file implements the `flock' function in terms of the POSIX.1 `fcntl'
19 locking mechanism. In 4BSD, these are two incompatible locking mechanisms,
20 perhaps with different semantics? */
27 /* Apply or remove an advisory lock, according to OPERATION,
28 on the file FD refers to. */
30 __flock (int fd
, int operation
)
34 switch (operation
& ~LOCK_NB
)
37 lbuf
.l_type
= F_RDLCK
;
40 lbuf
.l_type
= F_WRLCK
;
43 lbuf
.l_type
= F_UNLCK
;
50 lbuf
.l_whence
= SEEK_SET
;
51 lbuf
.l_start
= lbuf
.l_len
= 0L; /* Lock the whole file. */
53 return __fcntl (fd
, (operation
& LOCK_NB
) ? F_SETLK
: F_SETLKW
, &lbuf
);
56 weak_alias (__flock
, flock
)
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