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1/* flock structure. Generic version.
2 Copyright (C) 1993-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <sys/types.h>
20
21/* The structure describing an advisory lock. This is the type of the third
22 argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests. */
23struct flock
24 {
25 short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
26 short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
27#ifndef __USE_FILE_OFFSET64
28 __off_t l_start; /* Offset where the lock begins. */
29 __off_t l_len; /* Size of the locked area; zero means until EOF. */
30#else
31 __off64_t l_start; /* Offset where the lock begins. */
32 __off64_t l_len; /* Size of the locked area; zero means until EOF. */
33#endif
34 __pid_t l_pid; /* Process holding the lock. */
35 };
36
37#ifdef __USE_LARGEFILE64
38struct flock64
39 {
40 short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
41 short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
42 __off64_t l_start; /* Offset where the lock begins. */
43 __off64_t l_len; /* Size of the locked area; zero means until EOF. */
44 __pid_t l_pid; /* Process holding the lock. */
45 };
46#endif
47

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source code of glibc/sysdeps/mach/hurd/bits/types/struct_flock.h