1 /* Provide a more complete sys/file.h.
3 Copyright (C) 2007-2024 Free Software Foundation, Inc.
5 This file is free software: you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
10 This file 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
13 GNU Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
18 /* Written by Richard W.M. Jones. */
20 #ifndef _@GUARD_PREFIX@_SYS_FILE_H
23 @PRAGMA_SYSTEM_HEADER@
27 /* The include_next requires a split double-inclusion guard. */
29 # @INCLUDE_NEXT@ @NEXT_SYS_FILE_H@
32 #ifndef _@GUARD_PREFIX@_SYS_FILE_H
33 #define _@GUARD_PREFIX@_SYS_FILE_H
35 /* This file uses GNULIB_POSIXCHECK, HAVE_RAW_DECL_*. */
36 #if !_GL_CONFIG_H_INCLUDED
37 #error "Please include config.h first."
41 /* Operations for the 'flock' call (same as Linux kernel constants). */
42 # define LOCK_SH 1 /* Shared lock. */
43 # define LOCK_EX 2 /* Exclusive lock. */
44 # define LOCK_UN 8 /* Unlock. */
46 /* Can be OR'd into one of the above. */
47 # define LOCK_NB 4 /* Don't block when locking. */
50 /* The definition of _GL_WARN_ON_USE is copied here. */
53 /* Apply or remove advisory locks on an open file.
54 Return 0 if successful, otherwise -1 and errno set. */
56 extern int flock (int fd
, int operation
);
58 #elif defined GNULIB_POSIXCHECK
60 # if HAVE_RAW_DECL_FLOCK
61 _GL_WARN_ON_USE (flock
, "flock is unportable - "
62 "use gnulib module flock for portability");
67 #endif /* _@GUARD_PREFIX@_SYS_FILE_H */
68 #endif /* _@GUARD_PREFIX@_SYS_FILE_H */