| 1 | /* Copyright (C) 1991-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #ifndef _SYS_FILE_H |
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| 19 | #define _SYS_FILE_H 1 |
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| 20 | |
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| 21 | #include <features.h> |
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| 22 | |
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| 23 | #ifndef _FCNTL_H |
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| 24 | # include <fcntl.h> |
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| 25 | #endif |
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| 26 | |
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| 27 | __BEGIN_DECLS |
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| 28 | |
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| 29 | |
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| 30 | /* Alternate names for values for the WHENCE argument to `lseek'. |
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| 31 | These are the same as SEEK_SET, SEEK_CUR, and SEEK_END, respectively. */ |
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| 32 | #ifndef L_SET |
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| 33 | # define L_SET 0 /* Seek from beginning of file. */ |
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| 34 | # define L_INCR 1 /* Seek from current position. */ |
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| 35 | # define L_XTND 2 /* Seek from end of file. */ |
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| 36 | #endif |
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| 37 | |
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| 38 | |
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| 39 | /* Operations for the `flock' call. */ |
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| 40 | #define LOCK_SH 1 /* Shared lock. */ |
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| 41 | #define LOCK_EX 2 /* Exclusive lock. */ |
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| 42 | #define LOCK_UN 8 /* Unlock. */ |
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| 43 | |
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| 44 | /* Can be OR'd in to one of the above. */ |
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| 45 | #define LOCK_NB 4 /* Don't block when locking. */ |
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| 46 | |
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| 47 | |
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| 48 | /* Apply or remove an advisory lock, according to OPERATION, |
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| 49 | on the file FD refers to. */ |
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| 50 | extern int flock (int __fd, int __operation) __THROW; |
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| 51 | |
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| 52 | |
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| 53 | __END_DECLS |
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| 54 | |
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| 55 | #endif /* sys/file.h */ |
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| 56 | |
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