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94 lines
3.5 KiB
C
94 lines
3.5 KiB
C
/* O_*, F_*, FD_* bit values for System V.
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Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _FCNTL_H
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#error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
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#endif
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/* File access modes for `open' and `fcntl'. */
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#define O_RDONLY 0 /* Open read-only. */
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#define O_WRONLY 1 /* Open write-only. */
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#define O_RDWR 2 /* Open read/write. */
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/* Bits OR'd into the second argument to open. */
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#define O_CREAT 00400 /* Create file if it doesn't exist. */
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#define O_EXCL 02000 /* Fail if file already exists. */
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#define O_TRUNC 01000 /* Truncate file to zero length. */
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#if defined __USE_BSD || defined __USE_SVID
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#define O_SYNC 00020 /* Synchronous writes. */
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#define O_FSYNC O_SYNC
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#endif
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/* File status flags for `open' and `fcntl'. */
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#define O_APPEND 000010 /* Writes append to the file. */
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#define O_NONBLOCK 000004 /* Non-blocking I/O. */
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#ifdef __USE_BSD
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/* System V doesn't support POSIX.1 O_NONBLOCK, but O_NDELAY is close. */
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#define O_NDELAY O_NONBLOCK
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#endif
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/* Mask for file access modes. This is system-dependent in case
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some system ever wants to define some other flavor of access. */
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#define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
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/* Values for the second argument to `fcntl'. */
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#define F_DUPFD 0 /* Duplicate file descriptor. */
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#define F_GETFD 1 /* Get file descriptor flags. */
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#define F_SETFD 2 /* Set file descriptor flags. */
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#define F_GETFL 3 /* Get file status flags. */
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#define F_SETFL 4 /* Set file status flags. */
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#define F_GETLK 5 /* Get record locking info. */
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#define F_SETLK 6 /* Set record locking info. */
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#define F_SETLKW 7 /* Set record locking info, wait. */
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/* File descriptor flags used with F_GETFD and F_SETFD. */
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#define FD_CLOEXEC 1 /* Close on exec. */
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#include <bits/types.h>
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/* The structure describing an advisory lock. This is the type of the third
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argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests. */
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struct flock
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{
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short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
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short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
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__off_t l_start; /* Offset where the lock begins. */
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__off_t l_len; /* Size of the locked area; zero means until EOF. */
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short int l_sysid; /* System ID where locking process resides. */
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short int l_pid; /* Process holding the lock. */
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};
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/* Values for the `l_type' field of a `struct flock'. */
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#define F_RDLCK 1 /* Read lock. */
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#define F_WRLCK 2 /* Write lock. */
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#define F_UNLCK 3 /* Remove lock. */
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/* Define some more compatibility macros to be backward compatible with
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BSD systems which did not managed to hide these kernel macros. */
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#ifdef __USE_BSD
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#define FAPPEND O_APPEND
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#define FFSYNC O_FSYNC
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#define FNONBLOCK O_NONBLOCK
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#define FNDELAY O_NDELAY
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#endif /* Use BSD. */
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