diff options
Diffstat (limited to 'sysdeps/unix/sysv/bits/fcntl.h')
| -rw-r--r-- | sysdeps/unix/sysv/bits/fcntl.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/bits/fcntl.h b/sysdeps/unix/sysv/bits/fcntl.h new file mode 100644 index 0000000000..22863ffa5e --- /dev/null +++ b/sysdeps/unix/sysv/bits/fcntl.h @@ -0,0 +1,94 @@ +/* O_*, F_*, FD_* bit values for System V. + Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _FCNTL_H +#error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead." +#endif + + +/* File access modes for `open' and `fcntl'. */ +#define O_RDONLY 0 /* Open read-only. */ +#define O_WRONLY 1 /* Open write-only. */ +#define O_RDWR 2 /* Open read/write. */ + + +/* Bits OR'd into the second argument to open. */ +#define O_CREAT 00400 /* Create file if it doesn't exist. */ +#define O_EXCL 02000 /* Fail if file already exists. */ +#define O_TRUNC 01000 /* Truncate file to zero length. */ +#if defined __USE_BSD || defined __USE_SVID +#define O_SYNC 00020 /* Synchronous writes. */ +#define O_FSYNC O_SYNC +#endif + +/* File status flags for `open' and `fcntl'. */ +#define O_APPEND 000010 /* Writes append to the file. */ +#define O_NONBLOCK 000004 /* Non-blocking I/O. */ + +#ifdef __USE_BSD +/* System V doesn't support POSIX.1 O_NONBLOCK, but O_NDELAY is close. */ +#define O_NDELAY O_NONBLOCK +#endif + +/* Mask for file access modes. This is system-dependent in case + some system ever wants to define some other flavor of access. */ +#define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR) + +/* Values for the second argument to `fcntl'. */ +#define F_DUPFD 0 /* Duplicate file descriptor. */ +#define F_GETFD 1 /* Get file descriptor flags. */ +#define F_SETFD 2 /* Set file descriptor flags. */ +#define F_GETFL 3 /* Get file status flags. */ +#define F_SETFL 4 /* Set file status flags. */ +#define F_GETLK 5 /* Get record locking info. */ +#define F_SETLK 6 /* Set record locking info. */ +#define F_SETLKW 7 /* Set record locking info, wait. */ + +/* File descriptor flags used with F_GETFD and F_SETFD. */ +#define FD_CLOEXEC 1 /* Close on exec. */ + + +#include <bits/types.h> + +/* The structure describing an advisory lock. This is the type of the third + argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests. */ +struct flock + { + short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */ + short int l_whence; /* Where `l_start' is relative to (like `lseek'). */ + __off_t l_start; /* Offset where the lock begins. */ + __off_t l_len; /* Size of the locked area; zero means until EOF. */ + short int l_sysid; /* System ID where locking process resides. */ + short int l_pid; /* Process holding the lock. */ + }; + +/* Values for the `l_type' field of a `struct flock'. */ +#define F_RDLCK 1 /* Read lock. */ +#define F_WRLCK 2 /* Write lock. */ +#define F_UNLCK 3 /* Remove lock. */ + + +/* Define some more compatibility macros to be backward compatible with + BSD systems which did not managed to hide these kernel macros. */ +#ifdef __USE_BSD +#define FAPPEND O_APPEND +#define FFSYNC O_FSYNC +#define FNONBLOCK O_NONBLOCK +#define FNDELAY O_NDELAY +#endif /* Use BSD. */ |