home *** CD-ROM | disk | FTP | other *** search
- /* fcntl.h extension header for the RISC OS SharedCLibrary.
- Copyright (c) 1997-2005 Nick Burrett
- All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- 2. Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the distribution.
- 3. The name of the author may not be used to endorse or promote products
- derived from this software without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
-
- #ifndef __FCNTL_H
- #define __FCNTL_H
-
- #ifndef __SYS_TYPES_H
- #include <sys/types.h>
- #endif
-
- #ifdef __cplusplus
- extern "C" {
- #endif
-
- /* File access modes for open() and fcntl() */
-
- /* These fcntlbits are derived from BSD 4.4 */
-
- #define O_RDONLY 0 /* Open for read only. */
- #define O_WRONLY 1 /* Open for write only. */
- #define O_RDWR 2 /* Open for read/write. */
-
- /* Mask for file access modes. */
- #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR)
-
- /* Bits OR'd into the second argument to open. */
-
- /* Create file if it doesn't exist. */
- #define O_CREAT 0x0200
- /* Fail if file already exists. */
- #define O_EXCL 0x0800
- /* Truncate file to zero length. */
- #define O_TRUNC 0x0400
- /* Send SIGIO to owner when data is ready. */
- #define O_ASYNC 0x0040
- /* Synchronous writes. */
- #define O_FSYNC 0x0080
- #define O_SYNC O_FSYNC
- /* Open with shared file lock. */
- #define O_SHLOCK 0x0010
- /* Open with shared exclusive lock. */
- #define O_EXLOCK 0x0020
-
- /* File status flags for open and fcntl. */
-
- /* Writes append to the file. */
- #define O_APPEND 0x0008
- /* Non-blocking I/O. */
- #define O_NONBLOCK 0x0004
- #define O_NDELAY O_NONBLOCK
-
- /* close on exec() flag - must be bit 8 */
- #define O_EXECCL 0x0100
-
- /* Strict POSIX doesn't allow this. */
- #define O_BINARY 0x2000
- #define O_TEXT 0x1000
-
- #define O_PIPE 0x4000 /* UnixLib specific */
- #define O_UNLINKED 0x8000 /* UnixLib specific - unlink file on close */
-
-
-
- /* Duplicate file descriptor. */
- #define F_DUPFD 0
- /* Return file descriptor flags. */
- #define F_GETFD 1
- /* Set file descriptor flags. */
- #define F_SETFD 2
- /* Read file status flags. */
- #define F_GETFL 3
- /* Set file status flags. */
- #define F_SETFL 4
- /* Get owner (receiver of SIGIO). */
- #define F_GETOWN 5
- /* Set owner (receiver of SIGIO). */
- #define F_SETOWN 6
- /* Get record locking info. */
- #define F_GETLK 7
- /* Set record locking info (non-blocking). */
- #define F_SETLK 8
- /* Set record locking info (blocking). */
- #define F_SETLKW 9
- /* Get unlink on close (UnixLib internal - currently implements tmpfile). */
- #define F_GETUNL 10
- /* Set unlink on close (could be used to emulate open() then unlink trick). */
- #define F_SETUNL 11
-
- /* Bits in the file status flags returned by F_GETFL. */
- #define FREAD 1
- #define FWRITE 2
-
- /* Traditional BSD names the O_* bits. */
- #define FASYNC O_ASYNC
- #define FCREAT O_CREAT
- #define FEXCL O_EXCL
- #define FTRUNC O_TRUNC
- #define FNOCTTY O_NOCTTY
- #define FFSYNC O_FSYNC
- #define FSYNC O_SYNC
- #define FAPPEND O_APPEND
- #define FNONBLOCK O_NONBLOCK
- #define FNDELAY O_NDELAY
-
-
- /* If set, cause the file descriptor to be closed if an exec function
- is used. Initially, set clear. */
- #define FD_CLOEXEC O_EXECCL
-
- /* 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
- {
- /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
- short int l_type;
- /* Where `l_start' is relative to (like `lseek'). */
- short int l_whence;
- /* Offset where the lock begins. */
- __off_t l_start;
- /* Size of the locked area; zero means until EOF. */
- __off_t l_len;
- /* Process holding the lock. */
- short int l_pid;
- };
-
- /* 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. */
-
-
- #ifndef R_OK
- /* Straight from <unistd.h>. */
-
- /* Values for the second argument to access.
- These may be OR'd together. */
-
- /* Test for read permission. */
- #define R_OK 4
- /* Test for write permission. */
- #define W_OK 2
- /* Test for execute permission. */
- #define X_OK 1
- /* Test for existence. */
- #define F_OK 0
- #endif
-
-
- /* Do the file control operation described by CMD on FD.
- The remaining arguments are interpreted depending on CMD. */
- extern int fcntl (int fd, int cmd, ...);
-
- /* Open FILE and return a new file descriptor for it, or -1 on error.
- OFLAG determines the type of access used. If O_CREAT is on OFLAG,
- the third argument is taken as a `mode_t', the mode of the created file. */
- extern int open (const char *file, int oflag, ...);
-
- /* Create and open FILE, with mode MODE.
- This takes an `int' MODE argument because that is
- what `mode_t' will be widened to. */
- extern int creat (const char *file, __mode_t mode);
-
- #ifdef __cplusplus
- }
- #endif
-
- #endif
-