1 /* $Id: fcntl.h,v 1.2 1994/06/24 11:05:16 ceriel Exp $ */
3 /* Copied from Minix, with some changes */
4 /* The <fcntl.h> header is needed by the open() and fcntl() system calls,
5 * which have a variety of parameters and flags. They are described here.
6 * The formats of the calls to each of these are:
8 * open(path, oflag [,mode]) open a file
9 * fcntl(fd, cmd [,arg]) get or set file attributes
17 /* These values are used for cmd in fcntl(). POSIX Table 6-1. */
18 #define F_DUPFD 0 /* duplicate file descriptor */
19 #define F_GETFD 1 /* get file descriptor flags */
20 #define F_SETFD 2 /* set file descriptor flags */
21 #define F_GETFL 3 /* get file status flags */
22 #define F_SETFL 4 /* set file status flags */
23 #define F_GETLK 7 /* get record locking information */
24 #define F_SETLK 8 /* set record locking information */
25 #define F_SETLKW 9 /* set record locking info; wait if blocked */
27 /* File descriptor flags used for fcntl(). POSIX Table 6-2. */
28 #define FD_CLOEXEC 1 /* close on exec flag for third arg of fcntl */
30 /* L_type values for record locking with fcntl(). POSIX Table 6-3. */
31 #define F_RDLCK 1 /* shared or read lock */
32 #define F_WRLCK 2 /* exclusive or write lock */
33 #define F_UNLCK 3 /* unlock */
35 /* Oflag values for open(). POSIX Table 6-4. */
36 #define O_CREAT 0001000 /* creat file if it doesn't exist */
37 #define O_EXCL 0004000 /* exclusive use flag */
38 #define O_NOCTTY 0100000 /* do not assign a controlling terminal */
39 #define O_TRUNC 0002000 /* truncate flag */
41 /* File status flags for open() and fcntl(). POSIX Table 6-5. */
42 #define O_APPEND 0000010 /* set append mode */
43 #define O_NONBLOCK 0040000 /* no delay */
44 #define O_NDELAY 0000004 /* no delay (BSD) */
46 /* File access modes for open() and fcntl(). POSIX Table 6-6. */
47 #define O_RDONLY 0 /* open(name, O_RDONLY) opens read only */
48 #define O_WRONLY 1 /* open(name, O_WRONLY) opens write only */
49 #define O_RDWR 2 /* open(name, O_RDWR) opens read/write */
51 /* Mask for use with file access modes. POSIX Table 6-7. */
52 #define O_ACCMODE 03 /* mask for file access modes */