FreeBSD/Linux Kernel Cross Reference
sys/include/fcntl.h
1 /* The <fcntl.h> header is needed by the open() and fcntl() system calls,
2 * which have a variety of parameters and flags. They are described here.
3 * The formats of the calls to each of these are:
4 *
5 * open(path, oflag [,mode]) open a file
6 * fcntl(fd, cmd [,arg]) get or set file attributes
7 *
8 */
9
10 #ifndef _FCNTL_H
11 #define _FCNTL_H
12
13 #ifndef _TYPES_H
14 #include <sys/types.h>
15 #endif
16
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 5 /* get record locking information */
24 #define F_SETLK 6 /* set record locking information */
25 #define F_SETLKW 7 /* set record locking info; wait if blocked */
26
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 */
29
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 */
34
35 /* Oflag values for open(). POSIX Table 6-4. */
36 #define O_CREAT 00100 /* creat file if it doesn't exist */
37 #define O_EXCL 00200 /* exclusive use flag */
38 #define O_NOCTTY 00400 /* do not assign a controlling terminal */
39 #define O_TRUNC 01000 /* truncate flag */
40
41 /* File status flags for open() and fcntl(). POSIX Table 6-5. */
42 #define O_APPEND 02000 /* set append mode */
43 #define O_NONBLOCK 04000 /* no delay */
44
45 /* File access modes for open() and fcntl(). POSIX Table 6-6. */
46 #define O_RDONLY 0 /* open(name, O_RDONLY) opens read only */
47 #define O_WRONLY 1 /* open(name, O_WRONLY) opens write only */
48 #define O_RDWR 2 /* open(name, O_RDWR) opens read/write */
49
50 /* Mask for use with file access modes. POSIX Table 6-7. */
51 #define O_ACCMODE 03 /* mask for file access modes */
52
53 /* Struct used for locking. POSIX Table 6-8. */
54 struct flock {
55 short l_type; /* type: F_RDLCK, F_WRLCK, or F_UNLCK */
56 short l_whence; /* flag for starting offset */
57 off_t l_start; /* relative offset in bytes */
58 off_t l_len; /* size; if 0, then until EOF */
59 pid_t l_pid; /* process id of the locks' owner */
60 };
61
62 /* Function Prototypes. */
63 _PROTOTYPE( int creat, (const char *_path, _mnx_Mode_t _mode) );
64 _PROTOTYPE( int fcntl, (int _filedes, int _cmd, ...) );
65 _PROTOTYPE( int open, (const char *_path, int _oflag, ...) );
66
67 #endif /* _FCNTL_H */
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