| 1 | /* The <fcntl.h> header is needed by the open() and fcntl() system calls,
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| 2 | * which have a variety of parameters and flags. They are described here.
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| 3 | * The formats of the calls to each of these are:
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| 4 | *
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| 5 | * open(path, oflag [,mode]) open a file
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| 6 | * fcntl(fd, cmd [,arg]) get or set file attributes
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| 7 | *
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| 8 | */
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| 9 |
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| 10 | #ifndef _FCNTL_H
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| 11 | #define _FCNTL_H
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| 12 |
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| 13 | #ifndef _TYPES_H
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| 14 | #include <sys/types.h>
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| 15 | #endif
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| 16 |
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| 17 | /* These values are used for cmd in fcntl(). POSIX Table 6-1. */
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| 18 | #define F_DUPFD 0 /* duplicate file descriptor */
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| 19 | #define F_GETFD 1 /* get file descriptor flags */
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| 20 | #define F_SETFD 2 /* set file descriptor flags */
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| 21 | #define F_GETFL 3 /* get file status flags */
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| 22 | #define F_SETFL 4 /* set file status flags */
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| 23 | #define F_GETLK 5 /* get record locking information */
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| 24 | #define F_SETLK 6 /* set record locking information */
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| 25 | #define F_SETLKW 7 /* set record locking info; wait if blocked */
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| 26 | #define F_FREESP 8 /* free a section of a regular file */
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| 27 |
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| 28 | /* File descriptor flags used for fcntl(). POSIX Table 6-2. */
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| 29 | #define FD_CLOEXEC 1 /* close on exec flag for third arg of fcntl */
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| 30 |
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| 31 | /* L_type values for record locking with fcntl(). POSIX Table 6-3. */
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| 32 | #define F_RDLCK 1 /* shared or read lock */
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| 33 | #define F_WRLCK 2 /* exclusive or write lock */
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| 34 | #define F_UNLCK 3 /* unlock */
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| 35 |
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| 36 | /* Oflag values for open(). POSIX Table 6-4. */
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| 37 | #define O_CREAT 00100 /* creat file if it doesn't exist */
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| 38 | #define O_EXCL 00200 /* exclusive use flag */
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| 39 | #define O_NOCTTY 00400 /* do not assign a controlling terminal */
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| 40 | #define O_TRUNC 01000 /* truncate flag */
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| 41 |
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| 42 | /* File status flags for open() and fcntl(). POSIX Table 6-5. */
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| 43 | #define O_APPEND 02000 /* set append mode */
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| 44 | #define O_NONBLOCK 04000 /* no delay */
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| 45 |
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| 46 | /* File access modes for open() and fcntl(). POSIX Table 6-6. */
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| 47 | #define O_RDONLY 0 /* open(name, O_RDONLY) opens read only */
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| 48 | #define O_WRONLY 1 /* open(name, O_WRONLY) opens write only */
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| 49 | #define O_RDWR 2 /* open(name, O_RDWR) opens read/write */
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| 50 |
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| 51 | /* Mask for use with file access modes. POSIX Table 6-7. */
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| 52 | #define O_ACCMODE 03 /* mask for file access modes */
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| 53 |
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| 54 | /* Struct used for locking. POSIX Table 6-8. */
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| 55 | struct flock {
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| 56 | short l_type; /* type: F_RDLCK, F_WRLCK, or F_UNLCK */
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| 57 | short l_whence; /* flag for starting offset */
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| 58 | off_t l_start; /* relative offset in bytes */
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| 59 | off_t l_len; /* size; if 0, then until EOF */
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| 60 | pid_t l_pid; /* process id of the locks' owner */
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| 61 | };
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| 62 |
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| 63 | /* Function Prototypes. */
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| 64 | _PROTOTYPE( int creat, (const char *_path, _mnx_Mode_t _mode) );
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| 65 | _PROTOTYPE( int fcntl, (int _filedes, int _cmd, ...) );
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| 66 | _PROTOTYPE( int open, (const char *_path, int _oflag, ...) );
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| 67 |
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| 68 | /* For locking files. */
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| 69 | #define LOCK_SH F_RDLCK /* Shared lock */
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| 70 | #define LOCK_EX F_WRLCK /* Exclusive lock */
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| 71 | #define LOCK_NB 0x0080 /* Do not block when locking */
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| 72 | #define LOCK_UN F_UNLCK /* Unlock */
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| 73 |
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| 74 | _PROTOTYPE( int flock, (int fd, int mode) );
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| 75 |
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| 76 | #endif /* _FCNTL_H */
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