69 lines
2.7 KiB
C
69 lines
2.7 KiB
C
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/* The <fcntl.h> header is needed by the open() and fcntl() system calls,
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* which have a variety of parameters and flags. They are described here.
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* The formats of the calls to each of these are:
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*
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* open(path, oflag [,mode]) open a file
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* fcntl(fd, cmd [,arg]) get or set file attributes
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*
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*/
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#ifndef _FCNTL_H
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#define _FCNTL_H
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#ifndef _TYPES_H
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#include <sys/types.h>
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#endif
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/* These values are used for cmd in fcntl(). POSIX Table 6-1. */
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#define F_DUPFD 0 /* duplicate file descriptor */
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#define F_GETFD 1 /* get file descriptor flags */
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#define F_SETFD 2 /* set file descriptor flags */
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#define F_GETFL 3 /* get file status flags */
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#define F_SETFL 4 /* set file status flags */
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#define F_GETLK 5 /* get record locking information */
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#define F_SETLK 6 /* set record locking information */
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#define F_SETLKW 7 /* set record locking info; wait if blocked */
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/* File descriptor flags used for fcntl(). POSIX Table 6-2. */
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#define FD_CLOEXEC 1 /* close on exec flag for third arg of fcntl */
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/* L_type values for record locking with fcntl(). POSIX Table 6-3. */
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#define F_RDLCK 1 /* shared or read lock */
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#define F_WRLCK 2 /* exclusive or write lock */
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#define F_UNLCK 3 /* unlock */
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/* Oflag values for open(). POSIX Table 6-4. */
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#define O_CREAT 00100 /* creat file if it doesn't exist */
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#define O_EXCL 00200 /* exclusive use flag */
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#define O_NOCTTY 00400 /* do not assign a controlling terminal */
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#define O_TRUNC 01000 /* truncate flag */
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/* File status flags for open() and fcntl(). POSIX Table 6-5. */
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#define O_APPEND 02000 /* set append mode */
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#define O_NONBLOCK 04000 /* no delay */
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/* File access modes for open() and fcntl(). POSIX Table 6-6. */
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#define O_RDONLY 0 /* open(name, O_RDONLY) opens read only */
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#define O_WRONLY 1 /* open(name, O_WRONLY) opens write only */
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#define O_RDWR 2 /* open(name, O_RDWR) opens read/write */
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/* Mask for use with file access modes. POSIX Table 6-7. */
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#define O_ACCMODE 03 /* mask for file access modes */
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/* Struct used for locking. POSIX Table 6-8. */
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struct flock {
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short l_type; /* type: F_RDLCK, F_WRLCK, or F_UNLCK */
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short l_whence; /* flag for starting offset */
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off_t l_start; /* relative offset in bytes */
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off_t l_len; /* size; if 0, then until EOF */
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pid_t l_pid; /* process id of the locks' owner */
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};
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/* Function Prototypes. */
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_PROTOTYPE( int creat, (const char *_path, Mode_t _mode) );
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_PROTOTYPE( int fcntl, (int _filedes, int _cmd, ...) );
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_PROTOTYPE( int open, (const char *_path, int _oflag, ...) );
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#endif /* _FCNTL_H */
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