fcntl.h

一个用于学习的操作系统

#ifndef _FCNTL_H
#define _FCNTL_H

/* open/fcntl - O_SYNC isn't implemented yet */
#define O_ACCMODE      0003
#define O_RDONLY        00
#define O_WRONLY        01
#define O_RDWR            02
#define O_CREAT          0100    /* not fcntl */
#define O_EXCL          0200    /* not fcntl */
#define O_NOCTTY      0400    /* not fcntl */
#define O_TRUNC         01000    /* not fcntl */
#define O_APPEND     02000
#define O_NONBLOCK     04000
#define O_NDELAY    O_NONBLOCK
#define O_SYNC        010000

/* Defines for fcntl-commands. Note that currently
 * locking isn't supported, and other things aren't really
 * tested.
 */
#define F_DUPFD        0    /* dup */
#define F_GETFD        1    /* get f_flags */
#define F_SETFD        2    /* set f_flags */
#define F_GETFL        3    /* more flags (cloexec) */
#define F_SETFL        4
#define F_GETLK        5    /* not implemented */
#define F_SETLK        6
#define F_SETLKW    7

/* for F_[GET|SET]FL */
#define FD_CLOEXEC    1    /* actually anything with low bit set goes */

/* Ok, these are locking features, and aren't implemented at any
 * level. POSIX wants them.
 */
#define F_RDLCK        0
#define F_WRLCK        1
#define F_UNLCK        2

/* Once again - not implemented, but ... */
struct flock {
    short l_type;
    short l_whence;
    off_t l_start;
    off_t l_len;
    pid_t l_pid;
};

#endif