FreeBSD/Linux Kernel Cross Reference
sys/include/asm-alpha/fcntl.h

     #ifndef _ALPHA_FCNTL_H
     #define _ALPHA_FCNTL_H
     
     /* open/fcntl - O_SYNC is only implemented on blocks devices and on files
        located on an ext2 file system */
     #define O_ACCMODE         0003
     #define O_RDONLY            00
     #define O_WRONLY            01
     #define O_RDWR              02
    #define O_CREAT          01000  /* not fcntl */
    #define O_TRUNC          02000  /* not fcntl */
    #define O_EXCL           04000  /* not fcntl */
    #define O_NOCTTY        010000  /* not fcntl */
    
    #define O_NONBLOCK       00004
    #define O_APPEND         00010
    #define O_NDELAY        O_NONBLOCK
    #define O_SYNC          040000
    #define FASYNC          020000  /* fcntl, for BSD compatibility */
    #define O_DIRECTORY     0100000 /* must be a directory */
    #define O_NOFOLLOW      0200000 /* don't follow links */
    #define O_LARGEFILE     0400000 /* will be set by the kernel on every open */
    #define O_DIRECT        02000000 /* direct disk access - should check with OSF/1 */
    
    #define F_DUPFD         0       /* dup */
    #define F_GETFD         1       /* get close_on_exec */
    #define F_SETFD         2       /* set/clear close_on_exec */
    #define F_GETFL         3       /* get file->f_flags */
    #define F_SETFL         4       /* set file->f_flags */
    #define F_GETLK         7
    #define F_SETLK         8
    #define F_SETLKW        9
    
    #define F_SETOWN        5       /*  for sockets. */
    #define F_GETOWN        6       /*  for sockets. */
    #define F_SETSIG        10      /*  for sockets. */
    #define F_GETSIG        11      /*  for sockets. */
    
    /* for F_[GET|SET]FL */
    #define FD_CLOEXEC      1       /* actually anything with low bit set goes */
    
    /* for posix fcntl() and lockf() */
    #define F_RDLCK         1
    #define F_WRLCK         2
    #define F_UNLCK         8
    
    /* for old implementation of bsd flock () */
    #define F_EXLCK         16      /* or 3 */
    #define F_SHLCK         32      /* or 4 */
    
    #define F_INPROGRESS    64
    
    /* operations for bsd flock(), also used by the kernel implementation */
    #define LOCK_SH         1       /* shared lock */
    #define LOCK_EX         2       /* exclusive lock */
    #define LOCK_NB         4       /* or'd with one of the above to prevent
                                       blocking */
    #define LOCK_UN         8       /* remove lock */
    #define LOCK_MAND      32      /* This is a mandatory flock */
    #define LOCK_READ      64      /* ... Which allows concurrent read operations */
    #define LOCK_WRITE     128     /* ... Which allows concurrent write operations */
    #define LOCK_RW        192     /* ... Which allows concurrent read & write ops */
     
    struct flock {
            short l_type;
            short l_whence;
            __kernel_off_t l_start;
            __kernel_off_t l_len;
            __kernel_pid_t l_pid;
    };
    
    #ifdef __KERNEL__
    #define flock64 flock
    #endif
    #define F_LINUX_SPECIFIC_BASE  1024
    
    #endif

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