fcntl.h

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C头文件 代码 · 共 92 行

/* open/fcntl - O_SYNC is only implemented on blocks devices and on files
   located on an ext2 file system */
#define O_ACCMODE   0x0003
#define O_RDONLY    0x0000
#define O_WRONLY    0x0001
#define O_RDWR      0x0002
#define O_APPEND    0x0008
#define O_SYNC      0x0010
#define O_NONBLOCK  0x0080
#define O_CREAT     0x0100  /* not fcntl */
#define O_TRUNC     0x0200  /* not fcntl */
#define O_EXCL      0x0400  /* not fcntl */
#define O_NOCTTY    0x0800  /* not fcntl */
#define FASYNC      0x1000  /* fcntl, for BSD compatibility */
#define O_LARGEFILE 0x2000  /* allow large file opens */
#define O_DIRECT    0x8000  /* direct disk access hint */
#define O_DIRECTORY 0x10000 /* must be a directory */
#define O_NOFOLLOW  0x20000 /* don't follow links */
#define O_NOATIME   0x40000

#define O_NDELAY    O_NONBLOCK

#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     14
#define F_SETLK     6
#define F_SETLKW    7

#define F_SETOWN    24  /*  for sockets. */
#define F_GETOWN    23  /*  for sockets. */
#define F_SETSIG    10  /*  for sockets. */
#define F_GETSIG    11  /*  for sockets. */

#define F_GETLK64   33  /*  using 'struct flock64' */
#define F_SETLK64   34
#define F_SETLKW64  35

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

/* for posix fcntl() and lockf() */
#define F_RDLCK     0
#define F_WRLCK     1
#define F_UNLCK     2

/* for old implementation of bsd flock () */
#define F_EXLCK     4   /* or 3 */
#define F_SHLCK     8   /* or 4 */

/* for leases */
#define F_INPROGRESS    16

/* 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 */

/*
 * The flavours of struct flock.  "struct flock" is the ABI compliant
 * variant.  Finally struct flock64 is the LFS variant of struct flock.  As
 * a historic accident and inconsistence with the ABI definition it doesn't
 * contain all the same fields as struct flock.
 */

typedef struct flock {
    short   l_type;
    short   l_whence;
    off_t   l_start;
    off_t   l_len;
    long    l_sysid;
    pid_t   l_pid;
    long    pad[4];
} flock_t;

typedef struct flock64 {
    short   l_type;
    short   l_whence;
    loff_t  l_start;
    loff_t  l_len;
    pid_t   l_pid;
} flock64_t;