fcntl.h

Go to the documentation of this file.

#ifndef _ASM_GENERIC_FCNTL_H
#define _ASM_GENERIC_FCNTL_H

#include <linux/types.h>

/*
 * FMODE_EXEC is 0x20
 * FMODE_NONOTIFY is 0x1000000
 * These cannot be used by userspace O_* until internal and external open
 * flags are split.
 * -Eric Paris
 */

/*
 * When introducing new O_* bits, please check its uniqueness in fcntl_init().
 */

#define O_ACCMODE   00000003
#define O_RDONLY    00000000
#define O_WRONLY    00000001
#define O_RDWR      00000002
#ifndef O_CREAT
#define O_CREAT     00000100    /* not fcntl */
#endif
#ifndef O_EXCL
#define O_EXCL      00000200    /* not fcntl */
#endif
#ifndef O_NOCTTY
#define O_NOCTTY    00000400    /* not fcntl */
#endif
#ifndef O_TRUNC
#define O_TRUNC     00001000    /* not fcntl */
#endif
#ifndef O_APPEND
#define O_APPEND    00002000
#endif
#ifndef O_NONBLOCK
#define O_NONBLOCK  00004000
#endif
#ifndef O_DSYNC
#define O_DSYNC     00010000    /* used to be O_SYNC, see below */
#endif
#ifndef FASYNC
#define FASYNC      00020000    /* fcntl, for BSD compatibility */
#endif
#ifndef O_DIRECT
#define O_DIRECT    00040000    /* direct disk access hint */
#endif
#ifndef O_LARGEFILE
#define O_LARGEFILE 00100000
#endif
#ifndef O_DIRECTORY
#define O_DIRECTORY 00200000    /* must be a directory */
#endif
#ifndef O_NOFOLLOW
#define O_NOFOLLOW  00400000    /* don't follow links */
#endif
#ifndef O_NOATIME
#define O_NOATIME   01000000
#endif
#ifndef O_CLOEXEC
#define O_CLOEXEC   02000000    /* set close_on_exec */
#endif

/*
 * Before Linux 2.6.33 only O_DSYNC semantics were implemented, but using
 * the O_SYNC flag.  We continue to use the existing numerical value
 * for O_DSYNC semantics now, but using the correct symbolic name for it.
 * This new value is used to request true Posix O_SYNC semantics.  It is
 * defined in this strange way to make sure applications compiled against
 * new headers get at least O_DSYNC semantics on older kernels.
 *
 * This has the nice side-effect that we can simply test for O_DSYNC
 * wherever we do not care if O_DSYNC or O_SYNC is used.
 *
 * Note: __O_SYNC must never be used directly.
 */
#ifndef O_SYNC
#define __O_SYNC    04000000
#define O_SYNC      (__O_SYNC|O_DSYNC)
#endif

#ifndef O_PATH
#define O_PATH      010000000
#endif

#ifndef O_NDELAY
#define O_NDELAY    O_NONBLOCK
#endif

#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 */
#ifndef F_GETLK
#define F_GETLK     5
#define F_SETLK     6
#define F_SETLKW    7
#endif
#ifndef F_SETOWN
#define F_SETOWN    8   /* for sockets. */
#define F_GETOWN    9   /* for sockets. */
#endif
#ifndef F_SETSIG
#define F_SETSIG    10  /* for sockets. */
#define F_GETSIG    11  /* for sockets. */
#endif

#ifndef CONFIG_64BIT
#ifndef F_GETLK64
#define F_GETLK64   12  /*  using 'struct flock64' */
#define F_SETLK64   13
#define F_SETLKW64  14
#endif
#endif

#ifndef F_SETOWN_EX
#define F_SETOWN_EX 15
#define F_GETOWN_EX 16
#endif

#ifndef F_GETOWNER_UIDS
#define F_GETOWNER_UIDS 17
#endif

#define F_OWNER_TID 0
#define F_OWNER_PID 1
#define F_OWNER_PGRP    2

struct f_owner_ex {
    int type;
    __kernel_pid_t  pid;
};

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

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

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

/* 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 */

#define F_LINUX_SPECIFIC_BASE   1024

#ifndef HAVE_ARCH_STRUCT_FLOCK
#ifndef __ARCH_FLOCK_PAD
#define __ARCH_FLOCK_PAD
#endif

struct flock {
    short   l_type;
    short   l_whence;
    __kernel_off_t  l_start;
    __kernel_off_t  l_len;
    __kernel_pid_t  l_pid;
    __ARCH_FLOCK_PAD
};
#endif

#ifndef CONFIG_64BIT

#ifndef HAVE_ARCH_STRUCT_FLOCK64
#ifndef __ARCH_FLOCK64_PAD
#define __ARCH_FLOCK64_PAD
#endif

struct flock64 {
    short  l_type;
    short  l_whence;
    __kernel_loff_t l_start;
    __kernel_loff_t l_len;
    __kernel_pid_t  l_pid;
    __ARCH_FLOCK64_PAD
};
#endif
#endif /* !CONFIG_64BIT */

#endif /* _ASM_GENERIC_FCNTL_H */