glibc/sysdeps/nacl/bits/fcntl.h

/* O_*, F_*, FD_* bit values.  NaCl version.
   Copyright (C) 2015-2017 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _FCNTL_H
#error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
#endif


/* File access modes for `open' and `fcntl'.  */
#define O_RDONLY        0       /* Open read-only.  */
#define O_WRONLY        1       /* Open write-only.  */
#define O_RDWR          2       /* Open read/write.  */


/* Bits OR'd into the second argument to open.  */
#define O_CREAT         00100   /* Create file if it doesn't exist.  */
#define O_EXCL          00200   /* Fail if file already exists.  */
#define O_TRUNC         01000   /* Truncate file to zero length.  */
#define O_NOCTTY        0       /* Don't assign a controlling terminal.  */
#define O_ASYNC         020000  /* Send SIGIO to owner when data is ready.  */
#define O_FSYNC         010000  /* Synchronous writes.  */
#define O_SYNC          O_FSYNC
#ifdef __USE_XOPEN2K8
# define O_DIRECTORY    00200000        /* Must be a directory.  */
# define O_NOFOLLOW     00400000        /* Do not follow links.  */
# define O_CLOEXEC      02000000        /* Set close_on_exec.  */
#endif
#if defined __USE_POSIX199309 || defined __USE_UNIX98
# define O_DSYNC        O_SYNC          /* Synchronize data.  */
# define O_RSYNC        O_SYNC          /* Synchronize read operations.  */
#endif

/* All opens support large file sizes, so there is no flag bit for this.  */
#ifdef __USE_LARGEFILE64
# define O_LARGEFILE    0
#endif

/* File status flags for `open' and `fcntl'.  */
#define O_APPEND        02000   /* Writes append to the file.  */
#define O_NONBLOCK      04000   /* Non-blocking I/O.  */

#ifdef __USE_MISC
# define O_NDELAY       O_NONBLOCK
#endif

#ifdef __USE_MISC
/* Bits in the file status flags returned by F_GETFL.
   These are all the O_* flags, plus FREAD and FWRITE, which are
   independent bits set by which of O_RDONLY, O_WRONLY, and O_RDWR, was
   given to `open'.  */
# define FREAD          1
# define FWRITE         2

/* Traditional BSD names the O_* bits.  */
# define FASYNC         O_ASYNC
# define FFSYNC         O_FSYNC
# define FSYNC          O_SYNC
# define FAPPEND        O_APPEND
# define FNDELAY        O_NDELAY
#endif

/* Mask for file access modes.  This is system-dependent in case
   some system ever wants to define some other flavor of access.  */
#define O_ACCMODE       (O_RDONLY|O_WRONLY|O_RDWR)

/* Values for the second argument to `fcntl'.  */
#define F_DUPFD         0       /* Duplicate file descriptor.  */
#define F_GETFD         1       /* Get file descriptor flags.  */
#define F_SETFD         2       /* Set file descriptor flags.  */
#define F_GETFL         3       /* Get file status flags.  */
#define F_SETFL         4       /* Set file status flags.  */
#if defined __USE_UNIX98 || defined __USE_XOPEN2K8
#define F_GETOWN        5       /* Get owner (receiver of SIGIO).  */
#define F_SETOWN        6       /* Set owner (receiver of SIGIO).  */
#endif
#define F_GETLK         7       /* Get record locking info.  */
#define F_SETLK         8       /* Set record locking info (non-blocking).  */
#define F_SETLKW        9       /* Set record locking info (blocking).  */
/* Not necessary, we always have 64-bit offsets.  */
#define F_GETLK64       F_GETLK /* Get record locking info.  */
#define F_SETLK64       F_SETLK /* Set record locking info (non-blocking).  */
#define F_SETLKW64      F_SETLKW/* Set record locking info (blocking).  */
#ifdef __USE_XOPEN2K8
# define F_DUPFD_CLOEXEC 12     /* Duplicate file descriptor with
                                   close-on-exec set.  */
#endif

/* File descriptor flags used with F_GETFD and F_SETFD.  */
#define FD_CLOEXEC      1       /* Close on exec.  */


#include <bits/types.h>

/* The structure describing an advisory lock.  This is the type of the third
   argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests.  */
struct flock
  {
    short int l_type;   /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
    short int l_whence; /* Where `l_start' is relative to (like `lseek').  */
    __off_t l_start;    /* Offset where the lock begins.  */
    __off_t l_len;      /* Size of the locked area; zero means until EOF.  */
    __pid_t l_pid;      /* Process holding the lock.  */
  };

#ifdef __USE_LARGEFILE64
/* Note this matches struct flock exactly.  */
struct flock64
  {
    short int l_type;   /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
    short int l_whence; /* Where `l_start' is relative to (like `lseek').  */
    __off_t l_start;    /* Offset where the lock begins.  */
    __off_t l_len;      /* Size of the locked area; zero means until EOF.  */
    __pid_t l_pid;      /* Process holding the lock.  */
  };
#endif

/* Values for the `l_type' field of a `struct flock'.  */
#define F_RDLCK 1       /* Read lock.  */
#define F_WRLCK 2       /* Write lock.  */
#define F_UNLCK 3       /* Remove lock.  */

/* Advice to `posix_fadvise'.  */
#ifdef __USE_XOPEN2K
# define POSIX_FADV_NORMAL      0 /* No further special treatment.  */
# define POSIX_FADV_RANDOM      1 /* Expect random page references.  */
# define POSIX_FADV_SEQUENTIAL  2 /* Expect sequential page references.  */
# define POSIX_FADV_WILLNEED    3 /* Will need these pages.  */
# define POSIX_FADV_DONTNEED    4 /* Don't need these pages.  */
# define POSIX_FADV_NOREUSE     5 /* Data will be accessed once.  */
#endif