/************************************************

  fcntl.c -

  $Author: akr $
  created at: Mon Apr  7 18:53:05 JST 1997

  Copyright (C) 1997-2001 Yukihiro Matsumoto

************************************************/

/************************************************
= NAME

fcntl - load the C fcntl.h defines

= SYNOPSIS

    require "fcntl"
    m = s.fcntl(Fcntl::F_GETFL, 0)
    f.fcntl(Fcntl::F_SETFL, Fcntl::O_NONBLOCK|m)

= DESCRIPTION

This module is just a translation of the C <fcntl.h> file.

= NOTE

Only #define symbols get translated; you must still correctly
pack up your own arguments to pass as args for locking functions, etc.

************************************************/

#include "ruby.h"
#include <fcntl.h>

/* Fcntl loads the constants defined in the system's <fcntl.h> C header
 * file, and used with both the fcntl(2) and open(2) POSIX system calls.
 *
 * Copyright (C) 1997-2001 Yukihiro Matsumoto
 *
 * Documented by mathew <meta@pobox.com>
 *
 * = Usage
 * 
 * To perform a fcntl(2) operation, use IO::fcntl in the core classes.
 *
 * To perform an open(2) operation, use IO::sysopen.
 *
 * The set of operations and constants available depends upon specific OS
 * platform. Some values listed below may not be supported on your system.
 *
 * The constants supported by Ruby for use with IO::fcntl are:
 *
 * - F_DUPFD - duplicate a close-on-exec file handle to a non-close-on-exec
 *   file handle.
 *
 * - F_GETFD - read the close-on-exec flag of a file handle.
 *
 * - F_SETFD - set the close-on-exec flag of a file handle.
 *
 * - FD_CLOEXEC - the value of the close-on-exec flag.
 *
 * - F_GETFL - get file descriptor flags.
 *
 * - F_SETFL - set file descriptor flags.
 *
 * - O_APPEND, O_NONBLOCK, etc (see below) - file descriptor flag
 *   values for the above.
 *
 * - F_GETLK - determine whether a given region of a file is locked.
 *
 * - F_SETLK - acquire a lock on a region of a file.
 *
 * - F_SETLKW - acquire a lock on a region of a file, waiting if necessary.
 *
 * - F_RDLCK, F_WRLCK, F_UNLCK - types of lock for the above.
 *
 * The constants supported by Ruby for use with IO::sysopen are:
 *
 * - O_APPEND - open file in append mode.
 *
 * - O_NOCTTY - open tty without it becoming controlling tty.
 *
 * - O_CREAT - create file if it doesn't exist.
 *
 * - O_EXCL - used with O_CREAT, fail if file exists.
 *
 * - O_TRUNC - truncate file on open.
 *
 * - O_NONBLOCK / O_NDELAY - open in non-blocking mode.
 *
 * - O_RDONLY - open read-only.
 *
 * - O_WRONLY - open write-only.
 *
 * - O_RDWR - open read-write.
 *
 * - O_ACCMODE - mask to extract read/write flags.
 *
 * Example:
 * 
 *   require 'fcntl'
 *
 *   fd = IO::sysopen('/tmp/tempfile', 
 *        Fcntl::O_WRONLY | Fcntl::O_EXCL | Fcntl::O_CREAT)
 *   f = IO.open(fd)
 *   f.syswrite("TEMP DATA")
 *   f.close
 *
 */
void
Init_fcntl()
{
    VALUE mFcntl = rb_define_module("Fcntl");
#ifdef F_DUPFD
    rb_define_const(mFcntl, "F_DUPFD", INT2NUM(F_DUPFD));
#endif
#ifdef F_GETFD
    rb_define_const(mFcntl, "F_GETFD", INT2NUM(F_GETFD));
#endif
#ifdef F_GETLK
    rb_define_const(mFcntl, "F_GETLK", INT2NUM(F_GETLK));
#endif
#ifdef F_SETFD
    rb_define_const(mFcntl, "F_SETFD", INT2NUM(F_SETFD));
#endif
#ifdef F_GETFL
    rb_define_const(mFcntl, "F_GETFL", INT2NUM(F_GETFL));
#endif
#ifdef F_SETFL
    rb_define_const(mFcntl, "F_SETFL", INT2NUM(F_SETFL));
#endif
#ifdef F_SETLK
    rb_define_const(mFcntl, "F_SETLK", INT2NUM(F_SETLK));
#endif
#ifdef F_SETLKW
    rb_define_const(mFcntl, "F_SETLKW", INT2NUM(F_SETLKW));
#endif
#ifdef FD_CLOEXEC
    rb_define_const(mFcntl, "FD_CLOEXEC", INT2NUM(FD_CLOEXEC));
#endif
#ifdef F_RDLCK
    rb_define_const(mFcntl, "F_RDLCK", INT2NUM(F_RDLCK));
#endif
#ifdef F_UNLCK
    rb_define_const(mFcntl, "F_UNLCK", INT2NUM(F_UNLCK));
#endif
#ifdef F_WRLCK
    rb_define_const(mFcntl, "F_WRLCK", INT2NUM(F_WRLCK));
#endif
#ifdef O_CREAT
    rb_define_const(mFcntl, "O_CREAT", INT2NUM(O_CREAT));
#endif
#ifdef O_EXCL
    rb_define_const(mFcntl, "O_EXCL", INT2NUM(O_EXCL));
#endif
#ifdef O_NOCTTY
    rb_define_const(mFcntl, "O_NOCTTY", INT2NUM(O_NOCTTY));
#endif
#ifdef O_TRUNC
    rb_define_const(mFcntl, "O_TRUNC", INT2NUM(O_TRUNC));
#endif
#ifdef O_APPEND
    rb_define_const(mFcntl, "O_APPEND", INT2NUM(O_APPEND));
#endif
#ifdef O_NONBLOCK
    rb_define_const(mFcntl, "O_NONBLOCK", INT2NUM(O_NONBLOCK));
#endif
#ifdef O_NDELAY
    rb_define_const(mFcntl, "O_NDELAY", INT2NUM(O_NDELAY));
#endif
#ifdef O_RDONLY
    rb_define_const(mFcntl, "O_RDONLY", INT2NUM(O_RDONLY));
#endif
#ifdef O_RDWR
    rb_define_const(mFcntl, "O_RDWR", INT2NUM(O_RDWR));
#endif
#ifdef O_WRONLY
    rb_define_const(mFcntl, "O_WRONLY", INT2NUM(O_WRONLY));
#endif
#ifdef O_ACCMODE
    rb_define_const(mFcntl, "O_ACCMODE", INT2FIX(O_ACCMODE));
#else
    rb_define_const(mFcntl, "O_ACCMODE", INT2FIX(O_RDONLY | O_WRONLY | O_RDWR));
#endif
}
