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/* `fd_set' type and related macros, and `select'/`pselect' declarations.

   Copyright (C) 1996,1997,1998,1999,2000,2001 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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

/*      POSIX 1003.1g: 6.2 Select from File Descriptor Sets <sys/select.h>  */

#ifndef _SYS_SELECT_H

#define _SYS_SELECT_H   1

#include <features.h>

/* Get definition of needed basic types.  */

#include <bits/types.h>

/* Get __FD_* definitions.  */

#include <bits/select.h>

/* Get __sigset_t.  */

#include <bits/sigset.h>

#ifndef __sigset_t_defined

# define __sigset_t_defined

typedef __sigset_t sigset_t;

#endif

/* Get definition of timer specification structures.  */

#define __need_timespec

#include <time.h>

#define __need_timeval

#include <bits/time.h>

/* The fd_set member is required to be an array of longs.  */

typedef long int __fd_mask;

/* It's easier to assume 8-bit bytes than to get CHAR_BIT.  */

#define __NFDBITS       (8 * sizeof (__fd_mask))

#define __FDELT(d)      ((d) / __NFDBITS)

#define __FDMASK(d)     ((__fd_mask) 1 << ((d) % __NFDBITS))

/* fd_set for select and pselect.  */

typedef struct

  {

    /* XPG4.2 requires this member name.  Otherwise avoid the name

       from the global namespace.  */

#ifdef __USE_XOPEN

    __fd_mask fds_bits[__FD_SETSIZE / __NFDBITS];

# define __FDS_BITS(set) ((set)->fds_bits)

#else

    __fd_mask __fds_bits[__FD_SETSIZE / __NFDBITS];

# define __FDS_BITS(set) ((set)->__fds_bits)

#endif

  } fd_set;

/* Maximum number of file descriptors in `fd_set'.  */

#define FD_SETSIZE              __FD_SETSIZE

#ifdef __USE_MISC

/* Sometimes the fd_set member is assumed to have this type.  */

typedef __fd_mask fd_mask;

/* Number of bits per word of `fd_set' (some code assumes this is 32).  */

# define NFDBITS                __NFDBITS

#endif

/* Access macros for `fd_set'.  */

#define FD_SET(fd, fdsetp)      __FD_SET (fd, fdsetp)

#define FD_CLR(fd, fdsetp)      __FD_CLR (fd, fdsetp)

#define FD_ISSET(fd, fdsetp)    __FD_ISSET (fd, fdsetp)

#define FD_ZERO(fdsetp)         __FD_ZERO (fdsetp)

__BEGIN_DECLS

/* Check the first NFDS descriptors each in READFDS (if not NULL) for read

   readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS

   (if not NULL) for exceptional conditions.  If TIMEOUT is not NULL, time out

   after waiting the interval specified therein.  Returns the number of ready

   descriptors, or -1 for errors.  */

extern int select (int __nfds, fd_set *__restrict __readfds,

                   fd_set *__restrict __writefds,

                   fd_set *__restrict __exceptfds,

                   struct timeval *__restrict __timeout) __THROW;

#ifdef __USE_XOPEN2K

/* Same as above only that the TIMEOUT value is given with higher

   resolution and a sigmask which is been set temporarily.  This version

   should be used.  */

extern int pselect (int __nfds, fd_set *__restrict __readfds,

                    fd_set *__restrict __writefds,

                    fd_set *__restrict __exceptfds,

                    const struct timespec *__restrict __timeout,

                    const __sigset_t *__restrict __sigmask) __THROW;

#endif

__END_DECLS

#endif /* sys/select.h */