select.h File Reference

#include <sys/types.h>

Go to the source code of this file.

Classes
struct	_types_fd_set

Macros
#define	NBBY   8 /* number of bits in a byte */
#define	FD_SETSIZE   64
#define	NFDBITS   (sizeof (fd_mask) * NBBY) /* bits per mask */
#define	howmany(x, y)   (((x)+((y)-1))/(y))
#define	fd_set   _types_fd_set
#define	FD_SET(n, p)   ((p)->fds_bits[(n)/NFDBITS] |= (1L << ((n) % NFDBITS)))
#define	FD_CLR(n, p)   ((p)->fds_bits[(n)/NFDBITS] &= ~(1L << ((n) % NFDBITS)))
#define	FD_ISSET(n, p)   ((p)->fds_bits[(n)/NFDBITS] & (1L << ((n) % NFDBITS)))
#define	FD_ZERO(p)

Typedefs
typedef long	fd_mask

Functions
int	select (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout)
	POSIX select().

Detailed Description

Copyright

Copyright (c) 2015, Stuart W Baker All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

This file imlements POSIX select() prototypes.

Author

Stuart W. Baker

Date

26 January 2015

Definition in file freertos_select/sys/select.h.

Macro Definition Documentation

FD_CLR

#define FD_CLR	(		n,
			p
	)		((p)->fds_bits[(n)/NFDBITS] &= ~(1L << ((n) % NFDBITS)))

Definition at line 73 of file freertos_select/sys/select.h.

FD_ISSET

#define FD_ISSET	(		n,
			p
	)		((p)->fds_bits[(n)/NFDBITS] & (1L << ((n) % NFDBITS)))

Definition at line 74 of file freertos_select/sys/select.h.

fd_set

#define fd_set   _types_fd_set

Definition at line 70 of file freertos_select/sys/select.h.

FD_SET

#define FD_SET	(		n,
			p
	)		((p)->fds_bits[(n)/NFDBITS] |= (1L << ((n) % NFDBITS)))

Definition at line 72 of file freertos_select/sys/select.h.

FD_SETSIZE

#define FD_SETSIZE   64

Definition at line 55 of file freertos_select/sys/select.h.

FD_ZERO

#define FD_ZERO

(

p

)

Value:

     (__extension__ (void)({ \
     size_t __i; \
     char *__tmp = (char *)p; \
     for (__i = 0; __i < sizeof (*(p)); ++__i) \
       *__tmp++ = 0; \
}))

Definition at line 75 of file freertos_select/sys/select.h.

howmany

#define howmany	(		x,
			y
	)		(((x)+((y)-1))/(y))

Definition at line 61 of file freertos_select/sys/select.h.

NBBY

#define NBBY   8 /* number of bits in a byte */

Definition at line 47 of file freertos_select/sys/select.h.

NFDBITS

#define NFDBITS   (sizeof (fd_mask) * NBBY) /* bits per mask */

Definition at line 59 of file freertos_select/sys/select.h.

Typedef Documentation

fd_mask

typedef long fd_mask

Definition at line 58 of file freertos_select/sys/select.h.

Function Documentation

select()

int select	(	int	nfds,
		fd_set *	readfds,
		fd_set *	writefds,
		fd_set *	exceptfds,
		struct timeval *	timeout
	)

POSIX select().

Parameters

nfds	highest numbered file descriptor in any of the three, sets plus 1
readfds	fd_set of file descritpors to pend on read active
writefds	fd_set of file descritpors to pend on write active
exceptfds	fd_set of file descritpors to pend on error active
timeout	timeout value to wait, if 0, return immediately, if NULL wait forever

Returns

on success, number of file descriptors in the three sets that are active, 0 on timeout, -1 with errno set appropriately upon error.

Definition at line 473 of file Fileio.cxx.