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include
sys
select.h
Go to the documentation of this file.
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/* KallistiOS ##version##
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sys/select.h
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Copyright (C) 2012 Lawrence Sebald
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*/
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/** \file select.h
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\brief Definitions for the select() function.
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This file contains the definitions needed for using the select() function,
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as directed by the POSIX 2008 standard (aka The Open Group Base
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Specifications Issue 7). Currently the functionality defined herein only
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really works for sockets, and that is likely how it will stay for some time.
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\author Lawrence Sebald
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*/
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#ifndef __SYS_SELECT_H
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#define __SYS_SELECT_H
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#include <sys/cdefs.h>
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#include <sys/types.h>
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__BEGIN_DECLS
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#include <time.h>
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#include <sys/time.h>
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/* <sys/types.h> defines fd_set and friends for us, so there's really not much
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that we have to do here... */
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/** \brief Wait for activity on a group of file descriptors.
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This function will check the specfied group of file descriptors for activity
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and wait for activity (up to the timeout specified) if there is not any
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pending events already.
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\param nfds The maximum fd specified in any of the sets, plus 1.
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\param readfds File descriptors to check for the ability to read
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without blocking.
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\param writefds File descriptors to check for the ability to write
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without blocking.
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\param errorfds File descriptors to check for error/exceptional
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conditions.
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\param timeout Maximum amount of time to block. Passing a 0 timeout
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will make the funciton not block, Passing NULL here will
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make the function block indefinitely.
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\return -1 on error (sets errno as appropriate), or the number
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of bits set in the fd sets on success (this may be 0 if
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the timeout expires).
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*/
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int
select
(
int
nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds,
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struct
timeval *timeout);
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__END_DECLS
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#endif
/* !__SYS_SELECT_H */
select
int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *timeout)
Wait for activity on a group of file descriptors.
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