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Linux 2.6 - man page for sys_select.h (linux section 7posix)

<sys/select.h>(P)		    POSIX Programmer's Manual			<sys/select.h>(P)

NAME
       sys/select.h - select types

SYNOPSIS
       #include <sys/select.h>

DESCRIPTION
       The  <sys/select.h>  header  shall define the timeval structure that includes at least the
       following members:

	      time_t	     tv_sec	 Seconds.
	      suseconds_t    tv_usec	 Microseconds.

       The time_t and suseconds_t types shall be defined as described in <sys/types.h> .

       The sigset_t type shall be defined as described in <signal.h> .

       The timespec structure shall be defined as described in <time.h> .

       The <sys/select.h> header shall define the fd_set type as a structure.

       Each of the following may be declared as a function, or defined as a macro, or both:

       void FD_CLR(int fd, fd_set *fdset)

	      Clears the bit for the file descriptor fd in the file descriptor set fdset.

       int FD_ISSET(int fd, fd_set *fdset)

	      Returns a non-zero value if the bit for the file descriptor fd is set in	the  file
	      descriptor set by fdset, and 0 otherwise.

       void FD_SET(int fd, fd_set *fdset)

	      Sets the bit for the file descriptor fd in the file descriptor set fdset.

       void FD_ZERO(fd_set *fdset)

	      Initializes  the	file descriptor set fdset to have zero bits for all file descrip-
	      tors.

       If implemented as macros, these may evaluate their arguments more than once,  so  applica-
       tions  should  ensure  that  the  arguments  they  supply  are never expressions with side
       effects.

       The following shall be defined as a macro:

       FD_SETSIZE

	      Maximum number of file descriptors in an fd_set structure.

       The following shall be declared as functions and may also be defined as	macros.  Function
       prototypes shall be provided.

	      int  pselect(int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
		       const struct timespec *restrict, const sigset_t *restrict);
	      int  select(int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
		       struct timeval *restrict);

       Inclusion of the <sys/select.h> header may make visible all symbols from the headers <sig-
       nal.h>, <sys/time.h>, and <time.h>.

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <signal.h> , <sys/time.h> , <sys/types.h> , <time.h> , the  System  Interfaces  volume  of
       IEEE Std 1003.1-2001, pselect(), select()

COPYRIGHT
       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				<sys/select.h>(P)


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