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

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

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 descriptors.

       If  implemented as macros, these may evaluate their arguments more than
       once, so applications 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 <signal.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 original 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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