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SELECT(2)							     SELECT(2)

NAME
       select,	FD_CLR, FD_ISSET, FD_SET, FD_ZERO - synchronous I/O multiplex‐
       ing

SYNOPSIS
       #include <sys/select.h>

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

       void FD_CLR(int fd, fd_set *fdset)
       int FD_ISSET(int fd, fd_set *fdset)
       void FD_SET(int fd, fd_set *fdset)
       void FD_ZERO(fd_set *fdset)

DESCRIPTION
       Select examines	the  file  descriptors	given  in  the	sets  readfds,
       writefds,  and  errorfds,  up to and including file descriptor nfds-1 ,
       for reading, writing, or exceptional conditions, respectively.	Select
       currently  supports  regular  files,  pipes, named pipes, inet, and tty
       file descriptors (including pty).

       If the readfds argument is not a null pointer, it points to  an	object
       of  type	 fd_set	 that  on  input  specifies the file descriptors to be
       checked for being ready to read, and on	output	indicates  which  file
       descriptors are ready to read.  Writefds and errorfds have an analogous
       meaning for file descriptors to be checked for  being  ready  to	 read,
       respectively have pending exceptional (error) conditions.

4th Berkeley Distribution	  Jun 9, 2005			     SELECT(2)
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