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-.TH SELECT 2
-.CT 2 file_io comm_proc
-.SH NAME
-select \(mi synchronous input/output multiplexing
-.SH SYNOPSIS
-.nf
-.B #include <sys/types.h>
-.PP
-.B int select(nfds, readfds, writefds, milli);
-.B fd_set *readfds, *writefds;
-.fi
-.SH DESCRIPTION
-.I Select
-examines a set of file descriptors
-to see if they will block if read or written.
-.I Readfds
-points to an object of type
-.BR fd_set ,
-which contains a set of descriptors to be checked for reading;
-.I writefds
-similarly for writing.
-Only descriptors
-0 through
-.IR nfds \-1
-are considered.
-The number of ready descriptors is returned,
-and the
-.B fd_set
-pointed to by
-.I readfds
-.RI ( writefds )
-is overwritten with a set of descriptors
-ready to be read
-(written).
-The call waits until at least one descriptor is ready,
-or until
-.I milli
-milliseconds have passed.
-.PP
-Either
-.I readfds
-or
-.I writefds
-may be 0
-if no descriptors are interesting.
-.PP
-The
-.BR fd_set
-type looks like
-.RS
-.EX
-typedef struct {
-	unsigned int fds_bits[FDWORDS];
-} fd_set;
-.EE
-.RE
-.B FDWORDS
-is sufficient to contain as many file descriptors as the system will allow
-(currently 128).
-If there are
-.I B
-bits in an
-.BR "unsigned int" ,
-file descriptor
-.I n
-is represented by
-.BI "1<<((" n % B )-1)
-in word
-.BI fds_bits[ n / B ]\c
-\&.
-.PP
-These macros should be used
-to manipulate the contents
-of an
-.BR fd_set :
-.TF FD_ISSET(n,\0s)
-.TP
-.PD 0
-.B FD_ZERO(s)
-clear all bits
-in set
-.I s
-.TP
-.B "FD_SET(n, s)
-set bit for file descriptor
-.I n
-in set
-.I s
-.TP
-.B "FD_CLR(n, s)
-clear bit for file descriptor
-.I n
-in s
-.TP
-.B "FD_ISSET(n, s)
-return a value of 1
-if bit for file descriptor
-.I n
-is set in
-.IR s ,
-0 otherwise
-.PD
-.SH EXAMPLES
-.EX
-int p[2];
-fd_set wfs;
-pipe(p);
-do {
-	FD_SET(p[1], wfs);
-	write(p[1], ".", 1);
-	i++;
-} while(select(p[1]+1, (fd_set*)0, wfs, 0) == 1);
-printf("Pipe capacity = %d\en", i);
-.EE
-.SH "SEE ALSO"
-.IR read (2)
-.SH DIAGNOSTICS
-.BR EBADF ,
-.BR EFAULT ,
-.BR EINTR
-.SH BUGS
-.I Milli
-is rounded up to the nearest second.
-.br
-.I Select
-is intended for use with streams;
-file descriptors referring to ordinary files
-or to non-stream special files
-always appear ready.
-This is a lie for some special files.