select function


 
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Old 06-10-2008
Question select function

Dear all,
I am using select function for the socket programming. What is the purpose of except fd's fd set in the argument.
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explain_select_or_die(3)				     Library Functions Manual					  explain_select_or_die(3)

NAME
explain_select_or_die - blah blah and report errors SYNOPSIS
#include <libexplain/select.h> void explain_select_or_die(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout); DESCRIPTION
The explain_select_or_die function is used to call the select(2) system call. On failure an explanation will be printed to stderr, obtained from explain_select(3), and then the process terminates by calling exit(EXIT_FAILURE). This function is intended to be used in a fashion similar to the following example: explain_select_or_die(nfds, readfds, writefds, exceptfds, timeout); nfds The nfds, exactly as to be passed to the select(2) system call. readfds The readfds, exactly as to be passed to the select(2) system call. writefds The writefds, exactly as to be passed to the select(2) system call. exceptfds The exceptfds, exactly as to be passed to the select(2) system call. timeout The timeout, exactly as to be passed to the select(2) system call. Returns: This function only returns on success. On failure, prints an explanation and exits. SEE ALSO
select(2) blah blah explain_select(3) explain select(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2008 Peter Miller explain_select_or_die(3)