Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!ucsd!ames!haven!adm!news
From: TAYBENGH%NUSDISCS.BITNET@cunyvm.cuny.edu
Newsgroups: comp.unix.wizards
Subject: HELP! BSD select() on socket (WIN/TCP for VMS)
Message-ID: <22789@adm.BRL.MIL>
Date: 19 Mar 90 07:51:20 GMT
Sender: news@adm.BRL.MIL
Lines: 29


        Recently I have a problem of using the select() system call in WIN/TCP
for VMS Release 3.2. According to the manuals provided by Wollongong, the
select() takes in NULL pointer for writefds/exceptfds, but I always encounter
access violation run-time error when I tried to call

        select(n, readfds, 0, 0, &timeout);

Moreover, select() supposed to block or return depend on the timeval (timeout)
passed in, but it always return immediately no matter what timeout value I
gives without setting any fle descriptors (channels). For example,

        timeout.tv_sec = 10000;
        FD_ZERO(&ready);
        FD_ZERO(&write);
        FD_ZERO(&except);
        FD_SET(sock, &ready);
        FD_SET(sock, &write);
        FD_SET(sock, &except);
        /*
         * Null pointer is not working, giving acess violation problems!
         */
        if (nfd = (select(sock+1, &ready, &write, &except, &timeout)) <0)
           perror("select");

        Anybody out there knows the solution, please help...
        Thanks.

-Beng Hang (taybengh@nusdiscs.bitnet)