🚀 go-pugleaf

I am trying to use fcntl() to turn on O_ASYNC so that my program
will receive a SIGIO when any data comes in across any of its sockets.
However, it doesn't seem to be working.

system is AIX (yes, yes, I know) V 1.2.1

Here's how I turn it on:
 void SIGIO_ON(int sock)
{
    int hold;

    hold = fcntl(sock, F_GETFL, 0);
    hold = fcntl(sock, F_SETFL, hold | O_ASYNC);
    if (-1 == hold)
        {
        perror("SIGIO_ON");
        }
    return;
}


and here's the code that's supposed to be interrupted by the SIGIO:
        wakeupcall = FALSE;
        signal(SIGALRM, AlarmHandler);
        signal(SIGIO, AlarmHandler);
        alarm(30);  /* wake me up in 30 seconds */
        loop = AcceptConnect(sock, addr, addrlen);
        errsave = errno;
        signal(SIGIO, SIG_IGN);
        signal(SIGALRM, SIG_IGN);  /* ignore alarms */
        alarm(0);  /* cancel alarm */

all that AlarmHandler does is sets wakeupcall, a global int to TRUE,
so that I know a signal occurred.

inside of AcceptConnect lies the accept() for sockets.  the man pages
says it will return -1 if interrupted by a signal.  why isn't it being
interrupted?

   - Kevin Wang 
...And now, for your local station identification, on the hour, every hour...
kwang@hermes.calpoly.edu or kwang@gauss.elee.calpoly.edu
---
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