🚀 go-pugleaf

kwang@zeus.calpoly.edu (Kevin Wang aka The Scarecrow) writes:
: 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:
: [.....]


After your fcntl() call to make the socket Async, you need
another call: 

		fcntl (sock, F_SETOWN, getpid());

This will allow your pid (or group; see fcntl(2)) to receive SIGIO.  
-- 
Joe Palumbos	jmp@moscom.com		{rit,tropix,ur-valhalla}!moscom!jmp