🚀 go-pugleaf

In <100320@bu.edu> tasos@cs.bu.edu (Anastasios Kotsikonas) writes:

>I am trying to write a client that does async socket I/O but I cannot grab the
>SIGIO signal:
>but I never get it; I only have this problem on certain SVR3 systems (SGI's
>system works as expected).

You have to tell us more. Especially what version of UNIX you're
trying this on and what your code looks like.

All that can be said now is that certain (in fact most) SVR3 systems
don't support SIGIO. 

-- 
				Christoph Badura  ---  bad@flatlin.ka.sub.org

AIX is a better... is a better...  is a better... OpenSystem.
					IBM Rep at GUUG Symposium '92

In article <Bx5yE7.DDn@flatlin.ka.sub.org> bad@flatlin.ka.sub.org (Christoph Badura) writes:
>In <100320@bu.edu> tasos@cs.bu.edu (Anastasios Kotsikonas) writes:
>
>>I am trying to write a client that does async socket I/O but I cannot grab the
>>SIGIO signal:
>>but I never get it; I only have this problem on certain SVR3 systems (SGI's
>>system works as expected).
>
>You have to tell us more. Especially what version of UNIX you're
>trying this on and what your code looks like.
>
>All that can be said now is that certain (in fact most) SVR3 systems
>don't support SIGIO. 

Here are excerpts of the code:

First catch the signals:

  signal (SIGIO, (void (*)()) urg_data);
  signal (SIGURG, (void (*)()) urg_data);

then once I have the socket:

#ifdef sco
  if (ioctl (sock_fd, I_SETSIG, S_INPUT) < 0) {
    perror ("Cannot set SIGIO");
    return -1;
  }
#else
# ifdef F_SETOWN
  if (fcntl (sock_fd, F_SETOWN, getpid()) < 0) {
    perror ("Cannot assign socket to process group");
    return -1;
  }
# elif defined (SIOCSPGRP)
  value = -getpid();
  if (ioctl (sock_fd, SIOCSPGRP, (char *) &value) < 0) {
    perror ("Cannot assign socket to process group");
    return -1;
  }
# else
  perror ("Cannot assign socket to process group");
  return -1;
# endif
# ifdef FASYNC
  if (fcntl (sock_fd, F_SETFL, (fcntl (sock_fd, F_GETFL, 0) | FASYNC)) < 0) {
    perror ("Cannot set asynchronous I/O for socket");
    return -1;
  }
# elif defined (FIOASYNC)
  value = 1;
  if (ioctl (sock_fd, FIOASYNC, (char *) &value) < 0) {
    perror ("Cannot set asynchronous I/O for socket");
    return -1;
  }
# else
  perror ("Cannot set asynchronous I/O for socket");
  return -1;
# endif
#endif
  return sock_fd;


Any help will be greatly appreciated.

Tasos

PS: and BTW, I disagree with your .signature: AIX is the worst UNIX I have