Second signal call in sighandler - what for?

Question

Recently I found some code which uses signal:

  286 static void sighandler( int signum )
  287 {   
  288     alarmed = 1;
  289     signal( signum,         


        

Answer 1

There are systems where, if signal() is called with a function, the signal handler is reset to default after the first signal is caught (I haven't found out on the fly if it's defined to be so). That's the reason why signal() is called again in the signal handler.