git.distorted.org.uk Git - u/mdw/putty/blob - unix/signal.c

   1 #include <signal.h>
   2
   3 /*
   4  * Calling signal() is a non-portable, as it varies in meaning between
   5  * platforms and depending on feature macros, and has stupid semantics
   6  * at least some of the time.
   7  *
   8  * This function provides the same interface as the libc function, but
   9  * provides consistent semantics.  It assumes POSIX semantics for
  10  * sigaction() (so you might need to do some more work if you port to
  11  * something ancient like SunOS 4)
  12  */
  13 void (*putty_signal(int sig, void (*func)(int)))(int) {
  14     struct sigaction sa;
  15     struct sigaction old;
  16
  17     sa.sa_handler = func;
  18     if(sigemptyset(&sa.sa_mask) < 0)
  19         return SIG_ERR;
  20     sa.sa_flags = SA_RESTART;
  21     if(sigaction(sig, &sa, &old) < 0)
  22         return SIG_ERR;
  23     return old.sa_handler;
  24 }
  25
  26 /*
  27 Local Variables:
  28 c-basic-offset:4
  29 comment-column:40
  30 End:
  31 */