lib/bsdsignal.c

   1 /*
   2  * bsdsignal.c
   3  *
   4  * Use sigaction() to simulate BSD signal()
   5  */
   6
   7 #include <signal.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10
  11 void (*bsd_signal(int, void (*)(int)))(int);
  12
  13 void (*bsd_signal(int signum, void (*handler)(int)))(int)
  14 {
  15   struct sigaction action, oldaction;
  16
  17   memset(&action, 0, sizeof action);
  18   action.sa_handler = handler;
  19   sigemptyset(&action.sa_mask);
  20   sigaddset(&action.sa_mask, signum);
  21   action.sa_flags = SA_RESTART;
  22
  23   if (sigaction(signum, &action, &oldaction) == -1) {
  24 #ifdef SIG_ERR
  25     return SIG_ERR;
  26 #else
  27     return NULL;
  28 #endif
  29   }
  30
  31   return oldaction.sa_handler;
  32 }