sigchain.hon commit commit: add short-circuit to paint_down_to_common() (d7c1ec3)
   1#ifndef SIGCHAIN_H
   2#define SIGCHAIN_H
   3
   4typedef void (*sigchain_fun)(int);
   5
   6int sigchain_push(int sig, sigchain_fun f);
   7int sigchain_pop(int sig);
   8
   9void sigchain_push_common(sigchain_fun f);
  10void sigchain_pop_common(void);
  11
  12#endif /* SIGCHAIN_H */