sigchain.hon commit wrapper: move is_empty_file() and rename it as is_empty_or_missing_file() (e3b1e3b)
   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 */