chfunc            195 ext/pty/pty.c      pid = rb_fork_async_signal_safe(&status, chfunc, &carg, Qnil, errbuf, sizeof(errbuf));
chfunc           3598 process.c                      ret = chfunc(charg, errmsg, errmsg_buflen);
chfunc           3629 process.c          pid = retry_fork_async_signal_safe(status, ep, chfunc, charg, errmsg, errmsg_buflen);
chfunc           4068 process.c          RETSIGTYPE (*chfunc)(int);
chfunc           4071 process.c          chfunc = signal(SIGCHLD, SIG_DFL);
chfunc           4083 process.c          signal(SIGCHLD, chfunc);