rb_waitpid       146 ext/pty/pty.c      cpid = rb_waitpid(info->child_pid, &status, WUNTRACED);
rb_waitpid       352 process.c          if ((pid = rb_waitpid(pid, &status, flags)) < 0)
rb_waitpid       400 process.c      	pid = rb_waitpid(-1, &status, 0);
rb_waitpid       789 process.c      	i = rb_waitpid(pid, &status, 0);