int parent_main(pid_t child_pid) {
int kq;
int status;
sigset_t sigs;
if (sigfillset(&sigs) == -1) { ERRMSG("sigfillset() failed"); goto kill_child; }
if (sigprocmask(SIG_SETMASK, &sigs, NULL) == -1) { ERRMSG("sigprocmask() failed"); goto kill_child; }
if ((kq = kqueue()) == -1) { ERRMSG("kqueue() failed"); goto kill_child; }
if (poll_add(kq, STDIN_FILENO, EVFILT_READ) == -1) { ERRMSG("poll_add() failed"); goto kill_child; }
for (;;) {
int i;
enum HANDLE_RESULT handle_ret = IGNORE;
struct kevent e[2];
struct timespec timeout;
timeout.tv_sec = 0;
timeout.tv_nsec = 100 * 1000 * 1000; // 100ms
int nfd = kevent(kq, NULL, 0, e, sizeof(e) / sizeof(struct kevent), &timeout);
if (nfd == -1) { ERRMSG("kevent() failed"); goto kill_child; }
if (nfd == 0) {
int ret = waitpid(child_pid, &status, WNOHANG);
if (ret == -1) { ERRMSG("waitpid() failed"); goto kill_child; }
if (ret != 0) { goto child_exited; }
if (sigpending(&sigs) == -1) { ERRMSG("sigpending() failed"); goto kill_child; }
handle_ret = handle_signal(&sigs, child_pid);
}
for (i = 0; i < nfd; i++) {
int fd = e[i].ident;
if (fd == STDIN_FILENO) {
if (e[i].flags & EV_EOF) {
handle_ret = handle_in_eof(fd, child_pid);
}
}
}
switch(handle_ret) {
case KILL_CHILD: goto kill_child;
case WAIT_CHILD_EXIT: goto wait_child_exit;
case IGNORE: break;
}
}
kill_child:
if (kill(child_pid, SIGKILL) == -1) { ERR_EXIT("kill() failed"); }
wait_child_exit:
if (waitpid(child_pid, &status, 0) == -1) { ERR_EXIT("waitpid() failed"); }
child_exited:
if (WIFEXITED(status)) { return WEXITSTATUS(status); }
if (WIFSIGNALED(status)) { return WTERMSIG(status) + 128; }
return 1;
}
int parent_main(pid_t child_pid) {
int epfd;
int sigfd;
int status;
sigset_t sigs;
if (sigfillset(&sigs) == -1) { ERRMSG("sigfillset() failed"); goto kill_child; }
if (sigprocmask(SIG_SETMASK, &sigs, NULL) == -1) { ERRMSG("sigprocmask() failed"); goto kill_child; }
if ((sigfd = signalfd(-1, &sigs, SFD_NONBLOCK)) == -1) { ERRMSG("signalfd() failed"); goto kill_child; }
if ((epfd = epoll_create(1)) == -1) { ERRMSG("epoll_create() failed"); goto kill_child; }
if (epoll_add(epfd, sigfd, EPOLLIN) == -1) { ERRMSG("epoll_add() failed"); goto kill_child; }
if (epoll_add(epfd, STDIN_FILENO, 0) == -1) { ERRMSG("epoll_add() failed"); goto kill_child; }
for (;;) {
int i;
enum HANDLE_RESULT handle_ret;
struct epoll_event e[3];
int nfd = epoll_wait(epfd, e, sizeof(e) / sizeof(struct epoll_event), 100);
if (nfd == -1) { ERRMSG("epoll_wait() failed"); goto kill_child; }
if (nfd == 0) {
int ret = waitpid(child_pid, &status, WNOHANG);
if (ret == -1) { ERRMSG("waitpid() failed"); goto kill_child; }
if (ret != 0) { goto child_exited; }
continue;
}
for (i = 0; i < nfd; i++) {
int fd = e[i].data.fd;
if (fd == sigfd) { handle_ret = handle_signal(fd, child_pid); }
else { handle_ret = handle_in_eof(fd, child_pid); }
switch(handle_ret) {
case KILL_CHILD: goto kill_child;
case WAIT_CHILD_EXIT: goto wait_child_exit;
}
}
}
kill_child:
if (kill(child_pid, SIGKILL) == -1) { ERR_EXIT("kill() failed"); }
wait_child_exit:
if (waitpid(child_pid, &status, 0) == -1) { ERR_EXIT("waitpid() failed"); }
child_exited:
if (WIFEXITED(status)) { return WEXITSTATUS(status); }
if (WIFSIGNALED(status)) { return WTERMSIG(status) + 128; }
return 1;
}