inline void courtesy_yield(void) {
if (0 == epoll_wait(ribs_epoll_fd, &last_epollev, 1, 0))
return;
queue_current_ctx();
ribs_swapcurcontext(epoll_worker_get_last_context());
}
static void _handle_sig_child(void) {
struct signalfd_siginfo sfd_info;
for (;;yield()) {
for (;;) {
ssize_t res = read(sigfd, &sfd_info, sizeof(struct signalfd_siginfo));
if (0 > res) {
if (errno != EAGAIN)
LOGGER_PERROR("read from signal fd");
break;
}
if (sizeof(struct signalfd_siginfo) != res) {
LOGGER_ERROR("failed to read from signal fd, incorrect size");
continue;
}
memset(&last_sig_info, 0, sizeof(last_sig_info));
epoll_worker_ignore_events(sigfd);
for (;;) {
last_sig_info.si_pid = 0;
if (0 > waitid(P_ALL, 0, &last_sig_info, WEXITED | WNOHANG) && ECHILD != errno) {
LOGGER_PERROR("waitid");
break;
}
pid_t pid = last_sig_info.si_pid;
if (0 == pid)
break; /* no more events */
if (logger_pid == pid) {
char fname[256];
snprintf(fname, sizeof(fname), "%s-%d.crash.log", program_invocation_short_name, getpid());
fname[sizeof(fname)-1] = 0;
int fd = creat(fname, 0644);
if (0 <= fd) {
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
close(fd);
LOGGER_ERROR("logger [%d] terminated unexpectedly: %s, status=%d", pid, _get_exit_reason(&last_sig_info), last_sig_info.si_status);
}
epoll_worker_exit();
}
int i;
for (i = 0; i < num_instances-1; ++i) {
/* check if it is our pid */
if (children_pids[i] == pid) {
children_pids[i] = 0; /* mark pid as handled */
LOGGER_ERROR("child process [%d] terminated unexpectedly: %s, status=%d", pid, _get_exit_reason(&last_sig_info), last_sig_info.si_status);
epoll_worker_exit();
}
}
uint32_t loc = hashtable_lookup(&ht_pid_to_ctx, &pid, sizeof(pid));
if (0 == loc) {
LOGGER_ERROR("unhandled SIGCHLD detected, exiting...");
epoll_worker_exit();
} else {
if (0 > queue_current_ctx()) {
LOGGER_ERROR("failed to queue current context, exiting...");
return epoll_worker_exit();
}
struct ribs_context *ctx = *(struct ribs_context **)hashtable_get_val(&ht_pid_to_ctx, loc);
hashtable_remove(&ht_pid_to_ctx, &pid, sizeof(pid));
ribs_swapcurcontext(ctx);
}
}
epoll_worker_resume_events(sigfd);
}
}
}