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/* SPDX-License-Identifier: ISC */
#include "init.h"
static void respawn(svc_run_data_t *rt)
{
if (rt->svc->rspwn_limit > 0) {
rt->rspwn_count += 1;
if (rt->rspwn_count >= rt->svc->rspwn_limit)
goto fail;
}
rt->pid = runsvc(rt->svc);
if (rt->pid == -1)
goto fail;
rt->state = STATE_RUNNING;
return;
fail:
rt->state = STATE_FAILED;
print_status(rt);
return;
}
static void handle_exited(svc_run_data_t *rt)
{
if (rt->svc->type == SVC_RESPAWN) {
if (config_should_respawn())
respawn(rt);
} else {
if (rt->status == EXIT_SUCCESS) {
rt->state = STATE_COMPLETED;
} else {
rt->state = STATE_FAILED;
}
print_status(rt);
}
}
static void start_service(svc_run_data_t *rt)
{
if (rt->svc->flags & SVC_FLAG_HAS_EXEC) {
rt->pid = runsvc(rt->svc);
if (rt->pid == -1) {
rt->state = STATE_FAILED;
} else {
rt->state = STATE_RUNNING;
if (rt->svc->type == SVC_WAIT)
config_set_waiting(rt);
}
} else {
rt->status = EXIT_SUCCESS;
rt->state = STATE_COMPLETED;
}
print_status(rt);
}
static void handle_signal(int fd)
{
struct signalfd_siginfo info;
svc_run_data_t *rt;
int status;
pid_t pid;
if (read(fd, &info, sizeof(info)) < (ssize_t)sizeof(info))
return;
switch (info.ssi_signo) {
case SIGTERM:
config_set_target(TGT_SHUTDOWN);
break;
case SIGINT:
config_set_target(TGT_REBOOT);
break;
case SIGCHLD:
while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
rt = config_rt_data_by_pid(pid);
if (rt == NULL)
continue;
if (WIFEXITED(status)) {
rt->status = WEXITSTATUS(status);
} else {
rt->status = EXIT_FAILURE;
}
rt->pid = -1;
handle_exited(rt);
}
break;
case SIGHUP:
break;
case SIGUSR1:
break;
}
}
int main(void)
{
struct epoll_event ev;
svc_run_data_t *rt;
int ret, sfd, epfd;
sigset_t sigmask;
cli(NULL);
if (config_load())
return EXIT_FAILURE;
epfd = epoll_create1(EPOLL_CLOEXEC);
if (epfd < 0) {
perror("epoll_create");
return EXIT_FAILURE;
}
sigemptyset(&sigmask);
sigaddset(&sigmask, SIGTERM);
sigaddset(&sigmask, SIGINT);
sigaddset(&sigmask, SIGHUP);
sigaddset(&sigmask, SIGUSR1);
sigaddset(&sigmask, SIGCHLD);
sfd = signalfd(-1, &sigmask, SFD_CLOEXEC);
if (sfd < 0) {
perror("signalfd");
return EXIT_FAILURE;
}
memset(&ev, 0, sizeof(ev));
ev.events = EPOLLIN;
ev.data.fd = sfd;
if (epoll_ctl(epfd, EPOLL_CTL_ADD, sfd, &ev)) {
perror("adding signalfd to epoll");
return EXIT_FAILURE;
}
if (reboot(LINUX_REBOOT_CMD_CAD_OFF))
perror("cannot disable CTRL+ALT+DEL");
for (;;) {
rt = config_dequeue();
if (rt != NULL) {
start_service(rt);
continue;
}
ret = epoll_wait(epfd, &ev, 1, -1);
if (ret == 0)
continue;
if (ret < 0) {
perror("epoll wait");
return EXIT_FAILURE;
}
if (ev.data.fd == sfd) {
handle_signal(sfd);
}
}
return EXIT_SUCCESS;
}
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