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/* SPDX-License-Identifier: ISC */
#include "init.h"
static int sigfd = -1;
static int sockfd = -1;
static void handle_signal(void)
{
struct signalfd_siginfo info;
int status;
pid_t pid;
if (read(sigfd, &info, sizeof(info)) != sizeof(info)) {
perror("read on signal fd");
return;
}
switch (info.ssi_signo) {
case SIGCHLD:
while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
status = WIFEXITED(status) ? WEXITSTATUS(status) :
EXIT_FAILURE;
supervisor_handle_exited(pid, status);
}
break;
case SIGTERM:
supervisor_set_target(TGT_SHUTDOWN);
break;
case SIGINT:
supervisor_set_target(TGT_REBOOT);
break;
case SIGUSR1:
if (sockfd >= 0) {
close(sockfd);
unlink(INIT_SOCK_PATH);
sockfd = -1;
}
sockfd = init_socket_create();
break;
}
}
static void handle_request(void)
{
struct sockaddr_un addr;
init_request_t rq;
socklen_t addrlen;
ssize_t ret;
retry:
memset(&rq, 0, sizeof(rq));
addrlen = sizeof(addr);
ret = recvfrom(sockfd, &rq, sizeof(rq), MSG_DONTWAIT | MSG_TRUNC,
(struct sockaddr *)&addr, &addrlen);
if (ret < 0 && errno == EINTR)
goto retry;
if ((size_t)ret < sizeof(rq))
return;
switch (rq.rq) {
case EIR_STATUS:
supervisor_answer_status_request(sockfd, &addr, addrlen);
break;
}
}
void target_completed(int target)
{
switch (target) {
case TGT_BOOT:
if (sockfd < 0)
sockfd = init_socket_create();
break;
case TGT_SHUTDOWN:
for (;;)
reboot(RB_POWER_OFF);
break;
case TGT_REBOOT:
for (;;)
reboot(RB_AUTOBOOT);
break;
}
}
int main(void)
{
int i, ret, count;
struct pollfd pfd[2];
if (getpid() != 1) {
fputs("init does not have pid 1, terminating!\n", stderr);
return EXIT_FAILURE;
}
supervisor_init();
sigfd = sigsetup();
if (sigfd < 0)
return -1;
for (;;) {
while (supervisor_process_queues())
;
memset(pfd, 0, sizeof(pfd));
count = 0;
pfd[count].fd = sigfd;
pfd[count].events = POLLIN;
++count;
if (sockfd >= 0) {
pfd[count].fd = sockfd;
pfd[count].events = POLLIN;
++count;
}
ret = poll(pfd, count, -1);
if (ret <= 0)
continue;
for (i = 0; i < count; ++i) {
if (pfd[i].revents & POLLIN) {
if (pfd[i].fd == sigfd)
handle_signal();
if (pfd[i].fd == sockfd)
handle_request();
}
}
}
return EXIT_SUCCESS;
}
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