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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* Copyright (C) 2018 - David Oberhollenzer
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "init.h"
static int ti_sock = -1;
static int sigfd = -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;
}
}
static int read_msg(int fd, ti_msg_t *msg)
{
ssize_t ret;
retry:
ret = read(fd, msg, sizeof(*msg));
if (ret < 0) {
if (errno == EINTR)
goto retry;
perror("read on telinit socket");
return -1;
}
if ((size_t)ret < sizeof(*msg)) {
fputs("short read on telinit socket", stderr);
return -1;
}
return 0;
}
static void handle_tellinit(void)
{
ti_msg_t msg;
int fd;
fd = accept(ti_sock, NULL, NULL);
if (fd == -1)
return;
if (read_msg(fd, &msg)) {
close(fd);
return;
}
switch (msg.type) {
case TI_SHUTDOWN:
supervisor_set_target(TGT_SHUTDOWN);
break;
case TI_REBOOT:
supervisor_set_target(TGT_REBOOT);
break;
}
close(fd);
}
void target_completed(int target)
{
switch (target) {
case TGT_BOOT:
if (ti_sock == -1)
ti_sock = mksock(INITSOCK, SOCK_FLAG_ROOT_ONLY);
break;
case TGT_SHUTDOWN:
for (;;)
reboot(RB_POWER_OFF);
break;
case TGT_REBOOT:
for (;;)
reboot(RB_AUTOBOOT);
break;
}
}
int main(void)
{
int 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));
pfd[0].fd = sigfd;
pfd[0].events = POLLIN;
count = 1;
if (ti_sock != -1) {
pfd[1].fd = ti_sock;
pfd[1].events = POLLIN;
count = 2;
}
ret = poll(pfd, count, -1);
if (ret > 0) {
if (pfd[0].revents & POLLIN)
handle_signal();
if (ti_sock != -1 && pfd[1].revents & POLLIN)
handle_tellinit();
}
}
return EXIT_SUCCESS;
}
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