mirror of
https://github.com/pygos/init.git
synced 2024-11-05 12:17:10 +01:00
151 lines
2.8 KiB
C
151 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later */
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/*
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* Copyright (C) 2018 - David Oberhollenzer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "init.h"
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static int ti_sock = -1;
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static int sigfd = -1;
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static void handle_signal(void)
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{
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struct signalfd_siginfo info;
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int status;
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pid_t pid;
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if (read(sigfd, &info, sizeof(info)) != sizeof(info)) {
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perror("read on signal fd");
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return;
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}
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switch (info.ssi_signo) {
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case SIGCHLD:
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while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
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status = WIFEXITED(status) ? WEXITSTATUS(status) :
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EXIT_FAILURE;
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supervisor_handle_exited(pid, status);
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}
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break;
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case SIGINT:
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/* TODO: ctrl-alt-del */
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break;
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}
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}
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static int read_msg(int fd, ti_msg_t *msg)
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{
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ssize_t ret;
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retry:
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ret = read(fd, msg, sizeof(*msg));
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if (ret < 0) {
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if (errno == EINTR)
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goto retry;
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perror("read on telinit socket");
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return -1;
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}
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if ((size_t)ret < sizeof(*msg)) {
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fputs("short read on telinit socket", stderr);
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return -1;
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}
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return 0;
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}
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static void handle_tellinit(void)
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{
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ti_msg_t msg;
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int fd;
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fd = accept(ti_sock, NULL, NULL);
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if (fd == -1)
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return;
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if (read_msg(fd, &msg)) {
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close(fd);
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return;
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}
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switch (msg.type) {
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case TI_SHUTDOWN:
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supervisor_set_target(TGT_SHUTDOWN);
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break;
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case TI_REBOOT:
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supervisor_set_target(TGT_REBOOT);
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break;
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}
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close(fd);
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}
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void target_completed(int target)
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{
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switch (target) {
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case TGT_BOOT:
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if (ti_sock == -1)
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ti_sock = mksock(INITSOCK, SOCK_FLAG_ROOT_ONLY);
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break;
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default:
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break;
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}
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}
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int main(void)
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{
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int ret, count;
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struct pollfd pfd[2];
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if (getpid() != 1) {
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fputs("init does not have pid 1, terminating!\n", stderr);
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return EXIT_FAILURE;
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}
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supervisor_init();
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sigfd = sigsetup();
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if (sigfd < 0)
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return -1;
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for (;;) {
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while (supervisor_process_queues())
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;
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memset(pfd, 0, sizeof(pfd));
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pfd[0].fd = sigfd;
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pfd[0].events = POLLIN;
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count = 1;
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if (ti_sock != -1) {
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pfd[1].fd = ti_sock;
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pfd[1].events = POLLIN;
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count = 2;
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}
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ret = poll(pfd, count, -1);
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if (ret > 0) {
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if (pfd[0].revents & POLLIN)
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handle_signal();
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if (ti_sock != -1 && pfd[1].revents & POLLIN)
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handle_tellinit();
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}
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}
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return EXIT_SUCCESS;
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}
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