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init/initd/signal_linux.c

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/* SPDX-License-Identifier: ISC */
#include <stdio.h>
#include "init.h"
int sigsetup(void)
{
sigset_t mask;
int sfd;
sigfillset(&mask);
if (sigprocmask(SIG_SETMASK, &mask, NULL) == -1) {
perror("sigprocmask");
return -1;
}
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGTERM);
sigaddset(&mask, SIGUSR1);
sigaddset(&mask, SIGHUP);
sfd = signalfd(-1, &mask, SFD_CLOEXEC);
if (sfd == -1) {
perror("signalfd");
return -1;
}
if (reboot(LINUX_REBOOT_CMD_CAD_OFF))
perror("cannot disable CTRL+ALT+DEL");
return sfd;
}
void sigreset(void)
{
sigset_t mask;
sigemptyset(&mask);
sigprocmask(SIG_SETMASK, &mask, NULL);
}