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Adopt BusyBox init signal handling for halt/reboot/poweroff
This patch adopts the BusyBox init signals for handling halt, reboot, and poweroff. The SIGINT and SIGPWR signals still behave the same as before, even though they likely will become configurable in a future release. Note: the disabling of Ctrl-Alt-Delete (SIGINT) is also removed! Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
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@@ -21,21 +21,47 @@
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* The standard SysV init only responds to the following signals:
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* SIGHUP
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* Has the same effect as telinit q.
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* Finit is often used on embedded and small Linux systems with BusyBox.
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* For compatibility with its existing toolset (halt, poweroff, reboot),
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* the following signals have been adopted:
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*
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* SIGUSR1
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* On receipt of this signals, init closes and re-opens its control
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* fifo, /dev/initctl. Useful for bootscripts when /dev is remounted.
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* SIGHUP
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* Same effect as init/telinit q, reloads *.conf in /etc/finit.d/
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*
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* SIGINT
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* Normally the kernel sends this signal to init when CTRL-ALT-DEL is
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* pressed. It activates the ctrlaltdel action.
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* SIGUSR1
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* Calls shutdown hooks, including HOOK_SHUTDOWN, stops all running
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* processes, and unmounts all file systems. Then tells kernel to
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* halt. Most people these days want SIGUSR2 though.
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*
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* SIGWINCH
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* The kernel sends this signal when the KeyboardSignal key is hit.
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* It activates the kbrequest action.
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* (SysV init and systemd use this to re-open their FIFO/D-Bus.)
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*
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* SIGUSR2
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* Like SIGUSR1, but tell kernel to power-off the system, if ACPI
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* or similar exists to actually do this. If the kernel fails
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* power-off, Finit falls back to halt.
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*
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* (SysV init N/A, systemd dumps its internal state to log.)
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*
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* SIGTERM
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* Like SIGUSR1, but tell kernel to reboot the system when done.
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*
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* (SysV init N/A, systemd rexecutes itself.)
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*
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* SIGINT
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* Sent from kernel when the CTRL-ALT-DEL key combo is pressed.
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* SysV init and systemd default to reboot with `shutdown -r`.
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* Finit currently forwards this to SIGTERM.
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*
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* SIGWINCH
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* Sent from kernel when the KeyboardSignal key is pressed. Some
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* users bind keys, see loadkeys(1), to create consoles on demand.
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* Finit currently ignores this signal.
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*
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* SIGPWR
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* Sent from a power daemon, like powstatd(8), on changes to the
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* UPS status. Traditionally SysV init read /etc/powerstatus and
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* acted on "OK", "FAIL", or "LOW" and then removed the file.
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* Finit currently forwards this to SIGUSR2.
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*/
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#include <sched.h>
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@@ -54,12 +80,13 @@
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#include "service.h"
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static int stopped = 0;
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static uev_t sighup_watcher, sigint_watcher, sigpwr_watcher;
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static uev_t sigterm_watcher, sigusr1_watcher, sigusr2_watcher;
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static uev_t sighup_watcher, sigint_watcher, sigpwr_watcher;
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static uev_t sigchld_watcher, sigsegv_watcher;
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static uev_t sigstop_watcher, sigtstp_watcher, sigcont_watcher;
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void do_shutdown(int sig)
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void do_shutdown(shutop_t op)
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{
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touch(SYNC_SHUTDOWN);
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@@ -121,15 +148,18 @@ void do_shutdown(int sig)
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run("/bin/mount -n -o remount,ro dummydev /");
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run("/bin/mount -n -o remount,ro /");
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_e("PID %d: %s ...", getpid(), sig == SIGINT || sig == SIGUSR1 ? "Rebooting" : "Halting");
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_e("PID %d: %s ...", getpid(), op == SHUT_REBOOT ? "Rebooting" : "Halting");
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do_sleep(5);
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_d("%s.", sig == SIGINT || sig == SIGUSR1 ? "Rebooting" : "Halting");
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if (sig == SIGINT || sig == SIGUSR1)
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_d("%s.", op == SHUT_REBOOT ? "Rebooting" : "Halting");
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if (op == SHUT_REBOOT)
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reboot(RB_AUTOBOOT);
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reboot(RB_POWER_OFF);
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reboot(RB_HALT_SYSTEM); /* Eh, what? Should not get here ... */
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if (op == SHUT_OFF)
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reboot(RB_POWER_OFF);
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/* Also fallback if any of the other two fails */
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reboot(RB_HALT_SYSTEM);
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}
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/*
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@@ -142,11 +172,35 @@ static void sighup_cb(uev_t *UNUSED(w), void *UNUSED(arg), int UNUSED(events))
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}
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/*
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* Shut down on INT PWR
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* SIGINT: Should generate <sys/key/ctrlaltdel> condition, for now reboot
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*/
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static void sigint_cb(uev_t *w, void *UNUSED(arg), int UNUSED(events))
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static void sigint_cb(uev_t *UNUSED(w), void *UNUSED(arg), int UNUSED(events))
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{
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do_shutdown(w->signo);
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do_shutdown(SHUT_REBOOT);
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}
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/*
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* SIGUSR1: BusyBox style halt
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*/
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static void sigusr1_cb(uev_t *UNUSED(w), void *UNUSED(arg), int UNUSED(events))
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{
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do_shutdown(SHUT_HALT);
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}
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/*
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* SIGUSR2: BusyBox style poweroff
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*/
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static void sigusr2_cb(uev_t *UNUSED(w), void *UNUSED(arg), int UNUSED(events))
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{
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do_shutdown(SHUT_OFF);
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}
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/*
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* SIGTERM: BusyBox style reboot
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*/
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static void sigterm_cb(uev_t *UNUSED(w), void *UNUSED(arg), int UNUSED(events))
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{
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do_shutdown(SHUT_REBOOT);
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}
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/*
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@@ -237,6 +291,9 @@ void sig_unblock(void)
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sigaddset(&nmask, SIGSTOP);
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sigaddset(&nmask, SIGTSTP);
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sigaddset(&nmask, SIGCONT);
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sigaddset(&nmask, SIGTERM);
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sigaddset(&nmask, SIGUSR1);
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sigaddset(&nmask, SIGUSR2);
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sigprocmask(SIG_UNBLOCK, &nmask, NULL);
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/* Reset signal handlers that were set by the parent process */
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@@ -261,12 +318,10 @@ void sig_setup(uev_ctx_t *ctx)
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uev_signal_init(ctx, &sigint_watcher, sigint_cb, NULL, SIGINT);
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uev_signal_init(ctx, &sigpwr_watcher, sigint_cb, NULL, SIGPWR);
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/* Ignore SIGUSR1/2 for now, only BusyBox init implements them as reboot+halt. */
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// uev_signal_init(&ctx, &sigusr1_watcher, reopen_initctl_cb, NULL, SIGUSR1);
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// uev_signal_init(&ctx, &sigusr2_watcher, pwrdwn_cb, NULL, SIGUSR2);
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/* Init must ignore SIGTERM. May otherwise get false SIGTERM in forked children! */
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IGNSIG(sa, SIGTERM, 0);
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/* BusyBox init style signals for halt, power-off and reboot. */
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uev_signal_init(ctx, &sigusr1_watcher, sigusr1_cb, NULL, SIGUSR1);
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uev_signal_init(ctx, &sigusr2_watcher, sigusr2_cb, NULL, SIGUSR2);
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uev_signal_init(ctx, &sigterm_watcher, sigterm_cb, NULL, SIGTERM);
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/* Some C APIs may need SIGALRM for implementing timers. */
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IGNSIG(sa, SIGALRM, 0);
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@@ -285,8 +340,6 @@ void sig_setup(uev_ctx_t *ctx)
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uev_signal_init(ctx, &sigtstp_watcher, sigstop_cb, NULL, SIGTSTP);
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uev_signal_init(ctx, &sigcont_watcher, sigcont_cb, NULL, SIGCONT);
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/* Disable CTRL-ALT-DELETE from kernel, we handle shutdown gracefully with SIGINT, above */
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reboot(RB_DISABLE_CAD);
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setsid();
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}
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