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Change SIGUSR1 to be compatible with systemd and SysV init

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This patch changes the behavior of SIGUSR1.  Previously USR1 could be
used to halt a running Finit system, similar to BusyBox init.  However,
compatibility with sysvinit and systemd has been deemed more important.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2021-05-02 14:48:49 +02:00
parent 3872077ff1
commit 53c7ddcb22
3 changed files with 34 additions and 22 deletions
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src/reboot.c
+1 -1
View File
@@ -206,7 +206,7 @@ int reboot_main(int argc, char *argv[])
case CMD_HALT:
if (do_halt(NULL))
do_kill(SIGUSR1, msg);
do_kill(SIGUSR2, msg);
break;
case CMD_POWEROFF:
src/sig.c
+16 -12
View File
@@ -31,21 +31,24 @@
* does on USR1 with their FIFO/D-Bus.
*
* SIGUSR1
* Calls shutdown hooks, including HOOK_SHUTDOWN, stops all running
* processes, and unmounts all file systems. Then tells kernel to
* halt. Most people these days want SIGUSR2 though.
* Restarts API (initctl) socket, like SysV init and systemd does
* on USR1 with their FIFO/D-Bus.
*
* (SysV init and systemd use this to re-open their FIFO/D-Bus.)
* Finit <= 4.0 used to perform a system halt on USR1. This caused
* some quite nasty problems on systems with both systemd/sysvinit
* installed alongside finit. For compatibility reasons Finit 4.1
* changed to partial SIGHUP (api_exit/init).
*
* SIGUSR2
* Like SIGUSR1, but tell kernel to power-off the system, if ACPI
* or similar exists to actually do this. If the kernel fails
* power-off, Finit falls back to halt.
* Calls shutdown hooks, including HOOK_SHUTDOWN, stops all running
* processes, and unmounts all file systems. Then tells kernel to
* power-off the system, if ACPI or similar exists to actually do
* this. If the kernel fails power-off, Finit falls back to halt.
*
* (SysV init N/A, systemd dumps its internal state to log.)
*
* SIGTERM
* Like SIGUSR1, but tell kernel to reboot the system when done.
* Like SIGUSR2, but tell kernel to reboot the system when done.
*
* (SysV init N/A, systemd rexecutes itself.)
*
@@ -323,7 +326,7 @@ static void sigint_cb(uev_t *w, void *arg, int events)
}
/*
* SIGUSR1: BusyBox style halt
* SIGUSR1: SysV init/systemd API socket restart
*/
static void sigusr1_cb(uev_t *w, void *arg, int events)
{
@@ -333,8 +336,9 @@ static void sigusr1_cb(uev_t *w, void *arg, int events)
return;
}
halt = SHUT_HALT;
service_runlevel(0);
/* Restart initctl API domain socket, similar to systemd/SysV init */
api_exit();
api_init(w->ctx);
}
/*
@@ -520,7 +524,7 @@ void sig_setup(uev_ctx_t *ctx)
/* Standard SysV init calls ctrl-alt-delete handler */
uev_signal_init(ctx, &sigint_watcher, sigint_cb, NULL, SIGINT);
/* BusyBox init style signals for halt, power-off and reboot. */
/* BusyBox/SysV init style signals for halt, power-off and reboot. */
uev_signal_init(ctx, &sigusr1_watcher, sigusr1_cb, NULL, SIGUSR1);
uev_signal_init(ctx, &sigusr2_watcher, sigusr2_cb, NULL, SIGUSR2);
uev_signal_init(ctx, &sigpwr_watcher, sigusr2_cb, NULL, SIGPWR);