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Handle SIGPWR like SIGUSR2

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This seems to be inline with Busybox init, SysV init and, according
to the comments in code, the intended behaviour of Finit.

The effect is that `SIGPWR` will lead to Finit issuing the syscall `reboot`
with `cmd` parameter set to `RB_POWER_OFF` (rather than `RB_AUTOBOOT`), which
in turn will lead to a halt rather than a reboot.
The effect of the above inside a PID namespace other than the initial PID
namespace is that `wait` inside the parent of Finit will report that Finit was
killed with a `SIGINT` signal rather than `SIGHUP`.
This commit is contained in:
Jacques de Laval
2021-02-02 15:13:16 +01:00
parent 378456b6bd
commit 022f140b3a
1 changed files with 1 additions and 1 deletions
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src/sig.c
+1 -1
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@@ -517,11 +517,11 @@ 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);
uev_signal_init(ctx, &sigpwr_watcher, sigint_cb, NULL, SIGPWR);
/* BusyBox 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);
uev_signal_init(ctx, &sigterm_watcher, sigterm_cb, NULL, SIGTERM);
/* Some C APIs may need SIGALRM for implementing timers. */