80 lines
3.9 KiB
Diff
80 lines
3.9 KiB
Diff
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Based on 4dffec1459f50ac9f8f67ccfcb79836b4ed5a50e Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Fri, 24 Oct 2014 13:44:45 +0200
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Subject: [PATCH] manager: Linux on hppa has fewer rtsigs, hence avoid using
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the higher ones there
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https://bugs.freedesktop.org/show_bug.cgi?id=84931
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---
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src/core/manager.c | 29 +++++++++++++++++++++++++++--
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1 file changed, 27 insertions(+), 2 deletions(-)
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--- src/core/manager.c
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+++ src/core/manager.c 2014-10-29 14:02:28.635837997 +0000
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@@ -340,11 +340,14 @@ static int manager_setup_signals(Manager
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assert(m);
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- /* We are not interested in SIGSTOP and friends. */
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assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
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- assert_se(sigemptyset(&mask) == 0);
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+ /* We make liberal use of realtime signals here. On
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+ * Linux/glibc we have 30 of them (with the exception of Linux
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+ * on hppa, see below), between SIGRTMIN+0 ... SIGRTMIN+30
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+ * (aka SIGRTMAX). */
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+ assert_se(sigemptyset(&mask) == 0);
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sigset_add_many(&mask,
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SIGCHLD, /* Child died */
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SIGTERM, /* Reexecute daemon */
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@@ -354,6 +357,7 @@ static int manager_setup_signals(Manager
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SIGINT, /* Kernel sends us this on control-alt-del */
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SIGWINCH, /* Kernel sends us this on kbrequest (alt-arrowup) */
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SIGPWR, /* Some kernel drivers and upsd send us this on power failure */
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+
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SIGRTMIN+0, /* systemd: start default.target */
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SIGRTMIN+1, /* systemd: isolate rescue.target */
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SIGRTMIN+2, /* systemd: isolate emergency.target */
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@@ -361,19 +365,40 @@ static int manager_setup_signals(Manager
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SIGRTMIN+4, /* systemd: start poweroff.target */
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SIGRTMIN+5, /* systemd: start reboot.target */
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SIGRTMIN+6, /* systemd: start kexec.target */
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+
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+ /* ... space for more special targets ... */
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+
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SIGRTMIN+13, /* systemd: Immediate halt */
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SIGRTMIN+14, /* systemd: Immediate poweroff */
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SIGRTMIN+15, /* systemd: Immediate reboot */
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SIGRTMIN+16, /* systemd: Immediate kexec */
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+
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+ /* ... space for more immediate system state changes ... */
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+
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SIGRTMIN+20, /* systemd: enable status messages */
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SIGRTMIN+21, /* systemd: disable status messages */
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SIGRTMIN+22, /* systemd: set log level to LOG_DEBUG */
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SIGRTMIN+23, /* systemd: set log level to LOG_INFO */
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SIGRTMIN+24, /* systemd: Immediate exit (--user only) */
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+
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+ /* .. one free signal here ... */
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+
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+#if !defined(__hppa64__) && !defined(__hppa__)
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+ /* Apparently Linux on hppa has fewer RT
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+ * signals (SIGRTMAX is SIGRTMIN+25 there),
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+ * hence let's not try to make use of them
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+ * here. Since these commands are accessible
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+ * by different means and only really a safety
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+ * net, the missing functionality on hppa
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+ * shouldn't matter. */
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+
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SIGRTMIN+26, /* systemd: set log target to journal-or-kmsg */
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SIGRTMIN+27, /* systemd: set log target to console */
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SIGRTMIN+28, /* systemd: set log target to kmsg */
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SIGRTMIN+29, /* systemd: set log target to syslog-or-kmsg */
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+
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+ /* ... one free signal here SIGRTMIN+30 ... */
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+#endif
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-1);
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assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
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