From a091370e612b79452ac882e299d0e85154a64b59 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <m@maandree.se>
Date: Fri, 21 Mar 2025 23:46:04 +0100
Subject: misc stuff
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Signed-off-by: Mattias Andrée <m@maandree.se>
---
 src/signals.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 47 insertions(+), 4 deletions(-)

(limited to 'src/signals.c')

diff --git a/src/signals.c b/src/signals.c
index 3487d23..390d684 100644
--- a/src/signals.c
+++ b/src/signals.c
@@ -25,8 +25,8 @@ volatile sig_atomic_t disable = 0;
 
 
 /**
- * Signal handlar for exit signals (SIGINT, SIGTERM, SIGQUIT)
- *
+ * Signal handler for exit signals (SIGINT, SIGTERM, SIGQUIT)
+ * 
  * @param  signo  The received signal
  */
 static void
@@ -41,8 +41,8 @@ sigexit(int signo)
 
 
 /**
- * Signal handlar for disable signal (SIGUSR1)
- *
+ * Signal handler for disable signal (SIGUSR1)
+ * 
  * @param  signo  The received signal
  */
 #ifndef WINDOWS
@@ -55,6 +55,24 @@ sigdisable(int signo)
 #endif
 
 
+/**
+ * Signal handler for forceful exiting; installed by
+ * `install_forceful_exit_signal_handlers`
+ * 
+ * @param  signo  The received signal
+ */
+#ifndef WINDOWS
+static void
+sigalrm(int signo)
+{
+	if (exiting || signo == SIGALRM)
+		exit(0);
+	exiting = 1;
+	alarm(1U);
+}
+#endif
+
+
 void
 install_signal_handlers(void)
 {
@@ -90,3 +108,28 @@ install_signal_handlers(void)
 		eprintf("sigaction SIGCHLD &{.sa_handler=SIG_IGN, .sa_mask={}, .sa_flags=0} NULL:");
 #endif
 }
+
+
+#ifndef WINDOWS
+void
+install_forceful_exit_signal_handlers(void)
+{
+	struct sigaction sigact;
+	sigset_t sigset;
+
+	exiting = 0;
+	memset(&sigact, 0, sizeof(sigact));
+	sigemptyset(&sigset);
+	sigact.sa_mask = sigset;
+	sigact.sa_flags = 0;
+	sigact.sa_handler = &sigalrm;
+	if (sigaction(SIGINT, &sigact, NULL))
+		eprintf("sigaction SIGINT &{.sa_handler=<function pointer>, .sa_mask={}, .sa_flags=0} NULL:");
+	if (sigaction(SIGTERM, &sigact, NULL))
+		eprintf("sigaction SIGTERM &{.sa_handler=<function pointer>, .sa_mask={}, .sa_flags=0} NULL:");
+	if (sigaction(SIGQUIT, &sigact, NULL))
+		eprintf("sigaction SIGQUIT &{.sa_handler=<function pointer>, .sa_mask={}, .sa_flags=0} NULL:");
+	if (sigaction(SIGALRM, &sigact, NULL))
+		eprintf("sigaction SIGALRM &{.sa_handler=<function pointer>, .sa_mask={}, .sa_flags=0} NULL:");
+}
+#endif
-- 
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