From b6ace6eda12140c29ee58ec9178b9212b21fa538 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <koszko@koszko.org>
Date: Thu, 22 Jul 2021 14:42:58 +0200
Subject: add option to wait for termination by SIGTERM instead of by stdin
 input

---
 main.c  |  5 +++--
 serve.c | 16 ++++++++++++++--
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/main.c b/main.c
index 99769f2..b5619fe 100644
--- a/main.c
+++ b/main.c
@@ -13,6 +13,7 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include <cjson/cJSON.h>
 
@@ -155,7 +156,7 @@ static void print_component_name(const void *key, void *val, void *arg)
 	       unfilled ? " (referenced only)" : "");
 }
 
-int serve_scriptbase(struct scriptbase *base);
+int serve_scriptbase(struct scriptbase *base, bool);
 
 int main(int argc, char *argv[])
 {
@@ -174,7 +175,7 @@ int main(int argc, char *argv[])
 	puts("## LOADED PAGES:");
 	ht_map(&base.pages, (void*) 'p', print_component_name);
 
-	if (serve_scriptbase(&base))
+	if (serve_scriptbase(&base, !!getenv("HYDRILLA_WAIT_SIGTERM")))
 		fprintf(stderr, "Error serving scriptbase.\n");
 
 	scriptbase_destroy(&base);
diff --git a/serve.c b/serve.c
index dd61da1..8ef0ce3 100644
--- a/serve.c
+++ b/serve.c
@@ -9,10 +9,13 @@
  * `doc/examples/logging.c' in libmicrohttpd source tree.
  */
 
+#define _POSIX_C_SOURCE 199506L /* sigwait() */
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#include <signal.h>
 
 #include <sys/types.h>
 #include <sys/select.h>
@@ -160,10 +163,12 @@ static int answer(void *data,
 
 int getchar(void);
 
-int serve_scriptbase(struct scriptbase *base)
+int serve_scriptbase(struct scriptbase *base, bool wait_for_sigterm)
 {
 	int i;
 	struct MHD_Daemon *daemon;
+	sigset_t sigterm_set;
+	int signal_number; /* only written, not read */
 	int retval = -1;
 
 	if (init_url_lookup_regex())
@@ -185,7 +190,14 @@ int serve_scriptbase(struct scriptbase *base)
 	if (!daemon)
 		goto free_resources;
 
-	getchar();
+	if (wait_for_sigterm) {
+		sigemptyset(&sigterm_set);
+		sigaddset(&sigterm_set, SIGTERM);
+		sigwait(&sigterm_set, &signal_number);
+	} else {
+		getchar();
+	}
+
 	MHD_stop_daemon(daemon);
 
 	retval = 0;
-- 
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