From 0ac71ac773d3740b380f3cb48ab970cf1fd364be Mon Sep 17 00:00:00 2001
From: Max Christian Pohle
Date: Thu, 25 Nov 2021 14:37:41 +0100
Subject: Daemonize and allow the build of .debug and .release versions

---
 .gitignore  |  2 ++
 Jenkinsfile |  3 ++-
 Makefile    |  6 +++---
 main.c      | 18 ++++++++++++++++++
 main.h      |  3 ++-
 5 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/.gitignore b/.gitignore
index 1a94556..53e9de3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 main
+main.debug
+main.release
 
diff --git a/Jenkinsfile b/Jenkinsfile
index f452d6b..62f63cb 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -9,7 +9,8 @@ pipeline {
         }
         stage('Build') {
             steps {
-                sh 'make main'
+                sh 'make main BUILD=release'
+                sh 'make main BUILD=debug'
             }
         }
     }
diff --git a/Makefile b/Makefile
index 2458ed9..14c362c 100644
--- a/Makefile
+++ b/Makefile
@@ -12,13 +12,13 @@ CFLAGS += -I/usr/local/include
 FILES := cgi.c http_parser.c
 
 test: main
-	./main
+	./main.${BUILD}
 
 main: clean
-	$(CC) $(CFLAGS) -o $@ $(FILES) main.c $(LIBS)
+	$(CC) $(CFLAGS) -o $@.${BUILD} $(FILES) main.c $(LIBS)
 
 clean:
-	rm -f ./main
+	rm -f ./main.${BUILD}
 
 # %:
 # 	$(CC) $(CFLAGS) -o $@ $(FILES) main.c $(LIBS)
diff --git a/main.c b/main.c
index 8eb6f40..906be15 100644
--- a/main.c
+++ b/main.c
@@ -80,6 +80,22 @@ static void * answer_request(size_t new_socket) {
 	return NULL;
 }
 
+
+int become_daemon(const char * name) {
+	if(fork()) {
+		exit(EXIT_SUCCESS);
+	} else {
+		setsid();
+		if(fork()) {
+			exit(EXIT_SUCCESS);
+		} else {
+			syslog(0, "daemon '%s' is running with pid %d", name, getpid());
+			return EXIT_SUCCESS;
+		}
+	}
+}
+
+
 static int serve(int server_fd)
 {
 	struct sockaddr_in address;
@@ -127,6 +143,8 @@ int main(const int argc, char const * argv[]) {
 	? err(errno, NULL)
 	: listen(server_fd, SOMAXCONN)
 	? err(errno, NULL)
+	: become_daemon(argv[0])
+	? err(errno, NULL)
 	: serve(server_fd)
 	? err(errno, NULL)
 	: exit(EXIT_SUCCESS)
diff --git a/main.h b/main.h
index 6588a40..af156f6 100644
--- a/main.h
+++ b/main.h
@@ -48,6 +48,7 @@
 #include <arpa/inet.h>
 #include <fcntl.h>
 #include <sys/stat.h>
+#include <syslog.h>
 // #include <pthread.h>      // maybe later
 // }}}
 
@@ -83,4 +84,4 @@ void next_part(Http_Header * http_header, const char * content, size_t content_s
 void send_answer(Http_Header * http_header, int fd_socket);
 void parse_http(size_t new_socket, char * request, size_t request_length);
 
-// modeline for vim: shiftwidth=2 tabstop=2 number foldmethod=marker
+// modeline for vim: shiftwidth=2 tabstop=2 number foldmethod=marker foldenable
-- 
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