Add daemonize support.

README.markdown

@@ -34,6 +34,7 @@ curl -d "GET/hello" http://127.0.0.1:7379/
 * Cross-origin XHR, if compiled with libevent2 (for `OPTIONS` support).
 * File upload with PUT, if compiled with libevent2 (for `PUT` support).
 * With the JSON output, the return value of INFO is parsed and transformed into an object.
+* Optional daemonize.
 
 # Ideas, TODO...
 * Add better support for PUT, DELETE, HEAD, OPTIONS? How? For which commands?

conf.c

@@ -34,6 +34,7 @@ conf_read(const char *filename) {
 	conf->group = getgid();
 	conf->logfile = "webdis.log";
 	conf->verbosity = WEBDIS_NOTICE;
+	conf->daemonize = 0;
 
 	j = json_load_file(filename, 0, &error);
 	if(!j) {
@@ -75,6 +76,8 @@ conf_read(const char *filename) {
 			if(tmp < 0) conf->verbosity = WEBDIS_ERROR;
 			else if(tmp > (int)WEBDIS_DEBUG) conf->verbosity = WEBDIS_DEBUG;
 			else conf->verbosity = (log_level)tmp;
+		} else if(strcmp(json_object_iter_key(kv), "daemonize") == 0 && json_typeof(jtmp) == JSON_TRUE) {
+			conf->daemonize = 1;
 		}
 	}
 

conf.h

@@ -15,6 +15,9 @@ struct conf {
 	char *http_host;
 	short http_port;
 
+	/* daemonize process, off by default */
+	int daemonize;
+
 	/* ACL */
 	struct acl *perms;
 

server.c

@@ -10,6 +10,9 @@
 #include <unistd.h>
 #include <signal.h>
 #include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 
 struct server *
 server_new(const char *filename) {
@@ -184,9 +187,31 @@ on_request(struct evhttp_request *rq, void *ctx) {
 	}
 }
 
+/* Taken from Redis. */
+void
+server_daemonize(void) {
+	int fd;
+
+	if (fork() != 0) exit(0); /* parent exits */
+	setsid(); /* create a new session */
+
+	/* Every output goes to /dev/null. */
+	if ((fd = open("/dev/null", O_RDWR, 0)) != -1) {
+		dup2(fd, STDIN_FILENO);
+		dup2(fd, STDOUT_FILENO);
+		dup2(fd, STDERR_FILENO);
+		if (fd > STDERR_FILENO) close(fd);
+	}
+}
+
 void
 server_start(struct server *s) {
 
+
+	if(s->cfg->daemonize) {
+		server_daemonize();
+	}
+
 	/* ignore sigpipe */
 #ifdef SIGPIPE
 	signal(SIGPIPE, SIG_IGN);

webdis.json

@@ -7,6 +7,8 @@
 	"http_host":	"0.0.0.0",
 	"http_port":	7379,
 
+	"daemonize":	false,
+
 	"acl": [
 		{
 			"disabled":	["DEBUG"]