Reopen logs on SIGHUP (GitHub issue #10)

server.c

@@ -82,6 +82,7 @@ server_new(const char *cfg_file) {
 	int i;
 	struct server *s = calloc(1, sizeof(struct server));
 
+	s->log.fd = -1;
 	s->cfg = conf_read(cfg_file);
 
 	/* workers */
@@ -178,6 +179,9 @@ server_start(struct server *s) {
 
 	slog_init(s);
 
+	/* install signal handler to reload logs */
+	signal(SIGHUP, slog_reload);
+
 	/* start worker threads */
 	for(i = 0; i < s->cfg->http_threads; ++i) {
 		worker_start(s->w[i]);

slog.c

@@ -14,18 +14,30 @@
 #include "server.h"
 #include "conf.h"
 
+/* global pointer to the server objects, used to reload logs */
+static struct server *__server;
+
 /**
  * Initialize log writer.
  */
 void
 slog_init(struct server *s) {
 
+	__server = s;
 	s->log.self = getpid();
 
 	if(s->cfg->logfile) {
+
+		int old_fd = s->log.fd;
+
 		s->log.fd = open(s->cfg->logfile,
 			O_WRONLY | O_APPEND | O_CREAT, S_IRUSR|S_IWUSR);
 
+		/* close old log */
+		if (old_fd != -1) {
+			close(old_fd);
+		}
+
 		if (s->log.fd != -1)
 			return;
 
@@ -35,6 +47,14 @@ slog_init(struct server *s) {
 	s->log.fd = 2; /* stderr */
 }
 
+/**
+ * Reload log file on SIGHUP
+ */
+void
+slog_reload() {
+	slog_init(__server);
+}
+
 /**
  * Write log message to disk, or stderr.
  */

slog.h

@@ -11,6 +11,9 @@ typedef enum {
 
 struct server;
 
+void
+slog_reload();
+
 void
 slog_init(struct server *s);