refine #128

src/local.c

@@ -1166,31 +1166,33 @@ int main (int argc, char **argv)
 }
 #else
 
-int start_ss_service(profile_t profile)
+int start_ss_service(profile_t profile, int background)
 {
 
 #ifndef __MINGW32__
-    /* Our process ID and Session ID */
-    pid_t pid;
+    if (background) {
+        /* Our process ID and Session ID */
+        pid_t pid;
 
-    /* Fork off the parent process */
-    pid = fork();
-    if (pid < 0)
-    {
-       return -1;
-    }
+        /* Fork off the parent process */
+        pid = fork();
+        if (pid < 0)
+        {
+            return -1;
+        }
 
-    /* If we got a good PID, then
-       we can exit the parent process. */
-    if (pid > 0)
-    {
-        return pid;
-    }
+        /* If we got a good PID, then
+           we can exit the parent process. */
+        if (pid > 0)
+        {
+            return pid;
+        }
 
-    /* Close out the standard file descriptors */
-    close(STDIN_FILENO);
-    close(STDOUT_FILENO);
-    close(STDERR_FILENO);
+        /* Close out the standard file descriptors */
+        close(STDIN_FILENO);
+        close(STDOUT_FILENO);
+        close(STDERR_FILENO);
+    }
 #endif
 
     srand(time(NULL));

src/shadowsocks.h

@@ -40,8 +40,7 @@ typedef struct {
     int verbose;          // verbose mode
 } profile_t;
 
-/*
- * An example profile
+/* An example profile
 
 const profile_t EXAMPLE_PROFILE = {
     .remote_host = "example.com",
@@ -57,14 +56,21 @@ const profile_t EXAMPLE_PROFILE = {
     .udp_relay = 0,
     .verbose = 0
 };
-
 */
 
-// Create and start a shadowsocks service,
-// If success, return the pid, if not, return -1
-// On win32, this function won't return,
-// you have to call it in on other processes
-int start_ss_service(profile_t profile);
+/*
+ * Create and start a shadowsocks service.
+ *
+ * If background is set to true, the service will run in a child process and
+ * return the pid if success. Otherwise, calling this function will block the
+ * current thread forever.
+ *
+ * On Win32, background mode is invalid. This function will always block the
+ * caller and never return.
+ *
+ * If failed, -1 is returned.
+*/
+int start_ss_service(profile_t profile, int background);
 
 // To stop the service on posix system, just kill the daemon process
 // kill(pid, SIGKILL);