unixsock plugin: Make sure the initialization function is run only once.

If called multiple times, the global `sock_fd' variable will be re-set,
breaking the plugin.

diff --git a/src/unixsock.c b/src/unixsock.c
index d80091b1bd18bfffd290ae4c7a54b6086131605f..3dac88a49b437ec8105c170faf1366c65178f605 100644 (file)
--- a/src/unixsock.c
+++ b/src/unixsock.c
@@ -382,8 +382,15 @@ static int us_config (const char *key, const char *val)
 
 static int us_init (void)
 {
+       static int have_init = 0;
+
        int status;
 
+       /* Initialize only once. */
+       if (have_init != 0)
+               return (0);
+       have_init = 1;
+
        loop = 1;
 
        status = pthread_create (&listen_thread, NULL, us_server_thread, NULL);