improve create_listener()

[ust.git] / libust / tracectl.c

diff --git a/libust/tracectl.c b/libust/tracectl.c
index 9a651d85d38cc915ee9b2327c0c1cd092f9439d3..2d4341d3b418cd4957b8ab2efc95fbf564f6520e 100644 (file)
--- a/libust/tracectl.c
+++ b/libust/tracectl.c
@@ -63,10 +63,6 @@ struct tracecmd { /* no padding */
 /* volatile because shared between the listener and the main thread */
 volatile sig_atomic_t buffers_to_export = 0;
 
-//struct listener_arg {
-//     int pipe_fd;
-//};
-
 struct trctl_msg {
        /* size: the size of all the fields except size itself */
        uint32_t size;
@@ -778,15 +774,18 @@ void create_listener(void)
 {
 #ifdef USE_CLONE
        static char listener_stack[16384];
+       int result;
 #else
        pthread_t thread;
 #endif
 
-       if(have_listener)
+       if(have_listener) {
+               WARN("not creating listener because we already had one");
                return;
+       }
 
 #ifdef USE_CLONE
-       result = clone(listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL);
+       result = clone((int (*)(void *)) listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL);
        if(result == -1) {
                perror("clone");
                return;