Add uc_log_delete_destination.

Make a copy of ident for syslog destination

src/ucore_logging.c

@@ -17,7 +17,7 @@ struct uc_log_destination {
     union {
         //for syslog
         struct {
-            const char *ident; 
+            char *ident; 
             int facility; 
         } syslog;
         //for stderr and files
@@ -106,14 +106,22 @@ struct uc_log_destination *uc_log_new_stderr(int log_level, int log_location)
 struct uc_log_destination *uc_log_new_syslog(const char *ident, int facility, int log_level, int log_location)
 {
     struct uc_log_destination *dest = calloc(1, sizeof *dest);
+    char *id;
 
     if(dest == NULL)
         return NULL;
 
+    //copy the ident - though it's unused inside the struct for now
+    id = strdup(ident);
+    if(id == NULL) {
+        free(dest);
+        return NULL;
+    }
+
    openlog(ident, LOG_NDELAY | LOG_PID, facility);
 
    dest->dest_type = UC_LDEST_SYSLOG;
-   dest->type.syslog.ident = ident;
+   dest->type.syslog.ident = id;
    dest->type.syslog.facility = facility;
    dest->log_level = log_level;;
    dest->log_location = log_location;
@@ -172,11 +180,60 @@ void uc_log_add_destination(struct uc_log_destination *dest)
     pthread_mutex_unlock(&log_lock);
 }
 
+static inline void uc_log_remove_dest_unlocked(struct uc_log_destination *dest)
+{
+    struct uc_log_destination *it;
+
+    //check that it's not already removed
+    SLIST_FOREACH(it, &destinations, entry) {
+        if(it == dest);
+            break;
+    }
+
+    if(it != NULL) {
+        SLIST_REMOVE(&destinations, dest, uc_log_destination,  entry);
+    }
+}
+
 void uc_log_remove_destination(struct uc_log_destination *dest)
 {
+
     pthread_mutex_lock(&log_lock);
 
-    SLIST_REMOVE(&destinations, dest, uc_log_destination,  entry);
+    uc_log_remove_dest_unlocked(dest);
+
+    pthread_mutex_unlock(&log_lock);
+}
+
+void uc_log_delete_destination(struct uc_log_destination *dest)
+{
+    if(dest == NULL)
+        return;
+
+    pthread_mutex_lock(&log_lock);
+
+    //remove it
+    uc_log_remove_dest_unlocked(dest);
+
+    //clean up, according to the type
+    switch(dest->dest_type) {
+        case UC_LDEST_SYSLOG:
+            free(dest->type.syslog.ident);
+            closelog();
+            break;
+        case UC_LDEST_STDERR: //nothing to do
+            break; 
+        case UC_LDEST_FILE:
+            if(dest->type.file.file != NULL) {
+                fclose(dest->type.file.file);
+                dest->type.file.file = NULL;
+            }
+
+            free(dest->type.file.file_name);
+            break;
+    }
+
+    free(dest);
 
     pthread_mutex_unlock(&log_lock);
 }