openwrt/package/hotplug2/patches/120-fork_handling.patch

Index: hotplug2-0.9/hotplug2.c
===================================================================
--- hotplug2-0.9.orig/hotplug2.c	2007-06-25 11:36:44.800185312 +0200
+++ hotplug2-0.9/hotplug2.c	2007-06-25 11:39:08.318367232 +0200
@@ -313,6 +313,17 @@
 }
 
 #ifdef HAVE_RULES
+static int action_needs_fork(struct hotplug2_event_t *event, struct rules_t *rules)
+{
+	int i, rv;
+
+	for (i = 0; i < rules->rules_c; i++) {
+		if (rule_needs_fork(event, &rules->rules[i]))
+			return 1;
+	}
+	return 0;
+}
+
 void perform_action(struct hotplug2_event_t *event, struct rules_t *rules) {
 	int i, rv;
 	
@@ -565,14 +576,20 @@
 		cur_seqnum = strtoull(seqnum, NULL, 0);
 		if (cur_seqnum > highest_seqnum)
 			highest_seqnum = cur_seqnum;
-		
+
 		if ((dumb && tmpevent->action == ACTION_ADD && modalias != NULL) || (!dumb)) {
-			/* 
-			 * We have more children than we want. Wait until SIGCHLD handler reduces
-			 * their numbers.
-			 */
-			while (child_c >= max_child_c) {
-				usleep(HOTPLUG2_THROTTLE_INTERVAL);
+			int untracked = 0;
+
+			if (!dumb && !action_needs_fork(tmpevent, rules))
+				untracked = 1;
+			else {
+				/*
+				 * We have more children than we want. Wait until SIGCHLD handler reduces
+				 * their numbers.
+				 */
+				while (child_c >= max_child_c) {
+					usleep(HOTPLUG2_THROTTLE_INTERVAL);
+				}
 			}
 			
 			sigemptyset(&block_mask);
@@ -595,13 +612,16 @@
 					break;
 				default:
 					DBG("spawn", "spawning: %d.", p);
-					child = add_child(child, p, cur_seqnum);
-					child_c++;
+					if (!untracked) {
+						child = add_child(child, p, cur_seqnum);
+						child_c++;
+					}
 					break;
 			}
 			sigprocmask(SIG_UNBLOCK, &block_mask, 0);
 		}
 		
+done:
 		free_hotplug2_event(tmpevent);
 	}
 
Index: hotplug2-0.9/rules.c
===================================================================
--- hotplug2-0.9.orig/rules.c	2007-06-25 11:36:44.801185160 +0200
+++ hotplug2-0.9/rules.c	2007-06-25 11:36:44.822181968 +0200
@@ -363,6 +363,41 @@
 	return EVAL_NOT_AVAILABLE;
 }
 
+int rule_needs_fork(struct hotplug2_event_t *event, struct rule_t *rule)
+{
+	int i, last_rv;
+
+	for (i = 0; i < rule->conditions_c; i++) {
+		if (rule_condition_eval(event, &(rule->conditions[i])) != EVAL_MATCH)
+			return 0;
+	}
+	for (i = 0; i < rule->actions_c; i++) {
+		switch (rule->actions[i].type) {
+			case ACT_STOP_PROCESSING:
+				return 0;
+				break;
+			case ACT_STOP_IF_FAILED:
+				if (last_rv != 0)
+					return 0;
+				break;
+			case ACT_NEXT_EVENT:
+				return 0;
+				break;
+			case ACT_NEXT_IF_FAILED:
+				if (last_rv != 0)
+					return 0;
+				break;
+			case ACT_RUN_SHELL:
+				return 1;
+				break;
+			case ACT_RUN_NOSHELL:
+				return 1;
+				break;
+		}
+	}
+	return 0;
+}
+
 int rule_execute(struct hotplug2_event_t *event, struct rule_t *rule) {
 	int i, last_rv;
 	
Index: hotplug2-0.9/rules.h
===================================================================
--- hotplug2-0.9.orig/rules.h	2007-06-25 11:36:44.801185160 +0200
+++ hotplug2-0.9/rules.h	2007-06-25 11:36:44.822181968 +0200
@@ -77,5 +77,6 @@
 int rule_execute(struct hotplug2_event_t *, struct rule_t *);
 void rules_free(struct rules_t *);
 struct rules_t *rules_from_config(char *);
+int rule_needs_fork(struct hotplug2_event_t *event, struct rule_t *rule);
 
 #endif /* ifndef RULES_H*/
Index: hotplug2-0.9/childlist.c
===================================================================
--- hotplug2-0.9.orig/childlist.c	2007-06-25 11:40:23.477941240 +0200
+++ hotplug2-0.9/childlist.c	2007-06-25 11:40:48.164188360 +0200
@@ -41,10 +41,8 @@
 struct hotplug2_child_t *remove_child_by_pid(struct hotplug2_child_t *child, pid_t pid, event_seqnum_t *largest_seqnum, int *child_c) {
 	struct hotplug2_child_t *tmp_child;
 	
-	if (child == NULL) {
-		ERROR("remove_child_by_pid", "Invalid child list passed (NULL).");
+	if (child == NULL)
 		return NULL;
-	}
 	
 	tmp_child = child;