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hotplug2: add fork handling optimization (also fixes that pesky pppoe race condition in #1655) 

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7726 3c298f89-4303-0410-b956-a3cf2f4a3e73
master
Felix Fietkau 2007-06-25 09:47:58 +00:00
parent 923e4ce031
commit c16aa532fe
1 changed files with 142 additions and 0 deletions
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142
package/hotplug2/patches/120-fork_handling.patch Normal file
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@ -0,0 +1,142 @@
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;