[rpcd PATCH 3/4] rc: add option to skip running check for list method

[Christian Marangi]

Running check may be slow and increase result time in the other of 70ms
for the list method.

Add an option to skip running check by passing the skip_running_check as
true in the list method args to speedup execution if the running info is
not needed.

With the option set to true the execution time lower to just 5ms.

Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
---
 rc.c | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/rc.c b/rc.c
index 35b47e9..60ec4bf 100644
--- a/rc.c
+++ b/rc.c
@@ -20,6 +20,15 @@
 
 #define RC_LIST_EXEC_TIMEOUT_MS			3000
 
+enum {
+	RC_LIST_SKIP_RUNNING_CHECK,
+	__RC_LIST_MAX
+};
+
+static const struct blobmsg_policy rc_list_policy[] = {
+	[RC_LIST_SKIP_RUNNING_CHECK] = { "skip_running_check", BLOBMSG_TYPE_BOOL },
+};
+
 enum {
 	RC_INIT_NAME,
 	RC_INIT_ACTION,
@@ -38,6 +47,7 @@ struct rc_list_context {
 	struct ubus_request_data req;
 	struct blob_buf *buf;
 	DIR *dir;
+	bool skip_running_check;
 
 	/* Info about currently processed init.d entry */
 	struct {
@@ -82,7 +92,7 @@ static void rc_list_add_table(struct rc_list_context *c)
 	if (c->entry.stop >= 0)
 		blobmsg_add_u16(c->buf, "stop", c->entry.stop);
 	blobmsg_add_u8(c->buf, "enabled", c->entry.enabled);
-	if (c->entry.use_procd)
+	if (!c->skip_running_check && c->entry.use_procd)
 		blobmsg_add_u8(c->buf, "running", c->entry.running);
 
 	blobmsg_close_table(c->buf, e);
@@ -114,6 +124,9 @@ static int rc_list_exec(struct rc_list_context *c, const char *action, uloop_pro
 	case -1:
 		return -errno;
 	case 0:
+		if (c->skip_running_check)
+			exit(-EFAULT);
+
 		if (!c->entry.use_procd)
 			exit(-EOPNOTSUPP);
 
@@ -197,7 +210,8 @@ static void rc_list_readdir(struct rc_list_context *c)
 		int count = 0;
 
 		beginning = true;
-		while ((c->entry.start < 0 || c->entry.stop < 0 || !c->entry.use_procd) &&
+		while ((c->entry.start < 0 || c->entry.stop < 0 ||
+		       (!c->skip_running_check && !c->entry.use_procd)) &&
 		       count <= 10 && fgets(line, sizeof(line), fp)) {
 			if (beginning) {
 				if (!strncmp(line, "START=", 6)) {
@@ -236,9 +250,12 @@ static int rc_list(struct ubus_context *ctx, struct ubus_object *obj,
 		   struct ubus_request_data *req, const char *method,
 		   struct blob_attr *msg)
 {
+	struct blob_attr *tb[__RC_LIST_MAX];
 	static struct blob_buf buf;
 	struct rc_list_context *c;
 
+	blobmsg_parse(rc_list_policy, __RC_LIST_MAX, tb, blobmsg_data(msg), blobmsg_data_len(msg));
+
 	blob_buf_init(&buf, 0);
 
 	c = calloc(1, sizeof(*c));
@@ -252,6 +269,8 @@ static int rc_list(struct ubus_context *ctx, struct ubus_object *obj,
 		free(c);
 		return UBUS_STATUS_UNKNOWN_ERROR;
 	}
+	if (tb[RC_LIST_SKIP_RUNNING_CHECK])
+		c->skip_running_check = blobmsg_get_bool(tb[RC_LIST_SKIP_RUNNING_CHECK]);
 
 	ubus_defer_request(ctx, req, &c->req);
 
@@ -359,7 +378,7 @@ static int rc_init(struct ubus_context *ctx, struct ubus_object *obj,
 int rpc_rc_api_init(struct ubus_context *ctx)
 {
 	static const struct ubus_method rc_methods[] = {
-		UBUS_METHOD_NOARG("list", rc_list),
+		UBUS_METHOD("list", rc_list, rc_list_policy),
 		UBUS_METHOD("init", rc_init, rc_init_policy),
 	};
 
-- 
2.38.1