lmkd: Add library function to unregister a process

Introduce lmkd_unregister_proc helper function. Fix a bug where
lmkd_pack_set_procremove used a wrong structure as a parameter.

Bug: 129011369
Test: verify process record removal when it is manually killed
Change-Id: I7ab5a499f6b1c6eecfdba4d0a5ec916053e2726a
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
diff --git a/lmkd/liblmkd_utils.c b/lmkd/liblmkd_utils.c
index 980cd35..280c149 100644
--- a/lmkd/liblmkd_utils.c
+++ b/lmkd/liblmkd_utils.c
@@ -42,6 +42,17 @@
     return (ret < 0) ? -1 : 0;
 }
 
+int lmkd_unregister_proc(int sock, struct lmk_procremove *params) {
+    LMKD_CTRL_PACKET packet;
+    size_t size;
+    int ret;
+
+    size = lmkd_pack_set_procremove(packet, params);
+    ret = TEMP_FAILURE_RETRY(write(sock, packet, size));
+
+    return (ret < 0) ? -1 : 0;
+}
+
 int create_memcg(uid_t uid, pid_t pid) {
     char buf[256];
     int tasks_file;