commit 1d0ebeaa9c0d7410c347622ccf16942efde0c20c
author Suren Baghdasaryan <surenb@google.com> Tue Apr 28 15:52:29 2020 -0700
committer Suren Baghdasaryan <surenb@google.com> Wed May 06 15:05:04 2020 -0700
tree 8070241dca3f84519792da7d8250bae07b54efe9
parent 03dccf35a18618e21050975dd707eecbd4493f11

lmkd: Add property re-initialization support

Add --reinit command-line option to allow updating lmkd properties. For
example to enable debug logging in the running lmkd process user should
issue:

setprop ro.lmk.debug true
lmkd --reinit

Bug: 155149944
Test: lmkd_unit_test after resetting lmkd properties
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: Ic60331f3368f5a7fdfe09ad7d47c7ccf0a497685

liblmkd_utils.cpp

diff --git a/liblmkd_utils.cpp b/liblmkd_utils.cpp
index 280c149..45e867e 100644
--- a/liblmkd_utils.cpp
+++ b/liblmkd_utils.cpp
@@ -53,6 +53,30 @@
     return (ret < 0) ? -1 : 0;
 }
 
+enum update_props_result lmkd_update_props(int sock) {
+    LMKD_CTRL_PACKET packet;
+    size_t size;
+
+    size = lmkd_pack_set_update_props(packet);
+    if (TEMP_FAILURE_RETRY(write(sock, packet, size)) < 0) {
+        return UPDATE_PROPS_SEND_ERR;
+    }
+
+    size = TEMP_FAILURE_RETRY(read(sock, packet, CTRL_PACKET_MAX_SIZE));
+    if (size < 0) {
+        return UPDATE_PROPS_RECV_ERR;
+    }
+
+    if (size != 2 * sizeof(int) || lmkd_pack_get_cmd(packet) != LMK_UPDATE_PROPS) {
+        return UPDATE_PROPS_FORMAT_ERR;
+    }
+
+    struct lmk_update_props_reply params;
+    lmkd_pack_get_update_props_repl(packet, &params);
+
+    return params.result == 0 ? UPDATE_PROPS_SUCCESS : UPDATE_PROPS_FAIL;
+}
+
 int create_memcg(uid_t uid, pid_t pid) {
     char buf[256];
     int tasks_file;