a92de71a51
(cherry pick from commit 0f10051805)
A number of tools and tests require communication with lmkd.
In order to avoid code duplication liblmkd_utils implements
functions commonly used when interacting with lmkd process.
Isolate communication protocol details into lmkd.h
Bug: 63631020
Change-Id: Id840983d55b7db60013d52dee0c3187943811822
Merged-In: Id840983d55b7db60013d52dee0c3187943811822
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/*
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* Copyright 2018 Google, Inc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/cdefs.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <liblmkd_utils.h>
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#include <cutils/sockets.h>
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int lmkd_connect() {
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return socket_local_client("lmkd",
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ANDROID_SOCKET_NAMESPACE_RESERVED,
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SOCK_SEQPACKET);
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}
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int lmkd_register_proc(int sock, struct lmk_procprio *params) {
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LMKD_CTRL_PACKET packet;
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size_t size;
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int ret;
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size = lmkd_pack_set_procprio(packet, params);
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ret = TEMP_FAILURE_RETRY(write(sock, packet, size));
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return (ret < 0) ? -1 : 0;
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}
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int create_memcg(uid_t uid, pid_t pid) {
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char buf[256];
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int tasks_file;
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int written;
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snprintf(buf, sizeof(buf), "/dev/memcg/apps/uid_%u", uid);
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if (mkdir(buf, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH) < 0 &&
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errno != EEXIST) {
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return -1;
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}
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snprintf(buf, sizeof(buf), "/dev/memcg/apps/uid_%u/pid_%u", uid, pid);
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if (mkdir(buf, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH) < 0 &&
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errno != EEXIST) {
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return -1;
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}
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snprintf(buf, sizeof(buf), "/dev/memcg/apps/uid_%u/pid_%u/tasks", uid, pid);
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tasks_file = open(buf, O_WRONLY);
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if (tasks_file < 0) {
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return -2;
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}
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written = snprintf(buf, sizeof(buf), "%u", pid);
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if (__predict_false(written >= (int)sizeof(buf))) {
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written = sizeof(buf) - 1;
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}
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written = TEMP_FAILURE_RETRY(write(tasks_file, buf, written));
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close(tasks_file);
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return (written < 0) ? -3 : 0;
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}
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