Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2018 Google, Inc |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <errno.h> |
| 18 | #include <fcntl.h> |
| 19 | #include <sys/cdefs.h> |
| 20 | #include <sys/stat.h> |
| 21 | #include <sys/types.h> |
| 22 | #include <stdio.h> |
| 23 | #include <unistd.h> |
| 24 | |
| 25 | #include <liblmkd_utils.h> |
| 26 | #include <cutils/sockets.h> |
| 27 | |
| 28 | int lmkd_connect() { |
| 29 | return socket_local_client("lmkd", |
| 30 | ANDROID_SOCKET_NAMESPACE_RESERVED, |
| 31 | SOCK_SEQPACKET); |
| 32 | } |
| 33 | |
| 34 | int lmkd_register_proc(int sock, struct lmk_procprio *params) { |
| 35 | LMKD_CTRL_PACKET packet; |
| 36 | size_t size; |
| 37 | int ret; |
| 38 | |
| 39 | size = lmkd_pack_set_procprio(packet, params); |
| 40 | ret = TEMP_FAILURE_RETRY(write(sock, packet, size)); |
| 41 | |
| 42 | return (ret < 0) ? -1 : 0; |
| 43 | } |
| 44 | |
| 45 | int create_memcg(uid_t uid, pid_t pid) { |
| 46 | char buf[256]; |
| 47 | int tasks_file; |
| 48 | int written; |
| 49 | |
| 50 | snprintf(buf, sizeof(buf), "/dev/memcg/apps/uid_%u", uid); |
| 51 | if (mkdir(buf, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH) < 0 && |
| 52 | errno != EEXIST) { |
| 53 | return -1; |
| 54 | } |
| 55 | |
| 56 | snprintf(buf, sizeof(buf), "/dev/memcg/apps/uid_%u/pid_%u", uid, pid); |
| 57 | if (mkdir(buf, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH) < 0 && |
| 58 | errno != EEXIST) { |
| 59 | return -1; |
| 60 | } |
| 61 | |
| 62 | snprintf(buf, sizeof(buf), "/dev/memcg/apps/uid_%u/pid_%u/tasks", uid, pid); |
| 63 | tasks_file = open(buf, O_WRONLY); |
| 64 | if (tasks_file < 0) { |
| 65 | return -2; |
| 66 | } |
| 67 | written = snprintf(buf, sizeof(buf), "%u", pid); |
| 68 | if (__predict_false(written >= (int)sizeof(buf))) { |
| 69 | written = sizeof(buf) - 1; |
| 70 | } |
| 71 | written = TEMP_FAILURE_RETRY(write(tasks_file, buf, written)); |
| 72 | close(tasks_file); |
| 73 | |
| 74 | return (written < 0) ? -3 : 0; |
| 75 | } |
| 76 | |