Josh Gao | 911d729 | 2016-10-28 15:23:25 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 The Android Open Source Project |
| 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 <procinfo/process.h> |
| 18 | |
| 19 | #include <fcntl.h> |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | #include <unistd.h> |
| 24 | |
| 25 | #include <string> |
| 26 | |
| 27 | #include <android-base/unique_fd.h> |
| 28 | |
| 29 | using android::base::unique_fd; |
| 30 | |
| 31 | namespace android { |
| 32 | namespace procinfo { |
| 33 | |
Yabin Cui | 5f036ab | 2018-07-24 10:52:25 -0700 | [diff] [blame] | 34 | bool GetProcessInfo(pid_t tid, ProcessInfo* process_info, std::string* error) { |
Josh Gao | 911d729 | 2016-10-28 15:23:25 -0700 | [diff] [blame] | 35 | char path[PATH_MAX]; |
| 36 | snprintf(path, sizeof(path), "/proc/%d", tid); |
| 37 | |
| 38 | unique_fd dirfd(open(path, O_DIRECTORY | O_RDONLY)); |
| 39 | if (dirfd == -1) { |
Yabin Cui | 5f036ab | 2018-07-24 10:52:25 -0700 | [diff] [blame] | 40 | if (error != nullptr) { |
| 41 | *error = std::string("failed to open ") + path; |
| 42 | } |
Josh Gao | 911d729 | 2016-10-28 15:23:25 -0700 | [diff] [blame] | 43 | return false; |
| 44 | } |
| 45 | |
Yabin Cui | 5f036ab | 2018-07-24 10:52:25 -0700 | [diff] [blame] | 46 | return GetProcessInfoFromProcPidFd(dirfd.get(), process_info, error); |
Josh Gao | 911d729 | 2016-10-28 15:23:25 -0700 | [diff] [blame] | 47 | } |
| 48 | |
Josh Gao | 9cb2e2e | 2017-06-27 14:06:19 -0700 | [diff] [blame] | 49 | static ProcessState parse_state(const char* state) { |
| 50 | switch (*state) { |
| 51 | case 'R': |
| 52 | return kProcessStateRunning; |
| 53 | case 'S': |
| 54 | return kProcessStateSleeping; |
| 55 | case 'D': |
| 56 | return kProcessStateUninterruptibleWait; |
| 57 | case 'T': |
| 58 | return kProcessStateStopped; |
| 59 | case 'Z': |
| 60 | return kProcessStateZombie; |
| 61 | default: |
Josh Gao | 9cb2e2e | 2017-06-27 14:06:19 -0700 | [diff] [blame] | 62 | return kProcessStateUnknown; |
| 63 | } |
| 64 | } |
| 65 | |
Yabin Cui | 5f036ab | 2018-07-24 10:52:25 -0700 | [diff] [blame] | 66 | bool GetProcessInfoFromProcPidFd(int fd, ProcessInfo* process_info, std::string* error) { |
Josh Gao | 911d729 | 2016-10-28 15:23:25 -0700 | [diff] [blame] | 67 | int status_fd = openat(fd, "status", O_RDONLY | O_CLOEXEC); |
| 68 | |
| 69 | if (status_fd == -1) { |
Yabin Cui | 5f036ab | 2018-07-24 10:52:25 -0700 | [diff] [blame] | 70 | if (error != nullptr) { |
| 71 | *error = "failed to open status fd in GetProcessInfoFromProcPidFd"; |
| 72 | } |
Josh Gao | 911d729 | 2016-10-28 15:23:25 -0700 | [diff] [blame] | 73 | return false; |
| 74 | } |
| 75 | |
| 76 | std::unique_ptr<FILE, decltype(&fclose)> fp(fdopen(status_fd, "r"), fclose); |
| 77 | if (!fp) { |
Yabin Cui | 5f036ab | 2018-07-24 10:52:25 -0700 | [diff] [blame] | 78 | if (error != nullptr) { |
| 79 | *error = "failed to open status file in GetProcessInfoFromProcPidFd"; |
| 80 | } |
Josh Gao | 911d729 | 2016-10-28 15:23:25 -0700 | [diff] [blame] | 81 | close(status_fd); |
| 82 | return false; |
| 83 | } |
| 84 | |
| 85 | int field_bitmap = 0; |
Josh Gao | 9cb2e2e | 2017-06-27 14:06:19 -0700 | [diff] [blame] | 86 | static constexpr int finished_bitmap = 255; |
Josh Gao | 911d729 | 2016-10-28 15:23:25 -0700 | [diff] [blame] | 87 | char* line = nullptr; |
| 88 | size_t len = 0; |
| 89 | |
| 90 | while (getline(&line, &len, fp.get()) != -1 && field_bitmap != finished_bitmap) { |
| 91 | char* tab = strchr(line, '\t'); |
| 92 | if (tab == nullptr) { |
| 93 | continue; |
| 94 | } |
| 95 | |
| 96 | size_t header_len = tab - line; |
| 97 | std::string header = std::string(line, header_len); |
| 98 | if (header == "Name:") { |
| 99 | std::string name = line + header_len + 1; |
| 100 | |
| 101 | // line includes the trailing newline. |
| 102 | name.pop_back(); |
| 103 | process_info->name = std::move(name); |
| 104 | |
| 105 | field_bitmap |= 1; |
| 106 | } else if (header == "Pid:") { |
| 107 | process_info->tid = atoi(tab + 1); |
| 108 | field_bitmap |= 2; |
| 109 | } else if (header == "Tgid:") { |
| 110 | process_info->pid = atoi(tab + 1); |
| 111 | field_bitmap |= 4; |
| 112 | } else if (header == "PPid:") { |
| 113 | process_info->ppid = atoi(tab + 1); |
| 114 | field_bitmap |= 8; |
| 115 | } else if (header == "TracerPid:") { |
| 116 | process_info->tracer = atoi(tab + 1); |
| 117 | field_bitmap |= 16; |
| 118 | } else if (header == "Uid:") { |
| 119 | process_info->uid = atoi(tab + 1); |
| 120 | field_bitmap |= 32; |
| 121 | } else if (header == "Gid:") { |
| 122 | process_info->gid = atoi(tab + 1); |
| 123 | field_bitmap |= 64; |
Josh Gao | 9cb2e2e | 2017-06-27 14:06:19 -0700 | [diff] [blame] | 124 | } else if (header == "State:") { |
| 125 | process_info->state = parse_state(tab + 1); |
| 126 | field_bitmap |= 128; |
Josh Gao | 911d729 | 2016-10-28 15:23:25 -0700 | [diff] [blame] | 127 | } |
| 128 | } |
| 129 | |
| 130 | free(line); |
| 131 | return field_bitmap == finished_bitmap; |
| 132 | } |
| 133 | |
| 134 | } /* namespace procinfo */ |
| 135 | } /* namespace android */ |