5f036ab89b
So users can decide whether to print error msg or not. Bug: none Test: run libprocinfo_test. Change-Id: Ie1afcb58cb97493c7ffade6841b6eb7a800a3981
136 lines
3.7 KiB
C++
136 lines
3.7 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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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 <procinfo/process.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <string>
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#include <android-base/unique_fd.h>
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using android::base::unique_fd;
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namespace android {
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namespace procinfo {
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bool GetProcessInfo(pid_t tid, ProcessInfo* process_info, std::string* error) {
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char path[PATH_MAX];
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snprintf(path, sizeof(path), "/proc/%d", tid);
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unique_fd dirfd(open(path, O_DIRECTORY | O_RDONLY));
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if (dirfd == -1) {
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if (error != nullptr) {
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*error = std::string("failed to open ") + path;
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}
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return false;
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}
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return GetProcessInfoFromProcPidFd(dirfd.get(), process_info, error);
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}
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static ProcessState parse_state(const char* state) {
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switch (*state) {
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case 'R':
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return kProcessStateRunning;
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case 'S':
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return kProcessStateSleeping;
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case 'D':
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return kProcessStateUninterruptibleWait;
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case 'T':
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return kProcessStateStopped;
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case 'Z':
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return kProcessStateZombie;
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default:
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LOG(ERROR) << "unknown process state: " << *state;
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return kProcessStateUnknown;
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}
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}
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bool GetProcessInfoFromProcPidFd(int fd, ProcessInfo* process_info, std::string* error) {
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int status_fd = openat(fd, "status", O_RDONLY | O_CLOEXEC);
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if (status_fd == -1) {
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if (error != nullptr) {
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*error = "failed to open status fd in GetProcessInfoFromProcPidFd";
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}
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return false;
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}
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std::unique_ptr<FILE, decltype(&fclose)> fp(fdopen(status_fd, "r"), fclose);
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if (!fp) {
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if (error != nullptr) {
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*error = "failed to open status file in GetProcessInfoFromProcPidFd";
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}
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close(status_fd);
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return false;
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}
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int field_bitmap = 0;
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static constexpr int finished_bitmap = 255;
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char* line = nullptr;
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size_t len = 0;
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while (getline(&line, &len, fp.get()) != -1 && field_bitmap != finished_bitmap) {
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char* tab = strchr(line, '\t');
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if (tab == nullptr) {
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continue;
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}
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size_t header_len = tab - line;
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std::string header = std::string(line, header_len);
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if (header == "Name:") {
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std::string name = line + header_len + 1;
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// line includes the trailing newline.
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name.pop_back();
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process_info->name = std::move(name);
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field_bitmap |= 1;
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} else if (header == "Pid:") {
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process_info->tid = atoi(tab + 1);
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field_bitmap |= 2;
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} else if (header == "Tgid:") {
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process_info->pid = atoi(tab + 1);
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field_bitmap |= 4;
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} else if (header == "PPid:") {
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process_info->ppid = atoi(tab + 1);
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field_bitmap |= 8;
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} else if (header == "TracerPid:") {
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process_info->tracer = atoi(tab + 1);
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field_bitmap |= 16;
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} else if (header == "Uid:") {
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process_info->uid = atoi(tab + 1);
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field_bitmap |= 32;
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} else if (header == "Gid:") {
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process_info->gid = atoi(tab + 1);
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field_bitmap |= 64;
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} else if (header == "State:") {
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process_info->state = parse_state(tab + 1);
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field_bitmap |= 128;
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}
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}
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free(line);
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return field_bitmap == finished_bitmap;
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}
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} /* namespace procinfo */
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} /* namespace android */
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