110 lines
3.0 KiB
C++
110 lines
3.0 KiB
C++
|
/*
|
||
|
|
* Copyright (C) 2016 The Android Open Source Project
|
||
|
|
*
|
||
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
* you may not use this file except in compliance with the License.
|
||
|
|
* You may obtain a copy of the License at
|
||
|
|
*
|
||
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
*
|
||
|
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
* See the License for the specific language governing permissions and
|
||
|
|
* limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <procinfo/process.h>
|
||
|
|
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
#include <string>
|
||
|
|
|
||
|
|
#include <android-base/unique_fd.h>
|
||
|
|
|
||
|
|
using android::base::unique_fd;
|
||
|
|
|
||
|
|
namespace android {
|
||
|
|
namespace procinfo {
|
||
|
|
|
||
|
|
bool GetProcessInfo(pid_t tid, ProcessInfo* process_info) {
|
||
|
|
char path[PATH_MAX];
|
||
|
|
snprintf(path, sizeof(path), "/proc/%d", tid);
|
||
|
|
|
||
|
|
unique_fd dirfd(open(path, O_DIRECTORY | O_RDONLY));
|
||
|
|
if (dirfd == -1) {
|
||
|
|
PLOG(ERROR) << "failed to open " << path;
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
return GetProcessInfoFromProcPidFd(dirfd.get(), process_info);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool GetProcessInfoFromProcPidFd(int fd, ProcessInfo* process_info) {
|
||
|
|
int status_fd = openat(fd, "status", O_RDONLY | O_CLOEXEC);
|
||
|
|
|
||
|
|
if (status_fd == -1) {
|
||
|
|
PLOG(ERROR) << "failed to open status fd in GetProcessInfoFromProcPidFd";
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
std::unique_ptr<FILE, decltype(&fclose)> fp(fdopen(status_fd, "r"), fclose);
|
||
|
|
if (!fp) {
|
||
|
|
PLOG(ERROR) << "failed to open status file in GetProcessInfoFromProcPidFd";
|
||
|
|
close(status_fd);
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
int field_bitmap = 0;
|
||
|
|
static constexpr int finished_bitmap = 127;
|
||
|
|
char* line = nullptr;
|
||
|
|
size_t len = 0;
|
||
|
|
|
||
|
|
while (getline(&line, &len, fp.get()) != -1 && field_bitmap != finished_bitmap) {
|
||
|
|
char* tab = strchr(line, '\t');
|
||
|
|
if (tab == nullptr) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
size_t header_len = tab - line;
|
||
|
|
std::string header = std::string(line, header_len);
|
||
|
|
if (header == "Name:") {
|
||
|
|
std::string name = line + header_len + 1;
|
||
|
|
|
||
|
|
// line includes the trailing newline.
|
||
|
|
name.pop_back();
|
||
|
|
process_info->name = std::move(name);
|
||
|
|
|
||
|
|
field_bitmap |= 1;
|
||
|
|
} else if (header == "Pid:") {
|
||
|
|
process_info->tid = atoi(tab + 1);
|
||
|
|
field_bitmap |= 2;
|
||
|
|
} else if (header == "Tgid:") {
|
||
|
|
process_info->pid = atoi(tab + 1);
|
||
|
|
field_bitmap |= 4;
|
||
|
|
} else if (header == "PPid:") {
|
||
|
|
process_info->ppid = atoi(tab + 1);
|
||
|
|
field_bitmap |= 8;
|
||
|
|
} else if (header == "TracerPid:") {
|
||
|
|
process_info->tracer = atoi(tab + 1);
|
||
|
|
field_bitmap |= 16;
|
||
|
|
} else if (header == "Uid:") {
|
||
|
|
process_info->uid = atoi(tab + 1);
|
||
|
|
field_bitmap |= 32;
|
||
|
|
} else if (header == "Gid:") {
|
||
|
|
process_info->gid = atoi(tab + 1);
|
||
|
|
field_bitmap |= 64;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
free(line);
|
||
|
|
return field_bitmap == finished_bitmap;
|
||
|
|
}
|
||
|
|
|
||
|
|
} /* namespace procinfo */
|
||
|
|
} /* namespace android */
|