src/Process.cpp

/*
 * Copyright (C) 2024 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 <filesystem>
#include <iostream>
#include <string>

#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/properties.h>
#include <android-base/strings.h>
#include <android_uprobestats_flags.h>
#include <config.pb.h>
#include <json/json.h>

namespace android {
namespace uprobestats {
namespace process {

int getPid(const std::string &processName) {
  for (const auto &entry : std::filesystem::directory_iterator("/proc")) {
    std::string cmdline;
    android::base::ReadFileToString(entry.path() / "cmdline", &cmdline);
    if (android::base::ReadFileToString(entry.path() / "cmdline", &cmdline) &&
        (cmdline == processName ||
         (cmdline.rfind(processName + '\0', 0) == 0))) {
      std::string pidStr =
          entry.path().string().substr(entry.path().string().rfind("/") + 1);
      int pid;
      if (!android::base::ParseInt(pidStr, &pid)) {
        return -1;
      }
      return pid;
    }
  }
  return -1;
}

} // namespace process
} // namespace uprobestats
} // namespace android