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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/process/set_process_title_linux.h"
#include <string.h>
#include <unistd.h>
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/strings/string_util.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#if BUILDFLAG(IS_CHROMEOS)
#include "base/profiler/module_cache.h"
#endif
namespace {
const std::string kNullChr(1, '\0');
std::string ReadCmdline() {
std::string cmdline;
CHECK(base::ReadFileToString(base::FilePath("/proc/self/cmdline"), &cmdline));
// The process title appears in different formats depending on Linux kernel
// version:
// "title" (on Linux --4.17)
// "title\0\0\0...\0" (on Linux 4.18--5.2)
// "title\0" (on Linux 5.3--)
//
// For unit tests, just trim trailing null characters to support all cases.
return std::string(base::TrimString(cmdline, kNullChr, base::TRIM_TRAILING));
}
TEST(SetProcTitleLinuxTest, Simple) {
setproctitle("a %s cat", "cute");
EXPECT_TRUE(base::EndsWith(ReadCmdline(), " a cute cat",
base::CompareCase::SENSITIVE))
<< ReadCmdline();
setproctitle("-a %s cat", "cute");
EXPECT_EQ(ReadCmdline(), "a cute cat");
}
TEST(SetProcTitleLinuxTest, Empty) {
setproctitle("-");
EXPECT_EQ(ReadCmdline(), "");
}
TEST(SetProcTitleLinuxTest, Long) {
setproctitle("-long cat is l%0100000dng", 0);
EXPECT_TRUE(base::StartsWith(ReadCmdline(), "long cat is l00000000",
base::CompareCase::SENSITIVE))
<< ReadCmdline();
}
#if BUILDFLAG(IS_CHROMEOS)
TEST(SetProcTitleLinuxTest, GetModuleForAddressWorksWithSetProcTitle) {
// Ensure that after calling setproctitle(), GetModuleForAddress() returns a
// Module with a valid GetDebugBasename(), not something that includes all the
// command-line flags. The code we're testing is actually in
// base/profiler/module_cache_posix.cc, but we need to test it here for
// dependencies.
setproctitle("%s", "/opt/google/chrome/chrome --type=renderer --foo=bar");
base::ModuleCache module_cache;
// We're assuming the code in this file is linked into the main unittest
// binary not a shared library.
const base::ModuleCache::Module* module = module_cache.GetModuleForAddress(
reinterpret_cast<uintptr_t>(&ReadCmdline));
ASSERT_NE(module, nullptr);
EXPECT_EQ(module->GetDebugBasename().value(), "chrome");
}
#endif // BUILDFLAG(IS_CHROMEOS)
} // namespace
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