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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/common/set_process_title.h"
#include "build/build_config.h"
#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_SOLARIS)
#include <limits.h>
#include <stdlib.h>
#include <unistd.h>
#include <string>
#include "base/command_line.h"
#endif // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_SOLARIS)
#if defined(OS_LINUX)
#include <sys/prctl.h>
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/process/process_metrics.h"
#include "base/strings/string_util.h"
#include "base/threading/platform_thread.h"
// Linux/glibc doesn't natively have setproctitle().
#include "content/common/set_process_title_linux.h"
#endif // defined(OS_LINUX)
namespace content {
// TODO(jrg): Find out if setproctitle or equivalent is available on Android.
#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_SOLARIS) && \
!defined(OS_ANDROID)
void SetProcessTitleFromCommandLine(const char** main_argv) {
// Build a single string which consists of all the arguments separated
// by spaces. We can't actually keep them separate due to the way the
// setproctitle() function works.
std::string title;
bool have_argv0 = false;
#if defined(OS_LINUX)
DCHECK_EQ(base::PlatformThread::CurrentId(), getpid());
if (main_argv)
setproctitle_init(main_argv);
// In Linux we sometimes exec ourselves from /proc/self/exe, but this makes us
// show up as "exe" in process listings. Read the symlink /proc/self/exe and
// use the path it points at for our process title. Note that this is only for
// display purposes and has no TOCTTOU security implications.
base::FilePath target;
base::FilePath self_exe(base::kProcSelfExe);
if (base::ReadSymbolicLink(self_exe, &target)) {
have_argv0 = true;
title = target.value();
// If the binary has since been deleted, Linux appends " (deleted)" to the
// symlink target. Remove it, since this is not really part of our name.
const std::string kDeletedSuffix = " (deleted)";
if (base::EndsWith(title, kDeletedSuffix, true))
title.resize(title.size() - kDeletedSuffix.size());
// PR_SET_NAME is available in Linux 2.6.9 and newer.
// When available at run time, this sets the short process name that shows
// when the full command line is not being displayed in most process
// listings.
prctl(PR_SET_NAME, base::FilePath(title).BaseName().value().c_str());
}
#endif // defined(OS_LINUX)
const base::CommandLine* command_line =
base::CommandLine::ForCurrentProcess();
for (size_t i = 1; i < command_line->argv().size(); ++i) {
if (!title.empty())
title += " ";
title += command_line->argv()[i];
}
// Disable prepending argv[0] with '-' if we prepended it ourselves above.
setproctitle(have_argv0 ? "-%s" : "%s", title.c_str());
}
#else
// All other systems (basically Windows & Mac) have no need or way to implement
// this function.
void SetProcessTitleFromCommandLine(const char** /* main_argv */) {
}
#endif
} // namespace content
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