1b812f9cd6
Currently, calls to Host::SystemLog print to stderr on all host platforms except Darwin. This severely limits its value on the command line, where we don't want to overload the user with log messages. Switch to using the syslog function on POSIX systems to send messages to the system logger instead of stdout. On Darwin systems this sends the log message to os_log, which matches what we do today. Nevertheless I kept the current implementation that uses os_log directly as it gives us more freedom. I'm not sure if there's an equivalent on Windows, so I kept the existing behavior of logging to stderr.
634 lines
19 KiB
C++
634 lines
19 KiB
C++
//===-- Host.cpp ----------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// C includes
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#include <cerrno>
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#include <climits>
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#include <cstdlib>
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#include <sys/types.h>
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#ifndef _WIN32
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#include <dlfcn.h>
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#include <grp.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#endif
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#if defined(__APPLE__)
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#include <mach-o/dyld.h>
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#include <mach/mach_init.h>
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#include <mach/mach_port.h>
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#endif
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#if defined(__linux__) || defined(__FreeBSD__) || \
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defined(__FreeBSD_kernel__) || defined(__APPLE__) || \
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defined(__NetBSD__) || defined(__OpenBSD__) || defined(__EMSCRIPTEN__)
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#if !defined(__ANDROID__)
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#include <spawn.h>
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#endif
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#include <sys/syscall.h>
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#include <sys/wait.h>
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#endif
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#if defined(__FreeBSD__)
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#include <pthread_np.h>
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#endif
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#if defined(__NetBSD__)
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#include <lwp.h>
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#endif
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#include <csignal>
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#include "lldb/Host/FileAction.h"
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#include "lldb/Host/FileSystem.h"
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#include "lldb/Host/Host.h"
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#include "lldb/Host/HostInfo.h"
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#include "lldb/Host/HostProcess.h"
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#include "lldb/Host/MonitoringProcessLauncher.h"
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#include "lldb/Host/ProcessLaunchInfo.h"
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#include "lldb/Host/ProcessLauncher.h"
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#include "lldb/Host/ThreadLauncher.h"
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#include "lldb/Host/posix/ConnectionFileDescriptorPosix.h"
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#include "lldb/Utility/FileSpec.h"
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#include "lldb/Utility/LLDBLog.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/Predicate.h"
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#include "lldb/Utility/Status.h"
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#include "lldb/lldb-private-forward.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/Errno.h"
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#include "llvm/Support/FileSystem.h"
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#if defined(_WIN32)
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#include "lldb/Host/windows/ConnectionGenericFileWindows.h"
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#include "lldb/Host/windows/ProcessLauncherWindows.h"
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#else
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#include "lldb/Host/posix/ProcessLauncherPosixFork.h"
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#endif
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#if defined(__APPLE__)
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#ifndef _POSIX_SPAWN_DISABLE_ASLR
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#define _POSIX_SPAWN_DISABLE_ASLR 0x0100
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#endif
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extern "C" {
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int __pthread_chdir(const char *path);
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int __pthread_fchdir(int fildes);
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}
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#endif
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using namespace lldb;
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using namespace lldb_private;
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#if !defined(__APPLE__)
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#if !defined(_WIN32)
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#include <syslog.h>
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void Host::SystemLog(llvm::StringRef message) {
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static llvm::once_flag g_openlog_once;
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llvm::call_once(g_openlog_once, [] {
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openlog("lldb", LOG_CONS | LOG_PID | LOG_NDELAY, LOG_USER);
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});
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syslog(LOG_INFO, "%s", message.data());
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}
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#else
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void Host::SystemLog(llvm::StringRef message) { llvm::errs() << message; }
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#endif
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#endif
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#if !defined(__APPLE__) && !defined(_WIN32)
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static thread_result_t
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MonitorChildProcessThreadFunction(::pid_t pid,
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Host::MonitorChildProcessCallback callback);
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llvm::Expected<HostThread> Host::StartMonitoringChildProcess(
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const Host::MonitorChildProcessCallback &callback, lldb::pid_t pid) {
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char thread_name[256];
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::snprintf(thread_name, sizeof(thread_name),
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"<lldb.host.wait4(pid=%" PRIu64 ")>", pid);
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assert(pid <= UINT32_MAX);
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return ThreadLauncher::LaunchThread(thread_name, [pid, callback] {
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return MonitorChildProcessThreadFunction(pid, callback);
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});
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}
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#ifndef __linux__
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// Scoped class that will disable thread canceling when it is constructed, and
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// exception safely restore the previous value it when it goes out of scope.
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class ScopedPThreadCancelDisabler {
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public:
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ScopedPThreadCancelDisabler() {
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// Disable the ability for this thread to be cancelled
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int err = ::pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &m_old_state);
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if (err != 0)
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m_old_state = -1;
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}
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~ScopedPThreadCancelDisabler() {
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// Restore the ability for this thread to be cancelled to what it
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// previously was.
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if (m_old_state != -1)
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::pthread_setcancelstate(m_old_state, 0);
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}
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private:
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int m_old_state; // Save the old cancelability state.
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};
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#endif // __linux__
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#ifdef __linux__
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static thread_local volatile sig_atomic_t g_usr1_called;
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static void SigUsr1Handler(int) { g_usr1_called = 1; }
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#endif // __linux__
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static bool CheckForMonitorCancellation() {
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#ifdef __linux__
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if (g_usr1_called) {
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g_usr1_called = 0;
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return true;
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}
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#else
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::pthread_testcancel();
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#endif
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return false;
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}
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static thread_result_t
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MonitorChildProcessThreadFunction(::pid_t pid,
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Host::MonitorChildProcessCallback callback) {
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Log *log = GetLog(LLDBLog::Process);
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LLDB_LOG(log, "pid = {0}", pid);
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int status = -1;
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#ifdef __linux__
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// This signal is only used to interrupt the thread from waitpid
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struct sigaction sigUsr1Action;
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memset(&sigUsr1Action, 0, sizeof(sigUsr1Action));
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sigUsr1Action.sa_handler = SigUsr1Handler;
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::sigaction(SIGUSR1, &sigUsr1Action, nullptr);
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#endif // __linux__
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while (true) {
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log = GetLog(LLDBLog::Process);
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LLDB_LOG(log, "::waitpid({0}, &status, 0)...", pid);
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if (CheckForMonitorCancellation())
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return nullptr;
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const ::pid_t wait_pid = ::waitpid(pid, &status, 0);
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LLDB_LOG(log, "::waitpid({0}, &status, 0) => pid = {1}, status = {2:x}", pid,
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wait_pid, status);
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if (CheckForMonitorCancellation())
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return nullptr;
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if (wait_pid != -1)
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break;
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if (errno != EINTR) {
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LLDB_LOG(log, "pid = {0}, thread exiting because waitpid failed ({1})...",
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pid, llvm::sys::StrError());
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return nullptr;
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}
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}
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int signal = 0;
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int exit_status = 0;
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if (WIFEXITED(status)) {
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exit_status = WEXITSTATUS(status);
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} else if (WIFSIGNALED(status)) {
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signal = WTERMSIG(status);
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exit_status = -1;
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} else {
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llvm_unreachable("Unknown status");
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}
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// Scope for pthread_cancel_disabler
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{
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#ifndef __linux__
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ScopedPThreadCancelDisabler pthread_cancel_disabler;
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#endif
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if (callback)
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callback(pid, signal, exit_status);
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}
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LLDB_LOG(GetLog(LLDBLog::Process), "pid = {0} thread exiting...", pid);
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return nullptr;
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}
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#endif // #if !defined (__APPLE__) && !defined (_WIN32)
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lldb::pid_t Host::GetCurrentProcessID() { return ::getpid(); }
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#ifndef _WIN32
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lldb::thread_t Host::GetCurrentThread() {
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return lldb::thread_t(pthread_self());
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}
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const char *Host::GetSignalAsCString(int signo) {
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switch (signo) {
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case SIGHUP:
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return "SIGHUP"; // 1 hangup
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case SIGINT:
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return "SIGINT"; // 2 interrupt
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case SIGQUIT:
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return "SIGQUIT"; // 3 quit
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case SIGILL:
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return "SIGILL"; // 4 illegal instruction (not reset when caught)
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case SIGTRAP:
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return "SIGTRAP"; // 5 trace trap (not reset when caught)
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case SIGABRT:
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return "SIGABRT"; // 6 abort()
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#if defined(SIGPOLL)
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#if !defined(SIGIO) || (SIGPOLL != SIGIO)
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// Under some GNU/Linux, SIGPOLL and SIGIO are the same. Causing the build to
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// fail with 'multiple define cases with same value'
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case SIGPOLL:
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return "SIGPOLL"; // 7 pollable event ([XSR] generated, not supported)
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#endif
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#endif
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#if defined(SIGEMT)
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case SIGEMT:
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return "SIGEMT"; // 7 EMT instruction
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#endif
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case SIGFPE:
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return "SIGFPE"; // 8 floating point exception
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case SIGKILL:
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return "SIGKILL"; // 9 kill (cannot be caught or ignored)
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case SIGBUS:
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return "SIGBUS"; // 10 bus error
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case SIGSEGV:
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return "SIGSEGV"; // 11 segmentation violation
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case SIGSYS:
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return "SIGSYS"; // 12 bad argument to system call
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case SIGPIPE:
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return "SIGPIPE"; // 13 write on a pipe with no one to read it
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case SIGALRM:
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return "SIGALRM"; // 14 alarm clock
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case SIGTERM:
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return "SIGTERM"; // 15 software termination signal from kill
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case SIGURG:
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return "SIGURG"; // 16 urgent condition on IO channel
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case SIGSTOP:
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return "SIGSTOP"; // 17 sendable stop signal not from tty
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case SIGTSTP:
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return "SIGTSTP"; // 18 stop signal from tty
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case SIGCONT:
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return "SIGCONT"; // 19 continue a stopped process
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case SIGCHLD:
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return "SIGCHLD"; // 20 to parent on child stop or exit
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case SIGTTIN:
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return "SIGTTIN"; // 21 to readers pgrp upon background tty read
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case SIGTTOU:
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return "SIGTTOU"; // 22 like TTIN for output if (tp->t_local<OSTOP)
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#if defined(SIGIO)
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case SIGIO:
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return "SIGIO"; // 23 input/output possible signal
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#endif
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case SIGXCPU:
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return "SIGXCPU"; // 24 exceeded CPU time limit
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case SIGXFSZ:
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return "SIGXFSZ"; // 25 exceeded file size limit
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case SIGVTALRM:
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return "SIGVTALRM"; // 26 virtual time alarm
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case SIGPROF:
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return "SIGPROF"; // 27 profiling time alarm
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#if defined(SIGWINCH)
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case SIGWINCH:
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return "SIGWINCH"; // 28 window size changes
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#endif
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#if defined(SIGINFO)
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case SIGINFO:
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return "SIGINFO"; // 29 information request
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#endif
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case SIGUSR1:
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return "SIGUSR1"; // 30 user defined signal 1
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case SIGUSR2:
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return "SIGUSR2"; // 31 user defined signal 2
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default:
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break;
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}
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return nullptr;
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}
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#endif
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#if !defined(__APPLE__) // see Host.mm
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bool Host::GetBundleDirectory(const FileSpec &file, FileSpec &bundle) {
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bundle.Clear();
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return false;
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}
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bool Host::ResolveExecutableInBundle(FileSpec &file) { return false; }
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#endif
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#ifndef _WIN32
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FileSpec Host::GetModuleFileSpecForHostAddress(const void *host_addr) {
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FileSpec module_filespec;
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#if !defined(__ANDROID__)
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Dl_info info;
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if (::dladdr(host_addr, &info)) {
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if (info.dli_fname) {
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module_filespec.SetFile(info.dli_fname, FileSpec::Style::native);
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FileSystem::Instance().Resolve(module_filespec);
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}
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}
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#endif
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return module_filespec;
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}
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#endif
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#if !defined(__linux__)
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bool Host::FindProcessThreads(const lldb::pid_t pid, TidMap &tids_to_attach) {
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return false;
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}
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#endif
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struct ShellInfo {
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ShellInfo() : process_reaped(false) {}
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lldb_private::Predicate<bool> process_reaped;
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lldb::pid_t pid = LLDB_INVALID_PROCESS_ID;
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int signo = -1;
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int status = -1;
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};
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static void
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MonitorShellCommand(std::shared_ptr<ShellInfo> shell_info, lldb::pid_t pid,
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int signo, // Zero for no signal
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int status) // Exit value of process if signal is zero
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{
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shell_info->pid = pid;
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shell_info->signo = signo;
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shell_info->status = status;
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// Let the thread running Host::RunShellCommand() know that the process
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// exited and that ShellInfo has been filled in by broadcasting to it
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shell_info->process_reaped.SetValue(true, eBroadcastAlways);
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}
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Status Host::RunShellCommand(llvm::StringRef command,
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const FileSpec &working_dir, int *status_ptr,
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int *signo_ptr, std::string *command_output_ptr,
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const Timeout<std::micro> &timeout,
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bool run_in_shell, bool hide_stderr) {
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return RunShellCommand(llvm::StringRef(), Args(command), working_dir,
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status_ptr, signo_ptr, command_output_ptr, timeout,
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run_in_shell, hide_stderr);
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}
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Status Host::RunShellCommand(llvm::StringRef shell_path,
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llvm::StringRef command,
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const FileSpec &working_dir, int *status_ptr,
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int *signo_ptr, std::string *command_output_ptr,
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const Timeout<std::micro> &timeout,
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bool run_in_shell, bool hide_stderr) {
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return RunShellCommand(shell_path, Args(command), working_dir, status_ptr,
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signo_ptr, command_output_ptr, timeout, run_in_shell,
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hide_stderr);
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}
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Status Host::RunShellCommand(const Args &args, const FileSpec &working_dir,
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int *status_ptr, int *signo_ptr,
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std::string *command_output_ptr,
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const Timeout<std::micro> &timeout,
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bool run_in_shell, bool hide_stderr) {
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return RunShellCommand(llvm::StringRef(), args, working_dir, status_ptr,
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signo_ptr, command_output_ptr, timeout, run_in_shell,
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hide_stderr);
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}
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Status Host::RunShellCommand(llvm::StringRef shell_path, const Args &args,
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const FileSpec &working_dir, int *status_ptr,
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int *signo_ptr, std::string *command_output_ptr,
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const Timeout<std::micro> &timeout,
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bool run_in_shell, bool hide_stderr) {
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Status error;
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ProcessLaunchInfo launch_info;
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launch_info.SetArchitecture(HostInfo::GetArchitecture());
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if (run_in_shell) {
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// Run the command in a shell
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FileSpec shell = HostInfo::GetDefaultShell();
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if (!shell_path.empty())
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shell.SetPath(shell_path);
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launch_info.SetShell(shell);
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launch_info.GetArguments().AppendArguments(args);
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const bool will_debug = false;
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const bool first_arg_is_full_shell_command = false;
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launch_info.ConvertArgumentsForLaunchingInShell(
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error, will_debug, first_arg_is_full_shell_command, 0);
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} else {
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// No shell, just run it
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const bool first_arg_is_executable = true;
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launch_info.SetArguments(args, first_arg_is_executable);
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}
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launch_info.GetEnvironment() = Host::GetEnvironment();
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if (working_dir)
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launch_info.SetWorkingDirectory(working_dir);
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llvm::SmallString<64> output_file_path;
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if (command_output_ptr) {
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// Create a temporary file to get the stdout/stderr and redirect the output
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// of the command into this file. We will later read this file if all goes
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// well and fill the data into "command_output_ptr"
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if (FileSpec tmpdir_file_spec = HostInfo::GetProcessTempDir()) {
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tmpdir_file_spec.AppendPathComponent("lldb-shell-output.%%%%%%");
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llvm::sys::fs::createUniqueFile(tmpdir_file_spec.GetPath(),
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output_file_path);
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} else {
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llvm::sys::fs::createTemporaryFile("lldb-shell-output.%%%%%%", "",
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output_file_path);
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}
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}
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FileSpec output_file_spec(output_file_path.str());
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// Set up file descriptors.
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launch_info.AppendSuppressFileAction(STDIN_FILENO, true, false);
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if (output_file_spec)
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launch_info.AppendOpenFileAction(STDOUT_FILENO, output_file_spec, false,
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true);
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else
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launch_info.AppendSuppressFileAction(STDOUT_FILENO, false, true);
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if (output_file_spec && !hide_stderr)
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launch_info.AppendDuplicateFileAction(STDOUT_FILENO, STDERR_FILENO);
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else
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launch_info.AppendSuppressFileAction(STDERR_FILENO, false, true);
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std::shared_ptr<ShellInfo> shell_info_sp(new ShellInfo());
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launch_info.SetMonitorProcessCallback(
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std::bind(MonitorShellCommand, shell_info_sp, std::placeholders::_1,
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std::placeholders::_2, std::placeholders::_3));
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error = LaunchProcess(launch_info);
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const lldb::pid_t pid = launch_info.GetProcessID();
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if (error.Success() && pid == LLDB_INVALID_PROCESS_ID)
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error.SetErrorString("failed to get process ID");
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if (error.Success()) {
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if (!shell_info_sp->process_reaped.WaitForValueEqualTo(true, timeout)) {
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error.SetErrorString("timed out waiting for shell command to complete");
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// Kill the process since it didn't complete within the timeout specified
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Kill(pid, SIGKILL);
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// Wait for the monitor callback to get the message
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|
shell_info_sp->process_reaped.WaitForValueEqualTo(
|
|
true, std::chrono::seconds(1));
|
|
} else {
|
|
if (status_ptr)
|
|
*status_ptr = shell_info_sp->status;
|
|
|
|
if (signo_ptr)
|
|
*signo_ptr = shell_info_sp->signo;
|
|
|
|
if (command_output_ptr) {
|
|
command_output_ptr->clear();
|
|
uint64_t file_size =
|
|
FileSystem::Instance().GetByteSize(output_file_spec);
|
|
if (file_size > 0) {
|
|
if (file_size > command_output_ptr->max_size()) {
|
|
error.SetErrorStringWithFormat(
|
|
"shell command output is too large to fit into a std::string");
|
|
} else {
|
|
WritableDataBufferSP Buffer =
|
|
FileSystem::Instance().CreateWritableDataBuffer(
|
|
output_file_spec);
|
|
if (error.Success())
|
|
command_output_ptr->assign(
|
|
reinterpret_cast<char *>(Buffer->GetBytes()),
|
|
Buffer->GetByteSize());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
llvm::sys::fs::remove(output_file_spec.GetPath());
|
|
return error;
|
|
}
|
|
|
|
// The functions below implement process launching for non-Apple-based
|
|
// platforms
|
|
#if !defined(__APPLE__)
|
|
Status Host::LaunchProcess(ProcessLaunchInfo &launch_info) {
|
|
std::unique_ptr<ProcessLauncher> delegate_launcher;
|
|
#if defined(_WIN32)
|
|
delegate_launcher.reset(new ProcessLauncherWindows());
|
|
#else
|
|
delegate_launcher.reset(new ProcessLauncherPosixFork());
|
|
#endif
|
|
MonitoringProcessLauncher launcher(std::move(delegate_launcher));
|
|
|
|
Status error;
|
|
HostProcess process = launcher.LaunchProcess(launch_info, error);
|
|
|
|
// TODO(zturner): It would be better if the entire HostProcess were returned
|
|
// instead of writing it into this structure.
|
|
launch_info.SetProcessID(process.GetProcessId());
|
|
|
|
return error;
|
|
}
|
|
#endif // !defined(__APPLE__)
|
|
|
|
#ifndef _WIN32
|
|
void Host::Kill(lldb::pid_t pid, int signo) { ::kill(pid, signo); }
|
|
|
|
#endif
|
|
|
|
#if !defined(__APPLE__)
|
|
llvm::Error Host::OpenFileInExternalEditor(llvm::StringRef editor,
|
|
const FileSpec &file_spec,
|
|
uint32_t line_no) {
|
|
return llvm::errorCodeToError(
|
|
std::error_code(ENOTSUP, std::system_category()));
|
|
}
|
|
|
|
bool Host::IsInteractiveGraphicSession() { return false; }
|
|
#endif
|
|
|
|
std::unique_ptr<Connection> Host::CreateDefaultConnection(llvm::StringRef url) {
|
|
#if defined(_WIN32)
|
|
if (url.starts_with("file://"))
|
|
return std::unique_ptr<Connection>(new ConnectionGenericFile());
|
|
#endif
|
|
return std::unique_ptr<Connection>(new ConnectionFileDescriptor());
|
|
}
|
|
|
|
#if defined(LLVM_ON_UNIX)
|
|
WaitStatus WaitStatus::Decode(int wstatus) {
|
|
if (WIFEXITED(wstatus))
|
|
return {Exit, uint8_t(WEXITSTATUS(wstatus))};
|
|
else if (WIFSIGNALED(wstatus))
|
|
return {Signal, uint8_t(WTERMSIG(wstatus))};
|
|
else if (WIFSTOPPED(wstatus))
|
|
return {Stop, uint8_t(WSTOPSIG(wstatus))};
|
|
llvm_unreachable("Unknown wait status");
|
|
}
|
|
#endif
|
|
|
|
void llvm::format_provider<WaitStatus>::format(const WaitStatus &WS,
|
|
raw_ostream &OS,
|
|
StringRef Options) {
|
|
if (Options == "g") {
|
|
char type;
|
|
switch (WS.type) {
|
|
case WaitStatus::Exit:
|
|
type = 'W';
|
|
break;
|
|
case WaitStatus::Signal:
|
|
type = 'X';
|
|
break;
|
|
case WaitStatus::Stop:
|
|
type = 'S';
|
|
break;
|
|
}
|
|
OS << formatv("{0}{1:x-2}", type, WS.status);
|
|
return;
|
|
}
|
|
|
|
assert(Options.empty());
|
|
const char *desc;
|
|
switch(WS.type) {
|
|
case WaitStatus::Exit:
|
|
desc = "Exited with status";
|
|
break;
|
|
case WaitStatus::Signal:
|
|
desc = "Killed by signal";
|
|
break;
|
|
case WaitStatus::Stop:
|
|
desc = "Stopped by signal";
|
|
break;
|
|
}
|
|
OS << desc << " " << int(WS.status);
|
|
}
|
|
|
|
uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info,
|
|
ProcessInstanceInfoList &process_infos) {
|
|
return FindProcessesImpl(match_info, process_infos);
|
|
}
|
|
|
|
char SystemLogHandler::ID;
|
|
|
|
SystemLogHandler::SystemLogHandler() {}
|
|
|
|
void SystemLogHandler::Emit(llvm::StringRef message) {
|
|
Host::SystemLog(message);
|
|
}
|