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clang-p2996/lldb/source/Host/common/Host.cpp
Chaoren Lin f9e915ae10 ComputeSupportExeDirectory for Linux 
Summary:
Fixes http://reviews.llvm.org/D8511

The original method of using dladdr() could return the incorrect relative
path if not dynamically linked against liblldb and the working directory
has changed. This is not a problem when built with python, since
ScriptInterpreterPython::InitializePrivate calls
HostInfo::GetLLDBPath(ePathTypeLLDBShlibDir, ...) and caches the
correct path before any changes to the working directory.

The /proc/self/exe approach fails if run using Python, but works for all other
cases (including for android, which doesn't have dladdr()).

So if we combine the two, we should reasonably cover all corner cases.

Reviewers: vharron, ovyalov, clayborg

Reviewed By: ovyalov, clayborg

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D8570

llvm-svn: 233129
2015-03-24 23:07:02 +00:00

1079 lines
36 KiB
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//===-- Host.cpp ------------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C includes
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <sys/types.h>
#ifndef _WIN32
#include <unistd.h>
#include <dlfcn.h>
#include <grp.h>
#include <netdb.h>
#include <pwd.h>
#include <sys/stat.h>
#endif
#if defined (__APPLE__)
#include <mach/mach_port.h>
#include <mach/mach_init.h>
#include <mach-o/dyld.h>
#endif
#if defined (__linux__) || defined (__FreeBSD__) || defined (__FreeBSD_kernel__) || defined (__APPLE__) || defined(__NetBSD__)
#if !defined(__ANDROID__) && !defined(__ANDROID_NDK__)
#include <spawn.h>
#endif
#include <sys/wait.h>
#include <sys/syscall.h>
#endif
#if defined (__FreeBSD__)
#include <pthread_np.h>
#endif
// C++ includes
#include <limits>
#include "lldb/Host/FileSystem.h"
#include "lldb/Host/Host.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Core/ArchSpec.h"
#include "lldb/Core/Error.h"
#include "lldb/Core/Log.h"
#include "lldb/Host/FileSpec.h"
#include "lldb/Host/HostProcess.h"
#include "lldb/Host/MonitoringProcessLauncher.h"
#include "lldb/Host/Predicate.h"
#include "lldb/Host/ProcessLauncher.h"
#include "lldb/Host/ThreadLauncher.h"
#include "lldb/lldb-private-forward.h"
#include "llvm/Support/FileSystem.h"
#include "lldb/Target/FileAction.h"
#include "lldb/Target/ProcessLaunchInfo.h"
#include "lldb/Target/UnixSignals.h"
#include "lldb/Utility/CleanUp.h"
#include "llvm/ADT/SmallString.h"
#if defined(_WIN32)
#include "lldb/Host/windows/ProcessLauncherWindows.h"
#elif defined(__ANDROID__) || defined(__ANDROID_NDK__)
#include "lldb/Host/android/ProcessLauncherAndroid.h"
#else
#include "lldb/Host/posix/ProcessLauncherPosix.h"
#endif
#if defined (__APPLE__)
#ifndef _POSIX_SPAWN_DISABLE_ASLR
#define _POSIX_SPAWN_DISABLE_ASLR 0x0100
#endif
extern "C"
{
int __pthread_chdir(const char *path);
int __pthread_fchdir (int fildes);
}
#endif
using namespace lldb;
using namespace lldb_private;
#if !defined (__APPLE__) && !defined (_WIN32)
struct MonitorInfo
{
lldb::pid_t pid; // The process ID to monitor
Host::MonitorChildProcessCallback callback; // The callback function to call when "pid" exits or signals
void *callback_baton; // The callback baton for the callback function
bool monitor_signals; // If true, call the callback when "pid" gets signaled.
};
static thread_result_t
MonitorChildProcessThreadFunction (void *arg);
HostThread
Host::StartMonitoringChildProcess(Host::MonitorChildProcessCallback callback, void *callback_baton, lldb::pid_t pid, bool monitor_signals)
{
MonitorInfo * info_ptr = new MonitorInfo();
info_ptr->pid = pid;
info_ptr->callback = callback;
info_ptr->callback_baton = callback_baton;
info_ptr->monitor_signals = monitor_signals;
char thread_name[256];
::snprintf(thread_name, sizeof(thread_name), "<lldb.host.wait4(pid=%" PRIu64 ")>", pid);
return ThreadLauncher::LaunchThread(thread_name, MonitorChildProcessThreadFunction, info_ptr, NULL);
}
#ifndef __linux__
//------------------------------------------------------------------
// Scoped class that will disable thread canceling when it is
// constructed, and exception safely restore the previous value it
// when it goes out of scope.
//------------------------------------------------------------------
class ScopedPThreadCancelDisabler
{
public:
ScopedPThreadCancelDisabler()
{
// Disable the ability for this thread to be cancelled
int err = ::pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &m_old_state);
if (err != 0)
m_old_state = -1;
}
~ScopedPThreadCancelDisabler()
{
// Restore the ability for this thread to be cancelled to what it
// previously was.
if (m_old_state != -1)
::pthread_setcancelstate (m_old_state, 0);
}
private:
int m_old_state; // Save the old cancelability state.
};
#endif // __linux__
#ifdef __linux__
static thread_local volatile sig_atomic_t g_usr1_called;
static void
SigUsr1Handler (int)
{
g_usr1_called = 1;
}
#endif // __linux__
static bool
CheckForMonitorCancellation()
{
#ifdef __linux__
if (g_usr1_called)
{
g_usr1_called = 0;
return true;
}
#else
::pthread_testcancel ();
#endif
return false;
}
static thread_result_t
MonitorChildProcessThreadFunction (void *arg)
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS));
const char *function = __FUNCTION__;
if (log)
log->Printf ("%s (arg = %p) thread starting...", function, arg);
MonitorInfo *info = (MonitorInfo *)arg;
const Host::MonitorChildProcessCallback callback = info->callback;
void * const callback_baton = info->callback_baton;
const bool monitor_signals = info->monitor_signals;
assert (info->pid <= UINT32_MAX);
const ::pid_t pid = monitor_signals ? -1 * getpgid(info->pid) : info->pid;
delete info;
int status = -1;
#if defined (__FreeBSD__) || defined (__FreeBSD_kernel__)
#define __WALL 0
#endif
const int options = __WALL;
#ifdef __linux__
// This signal is only used to interrupt the thread from waitpid
struct sigaction sigUsr1Action;
memset(&sigUsr1Action, 0, sizeof(sigUsr1Action));
sigUsr1Action.sa_handler = SigUsr1Handler;
::sigaction(SIGUSR1, &sigUsr1Action, nullptr);
#endif // __linux__
while (1)
{
log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS);
if (log)
log->Printf("%s ::waitpid (pid = %" PRIi32 ", &status, options = %i)...", function, pid, options);
if (CheckForMonitorCancellation ())
break;
// Get signals from all children with same process group of pid
const ::pid_t wait_pid = ::waitpid (pid, &status, options);
if (CheckForMonitorCancellation ())
break;
if (wait_pid == -1)
{
if (errno == EINTR)
continue;
else
{
if (log)
log->Printf ("%s (arg = %p) thread exiting because waitpid failed (%s)...", __FUNCTION__, arg, strerror(errno));
break;
}
}
else if (wait_pid > 0)
{
bool exited = false;
int signal = 0;
int exit_status = 0;
const char *status_cstr = NULL;
if (WIFSTOPPED(status))
{
signal = WSTOPSIG(status);
status_cstr = "STOPPED";
}
else if (WIFEXITED(status))
{
exit_status = WEXITSTATUS(status);
status_cstr = "EXITED";
exited = true;
}
else if (WIFSIGNALED(status))
{
signal = WTERMSIG(status);
status_cstr = "SIGNALED";
if (wait_pid == abs(pid)) {
exited = true;
exit_status = -1;
}
}
else
{
status_cstr = "(\?\?\?)";
}
// Scope for pthread_cancel_disabler
{
#ifndef __linux__
ScopedPThreadCancelDisabler pthread_cancel_disabler;
#endif
log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS);
if (log)
log->Printf ("%s ::waitpid (pid = %" PRIi32 ", &status, options = %i) => pid = %" PRIi32 ", status = 0x%8.8x (%s), signal = %i, exit_state = %i",
function,
pid,
options,
wait_pid,
status,
status_cstr,
signal,
exit_status);
if (exited || (signal != 0 && monitor_signals))
{
bool callback_return = false;
if (callback)
callback_return = callback (callback_baton, wait_pid, exited, signal, exit_status);
// If our process exited, then this thread should exit
if (exited && wait_pid == abs(pid))
{
if (log)
log->Printf ("%s (arg = %p) thread exiting because pid received exit signal...", __FUNCTION__, arg);
break;
}
// If the callback returns true, it means this process should
// exit
if (callback_return)
{
if (log)
log->Printf ("%s (arg = %p) thread exiting because callback returned true...", __FUNCTION__, arg);
break;
}
}
}
}
}
log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS);
if (log)
log->Printf ("%s (arg = %p) thread exiting...", __FUNCTION__, arg);
return NULL;
}
#endif // #if !defined (__APPLE__) && !defined (_WIN32)
#if !defined (__APPLE__)
void
Host::SystemLog (SystemLogType type, const char *format, va_list args)
{
vfprintf (stderr, format, args);
}
#endif
void
Host::SystemLog (SystemLogType type, const char *format, ...)
{
va_list args;
va_start (args, format);
SystemLog (type, format, args);
va_end (args);
}
lldb::pid_t
Host::GetCurrentProcessID()
{
return ::getpid();
}
#ifndef _WIN32
lldb::tid_t
Host::GetCurrentThreadID()
{
#if defined (__APPLE__)
// Calling "mach_thread_self()" bumps the reference count on the thread
// port, so we need to deallocate it. mach_task_self() doesn't bump the ref
// count.
thread_port_t thread_self = mach_thread_self();
mach_port_deallocate(mach_task_self(), thread_self);
return thread_self;
#elif defined(__FreeBSD__)
return lldb::tid_t(pthread_getthreadid_np());
#elif defined(__ANDROID_NDK__)
return lldb::tid_t(gettid());
#elif defined(__linux__)
return lldb::tid_t(syscall(SYS_gettid));
#else
return lldb::tid_t(pthread_self());
#endif
}
lldb::thread_t
Host::GetCurrentThread ()
{
return lldb::thread_t(pthread_self());
}
const char *
Host::GetSignalAsCString (int signo)
{
switch (signo)
{
case SIGHUP: return "SIGHUP"; // 1 hangup
case SIGINT: return "SIGINT"; // 2 interrupt
case SIGQUIT: return "SIGQUIT"; // 3 quit
case SIGILL: return "SIGILL"; // 4 illegal instruction (not reset when caught)
case SIGTRAP: return "SIGTRAP"; // 5 trace trap (not reset when caught)
case SIGABRT: return "SIGABRT"; // 6 abort()
#if defined(SIGPOLL)
#if !defined(SIGIO) || (SIGPOLL != SIGIO)
// Under some GNU/Linux, SIGPOLL and SIGIO are the same. Causing the build to
// fail with 'multiple define cases with same value'
case SIGPOLL: return "SIGPOLL"; // 7 pollable event ([XSR] generated, not supported)
#endif
#endif
#if defined(SIGEMT)
case SIGEMT: return "SIGEMT"; // 7 EMT instruction
#endif
case SIGFPE: return "SIGFPE"; // 8 floating point exception
case SIGKILL: return "SIGKILL"; // 9 kill (cannot be caught or ignored)
case SIGBUS: return "SIGBUS"; // 10 bus error
case SIGSEGV: return "SIGSEGV"; // 11 segmentation violation
case SIGSYS: return "SIGSYS"; // 12 bad argument to system call
case SIGPIPE: return "SIGPIPE"; // 13 write on a pipe with no one to read it
case SIGALRM: return "SIGALRM"; // 14 alarm clock
case SIGTERM: return "SIGTERM"; // 15 software termination signal from kill
case SIGURG: return "SIGURG"; // 16 urgent condition on IO channel
case SIGSTOP: return "SIGSTOP"; // 17 sendable stop signal not from tty
case SIGTSTP: return "SIGTSTP"; // 18 stop signal from tty
case SIGCONT: return "SIGCONT"; // 19 continue a stopped process
case SIGCHLD: return "SIGCHLD"; // 20 to parent on child stop or exit
case SIGTTIN: return "SIGTTIN"; // 21 to readers pgrp upon background tty read
case SIGTTOU: return "SIGTTOU"; // 22 like TTIN for output if (tp->t_local&LTOSTOP)
#if defined(SIGIO)
case SIGIO: return "SIGIO"; // 23 input/output possible signal
#endif
case SIGXCPU: return "SIGXCPU"; // 24 exceeded CPU time limit
case SIGXFSZ: return "SIGXFSZ"; // 25 exceeded file size limit
case SIGVTALRM: return "SIGVTALRM"; // 26 virtual time alarm
case SIGPROF: return "SIGPROF"; // 27 profiling time alarm
#if defined(SIGWINCH)
case SIGWINCH: return "SIGWINCH"; // 28 window size changes
#endif
#if defined(SIGINFO)
case SIGINFO: return "SIGINFO"; // 29 information request
#endif
case SIGUSR1: return "SIGUSR1"; // 30 user defined signal 1
case SIGUSR2: return "SIGUSR2"; // 31 user defined signal 2
default:
break;
}
return NULL;
}
#endif
#if !defined (__APPLE__) && !defined (__FreeBSD__) && !defined (__FreeBSD_kernel__) && !defined (__linux__) // see macosx/Host.mm
size_t
Host::GetEnvironment (StringList &env)
{
// TODO: Is there a way to the host environment for this process on other systems?
return 0;
}
#endif // #if !defined (__APPLE__) && !defined (__FreeBSD__) && !defined (__FreeBSD_kernel__) && !defined (__linux__)
#ifndef _WIN32
lldb::thread_key_t
Host::ThreadLocalStorageCreate(ThreadLocalStorageCleanupCallback callback)
{
pthread_key_t key;
::pthread_key_create (&key, callback);
return key;
}
void*
Host::ThreadLocalStorageGet(lldb::thread_key_t key)
{
return ::pthread_getspecific (key);
}
void
Host::ThreadLocalStorageSet(lldb::thread_key_t key, void *value)
{
::pthread_setspecific (key, value);
}
#endif
#if !defined (__APPLE__) // see Host.mm
bool
Host::GetBundleDirectory (const FileSpec &file, FileSpec &bundle)
{
bundle.Clear();
return false;
}
bool
Host::ResolveExecutableInBundle (FileSpec &file)
{
return false;
}
#endif
#ifndef _WIN32
FileSpec
Host::GetModuleFileSpecForHostAddress (const void *host_addr)
{
FileSpec module_filespec;
#if !defined(__ANDROID__) && !defined(__ANDROID_NDK__)
Dl_info info;
if (::dladdr (host_addr, &info))
{
if (info.dli_fname)
module_filespec.SetFile(info.dli_fname, true);
}
#endif
return module_filespec;
}
#endif
#if !defined(__linux__)
bool
Host::FindProcessThreads (const lldb::pid_t pid, TidMap &tids_to_attach)
{
return false;
}
#endif
struct ShellInfo
{
ShellInfo () :
process_reaped (false),
can_delete (false),
pid (LLDB_INVALID_PROCESS_ID),
signo(-1),
status(-1)
{
}
lldb_private::Predicate<bool> process_reaped;
lldb_private::Predicate<bool> can_delete;
lldb::pid_t pid;
int signo;
int status;
};
static bool
MonitorShellCommand (void *callback_baton,
lldb::pid_t pid,
bool exited, // True if the process did exit
int signo, // Zero for no signal
int status) // Exit value of process if signal is zero
{
ShellInfo *shell_info = (ShellInfo *)callback_baton;
shell_info->pid = pid;
shell_info->signo = signo;
shell_info->status = status;
// Let the thread running Host::RunShellCommand() know that the process
// exited and that ShellInfo has been filled in by broadcasting to it
shell_info->process_reaped.SetValue(1, eBroadcastAlways);
// Now wait for a handshake back from that thread running Host::RunShellCommand
// so we know that we can delete shell_info_ptr
shell_info->can_delete.WaitForValueEqualTo(true);
// Sleep a bit to allow the shell_info->can_delete.SetValue() to complete...
usleep(1000);
// Now delete the shell info that was passed into this function
delete shell_info;
return true;
}
Error
Host::RunShellCommand (const char *command,
const char *working_dir,
int *status_ptr,
int *signo_ptr,
std::string *command_output_ptr,
uint32_t timeout_sec,
bool run_in_default_shell)
{
Error error;
ProcessLaunchInfo launch_info;
launch_info.SetArchitecture(HostInfo::GetArchitecture());
if (run_in_default_shell)
{
// Run the command in a shell
launch_info.SetShell(HostInfo::GetDefaultShell());
launch_info.GetArguments().AppendArgument(command);
const bool localhost = true;
const bool will_debug = false;
const bool first_arg_is_full_shell_command = true;
launch_info.ConvertArgumentsForLaunchingInShell (error,
localhost,
will_debug,
first_arg_is_full_shell_command,
0);
}
else
{
// No shell, just run it
Args args (command);
const bool first_arg_is_executable = true;
launch_info.SetArguments(args, first_arg_is_executable);
}
if (working_dir)
launch_info.SetWorkingDirectory(working_dir);
llvm::SmallString<PATH_MAX> output_file_path;
if (command_output_ptr)
{
// Create a temporary file to get the stdout/stderr and redirect the
// output of the command into this file. We will later read this file
// if all goes well and fill the data into "command_output_ptr"
FileSpec tmpdir_file_spec;
if (HostInfo::GetLLDBPath(ePathTypeLLDBTempSystemDir, tmpdir_file_spec))
{
tmpdir_file_spec.AppendPathComponent("lldb-shell-output.%%%%%%");
llvm::sys::fs::createUniqueFile(tmpdir_file_spec.GetPath().c_str(), output_file_path);
}
else
{
llvm::sys::fs::createTemporaryFile("lldb-shell-output.%%%%%%", "", output_file_path);
}
}
launch_info.AppendSuppressFileAction (STDIN_FILENO, true, false);
if (!output_file_path.empty())
{
launch_info.AppendOpenFileAction(STDOUT_FILENO, output_file_path.c_str(), false, true);
launch_info.AppendDuplicateFileAction(STDOUT_FILENO, STDERR_FILENO);
}
else
{
launch_info.AppendSuppressFileAction (STDOUT_FILENO, false, true);
launch_info.AppendSuppressFileAction (STDERR_FILENO, false, true);
}
// The process monitor callback will delete the 'shell_info_ptr' below...
std::unique_ptr<ShellInfo> shell_info_ap (new ShellInfo());
const bool monitor_signals = false;
launch_info.SetMonitorProcessCallback(MonitorShellCommand, shell_info_ap.get(), monitor_signals);
error = LaunchProcess (launch_info);
const lldb::pid_t pid = launch_info.GetProcessID();
if (error.Success() && pid == LLDB_INVALID_PROCESS_ID)
error.SetErrorString("failed to get process ID");
if (error.Success())
{
// The process successfully launched, so we can defer ownership of
// "shell_info" to the MonitorShellCommand callback function that will
// get called when the process dies. We release the unique pointer as it
// doesn't need to delete the ShellInfo anymore.
ShellInfo *shell_info = shell_info_ap.release();
TimeValue *timeout_ptr = nullptr;
TimeValue timeout_time(TimeValue::Now());
if (timeout_sec > 0) {
timeout_time.OffsetWithSeconds(timeout_sec);
timeout_ptr = &timeout_time;
}
bool timed_out = false;
shell_info->process_reaped.WaitForValueEqualTo(true, timeout_ptr, &timed_out);
if (timed_out)
{
error.SetErrorString("timed out waiting for shell command to complete");
// Kill the process since it didn't complete within the timeout specified
Kill (pid, SIGKILL);
// Wait for the monitor callback to get the message
timeout_time = TimeValue::Now();
timeout_time.OffsetWithSeconds(1);
timed_out = false;
shell_info->process_reaped.WaitForValueEqualTo(true, &timeout_time, &timed_out);
}
else
{
if (status_ptr)
*status_ptr = shell_info->status;
if (signo_ptr)
*signo_ptr = shell_info->signo;
if (command_output_ptr)
{
command_output_ptr->clear();
FileSpec file_spec(output_file_path.c_str(), File::eOpenOptionRead);
uint64_t file_size = file_spec.GetByteSize();
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
{
command_output_ptr->resize(file_size);
file_spec.ReadFileContents(0, &((*command_output_ptr)[0]), command_output_ptr->size(), &error);
}
}
}
}
shell_info->can_delete.SetValue(true, eBroadcastAlways);
}
FileSpec output_file_spec(output_file_path.c_str(), false);
if (FileSystem::GetFileExists(output_file_spec))
FileSystem::Unlink(output_file_path.c_str());
// Handshake with the monitor thread, or just let it know in advance that
// it can delete "shell_info" in case we timed out and were not able to kill
// the process...
return error;
}
// LaunchProcessPosixSpawn for Apple, Linux, FreeBSD and other GLIBC
// systems
#if defined (__APPLE__) || defined (__linux__) || defined (__FreeBSD__) || defined (__GLIBC__) || defined(__NetBSD__)
#if !defined(__ANDROID__) && !defined(__ANDROID_NDK__)
// this method needs to be visible to macosx/Host.cpp and
// common/Host.cpp.
short
Host::GetPosixspawnFlags(const ProcessLaunchInfo &launch_info)
{
short flags = POSIX_SPAWN_SETSIGDEF | POSIX_SPAWN_SETSIGMASK;
#if defined (__APPLE__)
if (launch_info.GetFlags().Test (eLaunchFlagExec))
flags |= POSIX_SPAWN_SETEXEC; // Darwin specific posix_spawn flag
if (launch_info.GetFlags().Test (eLaunchFlagDebug))
flags |= POSIX_SPAWN_START_SUSPENDED; // Darwin specific posix_spawn flag
if (launch_info.GetFlags().Test (eLaunchFlagDisableASLR))
flags |= _POSIX_SPAWN_DISABLE_ASLR; // Darwin specific posix_spawn flag
if (launch_info.GetLaunchInSeparateProcessGroup())
flags |= POSIX_SPAWN_SETPGROUP;
#ifdef POSIX_SPAWN_CLOEXEC_DEFAULT
#if defined (__APPLE__) && (defined (__x86_64__) || defined (__i386__))
static LazyBool g_use_close_on_exec_flag = eLazyBoolCalculate;
if (g_use_close_on_exec_flag == eLazyBoolCalculate)
{
g_use_close_on_exec_flag = eLazyBoolNo;
uint32_t major, minor, update;
if (HostInfo::GetOSVersion(major, minor, update))
{
// Kernel panic if we use the POSIX_SPAWN_CLOEXEC_DEFAULT on 10.7 or earlier
if (major > 10 || (major == 10 && minor > 7))
{
// Only enable for 10.8 and later OS versions
g_use_close_on_exec_flag = eLazyBoolYes;
}
}
}
#else
static LazyBool g_use_close_on_exec_flag = eLazyBoolYes;
#endif
// Close all files exception those with file actions if this is supported.
if (g_use_close_on_exec_flag == eLazyBoolYes)
flags |= POSIX_SPAWN_CLOEXEC_DEFAULT;
#endif
#endif // #if defined (__APPLE__)
return flags;
}
Error
Host::LaunchProcessPosixSpawn(const char *exe_path, const ProcessLaunchInfo &launch_info, lldb::pid_t &pid)
{
Error error;
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_HOST | LIBLLDB_LOG_PROCESS));
posix_spawnattr_t attr;
error.SetError( ::posix_spawnattr_init (&attr), eErrorTypePOSIX);
if (error.Fail() || log)
error.PutToLog(log, "::posix_spawnattr_init ( &attr )");
if (error.Fail())
return error;
// Make a quick class that will cleanup the posix spawn attributes in case
// we return in the middle of this function.
lldb_utility::CleanUp <posix_spawnattr_t *, int> posix_spawnattr_cleanup(&attr, posix_spawnattr_destroy);
sigset_t no_signals;
sigset_t all_signals;
sigemptyset (&no_signals);
sigfillset (&all_signals);
::posix_spawnattr_setsigmask(&attr, &no_signals);
#if defined (__linux__) || defined (__FreeBSD__)
::posix_spawnattr_setsigdefault(&attr, &no_signals);
#else
::posix_spawnattr_setsigdefault(&attr, &all_signals);
#endif
short flags = GetPosixspawnFlags(launch_info);
error.SetError( ::posix_spawnattr_setflags (&attr, flags), eErrorTypePOSIX);
if (error.Fail() || log)
error.PutToLog(log, "::posix_spawnattr_setflags ( &attr, flags=0x%8.8x )", flags);
if (error.Fail())
return error;
// posix_spawnattr_setbinpref_np appears to be an Apple extension per:
// http://www.unix.com/man-page/OSX/3/posix_spawnattr_setbinpref_np/
#if defined (__APPLE__) && !defined (__arm__)
// Don't set the binpref if a shell was provided. After all, that's only going to affect what version of the shell
// is launched, not what fork of the binary is launched. We insert "arch --arch <ARCH> as part of the shell invocation
// to do that job on OSX.
if (launch_info.GetShell() == nullptr)
{
// We don't need to do this for ARM, and we really shouldn't now that we
// have multiple CPU subtypes and no posix_spawnattr call that allows us
// to set which CPU subtype to launch...
const ArchSpec &arch_spec = launch_info.GetArchitecture();
cpu_type_t cpu = arch_spec.GetMachOCPUType();
cpu_type_t sub = arch_spec.GetMachOCPUSubType();
if (cpu != 0 &&
cpu != static_cast<cpu_type_t>(UINT32_MAX) &&
cpu != static_cast<cpu_type_t>(LLDB_INVALID_CPUTYPE) &&
!(cpu == 0x01000007 && sub == 8)) // If haswell is specified, don't try to set the CPU type or we will fail
{
size_t ocount = 0;
error.SetError( ::posix_spawnattr_setbinpref_np (&attr, 1, &cpu, &ocount), eErrorTypePOSIX);
if (error.Fail() || log)
error.PutToLog(log, "::posix_spawnattr_setbinpref_np ( &attr, 1, cpu_type = 0x%8.8x, count => %llu )", cpu, (uint64_t)ocount);
if (error.Fail() || ocount != 1)
return error;
}
}
#endif
const char *tmp_argv[2];
char * const *argv = (char * const*)launch_info.GetArguments().GetConstArgumentVector();
char * const *envp = (char * const*)launch_info.GetEnvironmentEntries().GetConstArgumentVector();
if (argv == NULL)
{
// posix_spawn gets very unhappy if it doesn't have at least the program
// name in argv[0]. One of the side affects I have noticed is the environment
// variables don't make it into the child process if "argv == NULL"!!!
tmp_argv[0] = exe_path;
tmp_argv[1] = NULL;
argv = (char * const*)tmp_argv;
}
#if !defined (__APPLE__)
// manage the working directory
char current_dir[PATH_MAX];
current_dir[0] = '\0';
#endif
const char *working_dir = launch_info.GetWorkingDirectory();
if (working_dir)
{
#if defined (__APPLE__)
// Set the working directory on this thread only
if (__pthread_chdir (working_dir) < 0) {
if (errno == ENOENT) {
error.SetErrorStringWithFormat("No such file or directory: %s", working_dir);
} else if (errno == ENOTDIR) {
error.SetErrorStringWithFormat("Path doesn't name a directory: %s", working_dir);
} else {
error.SetErrorStringWithFormat("An unknown error occurred when changing directory for process execution.");
}
return error;
}
#else
if (::getcwd(current_dir, sizeof(current_dir)) == NULL)
{
error.SetError(errno, eErrorTypePOSIX);
error.LogIfError(log, "unable to save the current directory");
return error;
}
if (::chdir(working_dir) == -1)
{
error.SetError(errno, eErrorTypePOSIX);
error.LogIfError(log, "unable to change working directory to %s", working_dir);
return error;
}
#endif
}
::pid_t result_pid = LLDB_INVALID_PROCESS_ID;
const size_t num_file_actions = launch_info.GetNumFileActions ();
if (num_file_actions > 0)
{
posix_spawn_file_actions_t file_actions;
error.SetError( ::posix_spawn_file_actions_init (&file_actions), eErrorTypePOSIX);
if (error.Fail() || log)
error.PutToLog(log, "::posix_spawn_file_actions_init ( &file_actions )");
if (error.Fail())
return error;
// Make a quick class that will cleanup the posix spawn attributes in case
// we return in the middle of this function.
lldb_utility::CleanUp <posix_spawn_file_actions_t *, int> posix_spawn_file_actions_cleanup (&file_actions, posix_spawn_file_actions_destroy);
for (size_t i=0; i<num_file_actions; ++i)
{
const FileAction *launch_file_action = launch_info.GetFileActionAtIndex(i);
if (launch_file_action)
{
if (!AddPosixSpawnFileAction(&file_actions, launch_file_action, log, error))
return error;
}
}
error.SetError(::posix_spawnp(&result_pid, exe_path, &file_actions, &attr, argv, envp), eErrorTypePOSIX);
if (error.Fail() || log)
{
error.PutToLog(log, "::posix_spawnp ( pid => %i, path = '%s', file_actions = %p, attr = %p, argv = %p, envp = %p )", result_pid,
exe_path, static_cast<void *>(&file_actions), static_cast<void *>(&attr), reinterpret_cast<const void *>(argv),
reinterpret_cast<const void *>(envp));
if (log)
{
for (int ii=0; argv[ii]; ++ii)
log->Printf("argv[%i] = '%s'", ii, argv[ii]);
}
}
}
else
{
error.SetError(::posix_spawnp(&result_pid, exe_path, NULL, &attr, argv, envp), eErrorTypePOSIX);
if (error.Fail() || log)
{
error.PutToLog(log, "::posix_spawnp ( pid => %i, path = '%s', file_actions = NULL, attr = %p, argv = %p, envp = %p )",
result_pid, exe_path, static_cast<void *>(&attr), reinterpret_cast<const void *>(argv),
reinterpret_cast<const void *>(envp));
if (log)
{
for (int ii=0; argv[ii]; ++ii)
log->Printf("argv[%i] = '%s'", ii, argv[ii]);
}
}
}
pid = result_pid;
if (working_dir)
{
#if defined (__APPLE__)
// No more thread specific current working directory
__pthread_fchdir (-1);
#else
if (::chdir(current_dir) == -1 && error.Success())
{
error.SetError(errno, eErrorTypePOSIX);
error.LogIfError(log, "unable to change current directory back to %s",
current_dir);
}
#endif
}
return error;
}
bool
Host::AddPosixSpawnFileAction(void *_file_actions, const FileAction *info, Log *log, Error &error)
{
if (info == NULL)
return false;
posix_spawn_file_actions_t *file_actions = reinterpret_cast<posix_spawn_file_actions_t *>(_file_actions);
switch (info->GetAction())
{
case FileAction::eFileActionNone:
error.Clear();
break;
case FileAction::eFileActionClose:
if (info->GetFD() == -1)
error.SetErrorString("invalid fd for posix_spawn_file_actions_addclose(...)");
else
{
error.SetError(::posix_spawn_file_actions_addclose(file_actions, info->GetFD()), eErrorTypePOSIX);
if (log && (error.Fail() || log))
error.PutToLog(log, "posix_spawn_file_actions_addclose (action=%p, fd=%i)",
static_cast<void *>(file_actions), info->GetFD());
}
break;
case FileAction::eFileActionDuplicate:
if (info->GetFD() == -1)
error.SetErrorString("invalid fd for posix_spawn_file_actions_adddup2(...)");
else if (info->GetActionArgument() == -1)
error.SetErrorString("invalid duplicate fd for posix_spawn_file_actions_adddup2(...)");
else
{
error.SetError(
::posix_spawn_file_actions_adddup2(file_actions, info->GetFD(), info->GetActionArgument()),
eErrorTypePOSIX);
if (log && (error.Fail() || log))
error.PutToLog(log, "posix_spawn_file_actions_adddup2 (action=%p, fd=%i, dup_fd=%i)",
static_cast<void *>(file_actions), info->GetFD(), info->GetActionArgument());
}
break;
case FileAction::eFileActionOpen:
if (info->GetFD() == -1)
error.SetErrorString("invalid fd in posix_spawn_file_actions_addopen(...)");
else
{
int oflag = info->GetActionArgument();
mode_t mode = 0;
if (oflag & O_CREAT)
mode = 0640;
error.SetError(
::posix_spawn_file_actions_addopen(file_actions, info->GetFD(), info->GetPath(), oflag, mode),
eErrorTypePOSIX);
if (error.Fail() || log)
error.PutToLog(log,
"posix_spawn_file_actions_addopen (action=%p, fd=%i, path='%s', oflag=%i, mode=%i)",
static_cast<void *>(file_actions), info->GetFD(), info->GetPath(), oflag, mode);
}
break;
}
return error.Success();
}
#endif // !defined(__ANDROID__) && !defined(__ANDROID_NDK__)
#endif // defined (__APPLE__) || defined (__linux__) || defined (__FreeBSD__) || defined (__GLIBC__) || defined(__NetBSD__)
#if defined(__linux__) || defined(__FreeBSD__) || defined(__GLIBC__) || defined(__NetBSD__) || defined(_WIN32)
// The functions below implement process launching via posix_spawn() for Linux,
// FreeBSD and NetBSD.
Error
Host::LaunchProcess (ProcessLaunchInfo &launch_info)
{
std::unique_ptr<ProcessLauncher> delegate_launcher;
#if defined(_WIN32)
delegate_launcher.reset(new ProcessLauncherWindows());
#elif defined(__ANDROID__) || defined(__ANDROID_NDK__)
delegate_launcher.reset(new ProcessLauncherAndroid());
#else
delegate_launcher.reset(new ProcessLauncherPosix());
#endif
MonitoringProcessLauncher launcher(std::move(delegate_launcher));
Error 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(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__)
#ifndef _WIN32
void
Host::Kill(lldb::pid_t pid, int signo)
{
::kill(pid, signo);
}
#endif
#if !defined (__APPLE__)
bool
Host::OpenFileInExternalEditor (const FileSpec &file_spec, uint32_t line_no)
{
return false;
}
void
Host::SetCrashDescriptionWithFormat (const char *format, ...)
{
}
void
Host::SetCrashDescription (const char *description)
{
}
#endif
#if !defined (__linux__) && !defined (__FreeBSD__) && !defined(__FreeBSD_kernel__) && !defined (__NetBSD__)
const lldb_private::UnixSignalsSP&
Host::GetUnixSignals ()
{
static UnixSignalsSP s_unix_signals_sp (new UnixSignals ());
return s_unix_signals_sp;
}
#endif
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