HostProcess
ProcessLauncherAndroid::LaunchProcess(const ProcessLaunchInfo &launch_info, Error &error)
{
// TODO: Handle other launch parameters specified in launc_info
char exe_path[PATH_MAX];
launch_info.GetExecutableFile().GetPath(exe_path, sizeof(exe_path));
lldb::pid_t pid = ::fork();
if (pid == static_cast<lldb::pid_t>(-1))
{
// Fork failed
error.SetErrorStringWithFormat("Fork failed with error message: %s", strerror(errno));
return HostProcess(LLDB_INVALID_PROCESS_ID);
}
else if (pid == 0)
{
if (const lldb_private::FileAction *file_action = launch_info.GetFileActionForFD(STDIN_FILENO)) {
const char* path = file_action->GetPath();
if (path && ::strlen(path))
if (!DupDescriptor(path, STDIN_FILENO, O_RDONLY))
exit(-1);
}
if (const lldb_private::FileAction *file_action = launch_info.GetFileActionForFD(STDOUT_FILENO)) {
const char* path = file_action->GetPath();
if (path && ::strlen(path))
if (!DupDescriptor(path, STDOUT_FILENO, O_WRONLY | O_CREAT | O_TRUNC))
exit(-1);
}
if (const lldb_private::FileAction *file_action = launch_info.GetFileActionForFD(STDERR_FILENO)) {
const char* path = file_action->GetPath();
if (path && ::strlen(path))
if (!DupDescriptor(path, STDERR_FILENO, O_WRONLY | O_CREAT | O_TRUNC))
exit(-1);
}
// Child process
const char **argv = launch_info.GetArguments().GetConstArgumentVector();
Args env = launch_info.GetEnvironmentEntries();
FixupEnvironment(env);
const char **envp = env.GetConstArgumentVector();
const char *working_dir = launch_info.GetWorkingDirectory();
if (working_dir != nullptr && working_dir[0])
{
if (::chdir(working_dir) != 0)
exit(-1);
}
execve(argv[0],
const_cast<char *const *>(argv),
const_cast<char *const *>(envp));
exit(-1);
}
return HostProcess(pid);
}
Error
ProcessPOSIX::DoLaunch (Module *module,
ProcessLaunchInfo &launch_info)
{
Error error;
assert(m_monitor == NULL);
const char* working_dir = launch_info.GetWorkingDirectory();
if (working_dir) {
FileSpec WorkingDir(working_dir, true);
if (!WorkingDir || WorkingDir.GetFileType() != FileSpec::eFileTypeDirectory)
{
error.SetErrorStringWithFormat("No such file or directory: %s", working_dir);
return error;
}
}
SetPrivateState(eStateLaunching);
const lldb_private::FileAction *file_action;
// Default of NULL will mean to use existing open file descriptors
const char *stdin_path = NULL;
const char *stdout_path = NULL;
const char *stderr_path = NULL;
const char * dbg_pts_path = launch_info.GetPTY().GetSlaveName(NULL,0);
file_action = launch_info.GetFileActionForFD (STDIN_FILENO);
stdin_path = GetFilePath(file_action, stdin_path, dbg_pts_path);
file_action = launch_info.GetFileActionForFD (STDOUT_FILENO);
stdout_path = GetFilePath(file_action, stdout_path, dbg_pts_path);
file_action = launch_info.GetFileActionForFD (STDERR_FILENO);
stderr_path = GetFilePath(file_action, stderr_path, dbg_pts_path);
m_monitor = new ProcessMonitor (this,
module,
launch_info.GetArguments().GetConstArgumentVector(),
launch_info.GetEnvironmentEntries().GetConstArgumentVector(),
stdin_path,
stdout_path,
stderr_path,
working_dir,
launch_info,
error);
m_module = module;
if (!error.Success())
return error;
SetSTDIOFileDescriptor(m_monitor->GetTerminalFD());
SetID(m_monitor->GetPID());
return error;
}
Error
ProcessFreeBSD::DoLaunch (Module *module,
ProcessLaunchInfo &launch_info)
{
Error error;
assert(m_monitor == NULL);
FileSpec working_dir = launch_info.GetWorkingDirectory();
if (working_dir &&
(!working_dir.ResolvePath() ||
working_dir.GetFileType() != FileSpec::eFileTypeDirectory))
{
error.SetErrorStringWithFormat("No such file or directory: %s",
working_dir.GetCString());
return error;
}
SetPrivateState(eStateLaunching);
const lldb_private::FileAction *file_action;
// Default of empty will mean to use existing open file descriptors
FileSpec stdin_file_spec{};
FileSpec stdout_file_spec{};
FileSpec stderr_file_spec{};
const FileSpec dbg_pts_file_spec{launch_info.GetPTY().GetSlaveName(NULL,0), false};
file_action = launch_info.GetFileActionForFD (STDIN_FILENO);
stdin_file_spec = GetFileSpec(file_action, stdin_file_spec, dbg_pts_file_spec);
file_action = launch_info.GetFileActionForFD (STDOUT_FILENO);
stdout_file_spec = GetFileSpec(file_action, stdout_file_spec, dbg_pts_file_spec);
file_action = launch_info.GetFileActionForFD (STDERR_FILENO);
stderr_file_spec = GetFileSpec(file_action, stderr_file_spec, dbg_pts_file_spec);
m_monitor = new ProcessMonitor(this,
module,
launch_info.GetArguments().GetConstArgumentVector(),
launch_info.GetEnvironmentEntries().GetConstArgumentVector(),
stdin_file_spec,
stdout_file_spec,
stderr_file_spec,
working_dir,
launch_info,
error);
m_module = module;
if (!error.Success())
return error;
int terminal = m_monitor->GetTerminalFD();
if (terminal >= 0) {
// The reader thread will close the file descriptor when done, so we pass it a copy.
int stdio = fcntl(terminal, F_DUPFD_CLOEXEC, 0);
if (stdio == -1) {
error.SetErrorToErrno();
return error;
}
SetSTDIOFileDescriptor(stdio);
}
SetID(m_monitor->GetPID());
return error;
}
static void LLVM_ATTRIBUTE_NORETURN ChildFunc(int error_fd,
const ProcessLaunchInfo &info) {
if (info.GetFlags().Test(eLaunchFlagLaunchInSeparateProcessGroup)) {
if (setpgid(0, 0) != 0)
ExitWithError(error_fd, "setpgid");
}
for (size_t i = 0; i < info.GetNumFileActions(); ++i) {
const FileAction &action = *info.GetFileActionAtIndex(i);
switch (action.GetAction()) {
case FileAction::eFileActionClose:
if (close(action.GetFD()) != 0)
ExitWithError(error_fd, "close");
break;
case FileAction::eFileActionDuplicate:
if (dup2(action.GetFD(), action.GetActionArgument()) == -1)
ExitWithError(error_fd, "dup2");
break;
case FileAction::eFileActionOpen:
DupDescriptor(error_fd, action.GetFileSpec(), action.GetFD(),
action.GetActionArgument());
break;
case FileAction::eFileActionNone:
break;
}
}
const char **argv = info.GetArguments().GetConstArgumentVector();
// Change working directory
if (info.GetWorkingDirectory() &&
0 != ::chdir(info.GetWorkingDirectory().GetCString()))
ExitWithError(error_fd, "chdir");
DisableASLRIfRequested(error_fd, info);
Environment env = info.GetEnvironment();
FixupEnvironment(env);
Environment::Envp envp = env.getEnvp();
// Clear the signal mask to prevent the child from being affected by any
// masking done by the parent.
sigset_t set;
if (sigemptyset(&set) != 0 ||
pthread_sigmask(SIG_SETMASK, &set, nullptr) != 0)
ExitWithError(error_fd, "pthread_sigmask");
if (info.GetFlags().Test(eLaunchFlagDebug)) {
// Do not inherit setgid powers.
if (setgid(getgid()) != 0)
ExitWithError(error_fd, "setgid");
// HACK:
// Close everything besides stdin, stdout, and stderr that has no file
// action to avoid leaking. Only do this when debugging, as elsewhere we
// actually rely on passing open descriptors to child processes.
for (int fd = 3; fd < sysconf(_SC_OPEN_MAX); ++fd)
if (!info.GetFileActionForFD(fd) && fd != error_fd)
close(fd);
// Start tracing this child that is about to exec.
if (ptrace(PT_TRACE_ME, 0, nullptr, 0) == -1)
ExitWithError(error_fd, "ptrace");
}
// Execute. We should never return...
execve(argv[0], const_cast<char *const *>(argv), envp);
#if defined(__linux__)
if (errno == ETXTBSY) {
// On android M and earlier we can get this error because the adb daemon
// can hold a write handle on the executable even after it has finished
// uploading it. This state lasts only a short time and happens only when
// there are many concurrent adb commands being issued, such as when
// running the test suite. (The file remains open when someone does an "adb
// shell" command in the fork() child before it has had a chance to exec.)
// Since this state should clear up quickly, wait a while and then give it
// one more go.
usleep(50000);
execve(argv[0], const_cast<char *const *>(argv), envp);
}
#endif
// ...unless exec fails. In which case we definitely need to end the child
// here.
ExitWithError(error_fd, "execve");
}
Status ProcessFreeBSD::DoLaunch(Module *module,
ProcessLaunchInfo &launch_info) {
Status error;
assert(m_monitor == NULL);
FileSpec working_dir = launch_info.GetWorkingDirectory();
if (working_dir) {
FileSystem::Instance().Resolve(working_dir);
if (!FileSystem::Instance().IsDirectory(working_dir.GetPath())) {
error.SetErrorStringWithFormat("No such file or directory: %s",
working_dir.GetCString());
return error;
}
}
SetPrivateState(eStateLaunching);
const lldb_private::FileAction *file_action;
// Default of empty will mean to use existing open file descriptors
FileSpec stdin_file_spec{};
FileSpec stdout_file_spec{};
FileSpec stderr_file_spec{};
const FileSpec dbg_pts_file_spec{launch_info.GetPTY().GetSlaveName(NULL, 0)};
file_action = launch_info.GetFileActionForFD(STDIN_FILENO);
stdin_file_spec =
GetFileSpec(file_action, stdin_file_spec, dbg_pts_file_spec);
file_action = launch_info.GetFileActionForFD(STDOUT_FILENO);
stdout_file_spec =
GetFileSpec(file_action, stdout_file_spec, dbg_pts_file_spec);
file_action = launch_info.GetFileActionForFD(STDERR_FILENO);
stderr_file_spec =
GetFileSpec(file_action, stderr_file_spec, dbg_pts_file_spec);
m_monitor = new ProcessMonitor(
this, module, launch_info.GetArguments().GetConstArgumentVector(),
launch_info.GetEnvironment(), stdin_file_spec, stdout_file_spec,
stderr_file_spec, working_dir, launch_info, error);
m_module = module;
if (!error.Success())
return error;
int terminal = m_monitor->GetTerminalFD();
if (terminal >= 0) {
// The reader thread will close the file descriptor when done, so we pass it a
// copy.
#ifdef F_DUPFD_CLOEXEC
int stdio = fcntl(terminal, F_DUPFD_CLOEXEC, 0);
if (stdio == -1) {
error.SetErrorToErrno();
return error;
}
#else
// Special case when F_DUPFD_CLOEXEC does not exist (Debian kFreeBSD)
int stdio = fcntl(terminal, F_DUPFD, 0);
if (stdio == -1) {
error.SetErrorToErrno();
return error;
}
stdio = fcntl(terminal, F_SETFD, FD_CLOEXEC);
if (stdio == -1) {
error.SetErrorToErrno();
return error;
}
#endif
SetSTDIOFileDescriptor(stdio);
}
SetID(m_monitor->GetPID());
return error;
}
static void LLVM_ATTRIBUTE_NORETURN ChildFunc(int error_fd,
const ProcessLaunchInfo &info) {
// First, make sure we disable all logging. If we are logging to stdout, our
// logs can be
// mistaken for inferior output.
Log::DisableAllLogChannels(nullptr);
// Do not inherit setgid powers.
if (setgid(getgid()) != 0)
ExitWithError(error_fd, "setgid");
if (info.GetFlags().Test(eLaunchFlagLaunchInSeparateProcessGroup)) {
if (setpgid(0, 0) != 0)
ExitWithError(error_fd, "setpgid");
}
for (size_t i = 0; i < info.GetNumFileActions(); ++i) {
const FileAction &action = *info.GetFileActionAtIndex(i);
switch (action.GetAction()) {
case FileAction::eFileActionClose:
if (close(action.GetFD()) != 0)
ExitWithError(error_fd, "close");
break;
case FileAction::eFileActionDuplicate:
if (dup2(action.GetFD(), action.GetActionArgument()) == -1)
ExitWithError(error_fd, "dup2");
break;
case FileAction::eFileActionOpen:
DupDescriptor(error_fd, action.GetFileSpec(), action.GetFD(),
action.GetActionArgument());
break;
case FileAction::eFileActionNone:
break;
}
}
const char **argv = info.GetArguments().GetConstArgumentVector();
// Change working directory
if (info.GetWorkingDirectory() &&
0 != ::chdir(info.GetWorkingDirectory().GetCString()))
ExitWithError(error_fd, "chdir");
// Disable ASLR if requested.
if (info.GetFlags().Test(lldb::eLaunchFlagDisableASLR)) {
const unsigned long personality_get_current = 0xffffffff;
int value = personality(personality_get_current);
if (value == -1)
ExitWithError(error_fd, "personality get");
value = personality(ADDR_NO_RANDOMIZE | value);
if (value == -1)
ExitWithError(error_fd, "personality set");
}
Args env = info.GetEnvironmentEntries();
FixupEnvironment(env);
const char **envp = env.GetConstArgumentVector();
// Clear the signal mask to prevent the child from being affected by
// any masking done by the parent.
sigset_t set;
if (sigemptyset(&set) != 0 ||
pthread_sigmask(SIG_SETMASK, &set, nullptr) != 0)
ExitWithError(error_fd, "pthread_sigmask");
if (info.GetFlags().Test(eLaunchFlagDebug)) {
// HACK:
// Close everything besides stdin, stdout, and stderr that has no file
// action to avoid leaking. Only do this when debugging, as elsewhere we
// actually rely on
// passing open descriptors to child processes.
for (int fd = 3; fd < sysconf(_SC_OPEN_MAX); ++fd)
if (!info.GetFileActionForFD(fd) && fd != error_fd)
close(fd);
// Start tracing this child that is about to exec.
if (ptrace(PTRACE_TRACEME, 0, nullptr, nullptr) == -1)
ExitWithError(error_fd, "ptrace");
}
// Execute. We should never return...
execve(argv[0], const_cast<char *const *>(argv),
const_cast<char *const *>(envp));
if (errno == ETXTBSY) {
// On android M and earlier we can get this error because the adb deamon can
// hold a write
// handle on the executable even after it has finished uploading it. This
// state lasts
// only a short time and happens only when there are many concurrent adb
// commands being
// issued, such as when running the test suite. (The file remains open when
// someone does
// an "adb shell" command in the fork() child before it has had a chance to
// exec.) Since
// this state should clear up quickly, wait a while and then give it one
// more go.
usleep(50000);
execve(argv[0], const_cast<char *const *>(argv),
const_cast<char *const *>(envp));
}
// ...unless exec fails. In which case we definitely need to end the child
// here.
ExitWithError(error_fd, "execve");
}
