1 //===-- ProcessLaunchInfo.cpp ---------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include <climits>
10
11 #include "lldb/Host/Config.h"
12 #include "lldb/Host/FileAction.h"
13 #include "lldb/Host/FileSystem.h"
14 #include "lldb/Host/HostInfo.h"
15 #include "lldb/Host/ProcessLaunchInfo.h"
16 #include "lldb/Utility/LLDBLog.h"
17 #include "lldb/Utility/Log.h"
18 #include "lldb/Utility/StreamString.h"
19
20 #include "llvm/Support/ConvertUTF.h"
21 #include "llvm/Support/FileSystem.h"
22
23 #if !defined(_WIN32)
24 #include <climits>
25 #endif
26
27 using namespace lldb;
28 using namespace lldb_private;
29
30 // ProcessLaunchInfo member functions
31
ProcessLaunchInfo()32 ProcessLaunchInfo::ProcessLaunchInfo()
33 : ProcessInfo(), m_working_dir(), m_plugin_name(), m_flags(0),
34 m_file_actions(), m_pty(new PseudoTerminal), m_monitor_callback(nullptr),
35 m_listener_sp(), m_hijack_listener_sp(), m_scripted_process_class_name(),
36 m_scripted_process_dictionary_sp() {}
37
ProcessLaunchInfo(const FileSpec & stdin_file_spec,const FileSpec & stdout_file_spec,const FileSpec & stderr_file_spec,const FileSpec & working_directory,uint32_t launch_flags)38 ProcessLaunchInfo::ProcessLaunchInfo(const FileSpec &stdin_file_spec,
39 const FileSpec &stdout_file_spec,
40 const FileSpec &stderr_file_spec,
41 const FileSpec &working_directory,
42 uint32_t launch_flags)
43 : ProcessInfo(), m_working_dir(), m_plugin_name(), m_flags(launch_flags),
44 m_file_actions(), m_pty(new PseudoTerminal),
45 m_scripted_process_class_name(), m_scripted_process_dictionary_sp() {
46 if (stdin_file_spec) {
47 FileAction file_action;
48 const bool read = true;
49 const bool write = false;
50 if (file_action.Open(STDIN_FILENO, stdin_file_spec, read, write))
51 AppendFileAction(file_action);
52 }
53 if (stdout_file_spec) {
54 FileAction file_action;
55 const bool read = false;
56 const bool write = true;
57 if (file_action.Open(STDOUT_FILENO, stdout_file_spec, read, write))
58 AppendFileAction(file_action);
59 }
60 if (stderr_file_spec) {
61 FileAction file_action;
62 const bool read = false;
63 const bool write = true;
64 if (file_action.Open(STDERR_FILENO, stderr_file_spec, read, write))
65 AppendFileAction(file_action);
66 }
67 if (working_directory)
68 SetWorkingDirectory(working_directory);
69 }
70
AppendCloseFileAction(int fd)71 bool ProcessLaunchInfo::AppendCloseFileAction(int fd) {
72 FileAction file_action;
73 if (file_action.Close(fd)) {
74 AppendFileAction(file_action);
75 return true;
76 }
77 return false;
78 }
79
AppendDuplicateFileAction(int fd,int dup_fd)80 bool ProcessLaunchInfo::AppendDuplicateFileAction(int fd, int dup_fd) {
81 FileAction file_action;
82 if (file_action.Duplicate(fd, dup_fd)) {
83 AppendFileAction(file_action);
84 return true;
85 }
86 return false;
87 }
88
AppendOpenFileAction(int fd,const FileSpec & file_spec,bool read,bool write)89 bool ProcessLaunchInfo::AppendOpenFileAction(int fd, const FileSpec &file_spec,
90 bool read, bool write) {
91 FileAction file_action;
92 if (file_action.Open(fd, file_spec, read, write)) {
93 AppendFileAction(file_action);
94 return true;
95 }
96 return false;
97 }
98
AppendSuppressFileAction(int fd,bool read,bool write)99 bool ProcessLaunchInfo::AppendSuppressFileAction(int fd, bool read,
100 bool write) {
101 FileAction file_action;
102 if (file_action.Open(fd, FileSpec(FileSystem::DEV_NULL), read, write)) {
103 AppendFileAction(file_action);
104 return true;
105 }
106 return false;
107 }
108
GetFileActionAtIndex(size_t idx) const109 const FileAction *ProcessLaunchInfo::GetFileActionAtIndex(size_t idx) const {
110 if (idx < m_file_actions.size())
111 return &m_file_actions[idx];
112 return nullptr;
113 }
114
GetFileActionForFD(int fd) const115 const FileAction *ProcessLaunchInfo::GetFileActionForFD(int fd) const {
116 for (size_t idx = 0, count = m_file_actions.size(); idx < count; ++idx) {
117 if (m_file_actions[idx].GetFD() == fd)
118 return &m_file_actions[idx];
119 }
120 return nullptr;
121 }
122
GetWorkingDirectory() const123 const FileSpec &ProcessLaunchInfo::GetWorkingDirectory() const {
124 return m_working_dir;
125 }
126
SetWorkingDirectory(const FileSpec & working_dir)127 void ProcessLaunchInfo::SetWorkingDirectory(const FileSpec &working_dir) {
128 m_working_dir = working_dir;
129 }
130
GetProcessPluginName() const131 const char *ProcessLaunchInfo::GetProcessPluginName() const {
132 return (m_plugin_name.empty() ? nullptr : m_plugin_name.c_str());
133 }
134
SetProcessPluginName(llvm::StringRef plugin)135 void ProcessLaunchInfo::SetProcessPluginName(llvm::StringRef plugin) {
136 m_plugin_name = std::string(plugin);
137 }
138
GetShell() const139 const FileSpec &ProcessLaunchInfo::GetShell() const { return m_shell; }
140
SetShell(const FileSpec & shell)141 void ProcessLaunchInfo::SetShell(const FileSpec &shell) {
142 m_shell = shell;
143 if (m_shell) {
144 FileSystem::Instance().ResolveExecutableLocation(m_shell);
145 m_flags.Set(lldb::eLaunchFlagLaunchInShell);
146 } else
147 m_flags.Clear(lldb::eLaunchFlagLaunchInShell);
148 }
149
SetLaunchInSeparateProcessGroup(bool separate)150 void ProcessLaunchInfo::SetLaunchInSeparateProcessGroup(bool separate) {
151 if (separate)
152 m_flags.Set(lldb::eLaunchFlagLaunchInSeparateProcessGroup);
153 else
154 m_flags.Clear(lldb::eLaunchFlagLaunchInSeparateProcessGroup);
155 }
156
SetShellExpandArguments(bool expand)157 void ProcessLaunchInfo::SetShellExpandArguments(bool expand) {
158 if (expand)
159 m_flags.Set(lldb::eLaunchFlagShellExpandArguments);
160 else
161 m_flags.Clear(lldb::eLaunchFlagShellExpandArguments);
162 }
163
Clear()164 void ProcessLaunchInfo::Clear() {
165 ProcessInfo::Clear();
166 m_working_dir.Clear();
167 m_plugin_name.clear();
168 m_shell.Clear();
169 m_flags.Clear();
170 m_file_actions.clear();
171 m_resume_count = 0;
172 m_listener_sp.reset();
173 m_hijack_listener_sp.reset();
174 m_scripted_process_class_name.clear();
175 m_scripted_process_dictionary_sp.reset();
176 }
177
NoOpMonitorCallback(lldb::pid_t pid,int signal,int status)178 void ProcessLaunchInfo::NoOpMonitorCallback(lldb::pid_t pid, int signal,
179 int status) {
180 Log *log = GetLog(LLDBLog::Process);
181 LLDB_LOG(log, "pid = {0}, signal = {1}, status = {2}", pid, signal, status);
182 }
183
MonitorProcess() const184 bool ProcessLaunchInfo::MonitorProcess() const {
185 if (m_monitor_callback && ProcessIDIsValid()) {
186 llvm::Expected<HostThread> maybe_thread =
187 Host::StartMonitoringChildProcess(m_monitor_callback, GetProcessID());
188 if (!maybe_thread)
189 LLDB_LOG(GetLog(LLDBLog::Host), "failed to launch host thread: {}",
190 llvm::toString(maybe_thread.takeError()));
191 return true;
192 }
193 return false;
194 }
195
SetDetachOnError(bool enable)196 void ProcessLaunchInfo::SetDetachOnError(bool enable) {
197 if (enable)
198 m_flags.Set(lldb::eLaunchFlagDetachOnError);
199 else
200 m_flags.Clear(lldb::eLaunchFlagDetachOnError);
201 }
202
SetUpPtyRedirection()203 llvm::Error ProcessLaunchInfo::SetUpPtyRedirection() {
204 Log *log = GetLog(LLDBLog::Process);
205
206 bool stdin_free = GetFileActionForFD(STDIN_FILENO) == nullptr;
207 bool stdout_free = GetFileActionForFD(STDOUT_FILENO) == nullptr;
208 bool stderr_free = GetFileActionForFD(STDERR_FILENO) == nullptr;
209 bool any_free = stdin_free || stdout_free || stderr_free;
210 if (!any_free)
211 return llvm::Error::success();
212
213 LLDB_LOG(log, "Generating a pty to use for stdin/out/err");
214
215 int open_flags = O_RDWR | O_NOCTTY;
216 #if !defined(_WIN32)
217 // We really shouldn't be specifying platform specific flags that are
218 // intended for a system call in generic code. But this will have to
219 // do for now.
220 open_flags |= O_CLOEXEC;
221 #endif
222 if (llvm::Error Err = m_pty->OpenFirstAvailablePrimary(open_flags))
223 return Err;
224
225 const FileSpec secondary_file_spec(m_pty->GetSecondaryName());
226
227 if (stdin_free)
228 AppendOpenFileAction(STDIN_FILENO, secondary_file_spec, true, false);
229
230 if (stdout_free)
231 AppendOpenFileAction(STDOUT_FILENO, secondary_file_spec, false, true);
232
233 if (stderr_free)
234 AppendOpenFileAction(STDERR_FILENO, secondary_file_spec, false, true);
235 return llvm::Error::success();
236 }
237
ConvertArgumentsForLaunchingInShell(Status & error,bool will_debug,bool first_arg_is_full_shell_command,uint32_t num_resumes)238 bool ProcessLaunchInfo::ConvertArgumentsForLaunchingInShell(
239 Status &error, bool will_debug, bool first_arg_is_full_shell_command,
240 uint32_t num_resumes) {
241 error.Clear();
242
243 if (GetFlags().Test(eLaunchFlagLaunchInShell)) {
244 if (m_shell) {
245 std::string shell_executable = m_shell.GetPath();
246
247 const char **argv = GetArguments().GetConstArgumentVector();
248 if (argv == nullptr || argv[0] == nullptr)
249 return false;
250 Args shell_arguments;
251 shell_arguments.AppendArgument(shell_executable);
252 const llvm::Triple &triple = GetArchitecture().GetTriple();
253 if (triple.getOS() == llvm::Triple::Win32 &&
254 !triple.isWindowsCygwinEnvironment())
255 shell_arguments.AppendArgument(llvm::StringRef("/C"));
256 else
257 shell_arguments.AppendArgument(llvm::StringRef("-c"));
258
259 StreamString shell_command;
260 if (will_debug) {
261 // Add a modified PATH environment variable in case argv[0] is a
262 // relative path.
263 const char *argv0 = argv[0];
264 FileSpec arg_spec(argv0);
265 if (arg_spec.IsRelative()) {
266 // We have a relative path to our executable which may not work if we
267 // just try to run "a.out" (without it being converted to "./a.out")
268 FileSpec working_dir = GetWorkingDirectory();
269 // Be sure to put quotes around PATH's value in case any paths have
270 // spaces...
271 std::string new_path("PATH=\"");
272 const size_t empty_path_len = new_path.size();
273
274 if (working_dir) {
275 new_path += working_dir.GetPath();
276 } else {
277 llvm::SmallString<64> cwd;
278 if (! llvm::sys::fs::current_path(cwd))
279 new_path += cwd;
280 }
281 std::string curr_path;
282 if (HostInfo::GetEnvironmentVar("PATH", curr_path)) {
283 if (new_path.size() > empty_path_len)
284 new_path += ':';
285 new_path += curr_path;
286 }
287 new_path += "\" ";
288 shell_command.PutCString(new_path);
289 }
290
291 if (triple.getOS() != llvm::Triple::Win32 ||
292 triple.isWindowsCygwinEnvironment())
293 shell_command.PutCString("exec");
294
295 // Only Apple supports /usr/bin/arch being able to specify the
296 // architecture
297 if (GetArchitecture().IsValid() && // Valid architecture
298 GetArchitecture().GetTriple().getVendor() ==
299 llvm::Triple::Apple && // Apple only
300 GetArchitecture().GetCore() !=
301 ArchSpec::eCore_x86_64_x86_64h) // Don't do this for x86_64h
302 {
303 shell_command.Printf(" /usr/bin/arch -arch %s",
304 GetArchitecture().GetArchitectureName());
305 // Set the resume count to 2:
306 // 1 - stop in shell
307 // 2 - stop in /usr/bin/arch
308 // 3 - then we will stop in our program
309 SetResumeCount(num_resumes + 1);
310 } else {
311 // Set the resume count to 1:
312 // 1 - stop in shell
313 // 2 - then we will stop in our program
314 SetResumeCount(num_resumes);
315 }
316 }
317
318 if (first_arg_is_full_shell_command) {
319 // There should only be one argument that is the shell command itself
320 // to be used as is
321 if (argv[0] && !argv[1])
322 shell_command.Printf("%s", argv[0]);
323 else
324 return false;
325 } else {
326 for (size_t i = 0; argv[i] != nullptr; ++i) {
327 std::string safe_arg = Args::GetShellSafeArgument(m_shell, argv[i]);
328 // Add a space to separate this arg from the previous one.
329 shell_command.PutCString(" ");
330 shell_command.PutCString(safe_arg);
331 }
332 }
333 shell_arguments.AppendArgument(shell_command.GetString());
334 m_executable = m_shell;
335 m_arguments = shell_arguments;
336 return true;
337 } else {
338 error.SetErrorString("invalid shell path");
339 }
340 } else {
341 error.SetErrorString("not launching in shell");
342 }
343 return false;
344 }
345