1 //===-- HostProcessPosix.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 "lldb/Host/Host.h" 10 #include "lldb/Host/FileSystem.h" 11 #include "lldb/Host/posix/HostProcessPosix.h" 12 13 #include "llvm/ADT/STLExtras.h" 14 15 #include <climits> 16 #include <csignal> 17 #include <unistd.h> 18 19 using namespace lldb_private; 20 21 static const int kInvalidPosixProcess = 0; 22 23 HostProcessPosix::HostProcessPosix() 24 : HostNativeProcessBase(kInvalidPosixProcess) {} 25 26 HostProcessPosix::HostProcessPosix(lldb::process_t process) 27 : HostNativeProcessBase(process) {} 28 29 HostProcessPosix::~HostProcessPosix() = default; 30 31 Status HostProcessPosix::Signal(int signo) const { 32 if (m_process == kInvalidPosixProcess) { 33 Status error; 34 error.SetErrorString("HostProcessPosix refers to an invalid process"); 35 return error; 36 } 37 38 return HostProcessPosix::Signal(m_process, signo); 39 } 40 41 Status HostProcessPosix::Signal(lldb::process_t process, int signo) { 42 Status error; 43 44 if (-1 == ::kill(process, signo)) 45 error.SetErrorToErrno(); 46 47 return error; 48 } 49 50 Status HostProcessPosix::Terminate() { return Signal(SIGKILL); } 51 52 Status HostProcessPosix::GetMainModule(FileSpec &file_spec) const { 53 Status error; 54 55 // Use special code here because proc/[pid]/exe is a symbolic link. 56 char link_path[PATH_MAX]; 57 if (snprintf(link_path, PATH_MAX, "/proc/%" PRIu64 "/exe", m_process) != 1) { 58 error.SetErrorString("Unable to build /proc/<pid>/exe string"); 59 return error; 60 } 61 62 error = FileSystem::Instance().Readlink(FileSpec(link_path), file_spec); 63 if (!error.Success()) 64 return error; 65 66 // If the binary has been deleted, the link name has " (deleted)" appended. 67 // Remove if there. 68 if (file_spec.GetFilename().GetStringRef().endswith(" (deleted)")) { 69 const char *filename = file_spec.GetFilename().GetCString(); 70 static const size_t deleted_len = strlen(" (deleted)"); 71 const size_t len = file_spec.GetFilename().GetLength(); 72 file_spec.GetFilename().SetCStringWithLength(filename, len - deleted_len); 73 } 74 return error; 75 } 76 77 lldb::pid_t HostProcessPosix::GetProcessId() const { return m_process; } 78 79 bool HostProcessPosix::IsRunning() const { 80 if (m_process == kInvalidPosixProcess) 81 return false; 82 83 // Send this process the null signal. If it succeeds the process is running. 84 Status error = Signal(0); 85 return error.Success(); 86 } 87 88 llvm::Expected<HostThread> HostProcessPosix::StartMonitoring( 89 const Host::MonitorChildProcessCallback &callback, bool monitor_signals) { 90 return Host::StartMonitoringChildProcess(callback, m_process, 91 monitor_signals); 92 } 93