contrib/llvm/tools/lldb/source/Host/posix/HostProcessPosix.cpp

   1 //===-- HostProcessPosix.cpp ------------------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "lldb/Host/Host.h"
  11 #include "lldb/Host/posix/HostProcessPosix.h"
  12 #include "lldb/Host/FileSystem.h"
  13
  14 #include "llvm/ADT/STLExtras.h"
  15
  16 #include <limits.h>
  17
  18 using namespace lldb_private;
  19
  20 namespace
  21 {
  22     const int kInvalidPosixProcess = 0;
  23 }
  24
  25 HostProcessPosix::HostProcessPosix()
  26     : HostNativeProcessBase(kInvalidPosixProcess)
  27 {
  28 }
  29
  30 HostProcessPosix::HostProcessPosix(lldb::process_t process)
  31     : HostNativeProcessBase(process)
  32 {
  33 }
  34
  35 HostProcessPosix::~HostProcessPosix()
  36 {
  37 }
  38
  39 Error HostProcessPosix::Signal(int signo) const
  40 {
  41     if (m_process == kInvalidPosixProcess)
  42     {
  43         Error error;
  44         error.SetErrorString("HostProcessPosix refers to an invalid process");
  45         return error;
  46     }
  47
  48     return HostProcessPosix::Signal(m_process, signo);
  49 }
  50
  51 Error HostProcessPosix::Signal(lldb::process_t process, int signo)
  52 {
  53     Error error;
  54
  55     if (-1 == ::kill(process, signo))
  56         error.SetErrorToErrno();
  57
  58     return error;
  59 }
  60
  61 Error HostProcessPosix::Terminate()
  62 {
  63     return Signal(SIGKILL);
  64 }
  65
  66 Error HostProcessPosix::GetMainModule(FileSpec &file_spec) const
  67 {
  68     Error error;
  69
  70     // Use special code here because proc/[pid]/exe is a symbolic link.
  71     char link_path[PATH_MAX];
  72     char exe_path[PATH_MAX] = "";
  73     if (snprintf (link_path, PATH_MAX, "/proc/%" PRIu64 "/exe", m_process) <= 0)
  74     {
  75         error.SetErrorString("Unable to build /proc/<pid>/exe string");
  76         return error;
  77     }
  78
  79     error = FileSystem::Readlink(link_path, exe_path, llvm::array_lengthof(exe_path));
  80     if (!error.Success())
  81         return error;
  82
  83     const ssize_t len = strlen(exe_path);
  84     // If the binary has been deleted, the link name has " (deleted)" appended.
  85     // Remove if there.
  86     static const ssize_t deleted_len = strlen(" (deleted)");
  87     if (len > deleted_len &&
  88         !strcmp(exe_path + len - deleted_len, " (deleted)"))
  89     {
  90         exe_path[len - deleted_len] = 0;
  91     }
  92
  93     file_spec.SetFile(exe_path, false);
  94     return error;
  95 }
  96
  97 lldb::pid_t HostProcessPosix::GetProcessId() const
  98 {
  99     return m_process;
 100 }
 101
 102 bool HostProcessPosix::IsRunning() const
 103 {
 104     if (m_process == kInvalidPosixProcess)
 105         return false;
 106
 107     // Send this process the null signal.  If it succeeds the process is running.
 108     Error error = Signal(0);
 109     return error.Success();
 110 }
 111
 112 HostThread
 113 HostProcessPosix::StartMonitoring(HostProcess::MonitorCallback callback, void *callback_baton, bool monitor_signals)
 114 {
 115     return Host::StartMonitoringChildProcess(callback, callback_baton, m_process, monitor_signals);
 116 }