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/FileSystem.h"
12 #include "lldb/Host/posix/HostProcessPosix.h"
13 
14 #include "llvm/ADT/STLExtras.h"
15 
16 #include <csignal>
17 #include <limits.h>
18 #include <unistd.h>
19 
20 using namespace lldb_private;
21 
22 namespace {
23 const int kInvalidPosixProcess = 0;
24 }
25 
26 HostProcessPosix::HostProcessPosix()
27     : HostNativeProcessBase(kInvalidPosixProcess) {}
28 
29 HostProcessPosix::HostProcessPosix(lldb::process_t process)
30     : HostNativeProcessBase(process) {}
31 
32 HostProcessPosix::~HostProcessPosix() {}
33 
34 Status HostProcessPosix::Signal(int signo) const {
35   if (m_process == kInvalidPosixProcess) {
36     Status error;
37     error.SetErrorString("HostProcessPosix refers to an invalid process");
38     return error;
39   }
40 
41   return HostProcessPosix::Signal(m_process, signo);
42 }
43 
44 Status HostProcessPosix::Signal(lldb::process_t process, int signo) {
45   Status error;
46 
47   if (-1 == ::kill(process, signo))
48     error.SetErrorToErrno();
49 
50   return error;
51 }
52 
53 Status HostProcessPosix::Terminate() { return Signal(SIGKILL); }
54 
55 Status HostProcessPosix::GetMainModule(FileSpec &file_spec) const {
56   Status error;
57 
58   // Use special code here because proc/[pid]/exe is a symbolic link.
59   char link_path[PATH_MAX];
60   if (snprintf(link_path, PATH_MAX, "/proc/%" PRIu64 "/exe", m_process) != 1) {
61     error.SetErrorString("Unable to build /proc/<pid>/exe string");
62     return error;
63   }
64 
65   error = FileSystem::Readlink(FileSpec{link_path, false}, file_spec);
66   if (!error.Success())
67     return error;
68 
69   // If the binary has been deleted, the link name has " (deleted)" appended.
70   // Remove if there.
71   if (file_spec.GetFilename().GetStringRef().endswith(" (deleted)")) {
72     const char *filename = file_spec.GetFilename().GetCString();
73     static const size_t deleted_len = strlen(" (deleted)");
74     const size_t len = file_spec.GetFilename().GetLength();
75     file_spec.GetFilename().SetCStringWithLength(filename, len - deleted_len);
76   }
77   return error;
78 }
79 
80 lldb::pid_t HostProcessPosix::GetProcessId() const { return m_process; }
81 
82 bool HostProcessPosix::IsRunning() const {
83   if (m_process == kInvalidPosixProcess)
84     return false;
85 
86   // Send this process the null signal.  If it succeeds the process is running.
87   Status error = Signal(0);
88   return error.Success();
89 }
90 
91 HostThread HostProcessPosix::StartMonitoring(
92     const Host::MonitorChildProcessCallback &callback, bool monitor_signals) {
93   return Host::StartMonitoringChildProcess(callback, m_process,
94                                            monitor_signals);
95 }
96