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     if (snprintf(link_path, PATH_MAX, "/proc/%" PRIu64 "/exe", m_process) != 1)
73     {
74         error.SetErrorString("Unable to build /proc/<pid>/exe string");
75         return error;
76     }
77 
78     error = FileSystem::Readlink(FileSpec{link_path, false}, file_spec);
79     if (!error.Success())
80         return error;
81 
82     // If the binary has been deleted, the link name has " (deleted)" appended.
83     // Remove if there.
84     if (file_spec.GetFilename().GetStringRef().endswith(" (deleted)"))
85     {
86         const char *filename = file_spec.GetFilename().GetCString();
87         static const size_t deleted_len = strlen(" (deleted)");
88         const size_t len = file_spec.GetFilename().GetLength();
89         file_spec.GetFilename().SetCStringWithLength(filename, len - deleted_len);
90     }
91     return error;
92 }
93 
94 lldb::pid_t HostProcessPosix::GetProcessId() const
95 {
96     return m_process;
97 }
98 
99 bool HostProcessPosix::IsRunning() const
100 {
101     if (m_process == kInvalidPosixProcess)
102         return false;
103 
104     // Send this process the null signal.  If it succeeds the process is running.
105     Error error = Signal(0);
106     return error.Success();
107 }
108 
109 HostThread
110 HostProcessPosix::StartMonitoring(HostProcess::MonitorCallback callback, void *callback_baton, bool monitor_signals)
111 {
112     return Host::StartMonitoringChildProcess(callback, callback_baton, m_process, monitor_signals);
113 }
114