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 }
117