1 //===-- HostProcessWindows.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/posix/HostProcessPosix.h"
11 #include "lldb/Host/FileSystem.h"
12 
13 #include "llvm/ADT/STLExtras.h"
14 
15 #include <limits.h>
16 
17 using namespace lldb_private;
18 
19 const lldb::pid_t HostProcessPosix::kInvalidProcessId = 0;
20 
21 HostProcessPosix::HostProcessPosix()
22 : m_pid(kInvalidProcessId)
23 {
24 }
25 
26 HostProcessPosix::~HostProcessPosix()
27 {
28 }
29 
30 Error HostProcessPosix::Create(lldb::pid_t pid)
31 {
32     Error error;
33     if (pid == kInvalidProcessId)
34         error.SetErrorString("Attempt to create an invalid process");
35 
36     m_pid = pid;
37     return error;
38 }
39 
40 Error HostProcessPosix::Signal(int signo) const
41 {
42     if (m_pid <= 0)
43     {
44         Error error;
45         error.SetErrorString("HostProcessPosix refers to an invalid process");
46         return error;
47     }
48 
49     return HostProcessPosix::Signal(m_pid, signo);
50 }
51 
52 Error HostProcessPosix::Signal(lldb::pid_t pid, int signo)
53 {
54     Error error;
55 
56     if (-1 == ::kill(pid, signo))
57         error.SetErrorToErrno();
58 
59     return error;
60 }
61 
62 Error HostProcessPosix::GetMainModule(FileSpec &file_spec) const
63 {
64     Error error;
65 
66     // Use special code here because proc/[pid]/exe is a symbolic link.
67     char link_path[PATH_MAX];
68     char exe_path[PATH_MAX] = "";
69     if (snprintf (link_path, PATH_MAX, "/proc/%" PRIu64 "/exe", m_pid) <= 0)
70     {
71         error.SetErrorString("Unable to build /proc/<pid>/exe string");
72         return error;
73     }
74 
75     error = FileSystem::Readlink(link_path, exe_path, llvm::array_lengthof(exe_path));
76     if (!error.Success())
77         return error;
78 
79     const ssize_t len = strlen(exe_path);
80     // If the binary has been deleted, the link name has " (deleted)" appended.
81     // Remove if there.
82     static const ssize_t deleted_len = strlen(" (deleted)");
83     if (len > deleted_len &&
84         !strcmp(exe_path + len - deleted_len, " (deleted)"))
85     {
86         exe_path[len - deleted_len] = 0;
87     }
88 
89     file_spec.SetFile(exe_path, false);
90     return error;
91 }
92 
93 lldb::pid_t HostProcessPosix::GetProcessId() const
94 {
95     return m_pid;
96 }
97 
98 bool HostProcessPosix::IsRunning() const
99 {
100     // Send this process the null signal.  If it succeeds the process is running.
101     Error error = Signal(0);
102     return error.Success();
103 }
104