1 //===-- HostProcessPosix.cpp ----------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "lldb/Host/Host.h"
10 #include "lldb/Host/FileSystem.h"
11 #include "lldb/Host/posix/HostProcessPosix.h"
12
13 #include "llvm/ADT/STLExtras.h"
14
15 #include <climits>
16 #include <csignal>
17 #include <unistd.h>
18
19 using namespace lldb_private;
20
21 namespace {
22 const int kInvalidPosixProcess = 0;
23 }
24
HostProcessPosix()25 HostProcessPosix::HostProcessPosix()
26 : HostNativeProcessBase(kInvalidPosixProcess) {}
27
HostProcessPosix(lldb::process_t process)28 HostProcessPosix::HostProcessPosix(lldb::process_t process)
29 : HostNativeProcessBase(process) {}
30
31 HostProcessPosix::~HostProcessPosix() = default;
32
Signal(int signo) const33 Status HostProcessPosix::Signal(int signo) const {
34 if (m_process == kInvalidPosixProcess) {
35 Status error;
36 error.SetErrorString("HostProcessPosix refers to an invalid process");
37 return error;
38 }
39
40 return HostProcessPosix::Signal(m_process, signo);
41 }
42
Signal(lldb::process_t process,int signo)43 Status HostProcessPosix::Signal(lldb::process_t process, int signo) {
44 Status error;
45
46 if (-1 == ::kill(process, signo))
47 error.SetErrorToErrno();
48
49 return error;
50 }
51
Terminate()52 Status HostProcessPosix::Terminate() { return Signal(SIGKILL); }
53
GetMainModule(FileSpec & file_spec) const54 Status HostProcessPosix::GetMainModule(FileSpec &file_spec) const {
55 Status error;
56
57 // Use special code here because proc/[pid]/exe is a symbolic link.
58 char link_path[PATH_MAX];
59 if (snprintf(link_path, PATH_MAX, "/proc/%" PRIu64 "/exe", m_process) != 1) {
60 error.SetErrorString("Unable to build /proc/<pid>/exe string");
61 return error;
62 }
63
64 error = FileSystem::Instance().Readlink(FileSpec(link_path), file_spec);
65 if (!error.Success())
66 return error;
67
68 // If the binary has been deleted, the link name has " (deleted)" appended.
69 // Remove if there.
70 if (file_spec.GetFilename().GetStringRef().endswith(" (deleted)")) {
71 const char *filename = file_spec.GetFilename().GetCString();
72 static const size_t deleted_len = strlen(" (deleted)");
73 const size_t len = file_spec.GetFilename().GetLength();
74 file_spec.GetFilename().SetCStringWithLength(filename, len - deleted_len);
75 }
76 return error;
77 }
78
GetProcessId() const79 lldb::pid_t HostProcessPosix::GetProcessId() const { return m_process; }
80
IsRunning() const81 bool HostProcessPosix::IsRunning() const {
82 if (m_process == kInvalidPosixProcess)
83 return false;
84
85 // Send this process the null signal. If it succeeds the process is running.
86 Status error = Signal(0);
87 return error.Success();
88 }
89
StartMonitoring(const Host::MonitorChildProcessCallback & callback,bool monitor_signals)90 llvm::Expected<HostThread> HostProcessPosix::StartMonitoring(
91 const Host::MonitorChildProcessCallback &callback, bool monitor_signals) {
92 return Host::StartMonitoringChildProcess(callback, m_process,
93 monitor_signals);
94 }
95