Module: MoreCoreExtensions::ProcessPauseResume

Defined in:
lib/more_core_extensions/core_ext/process/pause_resume.rb

Instance Method Summary collapse

Instance Method Details

#alive?(pid) ⇒ Boolean

Returns whether or not the given process is running.

Returns:

  • (Boolean) 


47
48
49
50
51
52
 
# File 'lib/more_core_extensions/core_ext/process/pause_resume.rb', line 47

def alive?(pid)
  Process.kill(0, pid)
  true
rescue Errno::ESRCH
  false
end

#pause(pid) ⇒ Object 



57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
 
# File 'lib/more_core_extensions/core_ext/process/pause_resume.rb', line 57

def pause(pid)
  return unless alive?(pid)

  begin
    handle = OpenProcess.call(PROCESS_SUSPEND_RESUME, 0, pid)

    if handle == 0
      raise SystemCallError, Fiddle.win32_last_error, "OpenProcess"
    end

    if NtSuspendProcess.call(handle) != 0
      raise SystemCallError, Fiddle.win32_last_error, "NtSuspendProcess"
    end
  ensure
    CloseHandle.call(handle) if handle
  end
  1 # For cross-platform compatibility
end

#resume(pid) ⇒ Object 



84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
 
# File 'lib/more_core_extensions/core_ext/process/pause_resume.rb', line 84

def resume(pid)
  return unless alive?(pid)

  begin
    handle = OpenProcess.call(PROCESS_SUSPEND_RESUME, 0, pid)

    if handle == 0
      raise SystemCallError, Fiddle.win32_last_error, "OpenProcess"
    end

    if NtResumeProcess.call(handle) != 0
      raise SystemCallError, Fiddle.win32_last_error, "NtResumeProcess"
    end
  ensure
    CloseHandle.call(handle) if handle
  end
  1 # For cross-platform compatibility
end