Module: Process

Extended by:

Constants, Functions, Structs

Includes:

Constants

Defined in:

lib/win32/process.rb

Defined Under Namespace

Modules: Constants, Functions, Structs

Constant Summary

WIN32_PROCESS_VERSION =

The version of the win32-process library.

'0.7.2'

Class Method Summary

• .create(args) ⇒ Object

  Process.create(key => value, …) => ProcessInfo.

• .get_affinity(int = Process.pid) ⇒ Object

  Returns the process and system affinity mask for the given pid, or the current process if no pid is provided.

• .getpriority(kind, int) ⇒ Object

  Retrieves the priority class for the specified process id int.

• .getrlimit(resource) ⇒ Object

  Gets the resource limit of the current process.

• .job? ⇒ Boolean

  Returns whether or not the current process is part of a Job (process group).

• .kill(signal, *pids) ⇒ Object

  Kill a given process with a specific signal.

• .setpriority(kind, int, int_priority) ⇒ Object

  Sets the priority class for the specified process id int.

• .setrlimit(resource, current_limit, max_limit = nil) ⇒ Object

  Sets the resource limit of the current process.

• .uid(sid = false) ⇒ Object

  Returns the uid of the current process.

Class Method Details

.create(args) ⇒ Object

Process.create(key => value, …) => ProcessInfo

This is a wrapper for the CreateProcess() function. It executes a process, returning a ProcessInfo struct. It accepts a hash as an argument. There are several primary keys:

• command_line (this or app_name must be present)

• app_name (default: nil)

• inherit (default: false)

• process_inherit (default: false)

• thread_inherit (default: false)

• creation_flags (default: 0)

• cwd (default: Dir.pwd)

• startup_info (default: nil)

• environment (default: nil)

• close_handles (default: true)

• with_logon (default: nil)

• domain (default: nil)

• password (default: nil, mandatory if with_logon)

Of these, the ‘command_line’ or ‘app_name’ must be specified or an error is raised. Both may be set individually, but ‘command_line’ should be preferred if only one of them is set because it does not (necessarily) require an explicit path or extension to work.

The ‘domain’ and ‘password’ options are only relevent in the context of ‘with_logon’. If ‘with_logon’ is set, then the ‘password’ option is mandatory.

The startup_info key takes a hash. Its keys are attributes that are part of the StartupInfo struct, and are generally only meaningful for GUI or console processes. See the documentation on CreateProcess() and the StartupInfo struct on MSDN for more information.

• desktop

• title

• x

• y

• x_size

• y_size

• x_count_chars

• y_count_chars

• fill_attribute

• sw_flags

• startf_flags

• stdin

• stdout

• stderr

Note that the ‘stdin’, ‘stdout’ and ‘stderr’ options can be either Ruby IO objects or file descriptors (i.e. a fileno). However, StringIO objects are not currently supported. Unfortunately, setting these is not currently an option for JRuby.

If ‘stdin’, ‘stdout’ or ‘stderr’ are specified, then the inherit value is automatically set to true and the Process::STARTF_USESTDHANDLES flag is automatically OR’d to the startf_flags value.

The ProcessInfo struct contains the following members:

• process_handle - The handle to the newly created process.

• thread_handle - The handle to the primary thread of the process.

• process_id - Process ID.

• thread_id - Thread ID.

If the ‘close_handles’ option is set to true (the default) then the process_handle and the thread_handle are automatically closed for you before the ProcessInfo struct is returned.

If the ‘with_logon’ option is set, then the process runs the specified executable file in the security context of the specified credentials.

# File 'lib/win32/process.rb', line 461

def create(args)
  unless args.kind_of?(Hash)
    raise TypeError, 'hash keyword arguments expected'
  end

  valid_keys = %w[
    app_name command_line inherit creation_flags cwd environment
    startup_info thread_inherit process_inherit close_handles with_logon
    domain password
  ]

  valid_si_keys = %w[
    startf_flags desktop title x y x_size y_size x_count_chars
    y_count_chars fill_attribute sw_flags stdin stdout stderr
  ]

  # Set default values
  hash = {
    'app_name'       => nil,
    'creation_flags' => 0,
    'close_handles'  => true
  }

  # Validate the keys, and convert symbols and case to lowercase strings.
  args.each{ |key, val|
    key = key.to_s.downcase
    unless valid_keys.include?(key)
      raise ArgumentError, "invalid key '#{key}'"
    end
    hash[key] = val
  }

  si_hash = {}

  # If the startup_info key is present, validate its subkeys
  if hash['startup_info']
    hash['startup_info'].each{ |key, val|
      key = key.to_s.downcase
      unless valid_si_keys.include?(key)
        raise ArgumentError, "invalid startup_info key '#{key}'"
      end
      si_hash[key] = val
    }
  end

  # The +command_line+ key is mandatory unless the +app_name+ key
  # is specified.
  unless hash['command_line']
    if hash['app_name']
      hash['command_line'] = hash['app_name']
      hash['app_name'] = nil
    else
      raise ArgumentError, 'command_line or app_name must be specified'
    end
  end

  env = nil

  # The env string should be passed as a string of ';' separated paths.
  if hash['environment']
    env = hash['environment']

    unless env.respond_to?(:join)
      env = hash['environment'].split(File::PATH_SEPARATOR)
    end

    env = env.map{ |e| e + 0.chr }.join('') + 0.chr
    env.to_wide_string! if hash['with_logon']
  end

  # Process SECURITY_ATTRIBUTE structure
  process_security = nil

  if hash['process_inherit']
    process_security = SECURITY_ATTRIBUTES.new
    process_security[:nLength] = 12
    process_security[:bInheritHandle] = true
  end

  # Thread SECURITY_ATTRIBUTE structure
  thread_security = nil

  if hash['thread_inherit']
    thread_security = SECURITY_ATTRIBUTES.new
    thread_security[:nLength] = 12
    thread_security[:bInheritHandle] = true
  end

  # Automatically handle stdin, stdout and stderr as either IO objects
  # or file descriptors. This won't work for StringIO, however. It also
  # will not work on JRuby because of the way it handles internal file
  # descriptors.
  #
  ['stdin', 'stdout', 'stderr'].each{ |io|
    if si_hash[io]
      if si_hash[io].respond_to?(:fileno)
        handle = get_osfhandle(si_hash[io].fileno)
      else
        handle = get_osfhandle(si_hash[io])
      end

      if handle == INVALID_HANDLE_VALUE
        ptr = FFI::MemoryPointer.new(:int)

        if windows_version >= 6 && get_errno(ptr) == 0
          errno = ptr.read_int
        else
          errno = FFI.errno
        end

        raise SystemCallError.new("get_osfhandle", errno)
      end

      # Most implementations of Ruby on Windows create inheritable
      # handles by default, but some do not. RF bug #26988.
      bool = SetHandleInformation(
        handle,
        HANDLE_FLAG_INHERIT,
        HANDLE_FLAG_INHERIT
      )

      raise SystemCallError.new("SetHandleInformation", FFI.errno) unless bool

      si_hash[io] = handle
      si_hash['startf_flags'] ||= 0
      si_hash['startf_flags'] |= STARTF_USESTDHANDLES
      hash['inherit'] = true
    end
  }

  procinfo  = PROCESS_INFORMATION.new
  startinfo = STARTUPINFO.new

  unless si_hash.empty?
    startinfo[:cb]              = startinfo.size
    startinfo[:lpDesktop]       = si_hash['desktop'] if si_hash['desktop']
    startinfo[:lpTitle]         = si_hash['title'] if si_hash['title']
    startinfo[:dwX]             = si_hash['x'] if si_hash['x']
    startinfo[:dwY]             = si_hash['y'] if si_hash['y']
    startinfo[:dwXSize]         = si_hash['x_size'] if si_hash['x_size']
    startinfo[:dwYSize]         = si_hash['y_size'] if si_hash['y_size']
    startinfo[:dwXCountChars]   = si_hash['x_count_chars'] if si_hash['x_count_chars']
    startinfo[:dwYCountChars]   = si_hash['y_count_chars'] if si_hash['y_count_chars']
    startinfo[:dwFillAttribute] = si_hash['fill_attribute'] if si_hash['fill_attribute']
    startinfo[:dwFlags]         = si_hash['startf_flags'] if si_hash['startf_flags']
    startinfo[:wShowWindow]     = si_hash['sw_flags'] if si_hash['sw_flags']
    startinfo[:cbReserved2]     = 0
    startinfo[:hStdInput]       = si_hash['stdin'] if si_hash['stdin']
    startinfo[:hStdOutput]      = si_hash['stdout'] if si_hash['stdout']
    startinfo[:hStdError]       = si_hash['stderr'] if si_hash['stderr']
  end

  app = nil
  cmd = nil

  # Convert strings to wide character strings if present
  if hash['app_name']
    app = hash['app_name'].to_wide_string
  end

  if hash['command_line']
    cmd = hash['command_line'].to_wide_string
  end

  if hash['cwd']
    cwd = hash['cwd'].to_wide_string
  end

  if hash['with_logon']
    logon = hash['with_logon'].to_wide_string

    if hash['password']
      passwd = hash['password'].to_wide_string
    else
      raise ArgumentError, 'password must be specified if with_logon is used'
    end

    if hash['domain']
      domain = hash['domain'].to_wide_string
    end

    hash['creation_flags'] |= CREATE_UNICODE_ENVIRONMENT

    bool = CreateProcessWithLogonW(
      logon,                  # User
      domain,                 # Domain
      passwd,                 # Password
      LOGON_WITH_PROFILE,     # Logon flags
      app,                    # App name
      cmd,                    # Command line
      hash['creation_flags'], # Creation flags
      env,                    # Environment
      cwd,                    # Working directory
      startinfo,              # Startup Info
      procinfo                # Process Info
    )

    unless bool
      raise SystemCallError.new("CreateProcessWithLogonW", FFI.errno)
    end
  else
    inherit  = hash['inherit'] || false

    bool = CreateProcessW(
      app,                    # App name
      cmd,                    # Command line
      process_security,       # Process attributes
      thread_security,        # Thread attributes
      inherit,                # Inherit handles?
      hash['creation_flags'], # Creation flags
      env,                    # Environment
      cwd,                    # Working directory
      startinfo,              # Startup Info
      procinfo                # Process Info
    )

    unless bool
      raise SystemCallError.new("CreateProcess", FFI.errno)
    end
  end

  # Automatically close the process and thread handles in the
  # PROCESS_INFORMATION struct unless explicitly told not to.
  if hash['close_handles']
    CloseHandle(procinfo[:hProcess])
    CloseHandle(procinfo[:hThread])
  end

  ProcessInfo.new(
    procinfo[:hProcess],
    procinfo[:hThread],
    procinfo[:dwProcessId],
    procinfo[:dwThreadId]
  )
end

.get_affinity(int = Process.pid) ⇒ Object

Returns the process and system affinity mask for the given pid, or the current process if no pid is provided. The return value is a two element array, with the first containing the process affinity mask, and the second containing the system affinity mask. Both are decimal values.

A process affinity mask is a bit vector indicating the processors that a process is allowed to run on. A system affinity mask is a bit vector in which each bit represents the processors that are configured into a system.

Example:

# System has 4 processors, current process is allowed to run on all
Process.get_affinity # => [[15], [15]], where '15' is 1 + 2 + 4 + 8

# System has 4 processors, current process only allowed on 1 and 4 only
Process.get_affinity # => [[9], [15]]

If you want to convert a decimal bit vector into an array of 0’s and 1’s indicating the flag value of each processor, you can use something like this approach:

mask = Process.get_affinity.first
(0..mask).to_a.map{ |n| mask[n] }

# File 'lib/win32/process.rb', line 52

def get_affinity(int = Process.pid)
  pmask = FFI::MemoryPointer.new(:ulong)
  smask = FFI::MemoryPointer.new(:ulong)

  if int == Process.pid
    unless GetProcessAffinityMask(GetCurrentProcess(), pmask, smask)
      raise SystemCallError, FFI.errno, "GetProcessAffinityMask"
    end
  else
    begin
      handle = OpenProcess(PROCESS_QUERY_INFORMATION, 0 , int)

      if handle == INVALID_HANDLE_VALUE
        raise SystemCallError, FFI.errno, "OpeProcess"
      end

      unless GetProcessAffinityMask(handle, pmask, smask)
        raise SystemCallError, FFI.errno, "GetProcessAffinityMask"
      end
    ensure
      CloseHandle(handle)
    end
  end

  [pmask.read_ulong, smask.read_ulong]
end

.getpriority(kind, int) ⇒ Object

Retrieves the priority class for the specified process id int. Unlike the default implementation, lower return values do not necessarily correspond to higher priority classes.

The kind parameter is ignored but required for API compatibility. You can only retrieve process information, not process group or user information, so it is effectively always Process::PRIO_PROCESS.

Possible return values are:

32 => Process::NORMAL_PRIORITY_CLASS 64 => Process::IDLE_PRIORITY_CLASS 128 => Process::HIGH_PRIORITY_CLASS 256 => Process::REALTIME_PRIORITY_CLASS 16384 => Process::BELOW_NORMAL_PRIORITY_CLASS 32768 => Process::ABOVE_NORMAL_PRIORITY_CLASS

Raises:

• (TypeError)

# File 'lib/win32/process.rb', line 98

def getpriority(kind, int)
  raise TypeError, kind unless kind.is_a?(Fixnum) # Match spec
  raise TypeError, int unless int.is_a?(Fixnum)   # Match spec
  int = Process.pid if int == 0                   # Match spec

  handle = OpenProcess(PROCESS_QUERY_INFORMATION, false, int)

  if handle == INVALID_HANDLE_VALUE
    raise SystemCallError, FFI.errno, "OpenProcess"
  end

  begin
    priority = GetPriorityClass(handle)

    if priority == 0
      raise SystemCallError, FFI.errno, "GetPriorityClass"
    end
  ensure
    CloseHandle(handle)
  end

  priority
end

.getrlimit(resource) ⇒ Object

Gets the resource limit of the current process. Only a limited number of flags are supported.

Process::RLIMIT_CPU Process::RLIMIT_FSIZE Process::RLIMIT_AS Process::RLIMIT_RSS Process::RLIMIT_VMEM

The Process:RLIMIT_AS, Process::RLIMIT_RSS and Process::VMEM constants all refer to the Process memory limit. The Process::RLIMIT_CPU constant refers to the per process user time limit. The Process::RLIMIT_FSIZE constant is hard coded to the maximum file size on an NTFS filesystem, approximately 4TB (or 4GB if not NTFS).

While a two element array is returned in order to comply with the spec, there is no separate hard and soft limit. The values will always be the same.

If [0,0] is returned then it means no limit has been set.

Example:

Process.getrlimit(Process::RLIMIT_VMEM) # => [0, 0]

– NOTE: Both the getrlimit and setrlimit method use an at_exit handler to close a job handle. This is necessary because simply calling it at the end of the block, while marking it for closure, would also make it unavailable within the same process again since it would no longer be associated with the job. In other words, trying to call it more than once within the same program would fail.

# File 'lib/win32/process.rb', line 246

def getrlimit(resource)
  if resource == RLIMIT_FSIZE
    if volume_type == 'NTFS'
      return ((1024**4) * 4) - (1024 * 64) # ~ 4TB
    else
      return (1024**3) * 4 # 4 GB
    end
  end

  handle = nil
  in_job = Process.job?

  # Put the current process in a job if it's not already in one
  if in_job && defined?(@win32_process_job_name)
    handle = OpenJobObjectA(JOB_OBJECT_QUERY, true, @win32_process_job_name)
    raise SystemCallError, FFI.errno, "OpenJobObject" if handle == 0
  else
    @win32_process_job_name = 'ruby_' + Process.pid.to_s
    handle = CreateJobObjectA(nil, @win32_process_job_name)
    raise SystemCallError, FFI.errno, "CreateJobObject" if handle == 0
  end

  begin
    unless in_job
      unless AssignProcessToJobObject(handle, GetCurrentProcess())
        raise Error, get_last_error
      end
    end

    ptr = JOBJECT_EXTENDED_LIMIT_INFORMATION.new
    val = nil

    # Set the LimitFlags member of the struct
    case resource
      when RLIMIT_CPU
        ptr[:BasicLimitInformation][:LimitFlags] = JOB_OBJECT_LIMIT_PROCESS_TIME
      when RLIMIT_AS, RLIMIT_VMEM, RLIMIT_RSS
        ptr[:BasicLimitInformation][:LimitFlags] = JOB_OBJECT_LIMIT_PROCESS_MEMORY
      else
        raise ArgumentError, "unsupported resource type: '#{resource}'"
    end

    bool = QueryInformationJobObject(
      handle,
      JobObjectExtendedLimitInformation,
      ptr,
      ptr.size,
      nil
    )

    unless bool
      raise SystemCallError, FFI.errno, "QueryInformationJobObject"
    end

    case resource
      when Process::RLIMIT_CPU
        val = ptr[:BasicLimitInformation][:PerProcessUserTimeLimit][:QuadPart]
      when RLIMIT_AS, RLIMIT_VMEM, RLIMIT_RSS
        val = ptr[:ProcessMemoryLimit]
    end

  ensure
    at_exit{ CloseHandle(handle) if handle }
  end

  [val, val]
end

.job? ⇒ Boolean

Returns whether or not the current process is part of a Job (process group).

Returns:

• (Boolean)

# File 'lib/win32/process.rb', line 21

def job?
  pbool = FFI::MemoryPointer.new(:int)
  IsProcessInJob(GetCurrentProcess(), nil, pbool)
  pbool.read_int == 1 ? true : false
end

.kill(signal, *pids) ⇒ Object

Kill a given process with a specific signal. This overrides the default implementation of Process.kill. The differences mainly reside in the way it kills processes, but this version also gives you finer control over behavior.

Internally, signals 2 and 3 will generate a console control event, using a ctrl-c or ctrl-break event, respectively. Signal 9 terminates the process harshly, given that process no chance to do any internal cleanup. Signals 1 and 4-8 kill the process more nicely, giving the process a chance to do internal cleanup before being killed. Signal 0 behaves the same as the default implementation.

When using signals 1 or 4-8 you may specify additional options that allow finer control over how that process is killed and how your program behaves.

Possible options for signals 1 and 4-8.

:exit_proc => The name of the exit function called when signal 1 or 4-8

is used. The default is 'ExitProcess'.

:dll_module => The name of the .dll (or .exe) that contains :exit_proc.

The default is 'kernel32'.

:wait_time => The time, in milliseconds, to wait for the process to

actually die. The default is 5ms. If you specify 0 here
then the process does not wait if the process is not
signaled and instead returns immediately. Alternatively,
you may specify Process::INFINITE, and your code will
block until the process is actually signaled.

Example:

Process.kill(1, 12345, :exit_proc => 'ExitProcess', :module => 'kernel32')

# File 'lib/win32/process.rb', line 734

def kill(signal, *pids)
  # Match the spec, require at least 2 arguments
  if pids.length == 0
    raise ArgumentError, "wrong number of arguments (1 for at least 2)"
  end

  # Match the spec, signal may not be less than zero if numeric
  if signal.is_a?(Numeric) && signal < 0 # EINVAL
    raise SystemCallError.new(22)
  end

  # Match the spec, signal must be a numeric, string or symbol
  unless signal.is_a?(String) || signal.is_a?(Numeric) || signal.is_a?(Symbol)
    raise ArgumentError, "bad signal type #{signal.class}"
  end

  # Match the spec, making an exception for BRK/SIGBRK, if the signal name is invalid
  if signal.is_a?(String) || signal.is_a?(Symbol)
    signal = signal.to_s.sub('SIG', '')
    unless Signal.list.keys.include?(signal) || ['BRK', 'BRK'].include?(signal)
      raise ArgumentError, "unsupported name '#{signal}'"
    end
  end

  # If the last argument is a hash, pop it and assume it's a hash of options
  if pids.last.is_a?(Hash)
    hash = pids.pop
    opts = {}

    valid = %w[exit_proc dll_module wait_time]

    hash.each{ |k,v|
      k = k.to_s.downcase
      unless valid.include?(k)
        raise ArgumentError, "invalid option '#{k}'"
      end
      opts[k] = v
    }

    exit_proc  = opts['exit_proc']  || 'ExitProcess'
    dll_module = opts['dll_module'] || 'kernel32'
    wait_time  = opts['wait_time']  || 5
  else
    wait_time  = 5
    exit_proc  = 'ExitProcess'
    dll_module = 'kernel32'
  end

  count = 0

  pids.each{ |pid|
    raise TypeError unless pid.is_a?(Numeric) # Match spec, pid must be a number
    raise SystemCallError.new(22) if pid < 0  # Match spec, EINVAL if pid less than zero

    sigint = [Signal.list['INT'], 'INT', 'SIGINT', :INT, :SIGINT, 2]

    # Match the spec
    if pid == 0 && !sigint.include?(signal)
      raise SystemCallError.new(22)
    end

    if signal == 0
      access = PROCESS_QUERY_INFORMATION | PROCESS_VM_READ
    elsif signal == 9
      access = PROCESS_TERMINATE
    else
      access = PROCESS_ALL_ACCESS
    end

    begin
      handle = OpenProcess(access, false, pid)

      if signal != 0 && handle == 0
        raise SystemCallError, FFI.errno, "OpenProcess"
      end

      case signal
        when 0
          if handle != 0
            count += 1
          else
            if FFI.errno == ERROR_ACCESS_DENIED
              count += 1
            else
              raise SystemCallError.new(3) # ESRCH
            end
          end
        when Signal.list['INT'], 'INT', 'SIGINT', :INT, :SIGINT, 2
          if GenerateConsoleCtrlEvent(CTRL_C_EVENT, pid)
            count += 1
          else
            raise SystemCallError.new("GenerateConsoleCtrlEvent", FFI.errno)
          end
        when Signal.list['BRK'], 'BRK', 'SIGBRK', :BRK, :SIGBRK, 3
          if GenerateConsoleCtrlEvent(CTRL_BREAK_EVENT, pid)
            count += 1
          else
            raise SystemCallError.new("GenerateConsoleCtrlEvent", FFI.errno)
          end
        when Signal.list['KILL'], 'KILL', 'SIGKILL', :KILL, :SIGKILL, 9
          if TerminateProcess(handle, pid)
            count += 1
          else
            raise SystemCallError.new("TerminateProcess", FFI.errno)
          end
        else
          thread_id = FFI::MemoryPointer.new(:ulong)

          mod = GetModuleHandle(dll_module)

          if mod == 0
            raise SystemCallError.new("GetModuleHandle: '#{dll_module}'", FFI.errno)
          end

          proc_addr = GetProcAddress(mod, exit_proc)

          if proc_addr == 0
            raise SystemCallError.new("GetProcAddress: '#{exit_proc}'", FFI.errno)
          end

          thread = CreateRemoteThread(handle, nil, 0, proc_addr, nil, 0, thread_id)

          if thread > 0
            WaitForSingleObject(thread, wait_time)
            count += 1
          else
            raise SystemCallError.new("CreateRemoteThread", FFI.errno)
          end
      end
    ensure
      CloseHandle(handle) if handle
    end
  }

  count
end

.setpriority(kind, int, int_priority) ⇒ Object

Sets the priority class for the specified process id int.

The kind parameter is ignored but present for API compatibility. You can only retrieve process information, not process group or user information, so it is effectively always Process::PRIO_PROCESS.

Possible int_priority values are:

• Process::NORMAL_PRIORITY_CLASS

• Process::IDLE_PRIORITY_CLASS

• Process::HIGH_PRIORITY_CLASS

• Process::REALTIME_PRIORITY_CLASS

• Process::BELOW_NORMAL_PRIORITY_CLASS

• Process::ABOVE_NORMAL_PRIORITY_CLASS

Raises:

• (TypeError)

# File 'lib/win32/process.rb', line 139

def setpriority(kind, int, int_priority)
  raise TypeError unless kind.is_a?(Integer)          # Match spec
  raise TypeError unless int.is_a?(Integer)           # Match spec
  raise TypeError unless int_priority.is_a?(Integer)  # Match spec
  int = Process.pid if int == 0                       # Match spec

  handle = OpenProcess(PROCESS_SET_INFORMATION, false , int)

  if handle == INVALID_HANDLE_VALUE
    raise SystemCallError, FFI.errno, "OpenProcess"
  end

  begin
    unless SetPriorityClass(handle, int_priority)
      raise SystemCallError, FFI.errno, "SetPriorityClass"
    end
  ensure
    CloseHandle(handle)
  end

  return 0 # Match the spec
end

.setrlimit(resource, current_limit, max_limit = nil) ⇒ Object

Sets the resource limit of the current process. Only a limited number of flags are supported.

Process::RLIMIT_CPU Process::RLIMIT_AS Process::RLIMIT_RSS Process::RLIMIT_VMEM

The Process:RLIMIT_AS, Process::RLIMIT_RSS and Process::VMEM constants all refer to the Process memory limit. The Process::RLIMIT_CPU constant refers to the per process user time limit.

The max_limit parameter is provided for interface compatibility only. It is always set to the current_limit value.

Example:

Process.setrlimit(Process::RLIMIT_VMEM, 1024 * 4) # => nil
Process.getrlimit(Process::RLIMIT_VMEM) # => [4096, 4096]

# File 'lib/win32/process.rb', line 336

def setrlimit(resource, current_limit, max_limit = nil)
  max_limit = current_limit

  handle = nil
  in_job = Process.job?

  unless [RLIMIT_AS, RLIMIT_VMEM, RLIMIT_RSS, RLIMIT_CPU].include?(resource)
    raise ArgumentError, "unsupported resource type: '#{resource}'"
  end

  # Put the current process in a job if it's not already in one
  if in_job && defined? @win32_process_job_name
    handle = OpenJobObjectA(JOB_OBJECT_SET_ATTRIBUTES, true, @win32_process_job_name)
    raise SystemCallError, FFI.errno, "OpenJobObject" if handle == 0
  else
    @job_name = 'ruby_' + Process.pid.to_s
    handle = CreateJobObjectA(nil, job_name)
    raise SystemCallError, FFI.errno, "CreateJobObject" if handle == 0
  end

  begin
    unless in_job
      unless AssignProcessToJobObject(handle, GetCurrentProcess())
        raise SystemCallError, FFI.errno, "AssignProcessToJobObject"
      end
    end

    ptr = JOBJECT_EXTENDED_LIMIT_INFORMATION.new

    # Set the LimitFlags and relevant members of the struct
    if resource == RLIMIT_CPU
      ptr[:BasicLimitInformation][:LimitFlags] = JOB_OBJECT_LIMIT_PROCESS_TIME
      ptr[:BasicLimitInformation][:PerProcessUserTimeLimit][:QuadPart] = max_limit
    else
      ptr[:BasicLimitInformation][:LimitFlags] = JOB_OBJECT_LIMIT_PROCESS_MEMORY
      ptr[:ProcessMemoryLimit] = max_limit
    end

    bool = SetInformationJobObject(
      handle,
      JobObjectExtendedLimitInformation,
      ptr,
      ptr.size
    )

    unless bool
      raise SystemCallError, FFI.errno, "SetInformationJobObject"
    end
  ensure
    at_exit{ CloseHandle(handle) if handle }
  end
end

.uid(sid = false) ⇒ Object

Returns the uid of the current process. Specifically, it returns the RID of the SID associated with the owner of the process.

If sid is set to true, then a binary sid is returned. Otherwise, a numeric id is returned (the default). – The Process.uid method in core Ruby always returns 0 on MS Windows.

Raises:

• (TypeError)

# File 'lib/win32/process.rb', line 172

def uid(sid = false)
  token = FFI::MemoryPointer.new(:ulong)

  raise TypeError unless sid.is_a?(TrueClass) || sid.is_a?(FalseClass)

  unless OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, token)
    raise SystemCallError, FFI.errno, "OpenProcessToken"
  end

  token   = token.read_ulong
  rlength = FFI::MemoryPointer.new(:ulong)
  tuser   = 0.chr * 512

  bool = GetTokenInformation(
    token,
    TokenUser,
    tuser,
    tuser.size,
    rlength
  )

  unless bool
    raise SystemCallError, FFI.errno, "GetTokenInformation"
  end

  string_sid = tuser[8, (rlength.read_ulong - 8)]

  if sid
    string_sid
  else
    psid = FFI::MemoryPointer.new(:ulong)

    unless ConvertSidToStringSidA(string_sid, psid)
      raise SystemCallError, FFI.errno, "ConvertSidToStringSid"
    end

    psid.read_pointer.read_string.split('-').last.to_i
  end
end