Module: Zerg::Support::Process::Helpers

Defined in:
lib/zerg_support/spawn.rb

Overview

Helpers for spawning processes.

Class Method Summary collapse

Class Method Details

.close_fds(options) ⇒ Object

Closes all open file descriptors except for stdin/stdout/stderr



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# File 'lib/zerg_support/spawn.rb', line 114

def self.close_fds(options)
  return if options[:close_others] == false
  
  ObjectSpace.each_object(IO) do |io|
    next if [STDIN, STDOUT, STDERR].include? io
    
    begin
      io.close unless io.closed?
    rescue Exception
    end
  end
end

.do_redirects(options) ⇒ Object

Performs IO redirections according to the given options. The options follow the convention of Kernel.spawn in ruby1.9



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# File 'lib/zerg_support/spawn.rb', line 167

def self.do_redirects(options)
  redirected_files = {}
  file_redirects = []
  fd_redirects = []
  options.each do |key, value|
    next unless key.kind_of? IO
    if value.kind_of? String
      if redirected_files[value]
        fd_redirects << [key, redirected_files[value]]
      else
        file_redirects << [key, value]
        redirected_files[value] = key
      end
    else
      fd_redirects << [key, value]
    end
  end
  (file_redirects + fd_redirects).each do |r|
    r.first.reopen r.last
  end
end

.set_environment(options) ⇒ Object

Sets the process’ environment according to the given options. The options follow the convention of Kernel.spawn in ruby1.9



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# File 'lib/zerg_support/spawn.rb', line 156

def self.set_environment(options)
  return unless options[:env]
  
  ENV.clear if options[:unsetenv_others]
  options[:env].each do |key, value|
    ENV[key] = value
  end
end

.set_process_group(options) ⇒ Object

Sets the process’ group according to the given options. The options follow the convention of Kernel.spawn in ruby1.9



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# File 'lib/zerg_support/spawn.rb', line 144

def self.set_process_group(options)
  return unless options[:pgroup]
  
  if options[:pgroup].kind_of? Numeric and options[:pgroup] > 0
    Process.setpgid 0, options[:pgroup]
  else
    Process.setsid
  end
end

.set_rlimits(options) ⇒ Object

Sets process limits (rlimits) according to the given options. The options follow the convention of Kernel.spawn in ruby1.9



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# File 'lib/zerg_support/spawn.rb', line 129

def self.set_rlimits(options)
  # rlimit options
  options.each do |k, v|
    next unless k.kind_of? Symbol and k.to_s[0, 7] == 'rlimit_'
    rconst = Process.const_get k.to_s.upcase.to_sym
    if v.kind_of? Enumerable
      Process.setrlimit rconst, v.first, v.last
    else
      Process.setrlimit rconst, v
    end              
  end    
end