/
childprocess.rb
174 lines (148 loc) · 3.95 KB
/
childprocess.rb
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require 'childprocess/errors'
require 'childprocess/abstract_process'
require 'childprocess/abstract_io'
require "fcntl"
module ChildProcess
autoload :Unix, 'childprocess/unix'
autoload :Windows, 'childprocess/windows'
autoload :JRuby, 'childprocess/jruby'
@posix_spawn = false
class << self
def new(*args)
case os
when :macosx, :linux, :solaris, :bsd, :cygwin
if posix_spawn?
Unix::PosixSpawnProcess.new(args)
elsif jruby?
JRuby::Process.new(args)
else
Unix::ForkExecProcess.new(args)
end
when :windows
Windows::Process.new(args)
else
raise Error, "unsupported platform #{platform_name.inspect}"
end
end
alias_method :build, :new
def platform
if RUBY_PLATFORM == "java"
:jruby
elsif defined?(RUBY_ENGINE) && RUBY_ENGINE == "ironruby"
:ironruby
else
os
end
end
def platform_name
@platform_name ||= "#{arch}-#{os}"
end
def unix?
!windows?
end
def linux?
os == :linux
end
def jruby?
platform == :jruby
end
def windows?
os == :windows
end
def posix_spawn?
enabled = @posix_spawn || %w[1 true].include?(ENV['CHILDPROCESS_POSIX_SPAWN'])
return false unless enabled
require 'ffi'
begin
require "childprocess/unix/platform/#{ChildProcess.platform_name}"
rescue LoadError
raise ChildProcess::MissingPlatformError
end
require "childprocess/unix/lib"
require 'childprocess/unix/posix_spawn_process'
true
rescue ChildProcess::MissingPlatformError => ex
warn_once ex.message
false
end
#
# Set this to true to enable experimental use of posix_spawn.
#
def posix_spawn=(bool)
@posix_spawn = bool
end
def os
@os ||= (
require "rbconfig"
host_os = RbConfig::CONFIG['host_os'].downcase
case host_os
when /linux/
:linux
when /darwin|mac os/
:macosx
when /mswin|msys|mingw32/
:windows
when /cygwin/
:cygwin
when /solaris|sunos/
:solaris
when /bsd/
:bsd
else
raise Error, "unknown os: #{host_os.inspect}"
end
)
end
def arch
@arch ||= (
host_cpu = RbConfig::CONFIG['host_cpu'].downcase
case host_cpu
when /i[3456]86/
# Darwin always reports i686, even when running in 64bit mod
if os == :macosx && 0xfee1deadbeef.is_a?(Fixnum)
"x86_64"
else
"i386"
end
when /amd64|x86_64/
"x86_64"
when /ppc|powerpc/
"powerpc"
else
host_cpu
end
)
end
#
# By default, a child process will inherit open file descriptors from the
# parent process. This helper provides a cross-platform way of making sure
# that doesn't happen for the given file/io.
#
def close_on_exec(file)
if file.respond_to?(:close_on_exec=)
file.close_on_exec = true
elsif file.respond_to?(:fcntl) && defined?(Fcntl::FD_CLOEXEC)
file.fcntl Fcntl::F_SETFD, Fcntl::FD_CLOEXEC
if jruby? && posix_spawn?
# on JRuby, the fcntl call above apparently isn't enough when
# we're launching the process through posix_spawn.
fileno = JRuby.posix_fileno_for(file)
Unix::Lib.fcntl fileno, Fcntl::F_SETFD, Fcntl::FD_CLOEXEC
end
elsif windows?
Windows::Lib.dont_inherit file
else
raise Error, "not sure how to set close-on-exec for #{file.inspect} on #{platform_name.inspect}"
end
end
private
def warn_once(msg)
@warnings ||= {}
unless @warnings[msg]
@warnings[msg] = true
$stderr.puts msg
end
end
end # class << self
end # ChildProcess
require 'jruby' if ChildProcess.jruby?