/usr/lib/ruby/vendor_ruby/open4.rb is in ruby-open4 1.3.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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require 'fcntl'
require 'timeout'
require 'thread'
module Open4
VERSION = '1.3.4'
def Open4.version() VERSION end
def Open4.description
'open child process with handles on pid, stdin, stdout, and stderr: manage child processes and their io handles easily.'
end
class Error < ::StandardError; end
def pfork4(fun, &b)
Open4.do_popen(b, :block) do |ps_read, _|
ps_read.close
begin
fun.call
rescue SystemExit => e
# Make it seem to the caller that calling Kernel#exit in +fun+ kills
# the child process normally. Kernel#exit! bypasses this rescue
# block.
exit! e.status
else
exit! 0
end
end
end
module_function :pfork4
def popen4(*cmd, &b)
Open4.do_popen(b, :init) do |ps_read, ps_write|
ps_read.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
ps_write.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
exec(*cmd)
raise 'forty-two' # Is this really needed?
end
end
alias open4 popen4
module_function :popen4
module_function :open4
def popen4ext(closefds=false, *cmd, &b)
Open4.do_popen(b, :init, closefds) do |ps_read, ps_write|
ps_read.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
ps_write.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
exec(*cmd)
raise 'forty-two' # Is this really needed?
end
end
module_function :popen4ext
def self.do_popen(b = nil, exception_propagation_at = nil, closefds=false, &cmd)
pw, pr, pe, ps = IO.pipe, IO.pipe, IO.pipe, IO.pipe
verbose = $VERBOSE
begin
$VERBOSE = nil
cid = fork {
if closefds
exlist = [0, 1, 2] | [pw,pr,pe,ps].map{|p| [p.first.fileno, p.last.fileno] }.flatten
ObjectSpace.each_object(IO){|io|
io.close if (not io.closed?) and (not exlist.include? io.fileno) rescue nil
}
end
pw.last.close
STDIN.reopen pw.first
pw.first.close
pr.first.close
STDOUT.reopen pr.last
pr.last.close
pe.first.close
STDERR.reopen pe.last
pe.last.close
STDOUT.sync = STDERR.sync = true
begin
cmd.call(ps)
rescue Exception => e
Marshal.dump(e, ps.last)
ps.last.flush
ensure
ps.last.close unless ps.last.closed?
end
exit!
}
ensure
$VERBOSE = verbose
end
[ pw.first, pr.last, pe.last, ps.last ].each { |fd| fd.close }
Open4.propagate_exception cid, ps.first if exception_propagation_at == :init
pw.last.sync = true
pi = [ pw.last, pr.first, pe.first ]
begin
return [cid, *pi] unless b
begin
b.call(cid, *pi)
ensure
pi.each { |fd| fd.close unless fd.closed? }
end
Open4.propagate_exception cid, ps.first if exception_propagation_at == :block
Process.waitpid2(cid).last
ensure
ps.first.close unless ps.first.closed?
end
end
def self.propagate_exception(cid, ps_read)
e = Marshal.load ps_read
raise Exception === e ? e : "unknown failure!"
rescue EOFError
# Child process did not raise exception.
rescue
# Child process raised exception; wait it in order to avoid a zombie.
Process.waitpid2 cid
raise
ensure
ps_read.close
end
class SpawnError < Error
attr 'cmd'
attr 'status'
attr 'signals'
def exitstatus
@status.exitstatus
end
def initialize cmd, status
@cmd, @status = cmd, status
@signals = {}
if status.signaled?
@signals['termsig'] = status.termsig
@signals['stopsig'] = status.stopsig
end
sigs = @signals.map{|k,v| "#{ k }:#{ v.inspect }"}.join(' ')
super "cmd <#{ cmd }> failed with status <#{ exitstatus.inspect }> signals <#{ sigs }>"
end
end
class ThreadEnsemble
attr 'threads'
def initialize cid
@cid, @threads, @argv, @done, @running = cid, [], [], Queue.new, false
@killed = false
end
def add_thread *a, &b
@running ? raise : (@argv << [a, b])
end
#
# take down process more nicely
#
def killall
c = Thread.critical
return nil if @killed
Thread.critical = true
(@threads - [Thread.current]).each{|t| t.kill rescue nil}
@killed = true
ensure
Thread.critical = c
end
def run
@running = true
begin
@argv.each do |a, b|
@threads << Thread.new(*a) do |*_a|
begin
b[*_a]
ensure
killall rescue nil if $!
@done.push Thread.current
end
end
end
rescue
killall
raise
ensure
all_done
end
@threads.map{|t| t.value}
end
def all_done
@threads.size.times{ @done.pop }
end
end
def to timeout = nil
Timeout.timeout(timeout){ yield }
end
module_function :to
def new_thread *a, &b
cur = Thread.current
Thread.new(*a) do |*_a|
begin
b[*_a]
rescue Exception => e
cur.raise e
end
end
end
module_function :new_thread
def getopts opts = {}
lambda do |*args|
keys, default, _ = args
catch(:opt) do
[keys].flatten.each do |key|
[key, key.to_s, key.to_s.intern].each do |_key|
throw :opt, opts[_key] if opts.has_key?(_key)
end
end
default
end
end
end
module_function :getopts
def relay src, dst = nil, t = nil
send_dst =
if dst.respond_to?(:call)
lambda{|buf| dst.call(buf)}
elsif dst.respond_to?(:<<)
lambda{|buf| dst << buf }
else
lambda{|buf| buf }
end
unless src.nil?
if src.respond_to? :gets
while buf = to(t){ src.gets }
send_dst[buf]
end
elsif src.respond_to? :each
q = Queue.new
th = nil
timer_set = lambda do |_t|
th = new_thread{ to(_t){ q.pop } }
end
timer_cancel = lambda do |_t|
th.kill if th rescue nil
end
timer_set[t]
begin
src.each do |_buf|
timer_cancel[t]
send_dst[_buf]
timer_set[t]
end
ensure
timer_cancel[t]
end
elsif src.respond_to? :read
buf = to(t){ src.read }
send_dst[buf]
else
buf = to(t){ src.to_s }
send_dst[buf]
end
end
end
module_function :relay
def spawn arg, *argv
argv.unshift(arg)
opts = ((argv.size > 1 and Hash === argv.last) ? argv.pop : {})
argv.flatten!
cmd = argv.join(' ')
getopt = getopts opts
ignore_exit_failure = getopt[ 'ignore_exit_failure', getopt['quiet', false] ]
ignore_exec_failure = getopt[ 'ignore_exec_failure', !getopt['raise', true] ]
exitstatus = getopt[ %w( exitstatus exit_status status ) ]
stdin = getopt[ %w( stdin in i 0 ) << 0 ]
stdout = getopt[ %w( stdout out o 1 ) << 1 ]
stderr = getopt[ %w( stderr err e 2 ) << 2 ]
pid = getopt[ 'pid' ]
timeout = getopt[ %w( timeout spawn_timeout ) ]
stdin_timeout = getopt[ %w( stdin_timeout ) ]
stdout_timeout = getopt[ %w( stdout_timeout io_timeout ) ]
stderr_timeout = getopt[ %w( stderr_timeout ) ]
status = getopt[ %w( status ) ]
cwd = getopt[ %w( cwd dir ) ]
closefds = getopt[ %w( close_fds ) ]
exitstatus =
case exitstatus
when TrueClass, FalseClass
ignore_exit_failure = true if exitstatus
[0]
else
[*(exitstatus || 0)].map{|i| Integer i}
end
stdin ||= '' if stdin_timeout
stdout ||= '' if stdout_timeout
stderr ||= '' if stderr_timeout
started = false
status =
begin
chdir(cwd) do
Timeout::timeout(timeout) do
popen4ext(closefds, *argv) do |c, i, o, e|
started = true
%w( replace pid= << push update ).each do |msg|
break(pid.send(msg, c)) if pid.respond_to? msg
end
te = ThreadEnsemble.new c
te.add_thread(i, stdin) do |_i, _stdin|
relay _stdin, _i, stdin_timeout
_i.close rescue nil
end
te.add_thread(o, stdout) do |_o, _stdout|
relay _o, _stdout, stdout_timeout
end
te.add_thread(e, stderr) do |_o, _stderr| # HACK: I think this is a bug
relay e, _stderr, stderr_timeout
end
te.run
end
end
end
rescue
raise unless(not started and ignore_exec_failure)
end
raise SpawnError.new(cmd, status) unless
(ignore_exit_failure or (status.nil? and ignore_exec_failure) or exitstatus.include?(status.exitstatus))
status
end
module_function :spawn
def chdir cwd, &block
return(block.call Dir.pwd) unless cwd
Dir.chdir cwd, &block
end
module_function :chdir
def background arg, *argv
require 'thread'
q = Queue.new
opts = { 'pid' => q, :pid => q }
case argv.last
when Hash
argv.last.update opts
else
argv.push opts
end
thread = Thread.new(arg, argv){|_arg, _argv| spawn _arg, *_argv}
sc = class << thread; self; end
sc.module_eval {
define_method(:pid){ @pid ||= q.pop }
define_method(:spawn_status){ @spawn_status ||= value }
define_method(:exitstatus){ @exitstatus ||= spawn_status.exitstatus }
}
thread
end
alias bg background
module_function :background
module_function :bg
def maim pid, opts = {}
getopt = getopts opts
sigs = getopt[ 'signals', %w(SIGTERM SIGQUIT SIGKILL) ]
suspend = getopt[ 'suspend', 4 ]
pid = Integer pid
existed = false
sigs.each do |sig|
begin
Process.kill sig, pid
existed = true
rescue Errno::ESRCH
return(existed ? nil : true)
end
return true unless alive? pid
sleep suspend
return true unless alive? pid
end
return(not alive?(pid))
end
module_function :maim
def alive pid
pid = Integer pid
begin
Process.kill 0, pid
true
rescue Errno::ESRCH
false
end
end
alias alive? alive
module_function :alive
module_function :'alive?'
end
def open4(*cmd, &b) cmd.size == 0 ? Open4 : Open4::popen4(*cmd, &b) end
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