IO.popen doesn't wait until a process ends but returns immediately
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Key: JRUBY-6162
URL: https://jira.codehaus.org/browse/JRUBY-6162
Project: JRuby
Issue Type: Bug
Components: Miscellaneous
Affects Versions: JRuby 1.6.4, JRuby 1.6.5
Environment: I reproduced this on Ubuntu 11.10 and on an older CentOS
5.6 with JRuby 1.6.3 and JRuby 1.6.5
Reporter: Heiko Seebach
Hi,
I hope that I'm wrong, but at the moment this looks like a serious bug to me,
but maybe I just didn't do enough RTFM. I found this bug when using
ActionMailer with sendmail. The "/usr/sbin/sendmail" process was only sometimes
called and sometimes it wasn't (most often it wasn't but around every tenth
time it suddenly worked)
I investigated it deeply and after hours I distilled it down to the following:
hk@hk:~$ rvm use jruby ruby -e "cmd='/bin/bash -c \"sleep 5\"'; puts Time.now ;
system(cmd); puts Time.now; IO.popen(cmd) {} ; puts Time.now "
Wed Oct 26 16:37:08 +0200 2011
Wed Oct 26 16:37:13 +0200 2011
Wed Oct 26 16:37:13 +0200 2011
hk@hk:~$ rvm use 1.8.7 ruby -e "cmd='/bin/bash -c \"sleep 5\"'; puts Time.now ;
system(cmd); puts Time.now; IO.popen(cmd) {} ; puts Time.now "
Wed Oct 26 16:37:18 +0200 2011
Wed Oct 26 16:37:23 +0200 2011
Wed Oct 26 16:37:28 +0200 2011
hk@hk:~$
As one can see, the system call on both Ruby Interpreters waits until the
subprocess exits. But with MRI it also stops when using IO.popen, but not with
JRuby. Here it returns immediately.
I found a very ugly workaround for the moment by doing something like the
following:
module ActionMailer
class Base
def perform_delivery_sendmail(mail)
sendmail_args = sendmail_settings[:arguments]
sendmail_args += " -f \"#{mail['return-path']}\"" if mail['return-path']
IO.popen("#{sendmail_settings[:location]} #{sendmail_args}", "r+") do |f|
#r+ geht, w+ geht nicht richtig, bzw. nur manchmal
f.puts mail.encoded.gsub(/\r/, '')
f.close_write
sleep 1 # <---- added this line in order to give sendmail some time to
process
end
end
end
end
Here are some environment infos:
hk@hk:~$ rvm info jruby
jruby-1.6.5:
system:
uname: "Linux hk 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25
UTC 2011 x86_64 x86_64 x86_64 GNU/Linux"
bash: "/bin/bash => GNU bash, Version 4.2.10(1)-release
(x86_64-pc-linux-gnu)"
zsh: " => not installed"
rvm:
version: "rvm 1.9.0 by Wayne E. Seguin ([email protected])
[https://rvm.beginrescueend.com/]";
ruby:
interpreter: "jruby"
version: "1.6.5"
date: "2011-10-25"
platform: "linux-amd64-java"
patchlevel: "OpenJDK 64-Bit Server VM 1.6.0_23"
full_version: "jruby 1.6.5 (ruby-1.8.7-p330) (2011-10-25 9dcd388) (OpenJDK
64-Bit Server VM 1.6.0_23) [linux-amd64-java]"
homes:
gem: "/home/hk/.rvm/gems/jruby-1.6.5"
ruby: "/home/hk/.rvm/rubies/jruby-1.6.5"
binaries:
ruby: "/home/hk/.rvm/rubies/jruby-1.6.5/bin/ruby"
irb: "/home/hk/.rvm/rubies/jruby-1.6.5/bin/irb"
gem: "/home/hk/.rvm/rubies/jruby-1.6.5/bin/gem"
rake: "/home/hk/.rvm/gems/jruby-1.6.5/bin/rake"
environment:
PATH:
"/home/hk/.rvm/gems/jruby-1.6.5/bin:/home/hk/.rvm/gems/jruby-1.6.5@global/bin:/home/hk/.rvm/rubies/jruby-1.6.5/bin:/home/hk/.rvm/bin:<other
stuff>"
GEM_HOME: "/home/hk/.rvm/gems/jruby-1.6.5"
GEM_PATH:
"/home/hk/.rvm/gems/jruby-1.6.5:/home/hk/.rvm/gems/jruby-1.6.5@global"
MY_RUBY_HOME: "/home/hk/.rvm/rubies/jruby-1.6.5"
IRBRC: "/home/hk/.rvm/rubies/jruby-1.6.5/.irbrc"
RUBYOPT: ""
gemset: ""
hk@hk:~$
hk@hk:~$ rvm info 1.8.7
ruby-1.8.7-p352:
system:
uname: "Linux hk 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25
UTC 2011 x86_64 x86_64 x86_64 GNU/Linux"
bash: "/bin/bash => GNU bash, Version 4.2.10(1)-release
(x86_64-pc-linux-gnu)"
zsh: " => not installed"
rvm:
version: "rvm 1.9.0 by Wayne E. Seguin ([email protected])
[https://rvm.beginrescueend.com/]";
ruby:
interpreter: "ruby"
version: "1.8.7"
date: "2011-06-30"
platform: "x86_64-linux"
patchlevel: "2011-06-30 patchlevel 352"
full_version: "ruby 1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]"
homes:
gem: "/home/hk/.rvm/gems/ruby-1.8.7-p352"
ruby: "/home/hk/.rvm/rubies/ruby-1.8.7-p352"
binaries:
ruby: "/home/hk/.rvm/rubies/ruby-1.8.7-p352/bin/ruby"
irb: "/home/hk/.rvm/rubies/ruby-1.8.7-p352/bin/irb"
gem: "/home/hk/.rvm/rubies/ruby-1.8.7-p352/bin/gem"
rake: "/home/hk/.rvm/gems/ruby-1.8.7-p352/bin/rake"
environment:
PATH:
"/home/hk/.rvm/gems/ruby-1.8.7-p352/bin:/home/hk/.rvm/gems/ruby-1.8.7-p352@global/bin:/home/hk/.rvm/rubies/ruby-1.8.7-p352/bin:<other
stuff>"
GEM_HOME: "/home/hk/.rvm/gems/ruby-1.8.7-p352"
GEM_PATH:
"/home/hk/.rvm/gems/ruby-1.8.7-p352:/home/hk/.rvm/gems/ruby-1.8.7-p352@global"
MY_RUBY_HOME: "/home/hk/.rvm/rubies/ruby-1.8.7-p352"
IRBRC: "/home/hk/.rvm/rubies/ruby-1.8.7-p352/.irbrc"
RUBYOPT: ""
gemset: ""
hk@hk:~$
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