Kill doesn't work on Ubuntu about background_process

[timcharper]

That's really weird... especially since BackgroundProcess is specifically using 'exec' to execute the command... I don't know how much more 'exec-y' you can get.

I've tried it on an ubuntu karmic machine, and it appears to work fine:

irb(main):004:0> bp = BackgroundProcess.run("sleep 100")
=> #<BackgroundProcess:0x7ff34e8ba828 @stderr=#<IO:0x7ff34e8bada0>, @stdout=#<IO:0x7ff34e8bb1b0>, @stdin=#<IO:0x7ff34e8bb430>, @pid=22329>
irb(main):005:0> 
[1]+  Stopped                 irb
root@utility:~ $ ps aux -H | grep 'sleep 100' -A5 -B5
root      1678  0.0  0.0  18652   532 ?        Ss   Mar31   0:00   cron
root      1703  0.0  0.0  49004   356 ?        Ss   Mar31   0:03   /usr/sbin/sshd
root     22204  0.0  0.0  80920  3528 ?        Ss   05:34   0:00     sshd: root@pts/4 
root     22261  0.0  0.0  18408  2612 pts/4    Ss   05:35   0:00       -bash
root     22306  0.1  0.2  46524 11564 pts/4    T    05:36   0:00         irb                          
root     22329  0.0  0.0   8096   592 pts/4    T    05:37   0:00           sleep 100
root     22335  0.0  0.0  14952  1056 pts/4    R+   05:38   0:00         ps aux -H
root     22336  0.0  0.0   5992   644 pts/4    S+   05:38   0:00         grep sleep 100 -A5 -B5
root      1708  0.0  0.0   5916    64 tty1     Ss+  Mar31   0:00   /sbin/getty -8 38400 tty1
root      9451  0.0  0.0  36944   636 ?        Ss   Apr01   0:00   /usr/lib/postfix/master
postfix   9455  0.0  0.0  39164   912 ?        S    Apr01   0:00     qmgr -l -t fifo -u
postfix  22194  0.0  0.0  39004  2116 ?        S    05:28   0:00     pickup -l -t fifo -u
104      10408  0.0  0.0  23280   776 ?        Ss   Apr01   0:00   dbus-daemon --system --fork
root@utility:~ $ fg
irb
bp.pid
=> 22329
irb(main):006:0> 
[1]+  Stopped                 irb

root@utility:~ $ cat /etc/apt/sources.list
deb http://archive.ubuntu.com/ubuntu/ karmic main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ karmic main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ karmic-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ karmic-updates main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu karmic-security main restricted universe multiverse
deb-src http://security.ubuntu.com/ubuntu karmic-security main restricted universe multiverse

[timcharper]

which ruby version are you using? Is it the same between OS X and your Ubuntu machine?

[aishfenton]

We're using ruby 1.8.7 (patchlevel 174) on both.

We'll see if we can reproduce it with a simpler script and upload it (at the moment we're using BackgroundProcess from within a Cucumber script, but I don't think that this is causing the issue).

[timcharper]

are you using output redirectors?

irb(main):007:0*   bp = BackgroundProcess.run("sleep 100 > 1")
=> #<BackgroundProcess:0x7ff34e88fd08 @stderr=#<IO:0x7ff34e88fdf8>, @stdout=#<IO:0x7ff34e88fee8>, @stdin=#<IO:0x7ff34e88ff60>, @pid=22411>
irb(main):008:0> 
[1]+  Stopped                 irb
root@utility:~ $ ps aux -H | grep 'sleep 100' -A5 -B5
root     22204  0.0  0.0  80920  3528 ?        Ss   05:34   0:00     sshd: root@pts/4 
root     22261  0.0  0.0  18408  2624 pts/4    Ss   05:35   0:00       -bash
root     22306  0.0  0.2  46536 11568 pts/4    T    05:36   0:00         irb                          
root     22411  0.0  0.0   3928   564 pts/4    T    06:04   0:00           sh -c sleep 100 > 1
root     22412  0.0  0.0   8092   588 pts/4    T    06:04   0:00             sleep 100
root     22418  0.0  0.0  14948  1052 pts/4    R+   06:04   0:00         ps aux -H
root     22419  0.0  0.0   6000   648 pts/4    S+   06:04   0:00         grep sleep 100 -A5 -B5
root      1708  0.0  0.0   5916    64 tty1     Ss+  Mar31   0:00   /sbin/getty -8 38400 tty1
root      9451  0.0  0.0  36944   636 ?        Ss   Apr01   0:00   /usr/lib/postfix/master
postfix   9455  0.0  0.0  39164   912 ?        S    Apr01   0:00     qmgr -l -t fifo -u
postfix  22194  0.0  0.0  39004  2180 ?        S    05:28   0:00     pickup -l -t fifo -u
104      10408  0.0  0.0  23280   776 ?        Ss   Apr01   0:00   dbus-daemon --system --fork

[aishfenton]

No, but we're explicitly running ruby (maybe with relative paths), which might?

ruby -rubygems bin/my_script args

When you

[aishfenton]

When it uses the "sh -c ... " version. Does kill work for you?

[aishfenton]

Just tried running this on OS X. It actually causes an orphan process to be left behind too.
So probably nothing to do with Ubuntu.

require 'rubygems'
require 'background_process'

bp = BackgroundProcess.run("sleep 100 > 1")

sleep(2)

bp.kill
bp.wait

[timcharper]

I don't believe it would.

I'm curious to see if that's what's reproducing it. Can you record a screencast with jing or something and share it to demonstrate the problem? Or terminal output?