Re: [CentOS] bash job control and signals
On 08/29/2012 11:57 PM, Stephen Harris wrote: On Wed, Aug 29, 2012 at 10:00:47PM +0200, Theo Band wrote: and I cannot change this application. I want all processes that are children also to become suspended. I tried to add a trap, but that did not work. Any idea how to make this work? The magic phrase you're looking for is process group. When you press control-Z a signal is sent to all the process in the process group, but when you send a kill it's only sent to one process. So % ps -o pgrp $your_process That'll tell you the process group.Then you kill -STOP -pgrp (note the negative ID sent to kill) That'll send a signal to all processes in the group Thanks Stephen That's exactly what my application does wrong. I will ask the vendor to change the way they signal the external script. It's basically only adding a dash before the signal and it works! ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] bash job control and signals
I want to suspend a script using a signal but that does not work as I want. I made an example script: $ cat script #!/bin/bash echo $$ gkrellm If run this script gkrellm starts up and I can use job control from the terminal to suspend the script (CTRL-Z) and resume it (fg or bg). If I suspend I can see that gkrellm freezes (that's why I choose gkrellm in this example): $ ./script 23632 --CTRL-Z-- [3]+ Stopped ./script $ fg ./script Next I want to do exactly the same but from another terminal using a signal: kill -SIGSTOP 23632 [3]+ Stopped ./script So the bash script is indeed suspended, but the gkrellm keeps running. I can of course signal SIGSTOP to gkrellm and then this gkrellm will suspend as well. I have however an application that suspends my script and I cannot change this application. I want all processes that are children also to become suspended. I tried to add a trap, but that did not work. Any idea how to make this work? Theo ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] bash job control and signals
On Wed, Aug 29, 2012 at 10:00:47PM +0200, Theo Band wrote: and I cannot change this application. I want all processes that are children also to become suspended. I tried to add a trap, but that did not work. Any idea how to make this work? The magic phrase you're looking for is process group. When you press control-Z a signal is sent to all the process in the process group, but when you send a kill it's only sent to one process. So % ps -o pgrp $your_process That'll tell you the process group.Then you kill -STOP -pgrp (note the negative ID sent to kill) That'll send a signal to all processes in the group -- rgds Stephen ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
