[slurm-users] How to trap a SIGINT signal in a child process of a batch ?

Bjørn-Helge Mevik b.h.mevik at usit.uio.no
Tue Apr 21 08:29:32 UTC 2020

Jean-mathieu CHANTREIN <jean-mathieu.chantrein at univ-angers.fr> writes:

> test.sh: 
> #!/bin/bash 
> function sig_handler() 
> { 
> echo "Executable interrupted" 
> exit 2 
> } 
> trap 'sig_handler' SIGINT 
> echo "BEGIN" 
> sleep 200 
> echo "END"

Note that bash does not interrupt any running command (except "wait")
when it receives a trapped signal, so the "sleep 200" will not be
interrupted.  The "wait" command is special; it will be interrupted.
From man bash:

       If  bash is waiting for a command to complete and receives a signal for which a
       trap has been set, the trap will not be executed until the  command  completes.
       When  bash  is  waiting  for  an asynchronous command via the wait builtin, the
       reception of a signal for which a trap has been set will cause the wait builtin
       to  return  immediately with an exit status greater than 128, immediately after
       which the trap is executed.

So try using

sleep 200 &


Bjørn-Helge Mevik, dr. scient,
Department for Research Computing, University of Oslo
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