Date:        Wed, 10 May 2017 14:35:28 +0200
    From:        Vincent Lefevre <vincent-o...@vinc17.net>
    Message-ID:  <20170510123528.gc25...@cventin.lip.ens-lyon.fr>

  | Well, in any case, I meant that for
  | 
  |   `/path/to/external/command`
  | 
  | the SIGCHLD can either be due to the subshell or the external command

It is due to the subshell (if one is created, which it would be in that case.)
If the subshell decides to terminate itself by exec'ing some other process,
that's its business, but as far as the parent shell is concerned, it is the
subshell that has exited.

kre


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