[jira] [Assigned] (MESOS-8155) subprocess clone argument should return a Try

["James Peach (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MESOS-8155?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

James Peach reassigned MESOS-8155:
----------------------------------

    Assignee: James Peach

> subprocess clone argument should return a Try<pid_t>
> ----------------------------------------------------
>
>                 Key: MESOS-8155
>                 URL: https://issues.apache.org/jira/browse/MESOS-8155
>             Project: Mesos
>          Issue Type: Bug
>          Components: libprocess
>            Reporter: James Peach
>            Assignee: James Peach
>
> In libprocess, the {{subprocess}} API accepts a {{clone}} argument. This is supposed to return a {{pid_t}} and set {{errno}} on error. However. Mesos sometimes passes {{ns::clone}} as the {{clone}} argument, and this API does not set {{errno}} which results in {{subprocess}} propagating a misleading error message up the stack.
> Since it is not at all obvious how to map all the {{ns::clone}} error conditions to an expressive {{errno}}, we should just change the clone argument to return a {{Try<pid_t>}}.



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