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

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

James Peach created MESOS-8155:
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             Summary: subprocess clone argument should return a Try<pid_r>
                 Key: MESOS-8155
                 URL: https://issues.apache.org/jira/browse/MESOS-8155
             Project: Mesos
          Issue Type: Bug
          Components: libprocess
            Reporter: 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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