Re: Review Request 54952: Made `getpwnam_r` error handling more robust.

[Mesos ReviewBot <re...@mesos.apache.org>]

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Patch looks great!

Reviews applied: [54952]

Passed command: export OS='ubuntu:14.04' BUILDTOOL='autotools' COMPILER='gcc' CONFIGURATION='--verbose' ENVIRONMENT='GLOG_v=1 MESOS_VERBOSE=1'; ./support/docker_build.sh

- Mesos ReviewBot


On Dec. 28, 2016, 9:50 p.m., Neil Conway wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/54952/
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> 
> (Updated Dec. 28, 2016, 9:50 p.m.)
> 
> 
> Review request for mesos and Alexander Rukletsov.
> 
> 
> Bugs: MESOS-6826
>     https://issues.apache.org/jira/browse/MESOS-6826
> 
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> Repository: mesos
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> Description
> -------
> 
> According to POSIX, `getpwnam_r` returns 0 (and sets `result` to the
> null pointer) when the specified user name is not found. However,
> certain versions of Linux (e.g., RHEL7, recent Arch Linux) return
> non-zero and set `errno` (to one of several different values) when
> `getpwnam_r` is passed an invalid user name.
> 
> In stout, we want to treat the "invalid user name" and "user name not
> found" cases the same. Both the POSIX spec and Linux manpages call out
> certain errno values as definitely indicating errors (e.g., EIO,
> EMFILE). Hence, we check `errno` and return an error to the caller if
> `errno` appears in that list. We treat `errno` values not in that list
> as equivalent to "user not found".
> 
> 
> Diffs
> -----
> 
>   3rdparty/stout/include/stout/os/posix/su.hpp f3f45ebf006f0f8e7e70b0f4c4ed76465530c58e 
>   3rdparty/stout/tests/os_tests.cpp 8d2005b1f109b4025aa8368600763db9c829d0c5 
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> Diff: https://reviews.apache.org/r/54952/diff/
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> Testing
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> `make check` on Arch Linux. `OsTest.User` fails without this patch but succeeds with this patch.
> 
> 
> Thanks,
> 
> Neil Conway
> 
>