[riot-notifications] [RIOT-OS/RIOT] posix_sockets: set read/write permissions for socket fd (#11576)

Martine Lenders notifications at github.com
Fri May 24 16:13:20 CEST 2019

The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
you to make sure that your modifications are compliant with the RIOT
coding conventions, see https://github.com/RIOT-OS/RIOT/wiki/Coding-conventions.

### Contribution description
In https://github.com/RIOT-OS/RIOT/issues/11212 it was discovered, that the permissions for the file descriptors of POSIX sockets are not set so `write` and `read` can be used. This fixes that.
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- describe which part(s) of RIOT is (are) involved
- if it's a bug fix, describe the bug that it solves and how it is solved
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### Testing procedure
Flash and run the application provided in #11212 on 2 `samr21-xpro`s. Without this PR `echo send` returns "Bad file descriptor" as its `write()` call ends up here

Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
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### Issues/PRs references
Fixes #11212.

Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * posix_sockets: set read/write permissions for socket fd

-- File Changes --

    M sys/posix/sockets/posix_sockets.c (5)

-- Patch Links --


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