[riot-notifications] [RIOT-OS/RIOT] net/gcoap: change return type from gcoap_req_send() to ssize_t (#16526)

János Brodbeck notifications at github.com
Fri Jun 4 17:02:50 CEST 2021


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### Contribution description
`gcoap_req_send()` does not allow returning negative values to indicate errors. For the support of DTLS in gcoap it is useful to return error codes here to specify what went wrong (e.g. authentication failed) and not only return that 0 bytes were sent. 

This PR only changes the return type from `size_t` to `ssize_t` to allow this.
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### Testing procedure

Reading and compiling examples/gcoap should be enough. It works the same as before.

### Issues/PRs references

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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/16526

-- Commit Summary --

  * net/gcoap: change return type from gcoap_req_send() to ssize_t

-- File Changes --

    M sys/include/net/gcoap.h (6)
    M sys/net/application_layer/gcoap/gcoap.c (6)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/16526.patch
https://github.com/RIOT-OS/RIOT/pull/16526.diff

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