[gnutls-devel] GnuTLS | tests: ignore SIGPIPE in forking tests if the parent is TLS client (!1772)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1772

Project:Branches: dueno/gnutls:wip/dueno/sigpipe to gnutls/gnutls:master
Author:   Daiki Ueno




If the tests are forking and the parent process is a client, care must
be taken to handle SIGPIPE reported by the child process (server) when
the client closes the connection.

This hadn't been exposed until commit
dd79ac9bcf90012e090726adf7c1940bcce8333f, thanks to the fact that the
parent process kept the other pipe end which effectively prevented a
"broken pipe".

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)
 * [ ] CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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