RTEMS | open: Fix race condition when called with O_TRUNC (!178)

[Loris Nardo (@loris.nardo)]

Loris Nardo created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/178

Project:Branches: loris.nardo/rtems:open-truncate-race-close to rtems/rtos/rtems:main
Author:   Loris Nardo




## Summary

open: Fix race condition when called with O_TRUNC

Fix a race condition in which a file opened with O_TRUNC is made available to other file functions expecting a file descriptor before the truncation is performed.

This is only possible if the other thread was using an invalid file descriptor as the open call has yet to finish.

Closes #5109


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