LibBSD | freebsd/sys_generic: Prevent multiple FD mappings (!66)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/66

Project:Branches: opticron/rtems-libbsd:main-fix-selfd-handling to rtems/pkg/rtems-libbsd:main
Author:   Kinsey Moore
Assignee: Kinsey Moore



## Summary

freebsd/sys_generic: Prevent multiple FD mappings

When the selscan() and selrescan() functions were modified for use with
RTEMS, the already-mapped FD was stored in selfd->sf_cookie by selscan()
contrary to the modified behavior of pollscan() which stores an unmapped
FD (wrapped inside a struct) in sf_cookie. This stored mapped FD was
then mapped again into libbsd FD space in selrescan() which resulted in
EBADF since there was no open FD in the lower range that libbsd FD space
FDs typically occupy compared to RTEMS FD space.

The fix is to only store unmapped FDs into selfd->sf_cookie by passing
the unmapped FD into selfdalloc() instead of the already-mapped FD.


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