bin/59987: [PATCH] tests/bin/t_dd: require /dev/fd be mounted for :length

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>Number:         59987
>Category:       bin
>Synopsis:       [PATCH] tests/bin/t_dd: require /dev/fd be mounted for :length
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Sun Feb 08 23:00:00 +0000 2026
>Originator:     Enji Cooper
>Release:        n/a
>Organization:
>Environment:
n/a
>Description:
NetBSD mounts /dev/fd by default, but FreeBSD does not. Require the character device to exist when running the tests so the tests pass/fail correctly when /dev/fd is not mounted.

Obtained from: FreeBSD.
>How-To-Repeat:
- Run `umount -f /dev/fd` as root.
- Run `bin/dd` tests.
>Fix:
https://patch-diff.githubusercontent.com/raw/NetBSD/src/pull/66.patch