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sigfastblock(2) on FreeBSD

The text 1045a86a6e40, as FreeBSD 14.2-RELEASE, FreeBSD 14.1-RELEASE, FreeBSD 13.5-RELEASE, FreeBSD 13.4-RELEASE, FreeBSD 13.3-RELEASE shipped it.

controls signals blocking with a simple memory write

sigfastblock(2) on FreeBSD now