Module Name: src
Committed By: riastradh
Date: Sun Mar 2 22:46:24 UTC 2025
Modified Files:
src/lib/libc/gen: arc4random.c pthread_atfork.c
Log Message:
libc: New __libc_atfork.
This uses caller-provided storage for the callback queues.
Use it in arc4random(3) in order to avoid possible failure modes.
This is a private symbol, not designed for use outside NetBSD, and
the API is not intended to be stable (yet) -- I just took the
existing purely internal structure (struct atfork_callback) and
reused it for this API without changing any of the calling-side
logic. We could change it, e.g. to use a single structure per call,
to make the API a little less unwieldy, at the cost of
microscopically more storage and runtime for the users that don't use
all three callbacks; to be considered in a future change.
We might reasonably use __libc_atfork in libpthread for use in the
pthread_tsd_init constructor, in order to be confident it never
attempts malloc(3), but let's do that in a separate commit just in
case anything goes awry with that plan.
PR lib/59112: libpthread constructors use malloc
PR lib/59117: arc4random has some failure modes it shouldn't
To generate a diff of this commit:
cvs rdiff -u -r1.39 -r1.40 src/lib/libc/gen/arc4random.c
cvs rdiff -u -r1.23 -r1.24 src/lib/libc/gen/pthread_atfork.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
