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utils: Add pv_async_signal_safe_error()
This gives us a way to report failure in a signal handler, or between
fork() and exec(), both of which are contexts where only a restricted
set of async-signal-safe functions are allowed. See signal-safety(7),
signal(7) and fork(2) for details.
Signed-off-by:
Simon McVittie <smcv@collabora.com>
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