On Tue, Jun 6, 2017 at 1:33 PM, Tom Lane <t...@sss.pgh.pa.us> wrote: >> I think that's a pretty good argument, really. If there exists a >> platform where only sig_atomic_t is safe to read from a signal >> handler, then we already don't work on that platform. Even saving and >> restoring errno isn't safe in that case. > > That's an argument from false premises. The question here is what types > are safe for an interrupt handler to *change*, not what can it read.
OK, but we certainly have code in signal handlers that does: int save_errno = errno; /* stuff */ errno = save_errno; If that's not a signal handler changing an int, color me confused. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers