Setting the SA_RESTART flag using sigaction[1], which Postgres does, makes it invalid behaviour. Even according to Apple's (confusingly worded) documentation[2]

Setting the SA_RESTART flag using sigaction[1], which Postgres does, makes it invalid behaviour. Even according to Apple's (confusingly worded) documentation[2]. [1]:https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigaction.html https://pubs.opengroup.org/onlinepubs/9699919799/functions/s... [2]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/sigaction.2.html https://developer.apple.com/library/archive/documentation/Sy...