Fixopen is a small tool to fix interrupted systemcalls on OSX Big Sur when using postgres.

It works by installing a dynamic linked library in the postgres bin directory together with a small bash script to spawn postgres with the linked library preloaded.

The linked library has a wrapper around the open function from the standard library to keep retrying the open call as long as the error is EINTR (upto 1000 times for safety).

With postgres on your path run the following:

make install

Now when invoking pg_ctl add a -p /path/to/postgres/bin/postgres.fixopen, or if postgres is on your path add -p $(which postgres.fixopen). Tooling could check for the existance of postgres.fixopen and automatically add the -p ... flag to its invocation of pg_ctl.