Function fdlimit::raise_fd_limit

pub fn raise_fd_limit() -> Option<u64>

Raise the soft open file descriptor resource limit to the smaller of the kernel limit and the hard resource limit.

Returns Some with the new limit.

Panics

Panics if libc::sysctl, libc::getrlimit or libc::setrlimit fail.

darwin_fd_limit exists to work around an issue where launchctl on Mac OS X defaults the rlimit maxfiles to 256/unlimited. The default soft limit of 256 ends up being far too low for our multithreaded scheduler testing, depending on the number of cores available.