| /// darwin_fd_limit exists to work around an issue where launchctl on macOS |
| /// 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. |
| /// |
| /// This fixes issue #7772. |
| #[cfg(any(target_os = "macos", target_os = "ios"))] |
| #[allow(non_camel_case_types)] |
| pub unsafe fn raise_fd_limit() { |
| use std::cmp; |
| use std::io; |
| use std::mem::size_of_val; |
| use std::ptr::null_mut; |
| |
| static CTL_KERN: libc::c_int = 1; |
| static KERN_MAXFILESPERPROC: libc::c_int = 29; |
| |
| // The strategy here is to fetch the current resource limits, read the |
| // kern.maxfilesperproc sysctl value, and bump the soft resource limit for |
| // maxfiles up to the sysctl value. |
| |
| // Fetch the kern.maxfilesperproc value |
| let mut mib: [libc::c_int; 2] = [CTL_KERN, KERN_MAXFILESPERPROC]; |
| let mut maxfiles: libc::c_int = 0; |
| let mut size: libc::size_t = size_of_val(&maxfiles) as libc::size_t; |
| if libc::sysctl( |
| &mut mib[0], |
| 2, |
| &mut maxfiles as *mut _ as *mut _, |
| &mut size, |
| null_mut(), |
| 0, |
| ) != 0 |
| { |
| let err = io::Error::last_os_error(); |
| panic!("raise_fd_limit: error calling sysctl: {}", err); |
| } |
| |
| // Fetch the current resource limits |
| let mut rlim = libc::rlimit { |
| rlim_cur: 0, |
| rlim_max: 0, |
| }; |
| if libc::getrlimit(libc::RLIMIT_NOFILE, &mut rlim) != 0 { |
| let err = io::Error::last_os_error(); |
| panic!("raise_fd_limit: error calling getrlimit: {}", err); |
| } |
| |
| // Make sure we're only ever going to increase the rlimit. |
| if rlim.rlim_cur < maxfiles as libc::rlim_t { |
| // Bump the soft limit to the smaller of kern.maxfilesperproc and the hard limit. |
| rlim.rlim_cur = cmp::min(maxfiles as libc::rlim_t, rlim.rlim_max); |
| |
| // Set our newly-increased resource limit. |
| if libc::setrlimit(libc::RLIMIT_NOFILE, &rlim) != 0 { |
| let err = io::Error::last_os_error(); |
| panic!("raise_fd_limit: error calling setrlimit: {}", err); |
| } |
| } |
| } |
| |
| #[cfg(not(any(target_os = "macos", target_os = "ios")))] |
| pub unsafe fn raise_fd_limit() {} |