1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 /// darwin_fd_limit exists to work around an issue where launchctl on Mac OS X
12 /// defaults the rlimit maxfiles to 256/unlimited. The default soft limit of 256
13 /// ends up being far too low for our multithreaded scheduler testing, depending
14 /// on the number of cores available.
16 /// This fixes issue #7772.
17 #[cfg(any(target_os = "macos", target_os = "ios"))]
18 #[allow(non_camel_case_types)]
19 pub unsafe fn raise_fd_limit() {
23 use std::mem::size_of_val;
24 use std::ptr::null_mut;
26 static CTL_KERN: libc::c_int = 1;
27 static KERN_MAXFILESPERPROC: libc::c_int = 29;
29 // The strategy here is to fetch the current resource limits, read the
30 // kern.maxfilesperproc sysctl value, and bump the soft resource limit for
31 // maxfiles up to the sysctl value.
33 // Fetch the kern.maxfilesperproc value
34 let mut mib: [libc::c_int; 2] = [CTL_KERN, KERN_MAXFILESPERPROC];
35 let mut maxfiles: libc::c_int = 0;
36 let mut size: libc::size_t = size_of_val(&maxfiles) as libc::size_t;
37 if libc::sysctl(&mut mib[0], 2, &mut maxfiles as *mut _ as *mut _, &mut size,
39 let err = io::Error::last_os_error();
40 panic!("raise_fd_limit: error calling sysctl: {}", err);
43 // Fetch the current resource limits
44 let mut rlim = libc::rlimit{rlim_cur: 0, rlim_max: 0};
45 if libc::getrlimit(libc::RLIMIT_NOFILE, &mut rlim) != 0 {
46 let err = io::Error::last_os_error();
47 panic!("raise_fd_limit: error calling getrlimit: {}", err);
50 // Bump the soft limit to the smaller of kern.maxfilesperproc and the hard
52 rlim.rlim_cur = cmp::min(maxfiles as libc::rlim_t, rlim.rlim_max);
54 // Set our newly-increased resource limit
55 if libc::setrlimit(libc::RLIMIT_NOFILE, &rlim) != 0 {
56 let err = io::Error::last_os_error();
57 panic!("raise_fd_limit: error calling setrlimit: {}", err);
61 #[cfg(not(any(target_os = "macos", target_os = "ios")))]
62 pub unsafe fn raise_fd_limit() {}