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 type rlim_t = libc::uint64_t;
34 // name probably doesn't need to be mut, but the C function doesn't
36 fn sysctl(name: *mut libc::c_int, namelen: libc::c_uint,
37 oldp: *mut libc::c_void, oldlenp: *mut libc::size_t,
38 newp: *mut libc::c_void, newlen: libc::size_t) -> libc::c_int;
39 fn getrlimit(resource: libc::c_int, rlp: *mut rlimit) -> libc::c_int;
40 fn setrlimit(resource: libc::c_int, rlp: *const rlimit) -> libc::c_int;
42 static CTL_KERN: libc::c_int = 1;
43 static KERN_MAXFILESPERPROC: libc::c_int = 29;
44 static RLIMIT_NOFILE: libc::c_int = 8;
46 // The strategy here is to fetch the current resource limits, read the
47 // kern.maxfilesperproc sysctl value, and bump the soft resource limit for
48 // maxfiles up to the sysctl value.
50 // Fetch the kern.maxfilesperproc value
51 let mut mib: [libc::c_int; 2] = [CTL_KERN, KERN_MAXFILESPERPROC];
52 let mut maxfiles: libc::c_int = 0;
53 let mut size: libc::size_t = size_of_val(&maxfiles) as libc::size_t;
54 if sysctl(&mut mib[0], 2, &mut maxfiles as *mut _ as *mut _, &mut size,
56 let err = io::Error::last_os_error();
57 panic!("raise_fd_limit: error calling sysctl: {}", err);
60 // Fetch the current resource limits
61 let mut rlim = rlimit{rlim_cur: 0, rlim_max: 0};
62 if getrlimit(RLIMIT_NOFILE, &mut rlim) != 0 {
63 let err = io::Error::last_os_error();
64 panic!("raise_fd_limit: error calling getrlimit: {}", err);
67 // Bump the soft limit to the smaller of kern.maxfilesperproc and the hard
69 rlim.rlim_cur = cmp::min(maxfiles as rlim_t, rlim.rlim_max);
71 // Set our newly-increased resource limit
72 if setrlimit(RLIMIT_NOFILE, &rlim) != 0 {
73 let err = io::Error::last_os_error();
74 panic!("raise_fd_limit: error calling setrlimit: {}", err);
78 #[cfg(not(any(target_os = "macos", target_os = "ios")))]
79 pub unsafe fn raise_fd_limit() {}