1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
/// 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.
///
/// This fixes issue #7772.
#[cfg(any(target_os = "macos", target_os = "ios"))]
#[allow(non_camel_case_types)]
pub unsafe fn raise_fd_limit() {
use libc;
use std::cmp;
use std::io;
use std::mem::size_of_val;
use std::ptr::null_mut;
type rlim_t = libc::uint64_t;
#[repr(C)]
struct rlimit {
rlim_cur: rlim_t,
rlim_max: rlim_t
}
extern {
// name probably doesn't need to be mut, but the C function doesn't
// specify const
fn sysctl(name: *mut libc::c_int, namelen: libc::c_uint,
oldp: *mut libc::c_void, oldlenp: *mut libc::size_t,
newp: *mut libc::c_void, newlen: libc::size_t) -> libc::c_int;
fn getrlimit(resource: libc::c_int, rlp: *mut rlimit) -> libc::c_int;
fn setrlimit(resource: libc::c_int, rlp: *const rlimit) -> libc::c_int;
}
static CTL_KERN: libc::c_int = 1;
static KERN_MAXFILESPERPROC: libc::c_int = 29;
static RLIMIT_NOFILE: libc::c_int = 8;
// 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 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 = rlimit{rlim_cur: 0, rlim_max: 0};
if getrlimit(RLIMIT_NOFILE, &mut rlim) != 0 {
let err = io::Error::last_os_error();
panic!("raise_fd_limit: error calling getrlimit: {}", err);
}
// Bump the soft limit to the smaller of kern.maxfilesperproc and the hard
// limit
rlim.rlim_cur = cmp::min(maxfiles as rlim_t, rlim.rlim_max);
// Set our newly-increased resource limit
if setrlimit(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() {}
|
