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raise_fd_limit.rs
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raise_fd_limit.rs
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/// 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", target_os = "watchos"))]
#[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() {}