68 lines
2.6 KiB
Rust
68 lines
2.6 KiB
Rust
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/// darwin_fd_limit exists to work around an issue where launchctl on Mac OS X
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/// defaults the rlimit maxfiles to 256/unlimited. The default soft limit of 256
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/// ends up being far too low for our multithreaded scheduler testing, depending
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/// on the number of cores available.
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///
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/// This fixes issue #7772.
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#[cfg(any(target_os = "macos", target_os = "ios"))]
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#[allow(non_camel_case_types)]
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pub fn raise_fd_limit() {
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use libc;
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type rlim_t = libc::uint64_t;
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#[repr(C)]
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struct rlimit {
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rlim_cur: rlim_t,
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rlim_max: rlim_t
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}
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extern {
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// name probably doesn't need to be mut, but the C function doesn't
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// specify const
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fn sysctl(name: *mut libc::c_int, namelen: libc::c_uint,
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oldp: *mut libc::c_void, oldlenp: *mut libc::size_t,
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newp: *mut libc::c_void, newlen: libc::size_t) -> libc::c_int;
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fn getrlimit(resource: libc::c_int, rlp: *mut rlimit) -> libc::c_int;
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fn setrlimit(resource: libc::c_int, rlp: *const rlimit) -> libc::c_int;
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}
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static CTL_KERN: libc::c_int = 1;
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static KERN_MAXFILESPERPROC: libc::c_int = 29;
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static RLIMIT_NOFILE: libc::c_int = 8;
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// The strategy here is to fetch the current resource limits, read the
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// kern.maxfilesperproc sysctl value, and bump the soft resource limit for
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// maxfiles up to the sysctl value.
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use ptr::null_mut;
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use mem::size_of_val;
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use io;
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// Fetch the kern.maxfilesperproc value
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let mut mib: [libc::c_int; 2] = [CTL_KERN, KERN_MAXFILESPERPROC];
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let mut maxfiles: libc::c_int = 0;
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let mut size: libc::size_t = size_of_val(&maxfiles) as libc::size_t;
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if sysctl(&mut mib[0], 2, &mut maxfiles as *mut _ as *mut _, &mut size,
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null_mut(), 0) != 0 {
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let err = io::Error::last_os_error();
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panic!("raise_fd_limit: error calling sysctl: {}", err);
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}
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// Fetch the current resource limits
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let mut rlim = rlimit{rlim_cur: 0, rlim_max: 0};
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if getrlimit(RLIMIT_NOFILE, &mut rlim) != 0 {
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let err = io::Error::last_os_error();
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panic!("raise_fd_limit: error calling getrlimit: {}", err);
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}
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// Bump the soft limit to the smaller of kern.maxfilesperproc and the hard
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// limit
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rlim.rlim_cur = ::cmp::min(maxfiles as rlim_t, rlim.rlim_max);
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// Set our newly-increased resource limit
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if setrlimit(RLIMIT_NOFILE, &rlim) != 0 {
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let err = io::Error::last_os_error();
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panic!("raise_fd_limit: error calling setrlimit: {}", err);
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}
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}
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#[cfg(not(any(target_os = "macos", target_os = "ios")))]
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pub fn raise_fd_limit() {}
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