1 files changed, 69 insertions, 0 deletions
diff --git a/vendor/compiletest_rs/src/raise_fd_limit.rs b/vendor/compiletest_rs/src/raise_fd_limit.rs
new file mode 100644
index 000000000..fcc5a727c
--- /dev/null
+++ b/vendor/compiletest_rs/src/raise_fd_limit.rs
@@ -0,0 +1,69 @@
+// 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 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"))]
+#[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;
+
+    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);
+    }
+
+    // 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() {}