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fdlimit_unix.go
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/
fdlimit_unix.go
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// Copyright (c) 2018 The MATRIX Authors
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php
// +build linux darwin netbsd openbsd solaris
package fdlimit
import "syscall"
// Raise tries to maximize the file descriptor allowance of this process
// to the maximum hard-limit allowed by the OS.
func Raise(max uint64) error {
// Get the current limit
var limit syscall.Rlimit
if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
return err
}
// Try to update the limit to the max allowance
limit.Cur = limit.Max
if limit.Cur > max {
limit.Cur = max
}
if err := syscall.Setrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
return err
}
return nil
}
// Current retrieves the number of file descriptors allowed to be opened by this
// process.
func Current() (int, error) {
var limit syscall.Rlimit
if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
return 0, err
}
return int(limit.Cur), nil
}
// Maximum retrieves the maximum number of file descriptors this process is
// allowed to request for itself.
func Maximum() (int, error) {
var limit syscall.Rlimit
if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
return 0, err
}
return int(limit.Max), nil
}