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- // Copyright 2016 The go-ethereum Authors
- // This file is part of the go-ethereum library.
- //
- // The go-ethereum library is free software: you can redistribute it and/or modify
- // it under the terms of the GNU Lesser General Public License as published by
- // the Free Software Foundation, either version 3 of the License, or
- // (at your option) any later version.
- //
- // The go-ethereum library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU Lesser General Public License for more details.
- //
- // You should have received a copy of the GNU Lesser General Public License
- // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
- // +build linux 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.
- // Returns the size it was set to (may differ from the desired 'max')
- func Raise(max uint64) (uint64, error) {
- // Get the current limit
- var limit syscall.Rlimit
- if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
- return 0, 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 0, err
- }
- // MacOS can silently apply further caps, so retrieve the actually set limit
- if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
- return 0, err
- }
- return limit.Cur, 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
- }
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