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- // Copyright 2018 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/>.
- package fdlimit
- import "fmt"
- // hardlimit is the number of file descriptors allowed at max by the kernel.
- const hardlimit = 16384
- // Raise tries to maximize the file descriptor allowance of this process
- // to the maximum hard-limit allowed by the OS.
- func Raise(max uint64) (uint64, error) {
- // This method is NOP by design:
- // * Linux/Darwin counterparts need to manually increase per process limits
- // * On Windows Go uses the CreateFile API, which is limited to 16K files, non
- // changeable from within a running process
- // This way we can always "request" raising the limits, which will either have
- // or not have effect based on the platform we're running on.
- if max > hardlimit {
- return hardlimit, fmt.Errorf("file descriptor limit (%d) reached", hardlimit)
- }
- return max, nil
- }
- // Current retrieves the number of file descriptors allowed to be opened by this
- // process.
- func Current() (int, error) {
- // Please see Raise for the reason why we use hard coded 16K as the limit
- return hardlimit, nil
- }
- // Maximum retrieves the maximum number of file descriptors this process is
- // allowed to request for itself.
- func Maximum() (int, error) {
- return Current()
- }
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