common/fdlimit: Move fdlimit files to separate package (#15850)

* common/fdlimit: Move fdlimit files to separate package

When go-ethereum is used as a library the calling program need to set
the FD limit.

This commit extract fdlimit files to a separate package so it can be
used outside of go-ethereum.

* common/fdlimit: Remove FdLimit from functions signature

* common/fdlimit: Rename fdlimit functions

1 files changed, 0 insertions, 47 deletions

diff --git a/cmd/utils/fdlimit_windows.go b/cmd/utils/fdlimit_windows.go
deleted file mode 100644
index f239683d2..000000000
--- a/cmd/utils/fdlimit_windows.go
+++ /dev/null
@@ -1,47 +0,0 @@
-// Copyright 2016 The go-ethereum Authors
-// This file is part of go-ethereum.
-//
-// go-ethereum is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// go-ethereum 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 General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
-
-package utils
-
-import "errors"
-
-// raiseFdLimit tries to maximize the file descriptor allowance of this process
-// to the maximum hard-limit allowed by the OS.
-func raiseFdLimit(max 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 > 16384 {
-		return errors.New("file descriptor limit (16384) reached")
-	}
-	return nil
-}
-
-// getFdLimit retrieves the number of file descriptors allowed to be opened by this
-// process.
-func getFdLimit() (int, error) {
-	// Please see raiseFdLimit for the reason why we use hard coded 16K as the limit
-	return 16384, nil
-}
-
-// getFdMaxLimit retrieves the maximum number of file descriptors this process is
-// allowed to request for itself.
-func getFdMaxLimit() (int, error) {
-	return getFdLimit()
-}