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// Copyright 2015 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package runtime implements utility functions for runtime systems.
package runtime
import (
"os"
"syscall"
)
func FDLimit() (uint64, error) {
var rlimit syscall.Rlimit
if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rlimit); err != nil {
return 0, err
}
return rlimit.Cur, nil
}
func FDUsage() (uint64, error) {
return countFiles("/proc/self/fd")
}
// countFiles reads the directory named by dirname and returns the count.
func countFiles(dirname string) (uint64, error) {
f, err := os.Open(dirname)
if err != nil {
return 0, err
}
list, err := f.Readdirnames(-1)
f.Close()
if err != nil {
return 0, err
}
return uint64(len(list)), nil
}
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