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52 lines
1.7 KiB
Go
52 lines
1.7 KiB
Go
// Copyright 2017 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !windows
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package runtime
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import (
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"fmt"
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"math"
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"syscall"
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)
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// syscall.RLIM_INFINITY is a constant.
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// Its type is int on most architectures but there are exceptions such as loong64.
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// Uniform it to uint accorind to the standard.
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// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_resource.h.html
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var unlimited uint64 = syscall.RLIM_INFINITY & math.MaxUint64
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func limitToString(v uint64, unit string) string {
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if v == unlimited {
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return "unlimited"
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}
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return fmt.Sprintf("%d%s", v, unit)
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}
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func getLimits(resource int, unit string) string {
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rlimit := syscall.Rlimit{}
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err := syscall.Getrlimit(resource, &rlimit)
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if err != nil {
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panic("syscall.Getrlimit failed: " + err.Error())
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}
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// rlimit.Cur and rlimit.Max are int64 on some platforms, such as dragonfly.
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// We need to cast them explicitly to uint64.
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return fmt.Sprintf("(soft=%s, hard=%s)", limitToString(uint64(rlimit.Cur), unit), limitToString(uint64(rlimit.Max), unit)) //nolint:unconvert
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}
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// FdLimits returns the soft and hard limits for file descriptors.
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func FdLimits() string {
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return getLimits(syscall.RLIMIT_NOFILE, "")
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}
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