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51 lines
1.7 KiB
51 lines
1.7 KiB
// 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 according 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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