istio

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// Copyright Istio Authors
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//
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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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package app
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// RaiseFileLimits sets the file limit to the maximum allowed, to avoid exhaustion of file descriptors.
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// This is done by setting soft limit == hard limit.
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// Typical container runtimes already do this, but on VMs, etc this is generally not the case, and a limit of 1024 is common -- this is quite low!
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//
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// Go already sets this (https://github.com/golang/go/issues/46279).
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// However, it will restore the original limit for subprocesses (Envoy):
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// https://github.com/golang/go/blob/f0d1195e13e06acdf8999188decc63306f9903f5/src/syscall/rlimit.go#L14.
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// By explicitly doing it ourselves, we get the limit passed through to Envoy.
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//
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// This function returns the new limit additionally, for convenience.
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func RaiseFileLimits() (uint64, error) {
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	return raiseFileLimits()
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}
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