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a3c724f2c3
all: Add package runtimeos for runtime.GOOS comparisons I grew tired of hand written string comparisons. This adds generated constants for the GOOS values, and predefined Is$OS constants that can be iffed on. In a couple of places I rewrote trivial switch:es to if:s, and added Illumos where we checked for Solaris (because they are effectively the same, and if we're going to target one of them that would be Illumos...).
63 lines
1.8 KiB
Go
63 lines
1.8 KiB
Go
// Copyright (C) 2015 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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//go:build !windows
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// +build !windows
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package osutil
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import (
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"syscall"
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"github.com/syncthing/syncthing/lib/build"
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)
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const (
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darwinOpenMax = 10240
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)
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// MaximizeOpenFileLimit tries to set the resource limit RLIMIT_NOFILE (number
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// of open file descriptors) to the max (hard limit), if the current (soft
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// limit) is below the max. Returns the new (though possibly unchanged) limit,
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// or an error if it could not be changed.
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func MaximizeOpenFileLimit() (int, error) {
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// Get the current limit on number of open files.
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var lim syscall.Rlimit
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if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &lim); err != nil {
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return 0, err
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}
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// If we're already at max, there's no need to try to raise the limit.
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if lim.Cur >= lim.Max {
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return int(lim.Cur), nil
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}
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// macOS doesn't like a soft limit greater then OPEN_MAX
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// See also: man setrlimit
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if build.IsDarwin && lim.Max > darwinOpenMax {
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lim.Max = darwinOpenMax
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}
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// Try to increase the limit to the max.
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oldLimit := lim.Cur
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lim.Cur = lim.Max
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if err := syscall.Setrlimit(syscall.RLIMIT_NOFILE, &lim); err != nil {
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return int(oldLimit), err
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}
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// If the set succeeded, perform a new get to see what happened. We might
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// have gotten a value lower than the one in lim.Max, if lim.Max was
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// something that indicated "unlimited" (i.e. intmax).
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if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &lim); err != nil {
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// We don't really know the correct value here since Getrlimit
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// mysteriously failed after working once... Shouldn't ever happen, I
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// think.
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return 0, err
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}
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return int(lim.Cur), nil
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}
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