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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
//go:build !windows
package util
import (
"os"
"strconv"
"github.com/vespa-engine/vespa/client/go/internal/admin/trace"
"golang.org/x/sys/unix"
)
type ResourceId int
const (
RLIMIT_CORE ResourceId = unix.RLIMIT_CORE
RLIMIT_NOFILE ResourceId = unix.RLIMIT_NOFILE
RLIMIT_NPROC ResourceId = unix.RLIMIT_NPROC
NO_RLIMIT uint64 = ^uint64(0)
)
func (rid ResourceId) String() string {
switch rid {
case RLIMIT_CORE:
return "core file size"
case RLIMIT_NOFILE:
return "open files"
case RLIMIT_NPROC:
return "max user processes"
}
return "unknown resource id"
}
func readableLimit(val uint64) string {
if val == NO_RLIMIT {
return "unlimited"
}
return strconv.FormatUint(val, 10)
}
func SetResourceLimit(resource ResourceId, newVal uint64) {
trace.Debug("Wanted", newVal, "as limit for", resource.String())
var current unix.Rlimit
err := unix.Getrlimit(int(resource), ¤t)
if err != nil {
trace.Warning("Could not get current resource limit:", err)
return
}
wanted := current
if current.Max < newVal {
if os.Getuid() == 0 {
wanted.Max = newVal
} else if newVal > current.Max {
trace.Warning(
"Wanted", newVal,
"as limit for", resource.String(),
"but cannot exceed current hard limit:", current.Max)
newVal = current.Max
}
}
wanted.Cur = newVal
err = unix.Setrlimit(int(resource), &wanted)
if err != nil {
trace.Trace("Failed setting limit for", resource, ":", err)
} else {
trace.Debug("Resource limit", resource, "was:", readableLimit(current.Cur), "/", readableLimit(current.Max))
_ = unix.Getrlimit(int(resource), ¤t)
trace.Trace("Resource limit", resource, "adjusted to:", readableLimit(current.Cur), "/", readableLimit(current.Max))
}
}
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