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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
//go:build !windows
// +build !windows
package util
import (
"fmt"
"syscall"
)
/* misc */
// GetFdLimits returns a current values for file descriptors limits.
func GetFdLimits() (soft uint64, hard uint64, err error) {
var rLimit syscall.Rlimit
err = syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
if err != nil {
return 0, 0, fmt.Errorf("GetFdSoftLimit() err: %w", err)
}
return rLimit.Cur, rLimit.Max, nil
}
// SetFdSoftLimit sets a new file descriptors soft limit.
func SetFdSoftLimit(newLimit uint64) error {
var rLimit syscall.Rlimit
err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
if err != nil {
return fmt.Errorf("SetFdSoftLimit() err: %w", err)
}
rLimit.Cur = newLimit
err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit)
if err != nil {
return fmt.Errorf("SetFdSoftLimit() err: %w", err)
}
return nil
}
// Getrusage gets file descriptors usage statistics
func Getrusage(who int, rusage *syscall.Rusage) (err error) {
err = syscall.Getrusage(who, rusage)
return
}
// GetCurrentProcessTimes gets current process kernel and usermode times
func GetCurrentProcessTimes() (utime int64, stime int64, err error) {
var usage syscall.Rusage
err = syscall.Getrusage(syscall.RUSAGE_SELF, &usage)
if err == nil {
utime = usage.Utime.Nano()
stime = usage.Stime.Nano()
} else {
utime = 0
stime = 0
}
return
}
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