github.com/nats-io/nats-server/v2@v2.11.0-preview.2/server/sysmem/sysctl.go (about)

     1  // Copyright 2019-2024 The NATS Authors
     2  // Licensed under the Apache License, Version 2.0 (the "License");
     3  // you may not use this file except in compliance with the License.
     4  // You may obtain a copy of the License at
     5  //
     6  // http://www.apache.org/licenses/LICENSE-2.0
     7  //
     8  // Unless required by applicable law or agreed to in writing, software
     9  // distributed under the License is distributed on an "AS IS" BASIS,
    10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  //go:build darwin || freebsd || openbsd || dragonfly || netbsd
    15  // +build darwin freebsd openbsd dragonfly netbsd
    16  
    17  package sysmem
    18  
    19  import (
    20  	"syscall"
    21  	"unsafe"
    22  )
    23  
    24  func sysctlInt64(name string) int64 {
    25  	s, err := syscall.Sysctl(name)
    26  	if err != nil {
    27  		return 0
    28  	}
    29  	// Make sure it's 8 bytes when we do the cast below.
    30  	// We were getting fatal error: checkptr: converted pointer straddles multiple allocations in go 1.22.1 on darwin.
    31  	var b [8]byte
    32  	copy(b[:], s)
    33  	return *(*int64)(unsafe.Pointer(&b[0]))
    34  }