go executable_sysctl 源码
golang executable_sysctl 代码
文件路径：/src/os/executable_sysctl.go
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build freebsd || dragonfly
package os
import (
"syscall"
"unsafe"
)
func executable() (string, error) {
mib := [4]int32{_CTL_KERN, _KERN_PROC, _KERN_PROC_PATHNAME, -1}
n := uintptr(0)
// get length
_, _, err := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
if err != 0 {
return "", err
}
if n == 0 { // shouldn't happen
return "", nil
}
buf := make([]byte, n)
_, _, err = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0, 0)
if err != 0 {
return "", err
}
if n == 0 { // shouldn't happen
return "", nil
}
return string(buf[:n-1]), nil
}
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