1 // Copyright 2016 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package os 6 7 import ( 8 "syscall" 9 "unsafe" 10 ) 11 12 func executable() (string, error) { 13 mib := [4]int32{1 /* CTL_KERN */, 14 /* KERN_PROC */, 12 /* KERN_PROC_PATHNAME */, -1} 14 15 n := uintptr(0) 16 // get length 17 _, _, err := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0) 18 if err != 0 { 19 return "", err 20 } 21 if n == 0 { // shouldn't happen 22 return "", nil 23 } 24 buf := make([]byte, n) 25 _, _, err = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0, 0) 26 if err != 0 { 27 return "", err 28 } 29 if n == 0 { // shouldn't happen 30 return "", nil 31 } 32 return string(buf[:n-1]), nil 33 } 34
