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| 1 // Copyright 2012 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_PA
THNAME */, -1} |
| 14 |
| 15 n := uintptr(0) |
| 16 // get length |
| 17 _, _, err := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Point
er(&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.Pointe
r(&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 } |
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