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Delta Between Two Patch Sets: src/pkg/os/executable_freebsd.go

Issue 6736069: code review 6736069: runtime, syscall, os: add os.ExecPath() (string, error)
Left Patch Set: diff -r 88c4bdf6cfb8 https://code.google.com/p/go/ Created 11 years, 5 months ago
Right Patch Set: diff -r 617db9efbdf1 https://code.google.com/p/go/ Created 11 years, 3 months ago
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LEFTRIGHT
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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 }
LEFTRIGHT

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