You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
80 lines
2.0 KiB
80 lines
2.0 KiB
7 years ago
|
// Copyright 2012 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.
|
||
|
|
|
||
|
|
// +build darwin freebsd
|
||
|
|
|
||
|
|
package osext
|
||
|
|
|
||
|
|
import (
|
||
|
|
"os"
|
||
|
|
"path/filepath"
|
||
|
|
"runtime"
|
||
|
|
"syscall"
|
||
|
|
"unsafe"
|
||
|
|
)
|
||
|
|
|
||
|
|
var initCwd, initCwdErr = os.Getwd()
|
||
|
|
|
||
|
|
func executable() (string, error) {
|
||
|
|
var mib [4]int32
|
||
|
|
switch runtime.GOOS {
|
||
|
|
case "freebsd":
|
||
|
|
mib = [4]int32{1 /* CTL_KERN */, 14 /* KERN_PROC */, 12 /* KERN_PROC_PATHNAME */, -1}
|
||
|
|
case "darwin":
|
||
|
|
mib = [4]int32{1 /* CTL_KERN */, 38 /* KERN_PROCARGS */, int32(os.Getpid()), -1}
|
||
|
|
}
|
||
|
|
|
||
|
|
n := uintptr(0)
|
||
|
|
// Get length.
|
||
|
|
_, _, errNum := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
|
||
|
|
if errNum != 0 {
|
||
|
|
return "", errNum
|
||
|
|
}
|
||
|
|
if n == 0 { // This shouldn't happen.
|
||
|
|
return "", nil
|
||
|
|
}
|
||
|
|
buf := make([]byte, n)
|
||
|
|
_, _, errNum = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0, 0)
|
||
|
|
if errNum != 0 {
|
||
|
|
return "", errNum
|
||
|
|
}
|
||
|
|
if n == 0 { // This shouldn't happen.
|
||
|
|
return "", nil
|
||
|
|
}
|
||
|
|
for i, v := range buf {
|
||
|
|
if v == 0 {
|
||
|
|
buf = buf[:i]
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
var err error
|
||
|
|
execPath := string(buf)
|
||
|
|
// execPath will not be empty due to above checks.
|
||
|
|
// Try to get the absolute path if the execPath is not rooted.
|
||
|
|
if execPath[0] != '/' {
|
||
|
|
execPath, err = getAbs(execPath)
|
||
|
|
if err != nil {
|
||
|
|
return execPath, err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// For darwin KERN_PROCARGS may return the path to a symlink rather than the
|
||
|
|
// actual executable.
|
||
|
|
if runtime.GOOS == "darwin" {
|
||
|
|
if execPath, err = filepath.EvalSymlinks(execPath); err != nil {
|
||
|
|
return execPath, err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return execPath, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func getAbs(execPath string) (string, error) {
|
||
|
|
if initCwdErr != nil {
|
||
|
|
return execPath, initCwdErr
|
||
|
|
}
|
||
|
|
// The execPath may begin with a "../" or a "./" so clean it first.
|
||
|
|
// Join the two paths, trailing and starting slashes undetermined, so use
|
||
|
|
// the generic Join function.
|
||
|
|
return filepath.Join(initCwd, filepath.Clean(execPath)), nil
|
||
|
|
}
|