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80 lines
2.0 KiB
80 lines
2.0 KiB
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin freebsd
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package osext
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import (
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"os"
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"path/filepath"
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"runtime"
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"syscall"
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"unsafe"
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)
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var initCwd, initCwdErr = os.Getwd()
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func executable() (string, error) {
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var mib [4]int32
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switch runtime.GOOS {
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case "freebsd":
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mib = [4]int32{1 /* CTL_KERN */, 14 /* KERN_PROC */, 12 /* KERN_PROC_PATHNAME */, -1}
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case "darwin":
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mib = [4]int32{1 /* CTL_KERN */, 38 /* KERN_PROCARGS */, int32(os.Getpid()), -1}
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}
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n := uintptr(0)
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// Get length.
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_, _, errNum := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
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if errNum != 0 {
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return "", errNum
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}
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if n == 0 { // This shouldn't happen.
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return "", nil
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}
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buf := make([]byte, n)
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_, _, errNum = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0, 0)
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if errNum != 0 {
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return "", errNum
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}
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if n == 0 { // This shouldn't happen.
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return "", nil
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}
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for i, v := range buf {
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if v == 0 {
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buf = buf[:i]
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break
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}
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}
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var err error
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execPath := string(buf)
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// execPath will not be empty due to above checks.
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// Try to get the absolute path if the execPath is not rooted.
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if execPath[0] != '/' {
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execPath, err = getAbs(execPath)
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if err != nil {
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return execPath, err
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}
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}
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// For darwin KERN_PROCARGS may return the path to a symlink rather than the
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// actual executable.
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if runtime.GOOS == "darwin" {
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if execPath, err = filepath.EvalSymlinks(execPath); err != nil {
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return execPath, err
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}
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}
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return execPath, nil
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}
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func getAbs(execPath string) (string, error) {
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if initCwdErr != nil {
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return execPath, initCwdErr
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}
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// The execPath may begin with a "../" or a "./" so clean it first.
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// Join the two paths, trailing and starting slashes undetermined, so use
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// the generic Join function.
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return filepath.Join(initCwd, filepath.Clean(execPath)), nil
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}
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