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      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 // +build linux netbsd openbsd dragonfly nacl
      6 
      7 package os
      8 
      9 import (
     10 	"errors"
     11 	"runtime"
     12 )
     13 
     14 // We query the executable path at init time to avoid the problem of
     15 // readlink returns a path appended with " (deleted)" when the original
     16 // binary gets deleted.
     17 var executablePath, executablePathErr = func() (string, error) {
     18 	var procfn string
     19 	switch runtime.GOOS {
     20 	default:
     21 		return "", errors.New("Executable not implemented for " + runtime.GOOS)
     22 	case "linux", "android":
     23 		procfn = "/proc/self/exe"
     24 	case "netbsd":
     25 		procfn = "/proc/curproc/exe"
     26 	case "openbsd":
     27 		procfn = "/proc/curproc/file"
     28 	case "dragonfly":
     29 		procfn = "/proc/curproc/file"
     30 	}
     31 	return Readlink(procfn)
     32 }()
     33 
     34 func executable() (string, error) {
     35 	return executablePath, executablePathErr
     36 }
     37