executable_procfs.go

Documentation: os

     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  //go:build linux || netbsd || (js && wasm)
     6  // +build linux netbsd js,wasm
     7  
     8  package os
     9  
    10  import (
    11  	"errors"
    12  	"runtime"
    13  )
    14  
    15  func executable() (string, error) {
    16  	var procfn string
    17  	switch runtime.GOOS {
    18  	default:
    19  		return "", errors.New("Executable not implemented for " + runtime.GOOS)
    20  	case "linux", "android":
    21  		procfn = "/proc/self/exe"
    22  	case "netbsd":
    23  		procfn = "/proc/curproc/exe"
    24  	}
    25  	path, err := Readlink(procfn)
    26  
    27  	// When the executable has been deleted then Readlink returns a
    28  	// path appended with " (deleted)".
    29  	return stringsTrimSuffix(path, " (deleted)"), err
    30  }
    31  
    32  // stringsTrimSuffix is the same as strings.TrimSuffix.
    33  func stringsTrimSuffix(s, suffix string) string {
    34  	if len(s) >= len(suffix) && s[len(s)-len(suffix):] == suffix {
    35  		return s[:len(s)-len(suffix)]
    36  	}
    37  	return s
    38  }
    39
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