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package godaemon
// Copyright (c) 2013 VividCortex, Inc. All rights reserved.
// Please see the LICENSE file for applicable license terms.
//#include <sys/types.h>
//#include <sys/sysctl.h>
import "C"
import (
"bytes"
"fmt"
"path/filepath"
"unsafe"
)
// GetExecutablePath returns the absolute path to the currently running
// executable. It is used internally by the godaemon package, and exported
// publicly because it's useful outside of the package too.
func GetExecutablePath() (string, error) {
PATH_MAX := 1024 // From <sys/syslimits.h>
exePath := make([]byte, PATH_MAX)
exeLen := C.size_t(len(exePath))
// Beware: sizeof(int) != sizeof(C.int)
var mib [4]C.int
// From <sys/sysctl.h>
mib[0] = 1 // CTL_KERN
mib[1] = 14 // KERN_PROC
mib[2] = 12 // KERN_PROC_PATHNAME
mib[3] = -1
status, err := C.sysctl((*C.int)(unsafe.Pointer(&mib[0])), 4, unsafe.Pointer(&exePath[0]), &exeLen, nil, 0)
if err != nil {
return "", fmt.Errorf("sysctl: %v", err)
}
// Not sure why this might happen with err being nil, but...
if status != 0 {
return "", fmt.Errorf("sysctl returned %d", status)
}
// Convert from null-padded []byte to a clean string. (Can't simply cast!)
exePathStringLen := bytes.Index(exePath, []byte{0})
exePathString := string(exePath[:exePathStringLen])
return filepath.Clean(exePathString), nil
}
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