distribution/vendor/github.com/bugsnag/osext/osext_sysctl.go

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// 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"
"runtime"
"syscall"
"unsafe"
)
var startUpcwd, getwdError = 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
_, _, err := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
if err != 0 {
return "", err
}
if n == 0 { // shouldn't happen
return "", nil
}
buf := make([]byte, n)
_, _, err = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0, 0)
if err != 0 {
return "", err
}
if n == 0 { // shouldn't happen
return "", nil
}
for i, v := range buf {
if v == 0 {
buf = buf[:i]
break
}
}
if buf[0] != '/' {
if getwdError != nil {
return string(buf), getwdError
} else {
if buf[0] == '.' {
buf = buf[1:]
}
if startUpcwd[len(startUpcwd)-1] != '/' {
return startUpcwd + "/" + string(buf), nil
}
return startUpcwd + string(buf), nil
}
}
return string(buf), nil
}