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// Copyright 2015 The go4 Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build amd64,solaris
package osutil
import (
"os"
"syscall"
"unsafe"
)
//go:cgo_import_dynamic libc_getexecname getexecname "libc.so"
//go:linkname libc_getexecname libc_getexecname
var libc_getexecname uintptr
func getexecname() (path unsafe.Pointer, err error) {
r0, _, e1 := syscall.Syscall6(uintptr(unsafe.Pointer(&libc_getexecname)), 0, 0, 0, 0, 0, 0)
path = unsafe.Pointer(r0)
if e1 != 0 {
err = syscall.Errno(e1)
}
return
}
func syscallGetexecname() (path string, err error) {
ptr, err := getexecname()
if err != nil {
return "", err
}
bytes := (*[1 << 29]byte)(ptr)[:]
for i, b := range bytes {
if b == 0 {
return string(bytes[:i]), nil
}
}
panic("unreachable")
}
var initCwd, initCwdErr = os.Getwd()
func executable() (string, error) {
path, err := syscallGetexecname()
if err != nil {
return path, err
}
if len(path) > 0 && path[0] != '/' {
if initCwdErr != nil {
return path, initCwdErr
}
if len(path) > 2 && path[0:2] == "./" {
// skip "./"
path = path[2:]
}
return initCwd + "/" + path, nil
}
return path, nil
}
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