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