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64 lines
1.7 KiB
Go
64 lines
1.7 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 freebsd darwin
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package osutil
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import (
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"os"
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"path/filepath"
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"runtime"
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"syscall"
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"unsafe"
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)
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var cacheWD, cacheWDErr = os.Getwd()
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func executable() (string, error) {
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var mib [4]int32
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switch runtime.GOOS {
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case "freebsd":
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mib = [4]int32{1 /* CTL_KERN */, 14 /* KERN_PROC */, 12 /* KERN_PROC_PATHNAME */, -1}
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case "darwin":
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mib = [4]int32{1 /* CTL_KERN */, 38 /* KERN_PROCARGS */, int32(os.Getpid()), -1}
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}
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n := uintptr(0)
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// get length
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_, _, err := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
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if err != 0 {
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return "", err
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}
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if n == 0 { // shouldn't happen
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return "", nil
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}
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buf := make([]byte, n)
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_, _, err = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0, 0)
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if err != 0 {
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return "", err
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}
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if n == 0 { // shouldn't happen
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return "", nil
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}
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p := string(buf[:n-1])
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if !filepath.IsAbs(p) {
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if cacheWDErr != nil {
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return p, cacheWDErr
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}
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p = filepath.Join(cacheWD, filepath.Clean(p))
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}
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return filepath.EvalSymlinks(p)
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}
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