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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2018 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package osutil
import (
"syscall"
"unsafe"
)
// Symlinkat is a direct pass-through to the symlinkat(2) system call.
func Symlinkat(target string, dirfd int, linkpath string) error {
targetPtr, err := syscall.BytePtrFromString(target)
if err != nil {
return err
}
linkpathPtr, err := syscall.BytePtrFromString(linkpath)
if err != nil {
return err
}
_, _, errno := syscall.Syscall(syscall.SYS_SYMLINKAT, uintptr(unsafe.Pointer(targetPtr)), uintptr(dirfd), uintptr(unsafe.Pointer(linkpathPtr)))
if errno != 0 {
return errno
}
return nil
}
// Readlinkat is a direct pass-through to the readlinkat(2) system call.
func Readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
var zero uintptr
pathPtr, err := syscall.BytePtrFromString(path)
if err != nil {
return 0, err
}
var bufPtr unsafe.Pointer
if len(buf) > 0 {
bufPtr = unsafe.Pointer(&buf[0])
} else {
bufPtr = unsafe.Pointer(&zero)
}
r0, _, errno := syscall.Syscall6(syscall.SYS_READLINKAT, uintptr(dirfd), uintptr(unsafe.Pointer(pathPtr)), uintptr(bufPtr), uintptr(len(buf)), 0, 0)
n = int(r0)
if errno != 0 {
return 0, errno
}
return n, nil
}
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