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// Copyright 2018 The gVisor 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 linux
// Package memutil provides a wrapper for the memfd_create() system call.
package memutil
import (
"fmt"
"unsafe"
"golang.org/x/sys/unix"
)
// CreateMemFD creates a memfd file and returns the fd.
func CreateMemFD(name string, flags int) (int, error) {
p, err := unix.BytePtrFromString(name)
if err != nil {
return -1, err
}
fd, _, e := unix.Syscall(unix.SYS_MEMFD_CREATE, uintptr(unsafe.Pointer(p)), uintptr(flags), 0)
if e != 0 {
if e == unix.ENOSYS {
return -1, fmt.Errorf("memfd_create(2) is not implemented. Check that you have Linux 3.17 or higher")
}
return -1, e
}
return int(fd), nil
}
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