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