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+.\"	$NetBSD: memfd_create.2,v 1.3 2025/11/15 19:03:37 gutteridge Exp $
+.\"
+.\" Copyright (c) 2023 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Theodore Preduta.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd November 14, 2025
+.Dt MEMFD_CREATE 2
+.Os
+.Sh NAME
+.Nm memfd_create
+.Nd create anonymous files
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft int
+.Fn memfd_create "const char *name" "unsigned int flags"
+.Sh DESCRIPTION
+The
+.Fn memfd_create
+system call returns a file descriptor to a file named
+.Fa name
+backed only by RAM.
+Initially, the size of the file is zero.
+.Pp
+The length of
+.Fa name
+must not exceed
+.Dv NAME_MAX-6
+characters in length, to allow for the prefix
+.Dq memfd:
+to be added.
+But since the file descriptor does not live on disk,
+.Fa name
+does not have to be unique.
+.Fa name
+is only intended to be used for debugging purposes and commands like
+.Xr fstat 1 .
+.Pp
+Additionally, any of the following may be specified as the
+.Fa flags :
+.Bl -tag -width MFD_ALLOW_SEALING
+.It Dv MFD_CLOEXEC
+Set the
+.Xr close 2
+on
+.Xr exec 3
+flag.
+.It Dv MFD_CLOFORK
+Set the
+.Xr close 2
+on
+.Xr fork 2
+flag.
+.It Dv MFD_ALLOW_SEALING
+Allow adding seals to the file descriptor using the
+.Xr fcntl 2
+.Dv F_ADD_SEALS
+command.
+.El
+.Pp
+Otherwise, the returned file descriptor behaves the same as a regular file,
+including the ability to be mapped by
+.Xr mmap 2 .
+.Sh RETURN VALUES
+If successful, the
+.Fn memfd_create
+system call returns a non-negative integer.
+On failure -1 is returned and
+.Fa errno
+is set to indicate the error.
+.Sh ERRORS
+.Fn memfd_create
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The argument
+.Fa name
+is
+.Dv NULL
+or points to invalid memory.
+.It Bq Er EINVAL
+The argument
+.Fa flags
+has any bits set other than
+.Dv MFD_CLOEXEC ,
+.Dv MFD_CLOFORK ,
+or
+.Dv MFD_ALLOW_SEALING .
+.It Bq Er ENAMETOOLONG
+The length of
+.Fa name
+appended with the prefix
+.Dq memfd:
+would exceed
+.Dv NAME_MAX .
+.It Bq Er ENFILE
+The system file table is full.
+.El
+.Sh SEE ALSO
+.Xr fcntl 2 ,
+.Xr mmap 2 ,
+.Xr shmget 2 ,
+.Xr shm_open 3
+.Sh HISTORY
+.Fn memfd_create
+is compatible with the Linux system call of the same name that first appeared in
+Linux 3.17.
+It was added in
+.Nx 11.0 .