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// SPDX-License-Identifier: MPL-2.0
// (c) Hare authors <https://harelang.org>
use errors;
use io;
use rt;
// Flags for [[memfd]].
export type memfd_flag = enum uint {
NONE = 0,
// Unsets the close-on-exec flag when creating a memfd.
NOCLOEXEC = rt::MFD_CLOEXEC,
// Allows sealing operations on this file.
ALLOW_SEALING = rt::MFD_ALLOW_SEALING,
// Create the memfd with huge pages using hugetlbfs. Linux-only.
HUGETLB = rt::MFD_HUGETLB,
};
// Creates a new anonymous [[io::file]] backed by memory.
//
// The initial file size is zero. It can be written to normally, or the size can
// be set manually with [[io::trunc]].
//
// This function is available on Linux and FreeBSD.
export fn memfd(
name: str,
flags: memfd_flag = memfd_flag::NONE,
) (io::file | errors::error) = {
flags ^= memfd_flag::NOCLOEXEC;
match (rt::memfd_create(name, flags: uint)) {
case let i: int =>
return i: io::file;
case let err: rt::errno =>
return errors::errno(err);
};
};
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