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// SPDX-License-Identifier: MPL-2.0
// (c) Hare authors <https://harelang.org>
use errors;
use io;
use rt;
// Flags to use for the [[io::file]]s returned by [[pipe]].
// Only NOCLOEXEC and NONBLOCK are guaranteed to be available.
export type pipe_flag = enum {
NOCLOEXEC = rt::O_CLOEXEC,
NONBLOCK = rt::O_NONBLOCK,
};
// Create a pair of two linked [[io::file]]s, such that any data written to the
// second [[io::file]] may be read from the first.
export fn pipe(flags: pipe_flag = 0) ((io::file, io::file) | errors::error) = {
let fds: [2]int = [0...];
flags ^= pipe_flag::NOCLOEXEC; // invert CLOEXEC
match (rt::pipe2(&fds, flags)) {
case void => void;
case let e: rt::errno =>
return errors::errno(e);
};
return (fds[0], fds[1]);
};
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