hare

commit a51a24853d5c04f976f36a4494d05029dd900866
parent d6c950e614241eee903f3ce11afefe2fb59f5756
Author: Drew DeVault <sir@cmpwn.com>
Date:   Thu, 11 Feb 2021 17:43:42 -0500

os: add must_fdstream

Diffstat:
M
os/+linux/fdstream.ha
 | 
8
++++++++

1 file changed, 8 insertions(+), 0 deletions(-)
diff --git a/os/+linux/fdstream.ha b/os/+linux/fdstream.ha
@@ -55,6 +55,14 @@ export fn streamfd(s: *io::stream) (int | void) = {
 	return stream.fd;
 };
 
+// Returns the file descriptor for a given [io::stream]. If there is no fd
+// associated with this stream, abort.
+export fn must_streamfd(s: *io::stream) int = {
+	assert(is_fdstream(s));
+	let stream = s: *fd_stream;
+	return stream.fd;
+};
+
 fn fd_read(s: *io::stream, buf: []u8) (size | io::EOF | io::error) = {
 	let stream = s: *fd_stream;
 	return match (rt::read(stream.fd, buf: *[*]u8, len(buf))) {