hare

commit a0252a33a8ca8a006b1e09412c8eaaa1bd7005b1
parent e46ba1931727f2ebefa851733b23bc8a9e841d05
Author: Drew DeVault <sir@cmpwn.com>
Date:   Sun, 31 Jan 2021 14:14:51 -0500

os: add streamfd function

Diffstat:
M
os/+linux/fdstream.ha
 | 
10
++++++++++

1 file changed, 10 insertions(+), 0 deletions(-)
diff --git a/os/+linux/fdstream.ha b/os/+linux/fdstream.ha
@@ -65,3 +65,13 @@ fn static_fdopen(fd: int, name: str, stream: *fd_stream) void = {
 	};
 	stream.fd = fd;
 };
+
+// Returns the file descriptor for a given [io::stream]. If there is no fd
+// associated with this stream, void is returned.
+export fn streamfd(s: *io::stream) (int | void) = {
+	if (s.reader != &fd_read) {
+		return void;
+	};
+	let stream = s: *fd_stream;
+	return stream.fd;
+};