implement open() for FD_SPECIAL_TTY (`/tty`)

1 files changed, 7 insertions, 0 deletions

diff --git a/src/kernel/fd.h b/src/kernel/fd.h
index bcc9902..c7c5182 100644
--- a/src/kernel/fd.h
+++ b/src/kernel/fd.h
@@ -18,6 +18,8 @@ struct fd {
 
 enum fdop { // describes the operations which can be done on file descriptors
 	FDOP_MOUNT, // also closes the original fd
+	FDOP_OPEN,  // when the file descriptor is mounted, open a file relative to it
+
 	FDOP_READ,
 	FDOP_WRITE,
 	FDOP_CLOSE,
@@ -30,6 +32,11 @@ struct fdop_args {
 		struct { // FDOP_MOUNT
 			struct mount *target;
 		} mnt;
+		struct { // FDOP_OPEN
+			struct fd *target;
+			const char *path; // relative to the mount point
+			size_t len;
+		} open;
 		struct { // FDOP_READ, FDOP_WRITE
 			user_ptr ptr;
 			size_t len;