From 0da663e05c93f2791d7166ece8d69a1be06a7924 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Wed, 25 Aug 2021 14:49:58 +0200
Subject: implement open() for FD_SPECIAL_TTY (`/tty`)

---
 src/kernel/syscalls.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

(limited to 'src/kernel/syscalls.c')

diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c
index 737484d..1c0a687 100644
--- a/src/kernel/syscalls.c
+++ b/src/kernel/syscalls.c
@@ -70,9 +70,17 @@ fd_t _syscall_fs_open(const user_ptr path, int len) {
 	struct virt_iter iter;
 	struct vfs_mount *mount = process_current->mount;
 	static char buffer[PATH_MAX]; // holds the path
+	int fd, res;
 
 	if (len > PATH_MAX) return -1;
 
+	// find the first free fd
+	for (fd = 0; fd < FD_MAX; fd++) {
+		if (process_current->fds[fd].type == FD_EMPTY)
+			break;
+	}
+	if (fd == FD_MAX) return -1;
+
 	// copy the path to the kernel
 	virt_iter_new(&iter, path, len, process_current->pages, true, false);
 	while (virt_iter_next(&iter))
@@ -90,14 +98,28 @@ fd_t _syscall_fs_open(const user_ptr path, int len) {
 			break;
 	}
 
-	tty_write(buffer, len);
+	tty_write(buffer + mount->prefix_len, len - mount->prefix_len);
 	tty_const(" from mount ");
 	if (mount)
 		tty_write(mount->prefix, mount->prefix_len);
 	else
 		tty_const("[none]");
 
-	return -1;
+	if (!mount) return -1;
+
+	res = fdop_dispatch((struct fdop_args){
+			.type = FDOP_OPEN,
+			.fd = &mount->fd,
+			.open = {
+				.target = &process_current->fds[fd],
+				.path   = &buffer[mount->prefix_len],
+				.len    = len - mount->prefix_len,
+			}
+		});
+	if (res < 0)
+		return res;
+	else
+		return fd;
 }
 
 int _syscall_fd_mount(fd_t fd, const user_ptr path, int len) {
-- 
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