From 206ca77636cca94d14d7486a7a0e2679bf107a28 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Thu, 16 Sep 2021 06:33:26 +0000
Subject: fs_read stub, basic implementation in userland

---
 src/kernel/syscalls.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

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

diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c
index 48e67db..d39aed9 100644
--- a/src/kernel/syscalls.c
+++ b/src/kernel/syscalls.c
@@ -135,9 +135,20 @@ fail:
 	return -1;
 }
 
-int _syscall_read(handle_t handle, char __user *buf, int len) {
-	if (handle < 0 || handle >= HANDLE_MAX) return -1;
-	return -1;
+int _syscall_read(handle_t handle_num, char __user *buf, int len) {
+	struct handle *handle = &process_current->handles[handle_num];
+	if (handle_num < 0 || handle_num >= HANDLE_MAX) return -1;
+	if (handle->type != HANDLE_FILE) return -1;
+	return vfs_request_create((struct vfs_request) {
+			.type = VFSOP_READ,
+			.output = {
+				.buf = (userptr_t) buf,
+				.len = len,
+			},
+			.id = handle->file.id,
+			.caller = process_current,
+			.backend = handle->file.backend,
+		});
 }
 
 int _syscall_write(handle_t handle_num, const char __user *buf, int len) {
-- 
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