syscall/write: WRITE_TRUNCATE

2 files changed, 3 insertions, 1 deletions

diff --git a/src/kernel/arch/amd64/driver/fsroot.c b/src/kernel/arch/amd64/driver/fsroot.c
index c4c3de4..2feaf67 100644
--- a/src/kernel/arch/amd64/driver/fsroot.c
+++ b/src/kernel/arch/amd64/driver/fsroot.c
@@ -94,6 +94,8 @@ static int handle(struct vfs_request *req) {
 			switch (id) {
 				case HANDLE_VGA: {
 					void *vga = (void*)0xB8000;
+					if (req->flags)
+						return -1;
 					fs_normslice(&req->offset, &req->input.len, 80*25*2, false);
 					if (!virt_cpy_from(req->caller->pages, vga + req->offset,
 							req->input.buf, req->input.len))
diff --git a/src/kernel/arch/amd64/driver/serial.c b/src/kernel/arch/amd64/driver/serial.c
index 6dda657..93202c2 100644
--- a/src/kernel/arch/amd64/driver/serial.c
+++ b/src/kernel/arch/amd64/driver/serial.c
@@ -93,7 +93,7 @@ static void accept(struct vfs_request *req) {
 			}
 			break;
 		case VFSOP_WRITE:
-			if (req->caller) {
+			if (req->caller && !req->flags) {
 				struct virt_iter iter;
 				virt_iter_new(&iter, req->input.buf, req->input.len,
 						req->caller->pages, true, false);