Added basic shared memory support

This will be improved soon. It's very insecure right now.

3 files changed, 5 insertions, 0 deletions

diff --git a/libgui/gui.c b/libgui/gui.c
index bc8adb1..e4800bc 100644
--- a/libgui/gui.c
+++ b/libgui/gui.c
@@ -15,6 +15,7 @@ s32 gui_new_window(struct gui_window *win)
 	    msg.header.type == (GUI_NEW_WINDOW | MSG_SUCCESS)) {
 		win->id = msg.id;
 		win->ctx = msg.ctx;
+		win->ctx.fb = shaccess(msg.shid);
 		return win->id;
 	}
 	return -1;
diff --git a/libgui/inc/msg.h b/libgui/inc/msg.h
index 7cbfa2c..150c42d 100644
--- a/libgui/inc/msg.h
+++ b/libgui/inc/msg.h
@@ -20,6 +20,7 @@ struct message_header {
 struct message_new_window {
 	struct message_header header;
 	u32 id;
+	u32 shid;
 	struct context ctx;
 };
 
diff --git a/libgui/msg.c b/libgui/msg.c
index 3f58267..677ad52 100644
--- a/libgui/msg.c
+++ b/libgui/msg.c
@@ -1,12 +1,15 @@
 // MIT License, Copyright (c) 2021 Marvin Borner
 
 #include <assert.h>
+#include <errno.h>
 #include <msg.h>
 #include <print.h>
 #include <sys.h>
 
 int msg_send(u32 pid, enum message_type type, void *data, u32 size)
 {
+	if (!data)
+		return -EFAULT;
 	assert((signed)pid != -1 && size >= sizeof(struct message_header));
 	char path[32] = { 0 };
 	sprintf(path, "/proc/%d/msg", pid);