Added msging

2 files changed, 59 insertions, 0 deletions

diff --git a/libgui/inc/msg.h b/libgui/inc/msg.h
new file mode 100644
index 0000000..e120b70
--- /dev/null
+++ b/libgui/inc/msg.h
@@ -0,0 +1,34 @@
+// MIT License, Copyright (c) 2021 Marvin Borner
+
+#ifndef MSG_H
+#define MSG_H
+
+#include <def.h>
+
+#define MSG_MAGIC 0x42042069
+
+struct message {
+	u32 magic;
+	int src;
+	int type;
+	void *data;
+};
+
+enum message_type {
+	// GFX
+	GFX_NEW_CONTEXT,
+	GFX_REDRAW,
+	GFX_REDRAW_FOCUSED,
+
+	// GUI
+	GUI_KILL,
+	GUI_KEYBOARD,
+	GUI_MOUSE,
+	GUI_RESIZE,
+	GUI_MAX
+};
+
+int msg_send(u32 pid, enum message_type, void *data);
+int msg_receive(struct message *msg);
+
+#endif
diff --git a/libgui/msg.c b/libgui/msg.c
new file mode 100644
index 0000000..6898121
--- /dev/null
+++ b/libgui/msg.c
@@ -0,0 +1,25 @@
+// MIT License, Copyright (c) 2021 Marvin Borner
+
+#include <assert.h>
+#include <msg.h>
+#include <print.h>
+#include <sys.h>
+
+int msg_send(u32 pid, enum message_type type, void *data)
+{
+	assert((signed)pid != -1);
+	char path[32] = { 0 };
+	sprintf(path, "/proc/%d/msg", pid);
+	struct message msg = { .magic = MSG_MAGIC, .src = getpid(), .type = type, .data = data };
+	return write(path, &msg, 0, sizeof(msg));
+}
+
+int msg_receive(struct message *msg)
+{
+	int ret = read("/proc/self/msg", msg, 0, sizeof(*msg));
+	assert(msg->magic == MSG_MAGIC);
+	if (msg->magic == MSG_MAGIC && ret == sizeof(*msg))
+		return ret;
+	else
+		return -1;
+}