From 5f6767972f1550c54dd6f28267dc3d882f67d7ed Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sun, 1 May 2022 20:21:55 +0200
Subject: kernel/proc: `process_handle_get` for safely accepting handle ids

---
 src/kernel/proc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

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

diff --git a/src/kernel/proc.c b/src/kernel/proc.c
index 79c4ed7..39f9e1f 100644
--- a/src/kernel/proc.c
+++ b/src/kernel/proc.c
@@ -208,6 +208,15 @@ handle_t process_find_handle(struct process *proc, handle_t start_at) {
 	return handle;
 }
 
+struct handle*
+process_handle_get(struct process *p, handle_t id, enum handle_type type) {
+	struct handle *h;
+	if (id < 0 || id >= HANDLE_MAX) return NULL;
+	h = p->handles[id];
+	if (h == NULL || h->type != type) return NULL;
+	return h;
+}
+
 void process_transition(struct process *p, enum process_state state) {
 	enum process_state last = p->state;
 	p->state = state;
-- 
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