From d95894085b0b0d9305561fde7510df262ea21102 Mon Sep 17 00:00:00 2001
From: Gleb Koval <gleb@koval.net>
Date: Fri, 8 Nov 2024 09:15:22 +0000
Subject: [PATCH] Implement syscall_exec via process_execute

---
 src/userprog/syscall.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
index 1dbe73b..03e0721 100644
--- a/src/userprog/syscall.c
+++ b/src/userprog/syscall.c
@@ -110,10 +110,14 @@ syscall_exit (int status)
 }
 
 static pid_t
-syscall_exec (const char *cmd_line UNUSED)
+syscall_exec (const char *cmd_line)
 {
-  //TODO
-  return 0;
+  /* To check the end we would need to traverse the null-terminate string,
+     which is equally unsafe as just leaving process_execute to do it. */
+  cmd_line = validate_user_pointer (cmd_line, 1);
+  if (cmd_line == NULL)
+    thread_exit ();
+  process_execute (cmd_line);
 }
 
 static int