From 493159b9bb1a764926daa49fb09bff8f29e8e9e5 Mon Sep 17 00:00:00 2001
From: Mole Shang <135e2@135e2.dev>
Date: Thu, 18 Jan 2024 17:35:27 +0800
Subject: lab syscall: finish

---
 kernel/proc.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'kernel/proc.c')

diff --git a/kernel/proc.c b/kernel/proc.c
index 58a8a0b..5aa616f 100644
--- a/kernel/proc.c
+++ b/kernel/proc.c
@@ -299,6 +299,9 @@ fork(void)
   // copy saved user registers.
   *(np->trapframe) = *(p->trapframe);
 
+  // inherit trace_mask
+  np->trace_mask = p->trace_mask;
+
   // Cause fork to return 0 in the child.
   np->trapframe->a0 = 0;
 
@@ -686,3 +689,20 @@ procdump(void)
     printf("\n");
   }
 }
+
+int
+get_nproc(void)
+{
+  int n = 0;
+  struct proc *p;
+
+  for(int i = 0; i < NPROC; i++) {
+    p = &proc[i];
+    acquire(&p->lock);
+    if(p->state != UNUSED)
+      n++;
+    release(&p->lock);
+  }
+
+  return n;
+}
-- 
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