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-rw-r--r--kernel/proc.c20
1 files changed, 20 insertions, 0 deletions
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;
+}