From 9e61bc0571b4812381cf89dd6f4bcbe3931f6acd Mon Sep 17 00:00:00 2001
From: rpj <rpj>
Date: Fri, 22 Dec 2006 02:36:40 +0000
Subject: ''

---
 sem_getvalue.c | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'sem_getvalue.c')

diff --git a/sem_getvalue.c b/sem_getvalue.c
index ae13ef9..baafb02 100644
--- a/sem_getvalue.c
+++ b/sem_getvalue.c
@@ -90,6 +90,15 @@ sem_getvalue (sem_t * sem, int *sval)
 
       if ((result = pthread_mutex_lock(&s->lock)) == 0)
         {
+	  /* See sem_destroy.c
+	   */
+	  if (*sem == NULL)
+	    {
+	      (void) pthread_mutex_unlock (&s->lock);
+	      errno = EINVAL;
+	      return -1;
+	    }
+
           value = s->value;
           (void) pthread_mutex_unlock(&s->lock);
           *sval = value;
-- 
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