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Diffstat (limited to 'sysdeps/unix/sysv/linux/ttyname_r.c')
-rw-r--r--sysdeps/unix/sysv/linux/ttyname_r.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/ttyname_r.c b/sysdeps/unix/sysv/linux/ttyname_r.c
index b92c712fcc..9a0ce4cea9 100644
--- a/sysdeps/unix/sysv/linux/ttyname_r.c
+++ b/sysdeps/unix/sysv/linux/ttyname_r.c
@@ -134,7 +134,10 @@ __ttyname_r (fd, buf, buflen)
 
   ret = __readlink (procname, buf, buflen - 1);
   if (ret != -1 && buf[0] != '[')
-    return 0;
+    {
+      buf[ret] = '\0';
+      return 0;
+    }
   if (ret == -1 && errno == ENAMETOOLONG)
     {
       __set_errno (ERANGE);