ptsname test: Extend test.

[gnulib.git] / tests / test-ptsname.c

diff --git a/tests/test-ptsname.c b/tests/test-ptsname.c
index 06c78ea..d27e7d6 100644 (file)
--- a/tests/test-ptsname.c
+++ b/tests/test-ptsname.c
@@ -21,6 +21,7 @@
 #include "signature.h"
 SIGNATURE_CHECK (ptsname, char *, (int));
 
+#include <errno.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <stdio.h>
@@ -63,6 +64,17 @@ main (void)
 #endif
 
   {
+    char *result;
+
+    errno = 0;
+    result = ptsname (-1);
+    ASSERT (result == NULL);
+    ASSERT (errno == EBADF
+            || errno == ENOTTY /* seen on glibc */
+           );
+  }
+
+  {
     int fd;
     char *result;