ptsname: Fix misuse of ttyname_r.

[gnulib.git] / lib / ptsname.c

diff --git a/lib/ptsname.c b/lib/ptsname.c
index a62ef21..3c7a9e0 100644 (file)
--- a/lib/ptsname.c
+++ b/lib/ptsname.c
@@ -63,6 +63,7 @@ static int
 __ptsname_r (int fd, char *buf, size_t buflen)
 {
   int save_errno = errno;
+  int err;
   struct stat st;
 
   if (buf == NULL)
@@ -81,8 +82,12 @@ __ptsname_r (int fd, char *buf, size_t buflen)
       return ERANGE;
     }
 
-  if (__ttyname_r (fd, buf, buflen) != 0)
-    return errno;
+  err = __ttyname_r (fd, buf, buflen);
+  if (err != 0)
+    {
+      __set_errno (err);
+      return errno;
+    }
 
   buf[sizeof (_PATH_DEV) - 1] = 't';