* sysdeps/unix/bsd/bsd4.4/isatty.c: New file.

	* sysdeps/unix/bsd/isatty.c (__isatty): Don't save and restore errno.
	* sysdeps/unix/bsd/ptsname.c (__ptsname_r): Return errno value from
	isatty unmodified.  Reported by Bruno Haible <bruno@clisp.org>.

3 files changed, 10 insertions, 16 deletions

diff --git a/sysdeps/unix/bsd/bsd4.4/isatty.c b/sysdeps/unix/bsd/bsd4.4/isatty.c
new file mode 100644
index 0000000000..473368c93f
--- /dev/null
+++ b/sysdeps/unix/bsd/bsd4.4/isatty.c
@@ -0,0 +1,3 @@
+/* In a 4.4-derived world, tcgetattr is just one ioctl.  */
+
+#include <sysdeps/posix/isatty.c>
diff --git a/sysdeps/unix/bsd/isatty.c b/sysdeps/unix/bsd/isatty.c
index bd61ed62dc..996c4ed41f 100644
--- a/sysdeps/unix/bsd/isatty.c
+++ b/sysdeps/unix/bsd/isatty.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1995, 1996, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1991,95,96,97,2002 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -25,15 +25,8 @@ int
 __isatty (fd)
      int fd;
 {
-  int save;
-  int is_tty;
   struct sgttyb term;
 
-  save = errno;
-  is_tty = __ioctl (fd, TIOCGETP, &term) == 0;
-  __set_errno (save);
-
-  return is_tty;
+  return __ioctl (fd, TIOCGETP, &term) == 0;
 }
-
 weak_alias (__isatty, isatty)
diff --git a/sysdeps/unix/bsd/ptsname.c b/sysdeps/unix/bsd/ptsname.c
index cd7c42fa33..fd446a4b66 100644
--- a/sysdeps/unix/bsd/ptsname.c
+++ b/sysdeps/unix/bsd/ptsname.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1998 Free Software Foundation, Inc.
+/* Copyright (C) 1998,2002 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -53,22 +53,20 @@ __ptsname_r (int fd, char *buf, size_t buflen)
     }
 
   if (!__isatty (fd))
-    {
-      __set_errno (ENOTTY);
-      return ENOTTY;
-    }
+    /* We rely on isatty to set errno properly (i.e. EBADF or ENOTTY).  */
+    return errno;
 
   if (buflen < strlen (_PATH_TTY) + 3)
     {
       __set_errno (ERANGE);
       return ERANGE;
     }
-  
+
   if (__ttyname_r (fd, buf, buflen) != 0)
     return errno;
 
   buf[sizeof (_PATH_DEV) - 1] = 't';
-  
+
   if (__stat (buf, &st) < 0)
     return errno;