date and time created 89/05/17 22:49:21 by bostic

[unix-history] / usr / src / lib / libc / gen / isatty.c

diff --git a/usr/src/lib/libc/gen/isatty.c b/usr/src/lib/libc/gen/isatty.c
index 715e883..fc7c121 100644 (file)
--- a/usr/src/lib/libc/gen/isatty.c
+++ b/usr/src/lib/libc/gen/isatty.c
@@ -1,15 +1,30 @@
-/* @(#)isatty.c        4.2 (Berkeley) %G% */

 /*
 /*

- * Returns 1 iff file is a tty
+ * Copyright (c) 1988 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

  */
 
  */
 

+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)isatty.c   5.3 (Berkeley) %G%";
+#endif /* LIBC_SCCS and not lint */
+

 #include <sgtty.h>
 
 #include <sgtty.h>
 

-isatty(f)
+isatty(fd)
+       int fd;

 {
        struct sgttyb ttyb;
 
 {
        struct sgttyb ttyb;
 

-       if (ioctl(f, TIOCGETP, &ttyb) < 0)
-               return(0);
-       return(1);
+       return(ioctl(fd, TIOCGETP, &ttyb) >= 0);

 }
 }