[PATCH v6 3/6] linux ttyname: Change return type of is_pty from int to bool

[Florian Weimer]

* Luke Shumaker:

> --- a/sysdeps/unix/sysv/linux/ttyname.h
> +++ b/sysdeps/unix/sysv/linux/ttyname.h
> @@ -23,7 +23,7 @@
>  /* Return true if this is a UNIX98 pty device, as defined in
>     linux/Documentation/devices.txt (on linux < 4.10) or
>     linux/Documentation/admin-guide/devices.txt (on linux >= 4.10).  */
> -static inline int
> +static inline bool
>  is_pty (struct stat64 *sb)
>  {
>  #ifdef _STATBUF_ST_RDEV

The file does not include <stdbool.h>, so bool might not be available.
Either include it, or use _Bool.