newlib/libc/posix/_isatty.c

   1 /* isatty.c */
   2
   3 /* Dumb implementation so programs will at least run.  */
   4
   5 #include <sys/stat.h>
   6 #include <errno.h>
   7
   8 int
   9 _isatty (int fd)
  10 {
  11   struct stat buf;
  12
  13   if (fstat (fd, &buf) < 0) {
  14     errno = EBADF;
  15     return 0;
  16   }
  17   if (S_ISCHR (buf.st_mode))
  18     return 1;
  19   errno = ENOTTY;
  20   return 0;
  21 }