newlib/libc/reent/isattyr.c

   1 /* Reentrant versions of isatty system call.  */
   2
   3 #include <reent.h>
   4 #include <unistd.h>
   5 #include <_syslist.h>
   6
   7 /* Some targets provides their own versions of these functions.  Those
   8    targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS.  */
   9
  10 #ifdef _REENT_ONLY
  11 #ifndef REENTRANT_SYSCALLS_PROVIDED
  12 #define REENTRANT_SYSCALLS_PROVIDED
  13 #endif
  14 #endif
  15
  16 #ifdef REENTRANT_SYSCALLS_PROVIDED
  17
  18 int _dummy_isatty_syscalls = 1;
  19
  20 #else
  21
  22 /* We use the errno variable used by the system dependent layer.  */
  23 #undef errno
  24 extern int errno;
  25
  26 /*
  27 FUNCTION
  28         <<_isatty_r>>---Reentrant version of isatty
  29
  30 INDEX
  31         _isatty_r
  32
  33 SYNOPSIS
  34         #include <reent.h>
  35         int _isatty_r(struct _reent *<[ptr]>,
  36                      int <[fd]>);
  37
  38 DESCRIPTION
  39         This is a reentrant version of <<isatty>>.  It
  40         takes a pointer to the global data block, which holds
  41         <<errno>>.
  42 */
  43
  44 int
  45 _isatty_r (ptr, fd)
  46      struct _reent *ptr;
  47      int fd;
  48 {
  49   int ret;
  50
  51   errno = 0;
  52   if ((ret = _isatty (fd)) == -1 && errno != 0)
  53     _REENT_ERRNO(ptr) = errno;
  54   return ret;
  55 }
  56
  57 #endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */