l4/pkg/uclibc/lib/contrib/uclibc/libc/sysdeps/linux/microblaze/bits/select.h

   1 /*
   2  * include/bits/select.h -- fd_set operations
   3  *
   4  *  Copyright (C) 2003  John Williams <jwilliams@itee.uq.edu.au>
   5  *  Copyright (C) 2001  NEC Corporation
   6  *  Copyright (C) 2001  Miles Bader <miles@gnu.org>
   7  *  Copyright (C) 1997, 1998 Free Software Foundation, Inc.
   8  *
   9  * This file is subject to the terms and conditions of the GNU Lesser
  10  * General Public License.  See the file COPYING.LIB in the main
  11  * directory of this archive for more details.
  12  */
  13
  14 #ifndef _SYS_SELECT_H
  15 # error "Never use <bits/select.h> directly; include <sys/select.h> instead."
  16 #endif
  17
  18 #ifdef __GNUC__
  19
  20 /* We don't use `memset' because this would require a prototype and
  21    the array isn't too big.  */
  22 #define __FD_ZERO(s)                                                          \
  23   do {                                                                        \
  24     unsigned int __i;                                                         \
  25     fd_set *__arr = (s);                                                      \
  26     for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i)          \
  27       __FDS_BITS (__arr)[__i] = 0;                                            \
  28   } while (0)
  29
  30 #define __FD_SET(fd, s)                                                       \
  31   do {                                                                        \
  32         int __fd = (fd);                                                      \
  33         unsigned int *__addr = (unsigned int *)&__FDS_BITS (s);               \
  34         *__addr |= (1 << __fd);                                               \
  35   } while (0)
  36
  37 #define __FD_CLR(fd, s)                                                       \
  38   do {                                                                        \
  39         int __fd = (fd);                                                      \
  40         unsigned int *__addr = (unsigned int *)&__FDS_BITS (s);               \
  41         *__addr &= ~(1 << __fd);                                              \
  42   } while (0)
  43
  44 #define __FD_ISSET(fd, s)                                                     \
  45   ({                                                                          \
  46         int __fd = (fd);                                                      \
  47         unsigned int *__addr = (unsigned int *)&__FDS_BITS (s);               \
  48         int res;                                                              \
  49         res = (*__addr & (1 << fd)) ? 1 : 0;                                  \
  50   })
  51
  52 #else /* !__GNUC__ */
  53
  54 #define __FD_SET(d, s)     (__FDS_BITS (s)[__FDELT(d)] |= __FDMASK(d))
  55 #define __FD_CLR(d, s)     (__FDS_BITS (s)[__FDELT(d)] &= ~__FDMASK(d))
  56 #define __FD_ISSET(d, s)   ((__FDS_BITS (s)[__FDELT(d)] & __FDMASK(d)) != 0)
  57
  58 #endif /* __GNUC__ */