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/*
* include/bits/select.h -- fd_set operations
*
* Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au>
* Copyright (C) 2001 NEC Corporation
* Copyright (C) 2001 Miles Bader <miles@gnu.org>
* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License. See the file COPYING.LIB in the main
* directory of this archive for more details.
*/
#ifndef _SYS_SELECT_H
# error "Never use <bits/select.h> directly; include <sys/select.h> instead."
#endif
#ifdef __GNUC__
/* We don't use `memset' because this would require a prototype and
the array isn't too big. */
#define __FD_ZERO(s) \
do { \
unsigned int __i; \
fd_set *__arr = (s); \
for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i) \
__FDS_BITS (__arr)[__i] = 0; \
} while (0)
#define __FD_SET(fd, s) \
do { \
int __fd = (fd); \
unsigned int *__addr = (unsigned int *)&__FDS_BITS (s); \
*__addr |= (1 << __fd); \
} while (0)
#define __FD_CLR(fd, s) \
do { \
int __fd = (fd); \
unsigned int *__addr = (unsigned int *)&__FDS_BITS (s); \
*__addr &= ~(1 << __fd); \
} while (0)
#define __FD_ISSET(fd, s) \
({ \
int __fd = (fd); \
unsigned int *__addr = (unsigned int *)&__FDS_BITS (s); \
int res; \
res = (*__addr & (1 << fd)) ? 1 : 0; \
})
#else /* !__GNUC__ */
#define __FD_SET(d, s) (__FDS_BITS (s)[__FDELT(d)] |= __FDMASK(d))
#define __FD_CLR(d, s) (__FDS_BITS (s)[__FDELT(d)] &= ~__FDMASK(d))
#define __FD_ISSET(d, s) ((__FDS_BITS (s)[__FDELT(d)] & __FDMASK(d)) != 0)
#endif /* __GNUC__ */
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