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- #ifndef _SYS_SELECT_H
- # error "Never use <bits/select.h> directly; include <sys/select.h> instead."
- #endif
- #ifdef __GNUC__
- #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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