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- #ifndef _SYS_SELECT_H
- #define _SYS_SELECT_H
- /* We don't define fd_set and friends if we are compiling POSIX
- source, or if we have included (or may include as indicated
- by __USE_W32_SOCKETS) the W32api winsock[2].h header which
- defines Windows versions of them. Note that a program which
- includes the W32api winsock[2].h header must know what it is doing;
- it must not call the Cygwin select function.
- */
- # if !(defined (_WINSOCK_H) || defined (_WINSOCKAPI_) || defined (__USE_W32_SOCKETS))
- #include <sys/cdefs.h>
- #include <sys/_sigset.h>
- #include <sys/_timeval.h>
- #include <sys/timespec.h>
- #if !defined(_SIGSET_T_DECLARED)
- #define _SIGSET_T_DECLARED
- typedef __sigset_t sigset_t;
- #endif
- # define _SYS_TYPES_FD_SET
- /*
- * Select uses bit masks of file descriptors in longs.
- * These macros manipulate such bit fields (the filesystem macros use chars).
- * FD_SETSIZE may be defined by the user, but the default here
- * should be enough for most uses.
- */
- #ifndef FD_SETSIZE
- # ifdef __CYGWIN__
- # define FD_SETSIZE 1024
- # elif defined(__rtems__)
- # define FD_SETSIZE 256
- # else
- # define FD_SETSIZE 64
- # endif
- #endif
- typedef unsigned long __fd_mask;
- #if __BSD_VISIBLE
- typedef __fd_mask fd_mask;
- #endif
- #define _NFDBITS ((int)sizeof(__fd_mask) * 8) /* bits per mask */
- #if __BSD_VISIBLE
- #define NFDBITS _NFDBITS
- #endif
- #ifndef _howmany
- #define _howmany(x,y) (((x) + ((y) - 1)) / (y))
- #endif
- typedef struct fd_set {
- __fd_mask __fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];
- } fd_set;
- #if __BSD_VISIBLE
- #define fds_bits __fds_bits
- #endif
- #define __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS))
- #define FD_CLR(n, p) ((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
- #if __BSD_VISIBLE
- #define FD_COPY(f, t) (void)(*(t) = *(f))
- #endif
- #define FD_ISSET(n, p) (((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n)) != 0)
- #define FD_SET(n, p) ((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
- #define FD_ZERO(p) do { \
- fd_set *_p; \
- __size_t _n; \
- \
- _p = (p); \
- _n = _howmany(FD_SETSIZE, _NFDBITS); \
- while (_n > 0) \
- _p->__fds_bits[--_n] = 0; \
- } while (0)
- #if !defined (__INSIDE_CYGWIN_NET__)
- __BEGIN_DECLS
- int select __P ((int __n, fd_set *__readfds, fd_set *__writefds,
- fd_set *__exceptfds, struct timeval *__timeout));
- #if __POSIX_VISIBLE >= 200112
- int pselect __P ((int __n, fd_set *__readfds, fd_set *__writefds,
- fd_set *__exceptfds, const struct timespec *__timeout,
- const sigset_t *__set));
- #endif
- __END_DECLS
- #endif /* !__INSIDE_CYGWIN_NET__ */
- #endif /* !(_WINSOCK_H || _WINSOCKAPI_ || __USE_W32_SOCKETS) */
- #endif /* sys/select.h */
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