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