2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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32 #ifndef _SYS_SELECT_H_
33 #define _SYS_SELECT_H_
35 #include <sys/cdefs.h>
36 #include <sys/_types.h>
38 #include <sys/_sigset.h>
39 #include <sys/_timeval.h>
40 #include <sys/timespec.h>
42 typedef unsigned long __fd_mask;
44 typedef __fd_mask fd_mask;
47 #ifndef _SIGSET_T_DECLARED
48 #define _SIGSET_T_DECLARED
49 typedef __sigset_t sigset_t;
53 * Select uses bit masks of file descriptors in longs. These macros
54 * manipulate such bit fields (the filesystem macros use chars).
55 * FD_SETSIZE may be defined by the user, but the default here should
56 * be enough for most uses.
59 #define FD_SETSIZE 1024U
62 #define _NFDBITS (sizeof(__fd_mask) * 8) /* bits per mask */
64 #define NFDBITS _NFDBITS
68 #define _howmany(x, y) (((x) + ((y) - 1)) / (y))
71 typedef struct fd_set {
72 __fd_mask __fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];
75 #define fds_bits __fds_bits
78 #define __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS))
79 #define FD_CLR(n, p) ((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
81 #define FD_COPY(f, t) (void)(*(t) = *(f))
83 #define FD_ISSET(n, p) (((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n)) != 0)
84 #define FD_SET(n, p) ((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
85 #define FD_ZERO(p) do { \
90 _n = _howmany(FD_SETSIZE, _NFDBITS); \
92 _p->__fds_bits[--_n] = 0; \
98 int pselect(int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict,
99 const struct timespec *__restrict, const sigset_t *__restrict);
100 #ifndef _SELECT_DECLARED
101 #define _SELECT_DECLARED
102 /* XXX missing restrict type-qualifier */
103 int select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
106 #endif /* !_KERNEL */
108 #endif /* _SYS_SELECT_H_ */