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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14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
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36 #ifndef _SYS_SELECT_H_
37 #define _SYS_SELECT_H_
39 #include <sys/cdefs.h>
40 #include <sys/_types.h>
42 #include <sys/_sigset.h>
43 #include <sys/_timeval.h>
44 #include <sys/timespec.h>
46 typedef unsigned long __fd_mask;
48 typedef __fd_mask fd_mask;
51 #ifndef _SIGSET_T_DECLARED
52 #define _SIGSET_T_DECLARED
53 typedef __sigset_t sigset_t;
57 * Select uses bit masks of file descriptors in longs. These macros
58 * manipulate such bit fields (the filesystem macros use chars).
59 * FD_SETSIZE may be defined by the user, but the default here should
60 * be enough for most uses.
63 #define FD_SETSIZE 1024U
66 #define _NFDBITS (sizeof(__fd_mask) * 8) /* bits per mask */
68 #define NFDBITS _NFDBITS
72 #define _howmany(x, y) (((x) + ((y) - 1)) / (y))
75 typedef struct fd_set {
76 __fd_mask __fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];
79 #define fds_bits __fds_bits
82 #define __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS))
83 #define FD_CLR(n, p) ((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
85 #define FD_COPY(f, t) (void)(*(t) = *(f))
87 #define FD_ISSET(n, p) ((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n))
88 #define FD_SET(n, p) ((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
89 #define FD_ZERO(p) do { \
94 _n = _howmany(FD_SETSIZE, _NFDBITS); \
96 _p->__fds_bits[--_n] = 0; \
102 int pselect(int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict,
103 const struct timespec *__restrict, const sigset_t *__restrict);
104 #ifndef _SELECT_DECLARED
105 #define _SELECT_DECLARED
106 /* XXX missing restrict type-qualifier */
107 int select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
110 #endif /* !_KERNEL */
112 #endif /* _SYS_SELECT_H_ */