2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1992, 1993
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34 #ifndef _SYS_SELECT_H_
35 #define _SYS_SELECT_H_
37 #include <sys/cdefs.h>
38 #include <sys/_types.h>
40 #include <sys/_sigset.h>
41 #include <sys/_timeval.h>
42 #include <sys/timespec.h>
44 typedef unsigned long __fd_mask;
46 typedef __fd_mask fd_mask;
49 #ifndef _SIGSET_T_DECLARED
50 #define _SIGSET_T_DECLARED
51 typedef __sigset_t sigset_t;
55 * Select uses bit masks of file descriptors in longs. These macros
56 * manipulate such bit fields (the filesystem macros use chars).
57 * FD_SETSIZE may be defined by the user, but the default here should
58 * be enough for most uses.
61 #define FD_SETSIZE 1024
64 #define _NFDBITS (sizeof(__fd_mask) * 8) /* bits per mask */
66 #define NFDBITS _NFDBITS
70 #define _howmany(x, y) (((x) + ((y) - 1)) / (y))
73 typedef struct fd_set {
74 __fd_mask __fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];
77 #define fds_bits __fds_bits
80 #define __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS))
81 #define FD_CLR(n, p) ((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
83 #define FD_COPY(f, t) (void)(*(t) = *(f))
85 #define FD_ISSET(n, p) (((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n)) != 0)
86 #define FD_SET(n, p) ((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
87 #define FD_ZERO(p) do { \
92 _n = _howmany(FD_SETSIZE, _NFDBITS); \
94 _p->__fds_bits[--_n] = 0; \
100 int pselect(int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict,
101 const struct timespec *__restrict, const sigset_t *__restrict);
102 #ifndef _SELECT_DECLARED
103 #define _SELECT_DECLARED
104 /* XXX missing restrict type-qualifier */
105 int select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
108 #endif /* !_KERNEL */
110 #endif /* _SYS_SELECT_H_ */