1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef _SYS_SELECT_H_ 33 #define _SYS_SELECT_H_ 34 35 #include <sys/cdefs.h> 36 #include <sys/_types.h> 37 38 #include <sys/_sigset.h> 39 #include <sys/_timeval.h> 40 #include <sys/timespec.h> 41 42 typedef unsigned long __fd_mask; 43 #if __BSD_VISIBLE 44 typedef __fd_mask fd_mask; 45 #endif 46 47 #ifndef _SIGSET_T_DECLARED 48 #define _SIGSET_T_DECLARED 49 typedef __sigset_t sigset_t; 50 #endif 51 52 #if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 53 #include <ssp/ssp.h> 54 #else 55 #define __SSP_FORTIFY_LEVEL 0 56 #endif 57 58 /* 59 * Select uses bit masks of file descriptors in longs. These macros 60 * manipulate such bit fields (the filesystem macros use chars). 61 * FD_SETSIZE may be defined by the user, but the default here should 62 * be enough for most uses. 63 */ 64 #ifndef FD_SETSIZE 65 #define FD_SETSIZE 1024 66 #endif 67 68 #define _NFDBITS (sizeof(__fd_mask) * 8) /* bits per mask */ 69 #if __BSD_VISIBLE 70 #define NFDBITS _NFDBITS 71 #endif 72 73 #ifndef _howmany 74 #define _howmany(x, y) (((x) + ((y) - 1)) / (y)) 75 #endif 76 77 typedef struct fd_set { 78 __fd_mask __fds_bits[_howmany(FD_SETSIZE, _NFDBITS)]; 79 } fd_set; 80 #if __BSD_VISIBLE 81 #define fds_bits __fds_bits 82 #endif 83 84 #define __fdset_idx_(p, n) ((n) / _NFDBITS) 85 #if __SSP_FORTIFY_LEVEL == 0 86 #define __fdset_idx(p, n) __fdset_idx_(p, n) 87 #else 88 __ssp_inline unsigned long 89 __fdset_idx(const fd_set *p, unsigned long idx) 90 { 91 __size_t psz = __ssp_bos0(p); 92 unsigned long sidx = __fdset_idx_(p, idx); 93 94 if (idx >= FD_SETSIZE) 95 __chk_fail(); 96 if (psz / sizeof(__fd_mask) < (sidx + 1)) 97 __chk_fail(); 98 99 return (sidx); 100 } 101 #endif 102 103 #define __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS)) 104 #define FD_CLR(n, p) ((p)->__fds_bits[__fdset_idx(p, n)] &= ~__fdset_mask(n)) 105 #if __BSD_VISIBLE 106 #define FD_COPY(f, t) (void)(*(t) = *(f)) 107 #endif 108 #define FD_ISSET(n, p) \ 109 (((p)->__fds_bits[__fdset_idx(p, n)] & __fdset_mask(n)) != 0) 110 #define FD_SET(n, p) ((p)->__fds_bits[__fdset_idx(p, n)] |= __fdset_mask(n)) 111 #define FD_ZERO(p) do { \ 112 fd_set *_p; \ 113 __size_t _n; \ 114 \ 115 _p = (p); \ 116 _n = _howmany(FD_SETSIZE, _NFDBITS); \ 117 while (_n > 0) \ 118 _p->__fds_bits[--_n] = 0; \ 119 } while (0) 120 121 #ifndef _KERNEL 122 123 __BEGIN_DECLS 124 int pselect(int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict, 125 const struct timespec *__restrict, const sigset_t *__restrict); 126 #ifndef _SELECT_DECLARED 127 #define _SELECT_DECLARED 128 /* XXX missing restrict type-qualifier */ 129 int select(int, fd_set *, fd_set *, fd_set *, struct timeval *); 130 #endif 131 __END_DECLS 132 #endif /* !_KERNEL */ 133 134 #endif /* _SYS_SELECT_H_ */ 135