1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T     */
  28 /*        All Rights Reserved   */
  29 
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39 
  40 #ifndef _SYS_SELECT_H
  41 #define _SYS_SELECT_H
  42 
  43 #include <sys/feature_tests.h>
  44 
  45 #ifndef _KERNEL
  46 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
  47 #include <sys/time_impl.h>
  48 #endif
  49 #include <sys/time.h>
  50 #endif /* _KERNEL */
  51 
  52 #ifdef  __cplusplus
  53 extern "C" {
  54 #endif
  55 
  56 
  57 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
  58 /*
  59  * The sigset_t type is defined in <sys/signal.h> and duplicated
  60  * in <sys/ucontext.h> as a result of XPG4v2 requirements. XPG6
  61  * now allows the visibility of signal.h in this header, however
  62  * an order of inclusion problem occurs as a result of inclusion
  63  * of <sys/select.h> in <signal.h> under certain conditions.
  64  * Rather than include <sys/signal.h> here, we've duplicated
  65  * the sigset_t type instead. This type is required for the XPG6
  66  * introduced pselect() function also declared in this header.
  67  */
  68 #ifndef _SIGSET_T
  69 #define _SIGSET_T
  70 typedef struct {                /* signal set type */
  71         unsigned int    __sigbits[4];
  72 } sigset_t;
  73 #endif  /* _SIGSET_T */
  74 
  75 #endif /* #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) ... */
  76 
  77 /*
  78  * Select uses bit masks of file descriptors in longs.
  79  * These macros manipulate such bit fields.
  80  * FD_SETSIZE may be defined by the user, but the default here
  81  * should be >= RLIM_FD_MAX.
  82  */
  83 #ifndef FD_SETSIZE
  84 #define FD_SETSIZE      65536
  85 #endif  /* FD_SETSIZE */
  86 
  87 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
  88 typedef long    fd_mask;
  89 #endif
  90 typedef long    fds_mask;
  91 
  92 /*
  93  *  The value of _NBBY needs to be consistant with the value
  94  *  of NBBY in <sys/param.h>.
  95  */
  96 #define _NBBY 8
  97 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
  98 #ifndef NBBY            /* number of bits per byte */
  99 #define NBBY _NBBY
 100 #endif
 101 #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
 102 
 103 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
 104 #define NFDBITS         (sizeof (fd_mask) * NBBY)       /* bits per mask */
 105 #endif
 106 #define FD_NFDBITS      (sizeof (fds_mask) * _NBBY)     /* bits per mask */
 107 
 108 #define __howmany(__x, __y)     (((__x)+((__y)-1))/(__y))
 109 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
 110 #ifndef howmany
 111 #define howmany(x, y)   (((x)+((y)-1))/(y))
 112 #endif
 113 #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
 114 
 115 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
 116 typedef struct fd_set {
 117 #else
 118 typedef struct __fd_set {
 119 #endif
 120         long    fds_bits[__howmany(FD_SETSIZE, FD_NFDBITS)];
 121 } fd_set;
 122 
 123 #define FD_SET(__n, __p)        ((__p)->fds_bits[(__n)/FD_NFDBITS] |= \
 124                                     (1ul << ((__n) % FD_NFDBITS)))
 125 
 126 #define FD_CLR(__n, __p)        ((__p)->fds_bits[(__n)/FD_NFDBITS] &= \
 127                                     ~(1ul << ((__n) % FD_NFDBITS)))
 128 
 129 #define FD_ISSET(__n, __p)      (((__p)->fds_bits[(__n)/FD_NFDBITS] & \
 130                                     (1ul << ((__n) % FD_NFDBITS))) != 0l)
 131 
 132 #ifdef _KERNEL
 133 #define FD_ZERO(p)      bzero((p), sizeof (*(p)))
 134 #else
 135 #define FD_ZERO(__p)    (void) memset((__p), 0, sizeof (*(__p)))
 136 #endif /* _KERNEL */
 137 
 138 #ifndef _KERNEL
 139 #ifdef  __STDC__
 140 extern int select(int, fd_set *_RESTRICT_KYWD, fd_set *_RESTRICT_KYWD,
 141         fd_set *_RESTRICT_KYWD, struct timeval *_RESTRICT_KYWD);
 142 
 143 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
 144 extern int pselect(int, fd_set *_RESTRICT_KYWD, fd_set *_RESTRICT_KYWD,
 145         fd_set *_RESTRICT_KYWD, const struct timespec *_RESTRICT_KYWD,
 146         const sigset_t *_RESTRICT_KYWD);
 147 #endif
 148 
 149 #else
 150 extern int select();
 151 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
 152 extern int pselect();
 153 #endif
 154 #endif  /* __STDC__ */
 155 #endif  /* _KERNEL */
 156 
 157 #ifdef  __cplusplus
 158 }
 159 #endif
 160 
 161 #endif  /* _SYS_SELECT_H */