usr/src/uts/common/sys/select.h

   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 >= NOFILE (param.h).
  82  */
  83 #ifndef FD_SETSIZE
  84 #ifdef _LP64
  85 #define FD_SETSIZE      65536
  86 #else
  87 #define FD_SETSIZE      1024
  88 #endif  /* _LP64 */
  89 #elif FD_SETSIZE > 1024 && !defined(_LP64)
  90 #ifdef __PRAGMA_REDEFINE_EXTNAME
  91 #pragma redefine_extname        select  select_large_fdset
  92 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
  93 #pragma redefine_extname        pselect pselect_large_fdset
  94 #endif
  95 #else   /* __PRAGMA_REDEFINE_EXTNAME */
  96 #define select  select_large_fdset
  97 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
  98 #define pselect pselect_large_fdset
  99 #endif
 100 #endif  /* __PRAGMA_REDEFINE_EXTNAME */
 101 #endif  /* FD_SETSIZE */
 102
 103 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
 104 typedef long    fd_mask;
 105 #endif
 106 typedef long    fds_mask;
 107
 108 /*
 109  *  The value of _NBBY needs to be consistant with the value
 110  *  of NBBY in <sys/param.h>.
 111  */
 112 #define _NBBY 8
 113 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
 114 #ifndef NBBY            /* number of bits per byte */
 115 #define NBBY _NBBY
 116 #endif
 117 #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
 118
 119 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
 120 #define NFDBITS         (sizeof (fd_mask) * NBBY)       /* bits per mask */
 121 #endif
 122 #define FD_NFDBITS      (sizeof (fds_mask) * _NBBY)     /* bits per mask */
 123
 124 #define __howmany(__x, __y)     (((__x)+((__y)-1))/(__y))
 125 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
 126 #ifndef howmany
 127 #define howmany(x, y)   (((x)+((y)-1))/(y))
 128 #endif
 129 #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
 130
 131 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
 132 typedef struct fd_set {
 133 #else
 134 typedef struct __fd_set {
 135 #endif
 136         long    fds_bits[__howmany(FD_SETSIZE, FD_NFDBITS)];
 137 } fd_set;
 138
 139 #define FD_SET(__n, __p)        ((__p)->fds_bits[(__n)/FD_NFDBITS] |= \
 140                                     (1ul << ((__n) % FD_NFDBITS)))
 141
 142 #define FD_CLR(__n, __p)        ((__p)->fds_bits[(__n)/FD_NFDBITS] &= \
 143                                     ~(1ul << ((__n) % FD_NFDBITS)))
 144
 145 #define FD_ISSET(__n, __p)      (((__p)->fds_bits[(__n)/FD_NFDBITS] & \
 146                                     (1ul << ((__n) % FD_NFDBITS))) != 0l)
 147
 148 #ifdef _KERNEL
 149 #define FD_ZERO(p)      bzero((p), sizeof (*(p)))
 150 #else
 151 #define FD_ZERO(__p)    (void) memset((__p), 0, sizeof (*(__p)))
 152 #endif /* _KERNEL */
 153
 154 #ifndef _KERNEL
 155 #ifdef  __STDC__
 156 extern int select(int, fd_set *_RESTRICT_KYWD, fd_set *_RESTRICT_KYWD,
 157         fd_set *_RESTRICT_KYWD, struct timeval *_RESTRICT_KYWD);
 158
 159 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
 160 extern int pselect(int, fd_set *_RESTRICT_KYWD, fd_set *_RESTRICT_KYWD,
 161         fd_set *_RESTRICT_KYWD, const struct timespec *_RESTRICT_KYWD,
 162         const sigset_t *_RESTRICT_KYWD);
 163 #endif
 164
 165 #else
 166 extern int select();
 167 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
 168 extern int pselect();
 169 #endif
 170 #endif  /* __STDC__ */
 171 #endif  /* _KERNEL */
 172
 173 #ifdef  __cplusplus
 174 }
 175 #endif
 176
 177 #endif  /* _SYS_SELECT_H */