[mirror_edk2.git] / StdLib / Include / sys / fd_set.h

/*  $NetBSD: fd_set.h,v 1.2 2005/12/11 12:25:20 christos Exp $  */\r
\r
/*-\r
 * Copyright (c) 1992, 1993\r
 *  The Regents of the University of California.  All rights reserved.\r
 *\r
 * Redistribution and use in source and binary forms, with or without\r
 * modification, are permitted provided that the following conditions\r
 * are met:\r
 * 1. Redistributions of source code must retain the above copyright\r
 *    notice, this list of conditions and the following disclaimer.\r
 * 2. Redistributions in binary form must reproduce the above copyright\r
 *    notice, this list of conditions and the following disclaimer in the\r
 *    documentation and/or other materials provided with the distribution.\r
 * 3. Neither the name of the University nor the names of its contributors\r
 *    may be used to endorse or promote products derived from this software\r
 *    without specific prior written permission.\r
 *\r
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r
 * SUCH DAMAGE.\r
 *\r
 *  from: @(#)types.h 8.4 (Berkeley) 1/21/94\r
 */\r
\r
#ifndef _SYS_FD_SET_H_\r
#define _SYS_FD_SET_H_\r
\r
#include  <sys/EfiCdefs.h>\r
#include  <machine/int_types.h>\r
\r
/*\r
 * Implementation dependent defines, hidden from user space. X/Open does not\r
 * specify them.\r
 */\r
#define __NBBY    8   /* number of bits in a byte */\r
typedef __int32_t __fd_mask;\r
\r
/* bits per mask */\r
#define __NFDBITS ((unsigned int)sizeof(__fd_mask) * __NBBY)\r
\r
#define __howmany(x, y) (((x) + ((y) - 1)) / (y))\r
\r
/*\r
 * Select uses bit masks of file descriptors in longs.  These macros\r
 * manipulate such bit fields (the filesystem macros use chars).\r
 * FD_SETSIZE may be defined by the user, but the default here should\r
 * be enough for most uses.\r
 */\r
#ifndef FD_SETSIZE\r
#define FD_SETSIZE  256\r
#endif\r
\r
typedef struct fd_set {\r
  __fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];\r
} fd_set;\r
\r
#define FD_SET(n, p)  \\r
    ((p)->fds_bits[(n)/__NFDBITS] |= (1 << ((n) % __NFDBITS)))\r
#define FD_CLR(n, p)  \\r
    ((p)->fds_bits[(n)/__NFDBITS] &= ~(1 << ((n) % __NFDBITS)))\r
#define FD_ISSET(n, p)  \\r
    ((p)->fds_bits[(n)/__NFDBITS] & (1 << ((n) % __NFDBITS)))\r
#if __GNUC_PREREQ__(2, 95)\r
#define FD_ZERO(p)  (void)__builtin_memset((p), 0, sizeof(*(p)))\r
#else\r
#define FD_ZERO(p)  do {            \\r
  fd_set *__fds = (p);            \\r
  unsigned int __i;           \\r
  for (__i = 0; __i < __howmany(FD_SETSIZE, __NFDBITS); __i++)  \\r
    __fds->fds_bits[__i] = 0;       \\r
  } while (/* CONSTCOND */ 0)\r
#endif /* GCC 2.95 */\r
\r
/*\r
 * Expose our internals if we are not required to hide them.\r
 */\r
#if defined(_NETBSD_SOURCE)\r
\r
#define fd_mask __fd_mask\r
#define NFDBITS __NFDBITS\r
#ifndef howmany\r
#define howmany(a, b) __howmany(a, b)\r
#endif\r
\r
#if __GNUC_PREREQ__(2, 95)\r
#define FD_COPY(f, t) (void)__builtin_memcpy((t), (f), sizeof(*(f)))\r
#else\r
#define FD_COPY(f, t) do {            \\r
  fd_set *__f = (f), *__t = (t);          \\r
  unsigned int __i;           \\r
  for (__i = 0; __i < __howmany(FD_SETSIZE, __NFDBITS); __i++)  \\r
    __t->fds_bits[__i] = __f->fds_bits[__i];    \\r
  } while (/* CONSTCOND */ 0)\r
#endif /* GCC 2.95 */\r
\r
#endif /* _NETBSD_SOURCE */\r
\r
#endif /* _SYS_FD_SET_H_ */\r
Commit	Line	Data
2aa62f2b	1	/* $NetBSD: fd_set.h,v 1.2 2005/12/11 12:25:20 christos Exp $ */\r
	2	\r
	3	/*-\r
	4	* Copyright (c) 1992, 1993\r
	5	* The Regents of the University of California. All rights reserved.\r
	6	*\r
	7	* Redistribution and use in source and binary forms, with or without\r
	8	* modification, are permitted provided that the following conditions\r
	9	* are met:\r
	10	* 1. Redistributions of source code must retain the above copyright\r
	11	* notice, this list of conditions and the following disclaimer.\r
	12	* 2. Redistributions in binary form must reproduce the above copyright\r
	13	* notice, this list of conditions and the following disclaimer in the\r
	14	* documentation and/or other materials provided with the distribution.\r
	15	* 3. Neither the name of the University nor the names of its contributors\r
	16	* may be used to endorse or promote products derived from this software\r
	17	* without specific prior written permission.\r
	18	*\r
	19	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r
	20	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
	21	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
	22	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r
	23	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r
	24	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
	25	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
	26	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
	27	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r
	28	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r
	29	* SUCH DAMAGE.\r
	30	*\r
	31	* from: @(#)types.h 8.4 (Berkeley) 1/21/94\r
	32	*/\r
	33	\r
	34	#ifndef _SYS_FD_SET_H_\r
	35	#define _SYS_FD_SET_H_\r
	36	\r
	37	#include <sys/EfiCdefs.h>\r
	38	#include <machine/int_types.h>\r
	39	\r
	40	/*\r
	41	* Implementation dependent defines, hidden from user space. X/Open does not\r
	42	* specify them.\r
	43	*/\r
	44	#define __NBBY 8 /* number of bits in a byte */\r
	45	typedef __int32_t __fd_mask;\r
	46	\r
	47	/* bits per mask */\r
	48	#define __NFDBITS ((unsigned int)sizeof(__fd_mask) * __NBBY)\r
	49	\r
	50	#define __howmany(x, y) (((x) + ((y) - 1)) / (y))\r
	51	\r
	52	/*\r
	53	* Select uses bit masks of file descriptors in longs. These macros\r
	54	* manipulate such bit fields (the filesystem macros use chars).\r
	55	* FD_SETSIZE may be defined by the user, but the default here should\r
	56	* be enough for most uses.\r
	57	*/\r
	58	#ifndef FD_SETSIZE\r
	59	#define FD_SETSIZE 256\r
	60	#endif\r
	61	\r
	62	typedef struct fd_set {\r
	63	__fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];\r
	64	} fd_set;\r
65	\r
66	#define FD_SET(n, p) \\r
67	((p)->fds_bits[(n)/__NFDBITS] \|= (1 << ((n) % __NFDBITS)))\r
68	#define FD_CLR(n, p) \\r
69	((p)->fds_bits[(n)/__NFDBITS] &= ~(1 << ((n) % __NFDBITS)))\r
70	#define FD_ISSET(n, p) \\r
71	((p)->fds_bits[(n)/__NFDBITS] & (1 << ((n) % __NFDBITS)))\r
72	#if __GNUC_PREREQ__(2, 95)\r
73	#define FD_ZERO(p) (void)__builtin_memset((p), 0, sizeof(*(p)))\r
74	#else\r
75	#define FD_ZERO(p) do { \\r
76	fd_set *__fds = (p); \\r
77	unsigned int __i; \\r
78	for (__i = 0; __i < __howmany(FD_SETSIZE, __NFDBITS); __i++) \\r
79	__fds->fds_bits[__i] = 0; \\r
80	} while (/* CONSTCOND */ 0)\r
81	#endif /* GCC 2.95 */\r
82	\r
83	/*\r
84	* Expose our internals if we are not required to hide them.\r
85	*/\r
86	#if defined(_NETBSD_SOURCE)\r
87	\r
88	#define fd_mask __fd_mask\r
89	#define NFDBITS __NFDBITS\r
90	#ifndef howmany\r
91	#define howmany(a, b) __howmany(a, b)\r
92	#endif\r
93	\r
94	#if __GNUC_PREREQ__(2, 95)\r
95	#define FD_COPY(f, t) (void)__builtin_memcpy((t), (f), sizeof(*(f)))\r
96	#else\r
97	#define FD_COPY(f, t) do { \\r
98	fd_set __f = (f), __t = (t); \\r
99	unsigned int __i; \\r
100	for (__i = 0; __i < __howmany(FD_SETSIZE, __NFDBITS); __i++) \\r
101	__t->fds_bits[__i] = __f->fds_bits[__i]; \\r
102	} while (/* CONSTCOND */ 0)\r
103	#endif /* GCC 2.95 */\r
104	\r
105	#endif /* _NETBSD_SOURCE */\r
106	\r
107	#endif /* _SYS_FD_SET_H_ */\r