limits.h

微内核软实时操作系统

/*
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)limits.h	8.4 (Berkeley) 4/28/95
 */

#define	CHAR_BIT	8		/* number of bits in a char */
#define	MB_LEN_MAX	32		/* no multibyte characters */


#define	CLK_TCK		1000		/* ticks per second */

/*
 * According to ANSI (section 2.2.4.2), the values below must be usable by
 * #if preprocessing directives.  Additionally, the expression must have the
 * same type as would an expression that is an object of the corresponding
 * type converted according to the integral promotions.  The subtraction for
 * INT_MIN and LONG_MIN is so the value is not unsigned; 2147483648 is an
 * unsigned int for 32-bit two's complement ANSI compilers (section 3.1.3.2).
 * These numbers work for pcc as well.  The UINT_MAX and ULONG_MAX values
 * are written as hex so that GCC will be quiet about large integer constants.
 */
#define	SCHAR_MAX	127		/* min value for a signed char */
#define	SCHAR_MIN	(-128)		/* max value for a signed char */

#define	UCHAR_MAX	255		/* max value for an unsigned char */
#define	CHAR_MAX	127		/* max value for a char */
#define	CHAR_MIN	(-128)		/* min value for a char */

#define	USHRT_MAX	65535		/* max value for an unsigned short */
#define	SHRT_MAX	32767		/* max value for a short */
#define	SHRT_MIN	(-32768)	/* min value for a short */

#define	UINT_MAX	0xffffffff	/* max value for an unsigned int */
#define	INT_MAX		2147483647	/* max value for an int */
#define	INT_MIN		(-2147483647-1)	/* min value for an int */

#define	ULONG_MAX	0xffffffffL	/* max value for an unsigned long */
#define	LONG_MAX	2147483647L	/* max value for a long */
					/* min value for a long */
#define	LONG_MIN	(-2147483647L-1L)

#if !defined(_ANSI_SOURCE)
#define	SSIZE_MAX	INT_MAX		/* max value for a ssize_t */

#if !defined(_POSIX_SOURCE)
#define	SIZE_T_MAX	UINT_MAX	/* max value for a size_t */

/* GCC requires that quad constants be written as expressions. */
#define	UQUAD_MAX	((u_quad_t)0-1)	/* max value for a uquad_t */
					/* max value for a quad_t */
#define	QUAD_MAX	((quad_t)(UQUAD_MAX >> 1))
#define	QUAD_MIN	(-QUAD_MAX-1)	/* min value for a quad_t */

#endif /* !_POSIX_SOURCE */
#endif /* !_ANSI_SOURCE */


/*
 * User area and user stack size (PREX)
 */
#define USER_MAX	0x80000000
#define USTACK_SIZE	0x1000