309 lines
9.2 KiB
C
309 lines
9.2 KiB
C
/********************************************************************************
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* include/limits.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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********************************************************************************/
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#ifndef __INCLUDE_LIMITS_H
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#define __INCLUDE_LIMITS_H
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/********************************************************************************
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* Included Files
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********************************************************************************/
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#include <nuttx/config.h>
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/* Architecture specific limits */
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#include <arch/limits.h>
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/********************************************************************************
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* Pre-processor Definitions
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********************************************************************************/
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/* Default values for user configurable limits **********************************/
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/* Maximum number of bytes in a filename (not including terminating null). */
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#ifndef CONFIG_NAME_MAX
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# define CONFIG_NAME_MAX 32
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#endif
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/* Maximum number of bytes in a pathname, including the terminating null
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* character.
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*/
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#ifndef CONFIG_PATH_MAX
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# if CONFIG_NAME_MAX < 64
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# define CONFIG_PATH_MAX (4*CONFIG_NAME_MAX + 1)
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# else
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# define CONFIG_PATH_MAX 256
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# endif
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#endif
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/* Maximum length of any multibyte character in any locale.
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* We define this value here since the gcc header does not define
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* the correct value.
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*/
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#define MB_LEN_MAX 1
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/* Configurable limits required by POSIX ****************************************
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*
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* Required for all implementations:
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*
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* _POSIX_ARG_MAX Total length of string arguments
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* _POSIX_CHILD_MAX Number of child tasks active
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* _POSIX_LINK_MAX The number of links a file can have
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* _POSIX_MAX_CANON Number bytes in TTY canonical input queue
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* _POSIX_MAX_INPUT Number bytes in TTY canonical input queue
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* _POSIX_NAME_MAX Number of bytes in a file or pathname component
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* _POSIX_NGROUPS_MAX Number supplementary group IDs
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* _POSIX_OPEN_MAX Number of files a task can have open at once
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* _POSIX_PATH_MAX Number of bytes in a full pathname (including NULL)
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* _POSIX_PIPE_BUF Number of bytes for atomic write into pipe
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* _POSIX_SSIZE_MAX Largest filesystem write; also max value of ssize_t
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* _POSIX_STREAM_MAX Number of std I/O streams open at once
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* _POSIX_TZNAME_MAX Max number of bytes of a timezone name
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*
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* Required for sigqueue
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*
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* _POSIX_RTSIG_MAX Difference between SIGRTMIN and SIGRTMAX
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* _POSIX_SIGQUEUE_MAX Max number signals a task can queue
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*
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* Required for POSIX timers
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*
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* _POSIX_DELAYTIMER_MAX Max number timer overruns
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* _POSIX_TIMER_MAX Max number of timers per task
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* _POSIX_CLOCKRES_MIN Clock resolution in nanoseconds
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*
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* Required for asynchronous I/O
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*
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* _POSIX_AIO_LISTIO_MAX Max number of AIOs in single listio call
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* _POSIX_AIO_MAX Max number of simultaneous AIO operations
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*
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* Required for POSIX message passing
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*
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* _POSIX_MQ_OPEN_MAX Max number message queues task may open (mq_open)
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* _POSIX_MQ_PRIO_MAX Max message priority (mq_send)
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*
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* Required for POSIX semaphores
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*
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* _POSIX_SEM_NSEMS_MAX Max number of open semaphores per task
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* _POSIX_SEM_VALUE_MAX Max value a semaphore may have
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*
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* Required for symbolic links
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* _POSIX_SYMLOOP_MAX Maximum number of symbolic links that can be
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* reliably traversed in the resolution of a pathname
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* in the absence of a loop.
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*
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*/
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#define _POSIX_ARG_MAX 4096
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#define _POSIX_CHILD_MAX 6
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#define _POSIX_LINK_MAX 8
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#define _POSIX_MAX_CANON 255
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#define _POSIX_MAX_INPUT 255
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#define _POSIX_NAME_MAX CONFIG_NAME_MAX
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#define _POSIX_NGROUPS_MAX 0
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#define _POSIX_OPEN_MAX 16
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#define _POSIX_PATH_MAX CONFIG_PATH_MAX
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#define _POSIX_PIPE_BUF 512
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#define _POSIX_STREAM_MAX 16
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#define _POSIX_TZNAME_MAX 3
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#ifdef CONFIG_SMALL_MEMORY
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#define _POSIX_SIZE_MAX 65535 /* See sys/types.h */
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#define _POSIX_SIZE_MIN 0
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#define _POSIX_SSIZE_MAX 32767 /* See sys/types.h */
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#define _POSIX_SSIZE_MIN -32768
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#else /* CONFIG_SMALL_MEMORY */
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#define _POSIX_SIZE_MAX 4294967295UL /* See sys/types.h */
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#define _POSIX_SIZE_MIN 0
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#define _POSIX_SSIZE_MAX 2147483647L /* See sys/types.h */
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#define _POSIX_SSIZE_MIN -2147483648L
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#endif /* CONFIG_SMALL_MEMORY */
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/* Required for sigqueue */
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#define _POSIX_RTSIG_MAX 31
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#define _POSIX_SIGQUEUE_MAX 32
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/* Required for symbolic links */
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#define _POSIX_SYMLOOP_MAX 8
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/* Required for POSIX timers.
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*
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* _POSIX_DELAYTIMER_MAX is the number of timer expiration overruns.
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*
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* _POSIX_TIMER_MAX is the per-process number of timers.
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*
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* _POSIX_CLOCKRES_MIN is the resolution of the CLOCK_REALTIME clock in
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* nanoseconds. CLOCK_REALTIME is controlled by the NuttX system time.
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* The default value is the system timer which has a resolution of 1000
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* microseconds. This default setting can be overridden by defining the
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* clock interval in microseconds as CONFIG_USEC_PER_TICK in the NuttX
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* configuration file.
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*/
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#define _POSIX_DELAYTIMER_MAX 32
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#define _POSIX_TIMER_MAX 32
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#ifdef CONFIG_USEC_PER_TICK
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# define _POSIX_CLOCKRES_MIN ((CONFIG_USEC_PER_TICK)*1000)
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#else
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# define _POSIX_CLOCKRES_MIN (10*1000000)
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#endif
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/* Required for asynchronous I/O */
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#define _POSIX_AIO_LISTIO_MAX 2
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#define _POSIX_AIO_MAX 1
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/* Required for POSIX message passing */
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#define _POSIX_MQ_OPEN_MAX 8
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#define _POSIX_MQ_PRIO_MAX UCHAR_MAX
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/* Required for POSIX semaphores */
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#define _POSIX_SEM_NSEMS_MAX INT_MAX
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#define _POSIX_SEM_VALUE_MAX 0x7fff
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/* Numerical limits. These values may be increased from the POSIX minimum
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* values above or made indeterminate
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*/
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#define ARG_MAX _POSIX_ARG_MAX
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#define CHILD_MAX _POSIX_CHILD_MAX
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#define LINK_MAX _POSIX_LINK_MAX
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#define MAX_CANON _POSIX_MAX_CANON
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#define MAX_INPUT _POSIX_MAX_INPUT
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#define NAME_MAX _POSIX_NAME_MAX
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#define TTY_NAME_MAX _POSIX_NAME_MAX
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#define NGROUPS_MAX _POSIX_NGROUPS_MAX
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#define OPEN_MAX _POSIX_OPEN_MAX
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#define PATH_MAX _POSIX_PATH_MAX
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#define PIPE_BUF _POSIX_PIPE_BUF
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#define SIZE_MAX _POSIX_SIZE_MAX
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#define SIZE_MIN _POSIX_SIZE_MIN
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#define RSIZE_MAX _POSIX_SIZE_MAX
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#define SSIZE_MAX _POSIX_SSIZE_MAX
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#define SSIZE_MIN _POSIX_SSIZE_MIN
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#define STREAM_MAX _POSIX_STREAM_MAX
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#define TZNAME_MAX _POSIX_TZNAME_MAX
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#define TZ_MAX_TIMES CONFIG_LIBC_TZ_MAX_TIMES
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#define TZ_MAX_TYPES CONFIG_LIBC_TZ_MAX_TYPES
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#define RTSIG_MAX _POSIX_RTSIG_MAX
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#define SIGQUEUE_MAX _POSIX_SIGQUEUE_MAX
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#define SYMLOOP_MAX _POSIX_SYMLOOP_MAX
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#define DELAYTIMER_MAX _POSIX_DELAYTIMER_MAX
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#define TIMER_MAX _POSIX_TIMER_MAX
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#define CLOCKRES_MIN _POSIX_CLOCKRES_MIN
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/* Other invariant values */
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/* CHARCLASS_NAME_MAX
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* Maximum number of bytes in a character class name. Minimum Acceptable
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* Value: 14
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*/
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#define CHARCLASS_NAME_MAX 14
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/* Maximum value of digit in calls to the printf() and scanf() functions.
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* Minimum Acceptable Value: 9
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*/
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#ifdef CONFIG_LIBC_NUMBERED_ARGS
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# ifdef CONFIG_LIBC_NL_ARGMAX
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# define NL_ARGMAX CONFIG_LIBC_NL_ARGMAX
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# else
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# define NL_ARGMAX 9
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# endif
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#endif
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/* NL_LANGMAX
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* Maximum number of bytes in a LANG name. Minimum Acceptable Value: 14
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*/
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#define NL_LANGMAX 14
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/* NL_MSGMAX
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* Maximum message number. Minimum Acceptable Value: 32 67
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*/
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#define NL_MSGMAX 32767
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/* NL_NMAX
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* Maximum number of bytes in an N-to-1 collation mapping. Minimum
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* Acceptable Value: *
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*/
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/* NL_SETMAX
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* Maximum set number. Minimum Acceptable Value: 255
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*/
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#define NL_SETMAX 255
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/* NL_TEXTMAX
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* Maximum number of bytes in a message string. Minimum Acceptable Value:
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* _POSIX2_LINE_MAX
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*/
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#define NL_TEXTMAX _POSIX2_LINE_MAX
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/* NZERO
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* Default process priority. Minimum Acceptable Value: 128
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*/
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#define NZERO 128
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/* Required for asynchronous I/O */
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#define AIO_LISTIO_MAX _POSIX_AIO_LISTIO_MAX
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#define AIO_MAX _POSIX_AIO_MAX
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/* Required for POSIX message passing */
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#define MQ_OPEN_MAX _POSIX_MQ_OPEN_MAX
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#define MQ_PRIO_MAX _POSIX_MQ_PRIO_MAX
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/* Required for POSIX semaphores */
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#define SEM_NSEMS_MAX _POSIX_SEM_NSEMS_MAX
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#define SEM_VALUE_MAX _POSIX_SEM_VALUE_MAX
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/* Required for readv() and writev() */
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/* There really is no upper limit on the number of vectors */
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#define IOV_MAX INT_MAX
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#define HOST_NAME_MAX 32
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#endif /* __INCLUDE_LIMITS_H */
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