213 lines
7.5 KiB
C
213 lines
7.5 KiB
C
/********************************************************************************
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* include/limits.h
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*
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* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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/* 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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#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 CONFIG_NFILE_DESCRIPTORS
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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_SSIZE_MAX INT_MAX
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#define _POSIX_STREAM_MAX CONFIG_NFILE_STREAMS
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#define _POSIX_TZNAME_MAX 3
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/* Requred 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 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 nanoseconds.
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* CLOCK_REALTIME is controlled by the NuttX system time. The default value is the
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* system timer which has a resolution of 10 milliseconds. This default setting can
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* be overridden by defining the clock interval in milliseconds as CONFIG_MSEC_PER_TICK
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* in the board 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_MSEC_PER_TICK
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# define _POSIX_CLOCKRES_MIN ((CONFIG_MSEC_PER_TICK)*1000000)
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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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/* Actual 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 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 SSIZE_MAX _POSIX_SSIZE_MAX
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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 RTSIG_MAX _POSIX_RTSIG_MAX
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#define SIGQUEUE_MAX _POSIX_SIGQUEUE_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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/* 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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#endif /* __INCLUDE_LIMITS_H */
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