104a7d4e00
There are number problems with the implementation of realtime signals in NuttX as discussed in Issue #8869. A first step to correcting any of these is to correct the definitions of SIGRTMIN, SIGRTMAX, and RTSIG_SIX. SIGRTMIN is the first real-time signals. Real-time signal numbers must not overlap the standard signal numbers. Before this fix, it was set equal to the first standard signal. Real-time signals differ from standard signals in that (1) they have no default actions, and (2) real time signal actions are prioritized whereas standard signal actions are processed FIFO. SIGRTMAX is the last real-time signal. RTSIG_MAX must be set equal to maximum number of realtime signals reserved for application use The change corrects the definitons but has not impact at all becasuse none of there definitions are currently used in the OS. But they will be when prioritized real time signal handling is implemented.
318 lines
9.4 KiB
C
318 lines
9.4 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 4
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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 Number of realtime signals reserved for application
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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 ULONG_MAX
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#define _POSIX_SIZE_MIN 0
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#define _POSIX_SSIZE_MAX LONG_MAX
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#define _POSIX_SSIZE_MIN LONG_MIN
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#endif /* CONFIG_SMALL_MEMORY */
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/* Required for sigqueue */
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#define _POSIX_RTSIG_MAX 2 /* Number of reserved realtime signals */
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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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#if CONFIG_LIBC_OPEN_MAX < _POSIX_OPEN_MAX
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# define OPEN_MAX _POSIX_OPEN_MAX
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#else
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# define OPEN_MAX CONFIG_LIBC_OPEN_MAX
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#endif
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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: 100
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*/
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#define NZERO SCHED_PRIORITY_DEFAULT
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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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/* ptrdiff_t limits */
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#define PTRDIFF_MAX PTR_MAX
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#define PTRDIFF_MIN PTR_MIN
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#endif /* __INCLUDE_LIMITS_H */
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