321 lines
9.9 KiB
C
321 lines
9.9 KiB
C
/********************************************************************************
|
|
* include/limits.h
|
|
*
|
|
* Copyright (C) 2007-2009, 2014, 2019 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* 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 NuttX 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 COPYRIGHT HOLDERS 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
|
|
* COPYRIGHT OWNER 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.
|
|
*
|
|
********************************************************************************/
|
|
|
|
#ifndef __INCLUDE_LIMITS_H
|
|
#define __INCLUDE_LIMITS_H
|
|
|
|
/********************************************************************************
|
|
* Included Files
|
|
********************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
/* Architecture specific limits */
|
|
|
|
#include <arch/limits.h>
|
|
|
|
/********************************************************************************
|
|
* Pre-processor Definitions
|
|
********************************************************************************/
|
|
|
|
/* Default values for user configurable limits **********************************/
|
|
|
|
/* Maximum number of bytes in a filename (not including terminating null). */
|
|
|
|
#ifndef CONFIG_NAME_MAX
|
|
# define CONFIG_NAME_MAX 32
|
|
#endif
|
|
|
|
/* Maximum number of bytes in a pathname, including the terminating null
|
|
* character.
|
|
*/
|
|
|
|
#ifndef CONFIG_PATH_MAX
|
|
# if CONFIG_NAME_MAX < 64
|
|
# define CONFIG_PATH_MAX (4*CONFIG_NAME_MAX + 1)
|
|
# else
|
|
# define CONFIG_PATH_MAX 256
|
|
# endif
|
|
#endif
|
|
|
|
/* Maximum length of any multibyte character in any locale.
|
|
* We define this value here since the gcc header does not define
|
|
* the correct value.
|
|
*/
|
|
|
|
#define MB_LEN_MAX 1
|
|
|
|
/* Configurable limits required by POSIX ****************************************
|
|
*
|
|
* Required for all implementations:
|
|
*
|
|
* _POSIX_ARG_MAX Total length of string arguments
|
|
* _POSIX_CHILD_MAX Number of child tasks active
|
|
* _POSIX_LINK_MAX The number of links a file can have
|
|
* _POSIX_MAX_CANON Number bytes in TTY canonical input queue
|
|
* _POSIX_MAX_INPUT Number bytes in TTY canonical input queue
|
|
* _POSIX_NAME_MAX Number of bytes in a file or pathname component
|
|
* _POSIX_NGROUPS_MAX Number supplementary group IDs
|
|
* _POSIX_OPEN_MAX Number of files a task can have open at once
|
|
* _POSIX_PATH_MAX Number of bytes in a full pathname (including NULL)
|
|
* _POSIX_PIPE_BUF Number of bytes for atomic write into pipe
|
|
* _POSIX_SSIZE_MAX Largest filesystem write; also max value of ssize_t
|
|
* _POSIX_STREAM_MAX Number of std I/O streams open at once
|
|
* _POSIX_TZNAME_MAX Max number of bytes of a timezone name
|
|
*
|
|
* Required for sigqueue
|
|
*
|
|
* _POSIX_RTSIG_MAX Difference between SIGRTMIN and SIGRTMAX
|
|
* _POSIX_SIGQUEUE_MAX Max number signals a task can queue
|
|
*
|
|
* Required for POSIX timers
|
|
*
|
|
* _POSIX_DELAYTIMER_MAX Max number timer overruns
|
|
* _POSIX_TIMER_MAX Max number of timers per task
|
|
* _POSIX_CLOCKRES_MIN Clock resolution in nanoseconds
|
|
*
|
|
* Required for asynchronous I/O
|
|
*
|
|
* _POSIX_AIO_LISTIO_MAX Max number of AIOs in single listio call
|
|
* _POSIX_AIO_MAX Max number of simultaneous AIO operations
|
|
*
|
|
* Required for POSIX message passing
|
|
*
|
|
* _POSIX_MQ_OPEN_MAX Max number message queues task may open (mq_open)
|
|
* _POSIX_MQ_PRIO_MAX Max message priority (mq_send)
|
|
*
|
|
* Required for POSIX semaphores
|
|
*
|
|
* _POSIX_SEM_NSEMS_MAX Max number of open semaphores per task
|
|
* _POSIX_SEM_VALUE_MAX Max value a semaphore may have
|
|
*
|
|
* Required for symbolic links
|
|
* _POSIX_SYMLOOP_MAX Maximum number of symbolic links that can be
|
|
* reliably traversed in the resolution of a pathname
|
|
* in the absence of a loop.
|
|
*
|
|
*/
|
|
|
|
#define _POSIX_ARG_MAX 4096
|
|
#define _POSIX_CHILD_MAX 6
|
|
#define _POSIX_LINK_MAX 8
|
|
#define _POSIX_MAX_CANON 255
|
|
#define _POSIX_MAX_INPUT 255
|
|
#define _POSIX_NAME_MAX CONFIG_NAME_MAX
|
|
#define _POSIX_NGROUPS_MAX 0
|
|
#define _POSIX_OPEN_MAX CONFIG_NFILE_DESCRIPTORS
|
|
#define _POSIX_PATH_MAX CONFIG_PATH_MAX
|
|
#define _POSIX_PIPE_BUF 512
|
|
#define _POSIX_STREAM_MAX CONFIG_NFILE_DESCRIPTORS
|
|
#define _POSIX_TZNAME_MAX 3
|
|
|
|
#ifdef CONFIG_SMALL_MEMORY
|
|
|
|
#define _POSIX_SIZE_MAX 65535 /* See sys/types.h */
|
|
#define _POSIX_SIZE_MIN 0
|
|
|
|
#define _POSIX_SSIZE_MAX 32767 /* See sys/types.h */
|
|
#define _POSIX_SSIZE_MIN -32768
|
|
|
|
#else /* CONFIG_SMALL_MEMORY */
|
|
|
|
#define _POSIX_SIZE_MAX 4294967295UL /* See sys/types.h */
|
|
#define _POSIX_SIZE_MIN 0
|
|
|
|
#define _POSIX_SSIZE_MAX 2147483647L /* See sys/types.h */
|
|
#define _POSIX_SSIZE_MIN -2147483648L
|
|
|
|
#endif /* CONFIG_SMALL_MEMORY */
|
|
|
|
/* Required for sigqueue */
|
|
|
|
#define _POSIX_RTSIG_MAX 31
|
|
#define _POSIX_SIGQUEUE_MAX 32
|
|
|
|
/* Required for symbolic links */
|
|
|
|
#define _POSIX_SYMLOOP_MAX 8
|
|
|
|
/* Required for POSIX timers.
|
|
*
|
|
* _POSIX_DELAYTIMER_MAX is the number of timer expiration overruns.
|
|
*
|
|
* _POSIX_TIMER_MAX is the per-process number of timers.
|
|
*
|
|
* _POSIX_CLOCKRES_MIN is the resolution of the CLOCK_REALTIME clock in
|
|
* nanoseconds. CLOCK_REALTIME is controlled by the NuttX system time.
|
|
* The default value is the system timer which has a resolution of 1000
|
|
* microseconds. This default setting can be overridden by defining the
|
|
* clock interval in microseconds as CONFIG_USEC_PER_TICK in the NuttX
|
|
* configuration file.
|
|
*/
|
|
|
|
#define _POSIX_DELAYTIMER_MAX 32
|
|
#define _POSIX_TIMER_MAX 32
|
|
|
|
#ifdef CONFIG_USEC_PER_TICK
|
|
# define _POSIX_CLOCKRES_MIN ((CONFIG_USEC_PER_TICK)*1000)
|
|
#else
|
|
# define _POSIX_CLOCKRES_MIN (10*1000000)
|
|
#endif
|
|
|
|
/* Required for asynchronous I/O */
|
|
|
|
#define _POSIX_AIO_LISTIO_MAX 2
|
|
#define _POSIX_AIO_MAX 1
|
|
|
|
/* Required for POSIX message passing */
|
|
|
|
#define _POSIX_MQ_OPEN_MAX 8
|
|
#define _POSIX_MQ_PRIO_MAX UCHAR_MAX
|
|
|
|
/* Required for POSIX semaphores */
|
|
|
|
#define _POSIX_SEM_NSEMS_MAX INT_MAX
|
|
#define _POSIX_SEM_VALUE_MAX 0x7fff
|
|
|
|
/* Numerical limits. These values may be increased from the POSIX minimum
|
|
* values above or made indeterminate
|
|
*/
|
|
|
|
#define ARG_MAX _POSIX_ARG_MAX
|
|
#define CHILD_MAX _POSIX_CHILD_MAX
|
|
#define LINK_MAX _POSIX_LINK_MAX
|
|
#define MAX_CANON _POSIX_MAX_CANON
|
|
#define MAX_INPUT _POSIX_MAX_INPUT
|
|
#define NAME_MAX _POSIX_NAME_MAX
|
|
#define NGROUPS_MAX _POSIX_NGROUPS_MAX
|
|
#define OPEN_MAX _POSIX_OPEN_MAX
|
|
#define PATH_MAX _POSIX_PATH_MAX
|
|
#define PIPE_BUF _POSIX_PIPE_BUF
|
|
#define SIZE_MAX _POSIX_SIZE_MAX
|
|
#define SIZE_MIN _POSIX_SIZE_MIN
|
|
#define RSIZE_MAX _POSIX_SIZE_MAX
|
|
#define SSIZE_MAX _POSIX_SSIZE_MAX
|
|
#define SSIZE_MIN _POSIX_SSIZE_MIN
|
|
#define STREAM_MAX _POSIX_STREAM_MAX
|
|
#define TZNAME_MAX _POSIX_TZNAME_MAX
|
|
#define TZ_MAX_TIMES CONFIG_LIBC_TZ_MAX_TIMES
|
|
#define TZ_MAX_TYPES CONFIG_LIBC_TZ_MAX_TYPES
|
|
|
|
#define RTSIG_MAX _POSIX_RTSIG_MAX
|
|
#define SIGQUEUE_MAX _POSIX_SIGQUEUE_MAX
|
|
|
|
#define SYMLOOP_MAX _POSIX_SYMLOOP_MAX
|
|
|
|
#define DELAYTIMER_MAX _POSIX_DELAYTIMER_MAX
|
|
#define TIMER_MAX _POSIX_TIMER_MAX
|
|
#define CLOCKRES_MIN _POSIX_CLOCKRES_MIN
|
|
|
|
/* Other invariant values */
|
|
|
|
/* CHARCLASS_NAME_MAX
|
|
* Maximum number of bytes in a character class name. Minimum Acceptable
|
|
* Value: 14
|
|
*/
|
|
|
|
#define CHARCLASS_NAME_MAX 14
|
|
|
|
/* Maximum value of digit in calls to the printf() and scanf() functions.
|
|
* Minimum Acceptable Value: 9
|
|
*/
|
|
|
|
#ifdef CONFIG_LIBC_NUMBERED_ARGS
|
|
# ifdef CONFIG_LIBC_NL_ARGMAX
|
|
# define NL_ARGMAX CONFIG_LIBC_NL_ARGMAX
|
|
# else
|
|
# define NL_ARGMAX 9
|
|
# endif
|
|
#endif
|
|
|
|
/* NL_LANGMAX
|
|
* Maximum number of bytes in a LANG name. Minimum Acceptable Value: 14
|
|
*/
|
|
|
|
#define NL_LANGMAX 14
|
|
|
|
/* NL_MSGMAX
|
|
* Maximum message number. Minimum Acceptable Value: 32 67
|
|
*/
|
|
|
|
#define NL_MSGMAX 32767
|
|
|
|
/* NL_NMAX
|
|
* Maximum number of bytes in an N-to-1 collation mapping. Minimum
|
|
* Acceptable Value: *
|
|
*/
|
|
|
|
/* NL_SETMAX
|
|
* Maximum set number. Minimum Acceptable Value: 255
|
|
*/
|
|
|
|
#define NL_SETMAX 255
|
|
|
|
/* NL_TEXTMAX
|
|
* Maximum number of bytes in a message string. Minimum Acceptable Value:
|
|
* _POSIX2_LINE_MAX
|
|
*/
|
|
|
|
#define NL_TEXTMAX _POSIX2_LINE_MAX
|
|
|
|
/* NZERO
|
|
* Default process priority. Minimum Acceptable Value: 20
|
|
*/
|
|
|
|
#define NZERO 20
|
|
|
|
/* Required for asynchronous I/O */
|
|
|
|
#define AIO_LISTIO_MAX _POSIX_AIO_LISTIO_MAX
|
|
#define AIO_MAX _POSIX_AIO_MAX
|
|
|
|
/* Required for POSIX message passing */
|
|
|
|
#define MQ_OPEN_MAX _POSIX_MQ_OPEN_MAX
|
|
#define MQ_PRIO_MAX _POSIX_MQ_PRIO_MAX
|
|
|
|
/* Required for POSIX semaphores */
|
|
|
|
#define SEM_NSEMS_MAX _POSIX_SEM_NSEMS_MAX
|
|
#define SEM_VALUE_MAX _POSIX_SEM_VALUE_MAX
|
|
|
|
/* Required for readv() and writev() */
|
|
|
|
/* There really is no upper limit on the number of vectors */
|
|
|
|
#define IOV_MAX INT_MAX
|
|
|
|
#endif /* __INCLUDE_LIMITS_H */
|