| /**************************************************************************** |
| * include/limits.h |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. The |
| * ASF licenses this file to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance with the |
| * License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations |
| * under the License. |
| * |
| ****************************************************************************/ |
| |
| #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 4 |
| |
| /* 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 Number of realtime signals reserved |
| * for application |
| * _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 16 |
| #define _POSIX_PATH_MAX CONFIG_PATH_MAX |
| #define _POSIX_PIPE_BUF 512 |
| #define _POSIX_STREAM_MAX 16 |
| #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 ULONG_MAX |
| #define _POSIX_SIZE_MIN 0 |
| |
| #define _POSIX_SSIZE_MAX LONG_MAX |
| #define _POSIX_SSIZE_MIN LONG_MIN |
| |
| #endif /* CONFIG_SMALL_MEMORY */ |
| |
| /* Required for sigqueue */ |
| |
| #define _POSIX_RTSIG_MAX 8 /* Number of reserved realtime signals */ |
| #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 TTY_NAME_MAX _POSIX_NAME_MAX |
| #define NGROUPS_MAX _POSIX_NGROUPS_MAX |
| #if CONFIG_LIBC_OPEN_MAX < _POSIX_OPEN_MAX |
| # define OPEN_MAX _POSIX_OPEN_MAX |
| #else |
| # define OPEN_MAX CONFIG_LIBC_OPEN_MAX |
| #endif |
| #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 32 |
| #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 |
| |
| #ifdef CONFIG_SYSTEM_TIME64 |
| # define CLOCK_MAX UINT64_MAX |
| #else |
| # define CLOCK_MAX UINT32_MAX |
| #endif |
| |
| /* 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: 100 |
| */ |
| |
| #define NZERO SCHED_PRIORITY_DEFAULT |
| |
| /* 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 |
| |
| #define HOST_NAME_MAX 32 |
| |
| /* ptrdiff_t limits */ |
| |
| #define PTRDIFF_MAX PTR_MAX |
| #define PTRDIFF_MIN PTR_MIN |
| |
| #endif /* __INCLUDE_LIMITS_H */ |
