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nuttx/include/limits.h
Xiang Xiao c47b1e2c5b !sys/types.h: change time_t and clock_t to int64_t to align with other OSes 
POSIX leaves the signedness of time_t and clock_t unspecified, but
mainstream implementations (Linux glibc/musl, the BSDs, macOS, RTEMS,
Zephyr's POSIX layer, Windows _time64) expose time_t as signed 64-bit.
NuttX has historically used uint64_t only because it was tied to the
CONFIG_SYSTEM_TIME64 knob; with that gone, switch:

  time_t   : uint64_t  -> int64_t
  clock_t  : uint64_t  -> int64_t
  CLOCK_MAX: UINT64_MAX -> INT64_MAX

This lets (time_t)-1 sentinels, negative tick deltas, and host-side
headers behave as on every other POSIX system without source churn.

Headers updated:
  - include/sys/types.h, include/limits.h, include/nuttx/clock.h
  - include/nuttx/fs/hostfs.h (nuttx_time_t alias)
  - include/nuttx/{mqueue.h,wdog.h,wqueue.h,timers/clkcnt.h}

Because clock_t is now signed 64-bit, the NuttX-internal sclock_t
alias becomes redundant: every sclock_t/SCLOCK_MAX use is folded
back to clock_t/CLOCK_MAX (notably in sched/wdog, sched/mqueue,
sched/sched, sched/clock, sched/timer, libs/libc/time, fs/vfs and
the drivers/arch consumers below).

Tick/period constants (NSEC_PER_SEC, USEC_PER_SEC, MSEC_PER_SEC,
SEC_PER_MIN, ...) in include/nuttx/clock.h are retyped from "long"
literals to INT64_C(...) so that 64-bit arithmetic no longer
depends on the host's long width.

Strip now-redundant (time_t)/(clock_t)/(unsigned long) casts and
unsigned-only branches across the tree:
  - arch RTC / oneshot / tickless lowerhalfs:
      arm: cxd56xx, efm32, imxrt, lc823450, max326xx, sam34, sama5,
           samd5e5, samv7, stm32, stm32f7, stm32h7, stm32l4, stm32wb,
           xmc4
      mips: pic32mz       sparc: bm3803       x86_64: intel64
      risc-v/xtensa: espressif (esp_i2c[_slave], esp_rtc,
           esp32c3{_i2c,_rtc,_wifi_adapter}, esp32{,s2,s3}_*),
           mpfs_perf
  - drivers: audio/tone, input/aw86225, power/pm/{activity,
           stability}_governor, rpmsg/rpmsg_ping,
           timers/{ds3231,mcp794xx,pcf85263,rx8010},
           wireless/ieee80211/bcm43xxx, wireless/spirit/spirit_spi
  - core: fs/vfs/{fs_poll,fs_timerfd}, mm/iob/iob_alloc,
          libs/libc/{netdb/lib_dnscache,time/{lib_calendar2utc,
          lib_time}}, net/icmp/icmp_pmtu, net/icmpv6/icmpv6_pmtu,
          net/ipfrag, net/tcp/{tcp.h,tcp_timer},
          net/utils/net_snoop, net/mld/mld_query (drop the now-dead
          mld_mrc2mrd helper since signed math handles it directly),
          sched/clock/{clock,clock_initialize},
          sched/sched/{sched_profil,sched_setparam,sched_setscheduler},
          sched/pthread/pthread_create,
          sched/wdog/{wd_gettime,wd_start,wdog.h},
          sched/timer/timer_gettime, sched/mqueue/*

Flip the few in-tree printf format strings that assumed an
unsigned 64-bit tv_sec:
  * drivers/rpmsg/rpmsg_ping.c                       PRIu64 -> PRId64
  * arch/xtensa/src/esp32{,s2,s3}/esp32*_oneshot_lowerhalf.c
                                          PRIu32 (already wrong) -> PRId64

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
2026-05-19 16:21:28 +08:00

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/****************************************************************************
* include/limits.h
*
* SPDX-License-Identifier: Apache-2.0
*
* 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
#define _POSIX2_LINE_MAX CONFIG_LINE_MAX
#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 INT_MAX
/* 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 LINE_MAX _POSIX2_LINE_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
#define CLOCK_MAX INT64_MAX
/* 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 POSIX pthread management */
#define _POSIX_THREAD_DESTRUCTOR_ITERATIONS 4
#define _POSIX_THREAD_KEYS_MAX CONFIG_TLS_NELEM
#define _POSIX_THREAD_THREADS_MAX 64
/* 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 */
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