nuttx/sched/clock/Make.defs

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############################################################################
# sched/clock/Make.defs
#
# 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.
#
############################################################################
CSRCS += clock.c clock_initialize.c clock_settime.c clock_gettime.c
CSRCS += clock_systime_ticks.c clock_systime_timespec.c clock_sched_ticks.c
sched/clock: support using CLOCKFD to call clock_getres This patch extends CLOCKFD support to clock_getres(), allowing applications to query the resolution of PTP clocks through file descriptors using the standard POSIX clock API. Key changes include: 1. Move clock_getres() from libc to kernel: - Relocated from libs/libc/sched/clock_getres.c to sched/clock/ - Enables direct kernel-level file descriptor handling - Maintains POSIX compliance while adding CLOCKFD support 2. CLOCKFD support in clock_getres(): - Detects CLOCKFD-encoded clockids using CLOCKFD_TO_FD() check - Extracts file descriptor from clockid parameter - Validates file descriptor through fs_getfilep() - Issues PTP_CLOCK_GETRES ioctl to query clock resolution 3. PTP clock resolution query: - Retrieves resolution from PTP clock device via ioctl - Returns nanosecond-precision timing resolution - Enables applications to determine clock accuracy capabilities - Falls back to standard clock resolution for non-CLOCKFD clockids 4. Error handling: - Returns EINVAL for invalid CLOCKFD file descriptors - Properly manages file reference counting with fs_putfilep() - Maintains backward compatibility with existing clock types 5. Build system updates: - Updated libs/libc/sched/CMakeLists.txt and Make.defs - Updated sched/clock/CMakeLists.txt to include clock_getres.c - Ensures proper compilation in kernel context Usage example: int fd = open("/dev/ptp0", O_RDONLY); struct timespec res; clock_getres(CLOCKFD(fd), &res); /* Query PTP clock resolution */ printf("Resolution: %ld.%09ld sec\n", res.tv_sec, res.tv_nsec); close(fd); This completes the basic POSIX clock API support for dynamic PTP clocks, providing applications with comprehensive clock information access. Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
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CSRCS += clock_perf.c clock_realtime2absticks.c clock_getres.c
# Unless a driver with a more accurate version of up_*delay is enabled, always
# include the base delay definition (busy-loop) as a minimum-viable product. We
# don't want the weak references to conflict.
ifneq ($(CONFIG_TIMER_ARCH),y)
ifneq ($(CONFIG_ALARM_ARCH),y)
CSRCS += delay.c
endif
endif
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ifeq ($(CONFIG_CLOCK_TIMEKEEPING),y)
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CSRCS += clock_timekeeping.c
endif
ifeq ($(CONFIG_CLOCK_ADJTIME),y)
CSRCS += clock_adjtime.c
endif
# Include clock build support
DEPPATH += --dep-path clock
VPATH += :clock