mirror of
https://github.com/apache/nuttx.git
synced 2026-08-02 12:49:00 +00:00
6802d3510b
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>
45 lines
1.5 KiB
Text
45 lines
1.5 KiB
Text
############################################################################
|
|
# libs/libc/sched/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.
|
|
#
|
|
############################################################################
|
|
|
|
# Add the sched C files to the build
|
|
|
|
CSRCS += sched_getprioritymax.c sched_getprioritymin.c
|
|
CSRCS += task_cancelpt.c task_setcancelstate.c task_setcanceltype.c
|
|
CSRCS += task_testcancel.c task_gettid.c
|
|
CSRCS += clock_getcpuclockid.c
|
|
|
|
ifeq ($(CONFIG_SMP),y)
|
|
CSRCS += sched_cpucount.c
|
|
endif
|
|
|
|
ifeq ($(CONFIG_SCHED_BACKTRACE),y)
|
|
CSRCS += sched_dumpstack.c sched_backtrace.c
|
|
endif
|
|
|
|
ifneq ($(CONFIG_BUILD_KERNEL),y)
|
|
CSRCS += task_startup.c
|
|
endif # CONFIG_BUILD_KERNEL
|
|
|
|
# Add the sched directory to the build
|
|
|
|
DEPPATH += --dep-path sched
|
|
VPATH += :sched
|