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dongjiuzhu1
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>
98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/****************************************************************************
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* sched/clock/clock_getres.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdint.h>
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#include <time.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/clock.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/timers/ptp_clock.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: clock_getres
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*
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* Description:
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* Clock Functions based on POSIX APIs
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*
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****************************************************************************/
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int clock_getres(clockid_t clock_id, struct timespec *res)
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{
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clockid_t clock_type = clock_id & CLOCK_MASK;
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int ret = OK;
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sinfo("clock_id=%d, clock_type=%d\n", clock_id, clock_type);
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switch (clock_type)
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{
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default:
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serr("Returning ERROR\n");
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set_errno(EINVAL);
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ret = ERROR;
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break;
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case CLOCK_MONOTONIC:
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case CLOCK_BOOTTIME:
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case CLOCK_REALTIME:
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case CLOCK_PROCESS_CPUTIME_ID:
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case CLOCK_THREAD_CPUTIME_ID:
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/* Form the timspec using clock resolution in nanoseconds */
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res->tv_sec = 0;
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res->tv_nsec = NSEC_PER_TICK;
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sinfo("Returning res=(%d,%d)\n", (int)res->tv_sec,
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(int)res->tv_nsec);
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break;
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#ifdef CONFIG_PTP_CLOCK
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case CLOCK_FD:
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{
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FAR struct file *filep;
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ret = ptp_clockid_to_filep(clock_id, &filep);
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if (ret < 0)
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{
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return ret;
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}
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ret = file_ioctl(filep, PTP_CLOCK_GETRES, res);
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fs_putfilep(filep);
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}
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break;
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#endif
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}
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return ret;
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}
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