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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>
49 lines
1.7 KiB
Plaintext
49 lines
1.7 KiB
Plaintext
############################################################################
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# sched/clock/Make.defs
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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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CSRCS += clock.c clock_initialize.c clock_settime.c clock_gettime.c
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CSRCS += clock_systime_ticks.c clock_systime_timespec.c clock_sched_ticks.c
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CSRCS += clock_perf.c clock_realtime2absticks.c clock_getres.c
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# Unless a driver with a more accurate version of up_*delay is enabled, always
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# include the base delay definition (busy-loop) as a minimum-viable product. We
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# don't want the weak references to conflict.
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ifneq ($(CONFIG_TIMER_ARCH),y)
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ifneq ($(CONFIG_ALARM_ARCH),y)
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CSRCS += delay.c
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endif
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endif
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ifeq ($(CONFIG_CLOCK_TIMEKEEPING),y)
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CSRCS += clock_timekeeping.c
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endif
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ifeq ($(CONFIG_CLOCK_ADJTIME),y)
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CSRCS += clock_adjtime.c
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endif
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# Include clock build support
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DEPPATH += --dep-path clock
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VPATH += :clock
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