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82 lines
2.4 KiB
82 lines
2.4 KiB
/*
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* Copyright © 2018 Collabora, Ltd
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "config.h"
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#include <assert.h>
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#include <errno.h>
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#include <poll.h>
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#include <stddef.h>
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#include <sys/ioctl.h>
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#ifdef HAVE_LINUX_SYNC_FILE_H
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#include <linux/sync_file.h>
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#else
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#include "linux-sync-file-uapi.h"
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#endif
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#include "linux-sync-file.h"
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#include "shared/timespec-util.h"
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/* Check that a file descriptor represents a valid sync file
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*
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* \param fd[in] a file descriptor
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* \return true if fd is a valid sync file, false otherwise
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*/
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bool
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linux_sync_file_is_valid(int fd)
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{
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struct sync_file_info file_info = { { 0 } };
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if (ioctl(fd, SYNC_IOC_FILE_INFO, &file_info) < 0)
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return false;
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return file_info.num_fences > 0;
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}
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/* Read the timestamp stored in a sync file
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*
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* \param fd[in] fd a file descriptor for a sync file
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* \param ts[out] the timespec struct to fill with the timestamp
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* \return 0 if a timestamp was read, -1 on error
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*/
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int
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linux_sync_file_read_timestamp(int fd, struct timespec *ts)
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{
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struct sync_file_info file_info = { { 0 } };
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struct sync_fence_info fence_info = { { 0 } };
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assert(ts != NULL);
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file_info.sync_fence_info = (uint64_t)(uintptr_t)&fence_info;
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file_info.num_fences = 1;
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if (ioctl(fd, SYNC_IOC_FILE_INFO, &file_info) < 0)
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return -1;
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timespec_from_nsec(ts, fence_info.timestamp_ns);
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return 0;
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}
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