63 lines
2.3 KiB
C
63 lines
2.3 KiB
C
/*
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* Copyright (C) 2013 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/time.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#pragma GCC visibility push(hidden)
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int timespec_from_timeval(struct timespec* ts, const struct timeval tv) {
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// Whole seconds can just be copied.
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ts->tv_sec = tv.tv_sec;
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// But we might overflow when converting microseconds to nanoseconds.
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if (tv.tv_usec >= 1000000 || tv.tv_usec < 0) {
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return 0;
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}
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ts->tv_nsec = tv.tv_usec * 1000;
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return 1;
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}
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static int futimesat(int fd, const char* path, const struct timeval tv[2], int flags) {
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struct timespec ts[2];
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if (tv && (!timespec_from_timeval(&ts[0], tv[0]) || !timespec_from_timeval(&ts[1], tv[1]))) {
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errno = EINVAL;
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return -1;
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}
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return utimensat(fd, path, tv ? ts : NULL, flags);
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}
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int lutimes(const char* path, const struct timeval tv[2]) {
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return futimesat(AT_FDCWD, path, tv, AT_SYMLINK_NOFOLLOW);
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}
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#pragma GCC visibility pop
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