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utimensat.c
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utimensat.c
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/*
* Copyright (c) 2006, 2017 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/attr.h>
#include <sys/time.h>
#include <sys/fcntl.h>
#include <unistd.h>
#include <strings.h>
extern int __gettimeofday(struct timeval *, struct timezone *);
extern int __commpage_gettimeofday(struct timeval *);
static struct timespec times_now[2] = {
{ .tv_nsec = UTIME_NOW },
{ .tv_nsec = UTIME_NOW }
};
/*
* Resolve any UTIME_NOW or UTIME_OMIT and return the attributes buffer and
* attributes to pass. Assumes times_in is writable.
*/
static int
prepare_times_array_and_attrs(struct timespec times_in[2],
struct timespec times_out[2], size_t *times_out_size)
{
if (times_in[0].tv_nsec == UTIME_OMIT &&
times_in[1].tv_nsec == UTIME_OMIT) {
return 0;
}
if (times_in[0].tv_nsec == UTIME_NOW ||
times_in[1].tv_nsec == UTIME_NOW) {
struct timespec now = {};
{
/*
* TODO: Replace with nanosecond time when available
*/
struct timeval tv;
if (__commpage_gettimeofday(&tv) != 0) {
__gettimeofday(&tv, NULL);
}
TIMEVAL_TO_TIMESPEC(&tv, &now);
}
if (times_in[0].tv_nsec == UTIME_NOW) {
times_in[0] = now;
}
if (times_in[1].tv_nsec == UTIME_NOW) {
times_in[1] = now;
}
}
int attrs = 0;
*times_out_size = 0;
struct timespec *times_cursor = times_out;
if (times_in[1].tv_nsec != UTIME_OMIT) {
attrs |= ATTR_CMN_MODTIME;
*times_cursor++ = times_in[1];
*times_out_size += sizeof(struct timespec);
}
if (times_in[0].tv_nsec != UTIME_OMIT) {
attrs |= ATTR_CMN_ACCTIME;
*times_cursor = times_in[0];
*times_out_size += sizeof(struct timespec);
}
return attrs;
}
int
futimens(int fd, const struct timespec _times_in[2])
{
struct timespec times_in[2];
if (_times_in != NULL) {
memcpy(×_in, _times_in, sizeof(times_in));
} else {
memcpy(×_in, times_now, sizeof(times_in));
}
size_t attrbuf_size = 0;
struct timespec times_out[2] = {};
struct attrlist a = {
.bitmapcount = ATTR_BIT_MAP_COUNT
};
a.commonattr = prepare_times_array_and_attrs(times_in, times_out, &attrbuf_size);
return fsetattrlist(fd, &a, ×_out, attrbuf_size, 0);
}
int
utimensat(int fd, const char *path, const struct timespec _times_in[2], int flags)
{
struct timespec times_in[2];
if (_times_in != NULL) {
memcpy(×_in, _times_in, sizeof(times_in));
} else {
memcpy(×_in, times_now, sizeof(times_in));
}
size_t attrbuf_size = 0;
struct timespec times_out[2] = {};
struct attrlist a = {
.bitmapcount = ATTR_BIT_MAP_COUNT
};
a.commonattr = prepare_times_array_and_attrs(times_in, times_out, &attrbuf_size);
int flags_out = 0;
if (flags & AT_SYMLINK_NOFOLLOW) {
flags_out |= FSOPT_NOFOLLOW;
}
return setattrlistat(fd, path, &a, ×_out, attrbuf_size, flags_out);
}