mirror of
https://github.com/jart/cosmopolitan.git
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83 lines
4.1 KiB
C
83 lines
4.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/asan.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/calls/struct/timespec.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/zipos/zipos.internal.h"
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/**
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* Sets atime/mtime on file, the modern way.
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*
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* This is two functions in one. If `path` is null then this function
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* becomes the same as `futimens(dirfd, ts)`.
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*
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* XNU and RHEL5 only have microsecond accuracy and there's no `dirfd`
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* relative support.
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*
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* @param dirfd should AT_FDCWD
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* @param ts is atime/mtime, or null for current time
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* @param flags can have AT_SYMLINK_NOFOLLOW
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* @raise ENOSYS on RHEL5 if path is NULL
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* @raise EINVAL if flags had unrecognized bits
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* @raise EINVAL if path is NULL and flags has AT_SYMLINK_NOFOLLOW
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* @raise EBADF if dirfd isn't a valid fd or AT_FDCWD
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* @raise EFAULT if path or ts memory was invalid
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* @raise EROFS if file system is read-only
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* @raise ENAMETOOLONG
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* @raise EPERM
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* @see futimens()
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* @asyncsignalsafe
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*/
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int utimensat(int dirfd, const char *path, const struct timespec ts[2],
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int flags) {
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int rc;
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if (IsAsan() && ((dirfd == AT_FDCWD && !__asan_is_valid(path, 1)) ||
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(ts && (!__asan_is_valid_timespec(ts + 0) ||
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!__asan_is_valid_timespec(ts + 1))))) {
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rc = efault(); // bad memory
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} else if ((flags & ~AT_SYMLINK_NOFOLLOW)) {
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rc = einval(); // unsupported flag
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} else if (!path && flags) {
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rc = einval(); // futimens() doesn't take flags
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} else if ((path || __isfdkind(dirfd, kFdZip)) && weaken(__zipos_notat) &&
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(rc = __zipos_notat(dirfd, path)) == -1) {
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STRACE("zipos utimensat not supported yet");
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} else if (!IsWindows()) {
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rc = sys_utimensat(dirfd, path, ts, flags);
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} else {
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rc = sys_utimensat_nt(dirfd, path, ts, flags);
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}
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if (ts) {
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STRACE("utimensat(%s, %#s, {{%,ld, %,ld}, {%,ld, %,ld}}, %#b) → %d% m",
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DescribeDirfd(dirfd), path, ts[0].tv_sec, ts[0].tv_nsec,
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ts[1].tv_sec, ts[1].tv_nsec, flags, rc);
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} else {
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STRACE("utimensat(%s, %#s, 0, %#b) → %d% m", DescribeDirfd(dirfd), path,
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flags, rc);
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}
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return rc;
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}
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