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8a854ba309
Implement futimes() in terms of utimensat(). Now, utimensat() strays from POSIX compliance because it also accepts a combination of a file descriptor of a regular file and an empty path. utimensat() then uses this file descriptor instead of the path to update the last access and/or modification time of a file. That being said, its prior behavior remains intact. With the new behavior of utimensat(), `path` must point to a valid string; given a null pointer instead of an empty string, utimensat() sets `errno` to `EFAULT` and returns a failure.
119 lines
3.0 KiB
C++
119 lines
3.0 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <syscall.h>
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#include <unistd.h>
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extern "C" {
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/umask.html
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mode_t umask(mode_t mask)
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{
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return syscall(SC_umask, mask);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/mkdir.html
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int mkdir(char const* pathname, mode_t mode)
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{
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if (!pathname) {
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errno = EFAULT;
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return -1;
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}
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int rc = syscall(SC_mkdir, pathname, strlen(pathname), mode);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/chmod.html
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int chmod(char const* pathname, mode_t mode)
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{
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return fchmodat(AT_FDCWD, pathname, mode, 0);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/fchmodat.html
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int fchmodat(int dirfd, char const* pathname, mode_t mode, int flags)
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{
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if (!pathname) {
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errno = EFAULT;
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return -1;
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}
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if (flags & ~AT_SYMLINK_NOFOLLOW) {
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errno = EINVAL;
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return -1;
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}
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Syscall::SC_chmod_params params {
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dirfd,
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{ pathname, strlen(pathname) },
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mode,
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!(flags & AT_SYMLINK_NOFOLLOW)
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};
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int rc = syscall(SC_chmod, ¶ms);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/fchmod.html
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int fchmod(int fd, mode_t mode)
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{
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int rc = syscall(SC_fchmod, fd, mode);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/mkfifo.html
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int mkfifo(char const* pathname, mode_t mode)
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{
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return mknod(pathname, mode | S_IFIFO, 0);
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}
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static int do_stat(int dirfd, char const* path, struct stat* statbuf, bool follow_symlinks)
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{
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if (!path) {
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errno = EFAULT;
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return -1;
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}
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Syscall::SC_stat_params params { { path, strlen(path) }, statbuf, dirfd, follow_symlinks };
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int rc = syscall(SC_stat, ¶ms);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/lstat.html
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int lstat(char const* path, struct stat* statbuf)
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{
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return do_stat(AT_FDCWD, path, statbuf, false);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/stat.html
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int stat(char const* path, struct stat* statbuf)
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{
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return do_stat(AT_FDCWD, path, statbuf, true);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/fstat.html
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int fstat(int fd, struct stat* statbuf)
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{
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int rc = syscall(SC_fstat, fd, statbuf);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/fstatat.html
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int fstatat(int fd, char const* path, struct stat* statbuf, int flags)
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{
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return do_stat(fd, path, statbuf, !(flags & AT_SYMLINK_NOFOLLOW));
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}
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/futimens.html
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int futimens(int fd, struct timespec const times[2])
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{
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return utimensat(fd, "", times, 0);
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}
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}
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