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e7310ba45a
The function fstatat can do the same thing as the stat and lstat functions. However, it can be passed the file descriptor of a directory which will be used when as the starting point for relative paths. This is contrary to stat and lstat which use the current working directory as the starting for relative paths.
85 lines
1.8 KiB
C++
85 lines
1.8 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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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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int mkdir(const char* 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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int chmod(const char* 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_chmod, pathname, strlen(pathname), mode);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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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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int mkfifo(const char* 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, const char* 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 { dirfd, { path, strlen(path) }, statbuf, 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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int lstat(const char* 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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int stat(const char* 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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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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int fstatat(int fd, const char* 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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}
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