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authorValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
committerValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
commita990de90fe41456a23e58bd087d2f107d321f3a1 (patch)
tree15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/rustix/src/fs/abs.rs
parent3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff)
downloadfparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz
fparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.zip
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-//! POSIX-style filesystem functions which operate on bare paths.
-
-use crate::fd::OwnedFd;
-#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
-use crate::fs::Access;
-#[cfg(not(any(
- solarish,
- target_os = "espidf",
- target_os = "haiku",
- target_os = "netbsd",
- target_os = "nto",
- target_os = "redox",
- target_os = "vita",
- target_os = "wasi",
-)))]
-use crate::fs::StatFs;
-#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
-use crate::fs::StatVfs;
-use crate::fs::{Mode, OFlags, Stat};
-#[cfg(not(target_os = "wasi"))]
-use crate::ugid::{Gid, Uid};
-use crate::{backend, io, path};
-#[cfg(feature = "alloc")]
-use {
- crate::ffi::{CStr, CString},
- crate::path::SMALL_PATH_BUFFER_SIZE,
- alloc::vec::Vec,
-};
-
-/// `open(path, oflags, mode)`—Opens a file.
-///
-/// POSIX guarantees that `open` will use the lowest unused file descriptor,
-/// however it is not safe in general to rely on this, as file descriptors may
-/// be unexpectedly allocated on other threads or in libraries.
-///
-/// The `Mode` argument is only significant when creating a file.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/open.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/open.2.html
-#[inline]
-pub fn open<P: path::Arg>(path: P, flags: OFlags, mode: Mode) -> io::Result<OwnedFd> {
- path.into_with_c_str(|path| backend::fs::syscalls::open(path, flags, mode))
-}
-
-/// `chmod(path, mode)`—Sets file or directory permissions.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/chmod.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/chmod.2.html
-#[cfg(not(target_os = "wasi"))]
-#[inline]
-pub fn chmod<P: path::Arg>(path: P, mode: Mode) -> io::Result<()> {
- path.into_with_c_str(|path| backend::fs::syscalls::chmod(path, mode))
-}
-
-/// `stat(path)`—Queries metadata for a file or directory.
-///
-/// [`Mode::from_raw_mode`] and [`FileType::from_raw_mode`] may be used to
-/// interpret the `st_mode` field.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stat.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/stat.2.html
-/// [`Mode::from_raw_mode`]: crate::fs::Mode::from_raw_mode
-/// [`FileType::from_raw_mode`]: crate::fs::FileType::from_raw_mode
-#[inline]
-pub fn stat<P: path::Arg>(path: P) -> io::Result<Stat> {
- path.into_with_c_str(backend::fs::syscalls::stat)
-}
-
-/// `lstat(path)`—Queries metadata for a file or directory, without following
-/// symlinks.
-///
-/// [`Mode::from_raw_mode`] and [`FileType::from_raw_mode`] may be used to
-/// interpret the `st_mode` field.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/lstat.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/lstat.2.html
-/// [`Mode::from_raw_mode`]: crate::fs::Mode::from_raw_mode
-/// [`FileType::from_raw_mode`]: crate::fs::FileType::from_raw_mode
-#[inline]
-pub fn lstat<P: path::Arg>(path: P) -> io::Result<Stat> {
- path.into_with_c_str(backend::fs::syscalls::lstat)
-}
-
-/// `readlink(path)`—Reads the contents of a symlink.
-///
-/// If `reuse` is non-empty, reuse its buffer to store the result if possible.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/readlink.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/readlink.2.html
-#[cfg(feature = "alloc")]
-#[inline]
-pub fn readlink<P: path::Arg, B: Into<Vec<u8>>>(path: P, reuse: B) -> io::Result<CString> {
- path.into_with_c_str(|path| _readlink(path, reuse.into()))
-}
-
-#[cfg(feature = "alloc")]
-fn _readlink(path: &CStr, mut buffer: Vec<u8>) -> io::Result<CString> {
- // This code would benefit from having a better way to read into
- // uninitialized memory, but that requires `unsafe`.
- buffer.clear();
- buffer.reserve(SMALL_PATH_BUFFER_SIZE);
- buffer.resize(buffer.capacity(), 0_u8);
-
- loop {
- let nread = backend::fs::syscalls::readlink(path, &mut buffer)?;
-
- let nread = nread as usize;
- assert!(nread <= buffer.len());
- if nread < buffer.len() {
- buffer.resize(nread, 0_u8);
- return Ok(CString::new(buffer).unwrap());
- }
- // Use `Vec` reallocation strategy to grow capacity exponentially.
- buffer.reserve(1);
- buffer.resize(buffer.capacity(), 0_u8);
- }
-}
-
-/// `rename(old_path, new_path)`—Renames a file or directory.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/rename.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/rename.2.html
-#[inline]
-pub fn rename<P: path::Arg, Q: path::Arg>(old_path: P, new_path: Q) -> io::Result<()> {
- old_path.into_with_c_str(|old_path| {
- new_path.into_with_c_str(|new_path| backend::fs::syscalls::rename(old_path, new_path))
- })
-}
-
-/// `unlink(path)`—Unlinks a file.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/unlink.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/unlink.2.html
-#[inline]
-pub fn unlink<P: path::Arg>(path: P) -> io::Result<()> {
- path.into_with_c_str(backend::fs::syscalls::unlink)
-}
-
-/// `rmdir(path)`—Removes a directory.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/rmdir.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/rmdir.2.html
-#[inline]
-pub fn rmdir<P: path::Arg>(path: P) -> io::Result<()> {
- path.into_with_c_str(backend::fs::syscalls::rmdir)
-}
-
-/// `link(old_path, new_path)`—Creates a hard link.
-///
-/// POSIX leaves it implementation-defined whether `link` follows a symlink in
-/// `old_path`, or creates a new link to the symbolic link itself. On platforms
-/// which have it, [`linkat`] avoids this problem since it has an [`AtFlags`]
-/// paramter and the [`AtFlags::SYMLINK_FOLLOW`] flag determines whether
-/// symlinks should be followed.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/link.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/link.2.html
-/// [`linkat`]: crate::fs::linkat
-/// [`AtFlags`]: crate::fs::AtFlags
-/// [`AtFlags::SYMLINK_FOLLOW`]: crate::fs::AtFlags::SYMLINK_FOLLOW
-#[inline]
-pub fn link<P: path::Arg, Q: path::Arg>(old_path: P, new_path: Q) -> io::Result<()> {
- old_path.into_with_c_str(|old_path| {
- new_path.into_with_c_str(|new_path| backend::fs::syscalls::link(old_path, new_path))
- })
-}
-
-/// `symlink(old_path, new_path)`—Creates a symlink.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/symlink.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/symlink.2.html
-#[inline]
-pub fn symlink<P: path::Arg, Q: path::Arg>(old_path: P, new_path: Q) -> io::Result<()> {
- old_path.into_with_c_str(|old_path| {
- new_path.into_with_c_str(|new_path| backend::fs::syscalls::symlink(old_path, new_path))
- })
-}
-
-/// `mkdir(path, mode)`—Creates a directory.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/mkdir.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/mkdir.2.html
-#[inline]
-pub fn mkdir<P: path::Arg>(path: P, mode: Mode) -> io::Result<()> {
- path.into_with_c_str(|path| backend::fs::syscalls::mkdir(path, mode))
-}
-
-/// `access(path, access)`—Tests permissions for a file or directory.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/access.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/access.2.html
-#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
-#[inline]
-pub fn access<P: path::Arg>(path: P, access: Access) -> io::Result<()> {
- path.into_with_c_str(|path| backend::fs::syscalls::access(path, access))
-}
-
-/// `statfs`—Queries filesystem metadata.
-///
-/// Compared to [`statvfs`], this function often provides more information,
-/// though it's less portable.
-///
-/// # References
-/// - [Linux]
-///
-/// [Linux]: https://man7.org/linux/man-pages/man2/statfs.2.html
-#[cfg(not(any(
- solarish,
- target_os = "espidf",
- target_os = "haiku",
- target_os = "netbsd",
- target_os = "nto",
- target_os = "redox",
- target_os = "vita",
- target_os = "wasi",
-)))]
-#[inline]
-pub fn statfs<P: path::Arg>(path: P) -> io::Result<StatFs> {
- path.into_with_c_str(backend::fs::syscalls::statfs)
-}
-
-/// `statvfs`—Queries filesystem metadata, POSIX version.
-///
-/// Compared to [`statfs`], this function often provides less information, but
-/// it is more portable. But even so, filesystems are very diverse and not all
-/// the fields are meaningful for every filesystem. And `f_fsid` doesn't seem
-/// to have a clear meaning anywhere.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/statvfs.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/statvfs.2.html
-#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
-#[inline]
-pub fn statvfs<P: path::Arg>(path: P) -> io::Result<StatVfs> {
- path.into_with_c_str(backend::fs::syscalls::statvfs)
-}
-
-/// `chown(path, owner, group)`—Sets open file or directory ownership.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/chown.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/chown.2.html
-#[cfg(not(target_os = "wasi"))]
-#[inline]
-pub fn chown<P: path::Arg>(path: P, owner: Option<Uid>, group: Option<Gid>) -> io::Result<()> {
- path.into_with_c_str(|path| backend::fs::syscalls::chown(path, owner, group))
-}