| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/nix-0.26.2/src/fcntl.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>fcntl.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../nix/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../nix/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| <span id="856">856</span> |
| <span id="857">857</span> |
| <span id="858">858</span> |
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| <span id="860">860</span> |
| <span id="861">861</span> |
| <span id="862">862</span> |
| <span id="863">863</span> |
| <span id="864">864</span> |
| <span id="865">865</span> |
| <span id="866">866</span> |
| <span id="867">867</span> |
| <span id="868">868</span> |
| <span id="869">869</span> |
| <span id="870">870</span> |
| <span id="871">871</span> |
| <span id="872">872</span> |
| <span id="873">873</span> |
| <span id="874">874</span> |
| <span id="875">875</span> |
| <span id="876">876</span> |
| <span id="877">877</span> |
| <span id="878">878</span> |
| <span id="879">879</span> |
| <span id="880">880</span> |
| <span id="881">881</span> |
| <span id="882">882</span> |
| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::errno::Errno; |
| <span class="kw">use </span>libc::{<span class="self">self</span>, c_char, c_int, c_uint, size_t, ssize_t}; |
| <span class="kw">use </span>std::ffi::OsString; |
| <span class="attribute">#[cfg(not(target_os = <span class="string">"redox"</span>))] |
| </span><span class="kw">use </span>std::os::raw; |
| <span class="kw">use </span>std::os::unix::ffi::OsStringExt; |
| <span class="kw">use </span>std::os::unix::io::RawFd; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"fs"</span>)] |
| </span><span class="kw">use crate</span>::{sys::stat::Mode, NixPath, <span class="prelude-ty">Result</span>}; |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] |
| </span><span class="kw">use </span>std::ptr; <span class="comment">// For splice and copy_file_range |
| |
| </span><span class="attribute">#[cfg(any( |
| target_os = <span class="string">"linux"</span>, |
| target_os = <span class="string">"android"</span>, |
| target_os = <span class="string">"emscripten"</span>, |
| target_os = <span class="string">"fuchsia"</span>, |
| target_os = <span class="string">"wasi"</span>, |
| target_env = <span class="string">"uclibc"</span>, |
| target_os = <span class="string">"freebsd" |
| </span>))] |
| #[cfg(feature = <span class="string">"fs"</span>)] |
| </span><span class="kw">pub use </span><span class="self">self</span>::posix_fadvise::{posix_fadvise, PosixFadviseAdvice}; |
| |
| <span class="attribute">#[cfg(not(target_os = <span class="string">"redox"</span>))] |
| #[cfg(any(feature = <span class="string">"fs"</span>, feature = <span class="string">"process"</span>))] |
| </span><span class="macro">libc_bitflags! </span>{ |
| <span class="attribute">#[cfg_attr(docsrs, doc(cfg(any(feature = <span class="string">"fs"</span>, feature = <span class="string">"process"</span>))))] |
| </span><span class="kw">pub struct </span>AtFlags: c_int { |
| AT_REMOVEDIR; |
| AT_SYMLINK_FOLLOW; |
| AT_SYMLINK_NOFOLLOW; |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] |
| </span>AT_NO_AUTOMOUNT; |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] |
| </span>AT_EMPTY_PATH; |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"illumos"</span>, target_os = <span class="string">"solaris"</span>))] |
| </span>AT_EACCESS; |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(feature = <span class="string">"fs"</span>, feature = <span class="string">"term"</span>))] |
| </span><span class="macro">libc_bitflags!</span>( |
| <span class="doccomment">/// Configuration options for opened files. |
| </span><span class="attribute">#[cfg_attr(docsrs, doc(cfg(any(feature = <span class="string">"fs"</span>, feature = <span class="string">"term"</span>))))] |
| </span><span class="kw">pub struct </span>OFlag: c_int { |
| <span class="doccomment">/// Mask for the access mode of the file. |
| </span>O_ACCMODE; |
| <span class="doccomment">/// Use alternate I/O semantics. |
| </span><span class="attribute">#[cfg(target_os = <span class="string">"netbsd"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_ALT_IO; |
| <span class="doccomment">/// Open the file in append-only mode. |
| </span>O_APPEND; |
| <span class="doccomment">/// Generate a signal when input or output becomes possible. |
| </span><span class="attribute">#[cfg(not(any(target_os = <span class="string">"illumos"</span>, target_os = <span class="string">"solaris"</span>, target_os = <span class="string">"haiku"</span>)))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_ASYNC; |
| <span class="doccomment">/// Closes the file descriptor once an `execve` call is made. |
| /// |
| /// Also sets the file offset to the beginning of the file. |
| </span>O_CLOEXEC; |
| <span class="doccomment">/// Create the file if it does not exist. |
| </span>O_CREAT; |
| <span class="doccomment">/// Try to minimize cache effects of the I/O for this file. |
| </span><span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, |
| target_os = <span class="string">"dragonfly"</span>, |
| target_os = <span class="string">"freebsd"</span>, |
| target_os = <span class="string">"linux"</span>, |
| target_os = <span class="string">"netbsd"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_DIRECT; |
| <span class="doccomment">/// If the specified path isn't a directory, fail. |
| </span><span class="attribute">#[cfg(not(any(target_os = <span class="string">"illumos"</span>, target_os = <span class="string">"solaris"</span>)))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_DIRECTORY; |
| <span class="doccomment">/// Implicitly follow each `write()` with an `fdatasync()`. |
| </span><span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, |
| target_os = <span class="string">"ios"</span>, |
| target_os = <span class="string">"linux"</span>, |
| target_os = <span class="string">"macos"</span>, |
| target_os = <span class="string">"netbsd"</span>, |
| target_os = <span class="string">"openbsd"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_DSYNC; |
| <span class="doccomment">/// Error out if a file was not created. |
| </span>O_EXCL; |
| <span class="doccomment">/// Open for execute only. |
| </span><span class="attribute">#[cfg(target_os = <span class="string">"freebsd"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_EXEC; |
| <span class="doccomment">/// Open with an exclusive file lock. |
| </span><span class="attribute">#[cfg(any(target_os = <span class="string">"dragonfly"</span>, |
| target_os = <span class="string">"freebsd"</span>, |
| target_os = <span class="string">"ios"</span>, |
| target_os = <span class="string">"macos"</span>, |
| target_os = <span class="string">"netbsd"</span>, |
| target_os = <span class="string">"openbsd"</span>, |
| target_os = <span class="string">"redox"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_EXLOCK; |
| <span class="doccomment">/// Same as `O_SYNC`. |
| </span><span class="attribute">#[cfg(any(target_os = <span class="string">"dragonfly"</span>, |
| target_os = <span class="string">"freebsd"</span>, |
| target_os = <span class="string">"ios"</span>, |
| all(target_os = <span class="string">"linux"</span>, not(target_env = <span class="string">"musl"</span>)), |
| target_os = <span class="string">"macos"</span>, |
| target_os = <span class="string">"netbsd"</span>, |
| target_os = <span class="string">"openbsd"</span>, |
| target_os = <span class="string">"redox"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_FSYNC; |
| <span class="doccomment">/// Allow files whose sizes can't be represented in an `off_t` to be opened. |
| </span><span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_LARGEFILE; |
| <span class="doccomment">/// Do not update the file last access time during `read(2)`s. |
| </span><span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_NOATIME; |
| <span class="doccomment">/// Don't attach the device as the process' controlling terminal. |
| </span><span class="attribute">#[cfg(not(target_os = <span class="string">"redox"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_NOCTTY; |
| <span class="doccomment">/// Same as `O_NONBLOCK`. |
| </span><span class="attribute">#[cfg(not(any(target_os = <span class="string">"redox"</span>, target_os = <span class="string">"haiku"</span>)))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_NDELAY; |
| <span class="doccomment">/// `open()` will fail if the given path is a symbolic link. |
| </span>O_NOFOLLOW; |
| <span class="doccomment">/// When possible, open the file in nonblocking mode. |
| </span>O_NONBLOCK; |
| <span class="doccomment">/// Don't deliver `SIGPIPE`. |
| </span><span class="attribute">#[cfg(target_os = <span class="string">"netbsd"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_NOSIGPIPE; |
| <span class="doccomment">/// Obtain a file descriptor for low-level access. |
| /// |
| /// The file itself is not opened and other file operations will fail. |
| </span><span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>, target_os = <span class="string">"redox"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_PATH; |
| <span class="doccomment">/// Only allow reading. |
| /// |
| /// This should not be combined with `O_WRONLY` or `O_RDWR`. |
| </span>O_RDONLY; |
| <span class="doccomment">/// Allow both reading and writing. |
| /// |
| /// This should not be combined with `O_WRONLY` or `O_RDONLY`. |
| </span>O_RDWR; |
| <span class="doccomment">/// Similar to `O_DSYNC` but applies to `read`s instead. |
| </span><span class="attribute">#[cfg(any(target_os = <span class="string">"linux"</span>, target_os = <span class="string">"netbsd"</span>, target_os = <span class="string">"openbsd"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_RSYNC; |
| <span class="doccomment">/// Skip search permission checks. |
| </span><span class="attribute">#[cfg(target_os = <span class="string">"netbsd"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_SEARCH; |
| <span class="doccomment">/// Open with a shared file lock. |
| </span><span class="attribute">#[cfg(any(target_os = <span class="string">"dragonfly"</span>, |
| target_os = <span class="string">"freebsd"</span>, |
| target_os = <span class="string">"ios"</span>, |
| target_os = <span class="string">"macos"</span>, |
| target_os = <span class="string">"netbsd"</span>, |
| target_os = <span class="string">"openbsd"</span>, |
| target_os = <span class="string">"redox"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_SHLOCK; |
| <span class="doccomment">/// Implicitly follow each `write()` with an `fsync()`. |
| </span><span class="attribute">#[cfg(not(target_os = <span class="string">"redox"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_SYNC; |
| <span class="doccomment">/// Create an unnamed temporary file. |
| </span><span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_TMPFILE; |
| <span class="doccomment">/// Truncate an existing regular file to 0 length if it allows writing. |
| </span>O_TRUNC; |
| <span class="doccomment">/// Restore default TTY attributes. |
| </span><span class="attribute">#[cfg(target_os = <span class="string">"freebsd"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(all())))] |
| </span>O_TTY_INIT; |
| <span class="doccomment">/// Only allow writing. |
| /// |
| /// This should not be combined with `O_RDONLY` or `O_RDWR`. |
| </span>O_WRONLY; |
| } |
| ); |
| |
| <span class="macro">feature! </span>{ |
| <span class="attribute">#![feature = <span class="string">"fs"</span>] |
| |
| </span><span class="comment">// The conversion is not identical on all operating systems. |
| </span><span class="attribute">#[allow(clippy::useless_conversion)] |
| </span><span class="kw">pub fn </span>open<P: <span class="question-mark">?</span>Sized + NixPath>(path: <span class="kw-2">&</span>P, oflag: OFlag, mode: Mode) -> <span class="prelude-ty">Result</span><RawFd> { |
| <span class="kw">let </span>fd = path.with_nix_path(|cstr| { |
| <span class="kw">unsafe </span>{ libc::open(cstr.as_ptr(), oflag.bits(), mode.bits() <span class="kw">as </span>c_uint) } |
| })<span class="question-mark">?</span>; |
| |
| Errno::result(fd) |
| } |
| |
| <span class="comment">// The conversion is not identical on all operating systems. |
| </span><span class="attribute">#[allow(clippy::useless_conversion)] |
| #[cfg(not(target_os = <span class="string">"redox"</span>))] |
| </span><span class="kw">pub fn </span>openat<P: <span class="question-mark">?</span>Sized + NixPath>( |
| dirfd: RawFd, |
| path: <span class="kw-2">&</span>P, |
| oflag: OFlag, |
| mode: Mode, |
| ) -> <span class="prelude-ty">Result</span><RawFd> { |
| <span class="kw">let </span>fd = path.with_nix_path(|cstr| { |
| <span class="kw">unsafe </span>{ libc::openat(dirfd, cstr.as_ptr(), oflag.bits(), mode.bits() <span class="kw">as </span>c_uint) } |
| })<span class="question-mark">?</span>; |
| Errno::result(fd) |
| } |
| |
| <span class="attribute">#[cfg(not(target_os = <span class="string">"redox"</span>))] |
| </span><span class="kw">pub fn </span>renameat<P1: <span class="question-mark">?</span>Sized + NixPath, P2: <span class="question-mark">?</span>Sized + NixPath>( |
| old_dirfd: <span class="prelude-ty">Option</span><RawFd>, |
| old_path: <span class="kw-2">&</span>P1, |
| new_dirfd: <span class="prelude-ty">Option</span><RawFd>, |
| new_path: <span class="kw-2">&</span>P2, |
| ) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span>res = old_path.with_nix_path(|old_cstr| { |
| new_path.with_nix_path(|new_cstr| <span class="kw">unsafe </span>{ |
| libc::renameat( |
| at_rawfd(old_dirfd), |
| old_cstr.as_ptr(), |
| at_rawfd(new_dirfd), |
| new_cstr.as_ptr(), |
| ) |
| }) |
| })<span class="question-mark">??</span>; |
| Errno::result(res).map(drop) |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(target_os = <span class="string">"linux"</span>, target_env = <span class="string">"gnu"</span>,))] |
| #[cfg(feature = <span class="string">"fs"</span>)] |
| </span><span class="macro">libc_bitflags! </span>{ |
| <span class="attribute">#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"fs"</span>)))] |
| </span><span class="kw">pub struct </span>RenameFlags: u32 { |
| RENAME_EXCHANGE; |
| RENAME_NOREPLACE; |
| RENAME_WHITEOUT; |
| } |
| } |
| |
| <span class="macro">feature! </span>{ |
| <span class="attribute">#![feature = <span class="string">"fs"</span>] |
| #[cfg(all( |
| target_os = <span class="string">"linux"</span>, |
| target_env = <span class="string">"gnu"</span>, |
| ))] |
| </span><span class="kw">pub fn </span>renameat2<P1: <span class="question-mark">?</span>Sized + NixPath, P2: <span class="question-mark">?</span>Sized + NixPath>( |
| old_dirfd: <span class="prelude-ty">Option</span><RawFd>, |
| old_path: <span class="kw-2">&</span>P1, |
| new_dirfd: <span class="prelude-ty">Option</span><RawFd>, |
| new_path: <span class="kw-2">&</span>P2, |
| flags: RenameFlags, |
| ) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span>res = old_path.with_nix_path(|old_cstr| { |
| new_path.with_nix_path(|new_cstr| <span class="kw">unsafe </span>{ |
| libc::renameat2( |
| at_rawfd(old_dirfd), |
| old_cstr.as_ptr(), |
| at_rawfd(new_dirfd), |
| new_cstr.as_ptr(), |
| flags.bits(), |
| ) |
| }) |
| })<span class="question-mark">??</span>; |
| Errno::result(res).map(drop) |
| } |
| |
| <span class="kw">fn </span>wrap_readlink_result(<span class="kw-2">mut </span>v: Vec<u8>, len: ssize_t) -> <span class="prelude-ty">Result</span><OsString> { |
| <span class="kw">unsafe </span>{ v.set_len(len <span class="kw">as </span>usize) } |
| v.shrink_to_fit(); |
| <span class="prelude-val">Ok</span>(OsString::from_vec(v.to_vec())) |
| } |
| |
| <span class="kw">fn </span>readlink_maybe_at<P: <span class="question-mark">?</span>Sized + NixPath>( |
| dirfd: <span class="prelude-ty">Option</span><RawFd>, |
| path: <span class="kw-2">&</span>P, |
| v: <span class="kw-2">&mut </span>Vec<u8>, |
| ) -> <span class="prelude-ty">Result</span><libc::ssize_t> { |
| path.with_nix_path(|cstr| <span class="kw">unsafe </span>{ |
| <span class="kw">match </span>dirfd { |
| <span class="attribute">#[cfg(target_os = <span class="string">"redox"</span>)] |
| </span><span class="prelude-val">Some</span>(<span class="kw">_</span>) => <span class="macro">unreachable!</span>(), |
| <span class="attribute">#[cfg(not(target_os = <span class="string">"redox"</span>))] |
| </span><span class="prelude-val">Some</span>(dirfd) => libc::readlinkat( |
| dirfd, |
| cstr.as_ptr(), |
| v.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>c_char, |
| v.capacity() <span class="kw">as </span>size_t, |
| ), |
| <span class="prelude-val">None </span>=> libc::readlink( |
| cstr.as_ptr(), |
| v.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>c_char, |
| v.capacity() <span class="kw">as </span>size_t, |
| ), |
| } |
| }) |
| } |
| |
| <span class="kw">fn </span>inner_readlink<P: <span class="question-mark">?</span>Sized + NixPath>(dirfd: <span class="prelude-ty">Option</span><RawFd>, path: <span class="kw-2">&</span>P) -> <span class="prelude-ty">Result</span><OsString> { |
| <span class="kw">let </span><span class="kw-2">mut </span>v = Vec::with_capacity(libc::PATH_MAX <span class="kw">as </span>usize); |
| <span class="comment">// simple case: result is strictly less than `PATH_MAX` |
| </span><span class="kw">let </span>res = readlink_maybe_at(dirfd, path, <span class="kw-2">&mut </span>v)<span class="question-mark">?</span>; |
| <span class="kw">let </span>len = Errno::result(res)<span class="question-mark">?</span>; |
| <span class="macro">debug_assert!</span>(len >= <span class="number">0</span>); |
| <span class="kw">if </span>(len <span class="kw">as </span>usize) < v.capacity() { |
| <span class="kw">return </span>wrap_readlink_result(v, res); |
| } |
| <span class="comment">// Uh oh, the result is too long... |
| // Let's try to ask lstat how many bytes to allocate. |
| </span><span class="kw">let </span>reported_size = <span class="kw">match </span>dirfd { |
| <span class="attribute">#[cfg(target_os = <span class="string">"redox"</span>)] |
| </span><span class="prelude-val">Some</span>(<span class="kw">_</span>) => <span class="macro">unreachable!</span>(), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] |
| </span><span class="prelude-val">Some</span>(dirfd) => { |
| <span class="kw">let </span>flags = <span class="kw">if </span>path.is_empty() { AtFlags::AT_EMPTY_PATH } <span class="kw">else </span>{ AtFlags::empty() }; |
| <span class="kw">super</span>::sys::stat::fstatat(dirfd, path, flags | AtFlags::AT_SYMLINK_NOFOLLOW) |
| }, |
| <span class="attribute">#[cfg(not(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>, target_os = <span class="string">"redox"</span>)))] |
| </span><span class="prelude-val">Some</span>(dirfd) => <span class="kw">super</span>::sys::stat::fstatat(dirfd, path, AtFlags::AT_SYMLINK_NOFOLLOW), |
| <span class="prelude-val">None </span>=> <span class="kw">super</span>::sys::stat::lstat(path) |
| } |
| .map(|x| x.st_size) |
| .unwrap_or(<span class="number">0</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>try_size = <span class="kw">if </span>reported_size > <span class="number">0 </span>{ |
| <span class="comment">// Note: even if `lstat`'s apparently valid answer turns out to be |
| // wrong, we will still read the full symlink no matter what. |
| </span>reported_size <span class="kw">as </span>usize + <span class="number">1 |
| </span>} <span class="kw">else </span>{ |
| <span class="comment">// If lstat doesn't cooperate, or reports an error, be a little less |
| // precise. |
| </span>(libc::PATH_MAX <span class="kw">as </span>usize).max(<span class="number">128</span>) << <span class="number">1 |
| </span>}; |
| <span class="kw">loop </span>{ |
| v.reserve_exact(try_size); |
| <span class="kw">let </span>res = readlink_maybe_at(dirfd, path, <span class="kw-2">&mut </span>v)<span class="question-mark">?</span>; |
| <span class="kw">let </span>len = Errno::result(res)<span class="question-mark">?</span>; |
| <span class="macro">debug_assert!</span>(len >= <span class="number">0</span>); |
| <span class="kw">if </span>(len <span class="kw">as </span>usize) < v.capacity() { |
| <span class="kw">break </span>wrap_readlink_result(v, res); |
| } <span class="kw">else </span>{ |
| <span class="comment">// Ugh! Still not big enough! |
| </span><span class="kw">match </span>try_size.checked_shl(<span class="number">1</span>) { |
| <span class="prelude-val">Some</span>(next_size) => try_size = next_size, |
| <span class="comment">// It's absurd that this would happen, but handle it sanely |
| // anyway. |
| </span><span class="prelude-val">None </span>=> <span class="kw">break </span><span class="prelude-val">Err</span>(Errno::ENAMETOOLONG), |
| } |
| } |
| } |
| } |
| |
| <span class="kw">pub fn </span>readlink<P: <span class="question-mark">?</span>Sized + NixPath>(path: <span class="kw-2">&</span>P) -> <span class="prelude-ty">Result</span><OsString> { |
| inner_readlink(<span class="prelude-val">None</span>, path) |
| } |
| |
| <span class="attribute">#[cfg(not(target_os = <span class="string">"redox"</span>))] |
| </span><span class="kw">pub fn </span>readlinkat<P: <span class="question-mark">?</span>Sized + NixPath>(dirfd: RawFd, path: <span class="kw-2">&</span>P) -> <span class="prelude-ty">Result</span><OsString> { |
| inner_readlink(<span class="prelude-val">Some</span>(dirfd), path) |
| } |
| |
| <span class="doccomment">/// Computes the raw fd consumed by a function of the form `*at`. |
| </span><span class="attribute">#[cfg(not(target_os = <span class="string">"redox"</span>))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>at_rawfd(fd: <span class="prelude-ty">Option</span><RawFd>) -> raw::c_int { |
| <span class="kw">match </span>fd { |
| <span class="prelude-val">None </span>=> libc::AT_FDCWD, |
| <span class="prelude-val">Some</span>(fd) => fd, |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>, target_os = <span class="string">"freebsd"</span>))] |
| #[cfg(feature = <span class="string">"fs"</span>)] |
| </span><span class="macro">libc_bitflags!</span>( |
| <span class="doccomment">/// Additional flags for file sealing, which allows for limiting operations on a file. |
| </span><span class="attribute">#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"fs"</span>)))] |
| </span><span class="kw">pub struct </span>SealFlag: c_int { |
| <span class="doccomment">/// Prevents further calls to `fcntl()` with `F_ADD_SEALS`. |
| </span>F_SEAL_SEAL; |
| <span class="doccomment">/// The file cannot be reduced in size. |
| </span>F_SEAL_SHRINK; |
| <span class="doccomment">/// The size of the file cannot be increased. |
| </span>F_SEAL_GROW; |
| <span class="doccomment">/// The file contents cannot be modified. |
| </span>F_SEAL_WRITE; |
| } |
| ); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"fs"</span>)] |
| </span><span class="macro">libc_bitflags!</span>( |
| <span class="doccomment">/// Additional configuration flags for `fcntl`'s `F_SETFD`. |
| </span><span class="attribute">#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"fs"</span>)))] |
| </span><span class="kw">pub struct </span>FdFlag: c_int { |
| <span class="doccomment">/// The file descriptor will automatically be closed during a successful `execve(2)`. |
| </span>FD_CLOEXEC; |
| } |
| ); |
| |
| <span class="macro">feature! </span>{ |
| <span class="attribute">#![feature = <span class="string">"fs"</span>] |
| |
| #[cfg(not(target_os = <span class="string">"redox"</span>))] |
| #[derive(Debug, Eq, Hash, PartialEq)] |
| #[non_exhaustive] |
| </span><span class="kw">pub enum </span>FcntlArg<<span class="lifetime">'a</span>> { |
| F_DUPFD(RawFd), |
| F_DUPFD_CLOEXEC(RawFd), |
| F_GETFD, |
| F_SETFD(FdFlag), <span class="comment">// FD_FLAGS |
| </span>F_GETFL, |
| F_SETFL(OFlag), <span class="comment">// O_NONBLOCK |
| </span>F_SETLK(<span class="kw-2">&</span><span class="lifetime">'a </span>libc::flock), |
| F_SETLKW(<span class="kw-2">&</span><span class="lifetime">'a </span>libc::flock), |
| F_GETLK(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>libc::flock), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"linux"</span>, target_os = <span class="string">"android"</span>))] |
| </span>F_OFD_SETLK(<span class="kw-2">&</span><span class="lifetime">'a </span>libc::flock), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"linux"</span>, target_os = <span class="string">"android"</span>))] |
| </span>F_OFD_SETLKW(<span class="kw-2">&</span><span class="lifetime">'a </span>libc::flock), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"linux"</span>, target_os = <span class="string">"android"</span>))] |
| </span>F_OFD_GETLK(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>libc::flock), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>, target_os = <span class="string">"freebsd"</span>))] |
| </span>F_ADD_SEALS(SealFlag), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>, target_os = <span class="string">"freebsd"</span>))] |
| </span>F_GET_SEALS, |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"macos"</span>, target_os = <span class="string">"ios"</span>))] |
| </span>F_FULLFSYNC, |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"linux"</span>, target_os = <span class="string">"android"</span>))] |
| </span>F_GETPIPE_SZ, |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"linux"</span>, target_os = <span class="string">"android"</span>))] |
| </span>F_SETPIPE_SZ(c_int), |
| <span class="comment">// TODO: Rest of flags |
| </span>} |
| |
| <span class="attribute">#[cfg(target_os = <span class="string">"redox"</span>)] |
| #[derive(Debug, Clone, Copy, Eq, Hash, PartialEq)] |
| #[non_exhaustive] |
| </span><span class="kw">pub enum </span>FcntlArg { |
| F_DUPFD(RawFd), |
| F_DUPFD_CLOEXEC(RawFd), |
| F_GETFD, |
| F_SETFD(FdFlag), <span class="comment">// FD_FLAGS |
| </span>F_GETFL, |
| F_SETFL(OFlag), <span class="comment">// O_NONBLOCK |
| </span>} |
| <span class="kw">pub use </span><span class="self">self</span>::FcntlArg::<span class="kw-2">*</span>; |
| |
| <span class="comment">// TODO: Figure out how to handle value fcntl returns |
| </span><span class="kw">pub fn </span>fcntl(fd: RawFd, arg: FcntlArg) -> <span class="prelude-ty">Result</span><c_int> { |
| <span class="kw">let </span>res = <span class="kw">unsafe </span>{ |
| <span class="kw">match </span>arg { |
| F_DUPFD(rawfd) => libc::fcntl(fd, libc::F_DUPFD, rawfd), |
| F_DUPFD_CLOEXEC(rawfd) => libc::fcntl(fd, libc::F_DUPFD_CLOEXEC, rawfd), |
| F_GETFD => libc::fcntl(fd, libc::F_GETFD), |
| F_SETFD(flag) => libc::fcntl(fd, libc::F_SETFD, flag.bits()), |
| F_GETFL => libc::fcntl(fd, libc::F_GETFL), |
| F_SETFL(flag) => libc::fcntl(fd, libc::F_SETFL, flag.bits()), |
| <span class="attribute">#[cfg(not(target_os = <span class="string">"redox"</span>))] |
| </span>F_SETLK(flock) => libc::fcntl(fd, libc::F_SETLK, flock), |
| <span class="attribute">#[cfg(not(target_os = <span class="string">"redox"</span>))] |
| </span>F_SETLKW(flock) => libc::fcntl(fd, libc::F_SETLKW, flock), |
| <span class="attribute">#[cfg(not(target_os = <span class="string">"redox"</span>))] |
| </span>F_GETLK(flock) => libc::fcntl(fd, libc::F_GETLK, flock), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] |
| </span>F_OFD_SETLK(flock) => libc::fcntl(fd, libc::F_OFD_SETLK, flock), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] |
| </span>F_OFD_SETLKW(flock) => libc::fcntl(fd, libc::F_OFD_SETLKW, flock), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] |
| </span>F_OFD_GETLK(flock) => libc::fcntl(fd, libc::F_OFD_GETLK, flock), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>, target_os = <span class="string">"freebsd"</span>))] |
| </span>F_ADD_SEALS(flag) => libc::fcntl(fd, libc::F_ADD_SEALS, flag.bits()), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>, target_os = <span class="string">"freebsd"</span>))] |
| </span>F_GET_SEALS => libc::fcntl(fd, libc::F_GET_SEALS), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"macos"</span>, target_os = <span class="string">"ios"</span>))] |
| </span>F_FULLFSYNC => libc::fcntl(fd, libc::F_FULLFSYNC), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"linux"</span>, target_os = <span class="string">"android"</span>))] |
| </span>F_GETPIPE_SZ => libc::fcntl(fd, libc::F_GETPIPE_SZ), |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"linux"</span>, target_os = <span class="string">"android"</span>))] |
| </span>F_SETPIPE_SZ(size) => libc::fcntl(fd, libc::F_SETPIPE_SZ, size), |
| } |
| }; |
| |
| Errno::result(res) |
| } |
| |
| <span class="comment">// TODO: convert to libc_enum |
| </span><span class="attribute">#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)] |
| #[non_exhaustive] |
| </span><span class="kw">pub enum </span>FlockArg { |
| LockShared, |
| LockExclusive, |
| Unlock, |
| LockSharedNonblock, |
| LockExclusiveNonblock, |
| UnlockNonblock, |
| } |
| |
| <span class="attribute">#[cfg(not(target_os = <span class="string">"redox"</span>))] |
| </span><span class="kw">pub fn </span>flock(fd: RawFd, arg: FlockArg) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">use </span><span class="self">self</span>::FlockArg::<span class="kw-2">*</span>; |
| |
| <span class="kw">let </span>res = <span class="kw">unsafe </span>{ |
| <span class="kw">match </span>arg { |
| LockShared => libc::flock(fd, libc::LOCK_SH), |
| LockExclusive => libc::flock(fd, libc::LOCK_EX), |
| Unlock => libc::flock(fd, libc::LOCK_UN), |
| LockSharedNonblock => libc::flock(fd, libc::LOCK_SH | libc::LOCK_NB), |
| LockExclusiveNonblock => libc::flock(fd, libc::LOCK_EX | libc::LOCK_NB), |
| UnlockNonblock => libc::flock(fd, libc::LOCK_UN | libc::LOCK_NB), |
| } |
| }; |
| |
| Errno::result(res).map(drop) |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] |
| #[cfg(feature = <span class="string">"zerocopy"</span>)] |
| </span><span class="macro">libc_bitflags! </span>{ |
| <span class="doccomment">/// Additional flags to `splice` and friends. |
| </span><span class="attribute">#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"zerocopy"</span>)))] |
| </span><span class="kw">pub struct </span>SpliceFFlags: c_uint { |
| <span class="doccomment">/// Request that pages be moved instead of copied. |
| /// |
| /// Not applicable to `vmsplice`. |
| </span>SPLICE_F_MOVE; |
| <span class="doccomment">/// Do not block on I/O. |
| </span>SPLICE_F_NONBLOCK; |
| <span class="doccomment">/// Hint that more data will be coming in a subsequent splice. |
| /// |
| /// Not applicable to `vmsplice`. |
| </span>SPLICE_F_MORE; |
| <span class="doccomment">/// Gift the user pages to the kernel. |
| /// |
| /// Not applicable to `splice`. |
| </span>SPLICE_F_GIFT; |
| } |
| } |
| |
| <span class="macro">feature! </span>{ |
| <span class="attribute">#![feature = <span class="string">"zerocopy"</span>] |
| |
| </span><span class="doccomment">/// Copy a range of data from one file to another |
| /// |
| /// The `copy_file_range` system call performs an in-kernel copy between |
| /// file descriptors `fd_in` and `fd_out` without the additional cost of |
| /// transferring data from the kernel to user space and then back into the |
| /// kernel. It copies up to `len` bytes of data from file descriptor `fd_in` to |
| /// file descriptor `fd_out`, overwriting any data that exists within the |
| /// requested range of the target file. |
| /// |
| /// If the `off_in` and/or `off_out` arguments are used, the values |
| /// will be mutated to reflect the new position within the file after |
| /// copying. If they are not used, the relevant filedescriptors will be seeked |
| /// to the new position. |
| /// |
| /// On successful completion the number of bytes actually copied will be |
| /// returned. |
| </span><span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] |
| </span><span class="kw">pub fn </span>copy_file_range( |
| fd_in: RawFd, |
| off_in: <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>libc::loff_t>, |
| fd_out: RawFd, |
| off_out: <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>libc::loff_t>, |
| len: usize, |
| ) -> <span class="prelude-ty">Result</span><usize> { |
| <span class="kw">let </span>off_in = off_in |
| .map(|offset| offset <span class="kw">as </span><span class="kw-2">*mut </span>libc::loff_t) |
| .unwrap_or(ptr::null_mut()); |
| <span class="kw">let </span>off_out = off_out |
| .map(|offset| offset <span class="kw">as </span><span class="kw-2">*mut </span>libc::loff_t) |
| .unwrap_or(ptr::null_mut()); |
| |
| <span class="kw">let </span>ret = <span class="kw">unsafe </span>{ |
| libc::syscall( |
| libc::SYS_copy_file_range, |
| fd_in, |
| off_in, |
| fd_out, |
| off_out, |
| len, |
| <span class="number">0</span>, |
| ) |
| }; |
| Errno::result(ret).map(|r| r <span class="kw">as </span>usize) |
| } |
| |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"linux"</span>, target_os = <span class="string">"android"</span>))] |
| </span><span class="kw">pub fn </span>splice( |
| fd_in: RawFd, |
| off_in: <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>libc::loff_t>, |
| fd_out: RawFd, |
| off_out: <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>libc::loff_t>, |
| len: usize, |
| flags: SpliceFFlags, |
| ) -> <span class="prelude-ty">Result</span><usize> { |
| <span class="kw">let </span>off_in = off_in |
| .map(|offset| offset <span class="kw">as </span><span class="kw-2">*mut </span>libc::loff_t) |
| .unwrap_or(ptr::null_mut()); |
| <span class="kw">let </span>off_out = off_out |
| .map(|offset| offset <span class="kw">as </span><span class="kw-2">*mut </span>libc::loff_t) |
| .unwrap_or(ptr::null_mut()); |
| |
| <span class="kw">let </span>ret = <span class="kw">unsafe </span>{ libc::splice(fd_in, off_in, fd_out, off_out, len, flags.bits()) }; |
| Errno::result(ret).map(|r| r <span class="kw">as </span>usize) |
| } |
| |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"linux"</span>, target_os = <span class="string">"android"</span>))] |
| </span><span class="kw">pub fn </span>tee(fd_in: RawFd, fd_out: RawFd, len: usize, flags: SpliceFFlags) -> <span class="prelude-ty">Result</span><usize> { |
| <span class="kw">let </span>ret = <span class="kw">unsafe </span>{ libc::tee(fd_in, fd_out, len, flags.bits()) }; |
| Errno::result(ret).map(|r| r <span class="kw">as </span>usize) |
| } |
| |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"linux"</span>, target_os = <span class="string">"android"</span>))] |
| </span><span class="kw">pub fn </span>vmsplice( |
| fd: RawFd, |
| iov: <span class="kw-2">&</span>[std::io::IoSlice<<span class="lifetime">'_</span>>], |
| flags: SpliceFFlags |
| ) -> <span class="prelude-ty">Result</span><usize> |
| { |
| <span class="kw">let </span>ret = <span class="kw">unsafe </span>{ |
| libc::vmsplice( |
| fd, |
| iov.as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>libc::iovec, |
| iov.len(), |
| flags.bits(), |
| ) |
| }; |
| Errno::result(ret).map(|r| r <span class="kw">as </span>usize) |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"linux"</span>))] |
| #[cfg(feature = <span class="string">"fs"</span>)] |
| </span><span class="macro">libc_bitflags!</span>( |
| <span class="doccomment">/// Mode argument flags for fallocate determining operation performed on a given range. |
| </span><span class="attribute">#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"fs"</span>)))] |
| </span><span class="kw">pub struct </span>FallocateFlags: c_int { |
| <span class="doccomment">/// File size is not changed. |
| /// |
| /// offset + len can be greater than file size. |
| </span>FALLOC_FL_KEEP_SIZE; |
| <span class="doccomment">/// Deallocates space by creating a hole. |
| /// |
| /// Must be ORed with FALLOC_FL_KEEP_SIZE. Byte range starts at offset and continues for len bytes. |
| </span>FALLOC_FL_PUNCH_HOLE; |
| <span class="doccomment">/// Removes byte range from a file without leaving a hole. |
| /// |
| /// Byte range to collapse starts at offset and continues for len bytes. |
| </span>FALLOC_FL_COLLAPSE_RANGE; |
| <span class="doccomment">/// Zeroes space in specified byte range. |
| /// |
| /// Byte range starts at offset and continues for len bytes. |
| </span>FALLOC_FL_ZERO_RANGE; |
| <span class="doccomment">/// Increases file space by inserting a hole within the file size. |
| /// |
| /// Does not overwrite existing data. Hole starts at offset and continues for len bytes. |
| </span>FALLOC_FL_INSERT_RANGE; |
| <span class="doccomment">/// Shared file data extants are made private to the file. |
| /// |
| /// Gaurantees that a subsequent write will not fail due to lack of space. |
| </span>FALLOC_FL_UNSHARE_RANGE; |
| } |
| ); |
| |
| <span class="macro">feature! </span>{ |
| <span class="attribute">#![feature = <span class="string">"fs"</span>] |
| |
| </span><span class="doccomment">/// Manipulates file space. |
| /// |
| /// Allows the caller to directly manipulate the allocated disk space for the |
| /// file referred to by fd. |
| </span><span class="attribute">#[cfg(any(target_os = <span class="string">"linux"</span>))] |
| #[cfg(feature = <span class="string">"fs"</span>)] |
| </span><span class="kw">pub fn </span>fallocate( |
| fd: RawFd, |
| mode: FallocateFlags, |
| offset: libc::off_t, |
| len: libc::off_t, |
| ) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span>res = <span class="kw">unsafe </span>{ libc::fallocate(fd, mode.bits(), offset, len) }; |
| Errno::result(res).map(drop) |
| } |
| |
| <span class="doccomment">/// Argument to [`fspacectl`] describing the range to zero. The first member is |
| /// the file offset, and the second is the length of the region. |
| </span><span class="attribute">#[cfg(any(target_os = <span class="string">"freebsd"</span>))] |
| #[derive(Clone, Copy, Debug, Eq, PartialEq)] |
| </span><span class="kw">pub struct </span>SpacectlRange(<span class="kw">pub </span>libc::off_t, <span class="kw">pub </span>libc::off_t); |
| |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"freebsd"</span>))] |
| </span><span class="kw">impl </span>SpacectlRange { |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.<span class="number">1 </span>== <span class="number">0 |
| </span>} |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> libc::off_t { |
| <span class="self">self</span>.<span class="number">1 |
| </span>} |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>offset(<span class="kw-2">&</span><span class="self">self</span>) -> libc::off_t { |
| <span class="self">self</span>.<span class="number">0 |
| </span>} |
| } |
| |
| <span class="doccomment">/// Punch holes in a file. |
| /// |
| /// `fspacectl` instructs the file system to deallocate a portion of a file. |
| /// After a successful operation, this region of the file will return all zeroes |
| /// if read. If the file system supports deallocation, then it may free the |
| /// underlying storage, too. |
| /// |
| /// # Arguments |
| /// |
| /// - `fd` - File to operate on |
| /// - `range.0` - File offset at which to begin deallocation |
| /// - `range.1` - Length of the region to deallocate |
| /// |
| /// # Returns |
| /// |
| /// The operation may deallocate less than the entire requested region. On |
| /// success, it returns the region that still remains to be deallocated. The |
| /// caller should loop until the returned region is empty. |
| /// |
| /// # Example |
| /// |
| </span><span class="attribute">#[cfg_attr(fbsd14, doc = <span class="string">" ```"</span>)] |
| #[cfg_attr(not(fbsd14), doc = <span class="string">" ```no_run"</span>)] |
| </span><span class="doccomment">/// # use std::io::Write; |
| /// # use std::os::unix::fs::FileExt; |
| /// # use std::os::unix::io::AsRawFd; |
| /// # use nix::fcntl::*; |
| /// # use tempfile::tempfile; |
| /// const INITIAL: &[u8] = b"0123456789abcdef"; |
| /// let mut f = tempfile().unwrap(); |
| /// f.write_all(INITIAL).unwrap(); |
| /// let mut range = SpacectlRange(3, 6); |
| /// while (!range.is_empty()) { |
| /// range = fspacectl(f.as_raw_fd(), range).unwrap(); |
| /// } |
| /// let mut buf = vec![0; INITIAL.len()]; |
| /// f.read_exact_at(&mut buf, 0).unwrap(); |
| /// assert_eq!(buf, b"012\0\0\0\0\0\09abcdef"); |
| /// ``` |
| </span><span class="attribute">#[cfg(target_os = <span class="string">"freebsd"</span>)] |
| </span><span class="kw">pub fn </span>fspacectl(fd: RawFd, range: SpacectlRange) -> <span class="prelude-ty">Result</span><SpacectlRange> { |
| <span class="kw">let </span><span class="kw-2">mut </span>rqsr = libc::spacectl_range{r_offset: range.<span class="number">0</span>, r_len: range.<span class="number">1</span>}; |
| <span class="kw">let </span>res = <span class="kw">unsafe </span>{ libc::fspacectl( |
| fd, |
| libc::SPACECTL_DEALLOC, <span class="comment">// Only one command is supported ATM |
| </span><span class="kw-2">&</span>rqsr, |
| <span class="number">0</span>, <span class="comment">// No flags are currently supported |
| </span><span class="kw-2">&mut </span>rqsr |
| )}; |
| Errno::result(res).map(|<span class="kw">_</span>| SpacectlRange(rqsr.r_offset, rqsr.r_len)) |
| } |
| |
| <span class="doccomment">/// Like [`fspacectl`], but will never return incomplete. |
| /// |
| /// # Arguments |
| /// |
| /// - `fd` - File to operate on |
| /// - `offset` - File offset at which to begin deallocation |
| /// - `len` - Length of the region to deallocate |
| /// |
| /// # Returns |
| /// |
| /// Returns `()` on success. On failure, the region may or may not be partially |
| /// deallocated. |
| /// |
| /// # Example |
| /// |
| </span><span class="attribute">#[cfg_attr(fbsd14, doc = <span class="string">" ```"</span>)] |
| #[cfg_attr(not(fbsd14), doc = <span class="string">" ```no_run"</span>)] |
| </span><span class="doccomment">/// # use std::io::Write; |
| /// # use std::os::unix::fs::FileExt; |
| /// # use std::os::unix::io::AsRawFd; |
| /// # use nix::fcntl::*; |
| /// # use tempfile::tempfile; |
| /// const INITIAL: &[u8] = b"0123456789abcdef"; |
| /// let mut f = tempfile().unwrap(); |
| /// f.write_all(INITIAL).unwrap(); |
| /// fspacectl_all(f.as_raw_fd(), 3, 6).unwrap(); |
| /// let mut buf = vec![0; INITIAL.len()]; |
| /// f.read_exact_at(&mut buf, 0).unwrap(); |
| /// assert_eq!(buf, b"012\0\0\0\0\0\09abcdef"); |
| /// ``` |
| </span><span class="attribute">#[cfg(target_os = <span class="string">"freebsd"</span>)] |
| </span><span class="kw">pub fn </span>fspacectl_all(fd: RawFd, offset: libc::off_t, len: libc::off_t) |
| -> <span class="prelude-ty">Result</span><()> |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>rqsr = libc::spacectl_range{r_offset: offset, r_len: len}; |
| <span class="kw">while </span>rqsr.r_len > <span class="number">0 </span>{ |
| <span class="kw">let </span>res = <span class="kw">unsafe </span>{ libc::fspacectl( |
| fd, |
| libc::SPACECTL_DEALLOC, <span class="comment">// Only one command is supported ATM |
| </span><span class="kw-2">&</span>rqsr, |
| <span class="number">0</span>, <span class="comment">// No flags are currently supported |
| </span><span class="kw-2">&mut </span>rqsr |
| )}; |
| Errno::result(res)<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="attribute">#[cfg(any( |
| target_os = <span class="string">"linux"</span>, |
| target_os = <span class="string">"android"</span>, |
| target_os = <span class="string">"emscripten"</span>, |
| target_os = <span class="string">"fuchsia"</span>, |
| target_os = <span class="string">"wasi"</span>, |
| target_env = <span class="string">"uclibc"</span>, |
| target_os = <span class="string">"freebsd" |
| </span>))] |
| </span><span class="kw">mod </span>posix_fadvise { |
| <span class="kw">use </span><span class="kw">crate</span>::errno::Errno; |
| <span class="kw">use </span>std::os::unix::io::RawFd; |
| <span class="kw">use </span><span class="kw">crate</span>::Result; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"fs"</span>)] |
| </span><span class="macro">libc_enum! </span>{ |
| <span class="attribute">#[repr(i32)] |
| #[non_exhaustive] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"fs"</span>)))] |
| </span><span class="kw">pub enum </span>PosixFadviseAdvice { |
| POSIX_FADV_NORMAL, |
| POSIX_FADV_SEQUENTIAL, |
| POSIX_FADV_RANDOM, |
| POSIX_FADV_NOREUSE, |
| POSIX_FADV_WILLNEED, |
| POSIX_FADV_DONTNEED, |
| } |
| } |
| |
| <span class="macro">feature! </span>{ |
| <span class="attribute">#![feature = <span class="string">"fs"</span>] |
| </span><span class="kw">pub fn </span>posix_fadvise( |
| fd: RawFd, |
| offset: libc::off_t, |
| len: libc::off_t, |
| advice: PosixFadviseAdvice, |
| ) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span>res = <span class="kw">unsafe </span>{ libc::posix_fadvise(fd, offset, len, advice <span class="kw">as </span>libc::c_int) }; |
| |
| <span class="kw">if </span>res == <span class="number">0 </span>{ |
| <span class="prelude-val">Ok</span>(()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(Errno::from_i32(res)) |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(any( |
| target_os = <span class="string">"linux"</span>, |
| target_os = <span class="string">"android"</span>, |
| target_os = <span class="string">"dragonfly"</span>, |
| target_os = <span class="string">"emscripten"</span>, |
| target_os = <span class="string">"fuchsia"</span>, |
| target_os = <span class="string">"wasi"</span>, |
| target_os = <span class="string">"freebsd" |
| </span>))] |
| </span><span class="kw">pub fn </span>posix_fallocate(fd: RawFd, offset: libc::off_t, len: libc::off_t) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span>res = <span class="kw">unsafe </span>{ libc::posix_fallocate(fd, offset, len) }; |
| <span class="kw">match </span>Errno::result(res) { |
| <span class="prelude-val">Err</span>(err) => <span class="prelude-val">Err</span>(err), |
| <span class="prelude-val">Ok</span>(<span class="number">0</span>) => <span class="prelude-val">Ok</span>(()), |
| <span class="prelude-val">Ok</span>(errno) => <span class="prelude-val">Err</span>(Errno::from_i32(errno)), |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="nix" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
