919600d10b
Android always has `utimensat` available, so it is not necessary (or possible, for that matter) to emulate it. Mark the fallback path as `unreachable!()`.
61 lines
2.0 KiB
Rust
61 lines
2.0 KiB
Rust
//! This module consists of helper types and functions for dealing
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//! with setting the file times specific to Linux.
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use crate::filetime::FileTime;
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use crate::{cstr, from_success_code};
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use std::fs::File;
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use std::io::Result;
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use std::sync::atomic::{AtomicBool, Ordering::Relaxed};
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/// Wrapper for `utimensat` syscall, however, with an added twist such that `utimensat` symbol
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/// is firstly resolved (i.e., we check whether it exists on the host), and only used if that is
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/// the case. Otherwise, the syscall resorts to a less accurate `utimesat` emulated syscall.
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/// The original implementation can be found here: [filetime::unix::linux::set_times]
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///
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/// [filetime::unix::linux::set_times]: https://github.com/alexcrichton/filetime/blob/master/src/unix/linux.rs#L64
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pub fn utimensat(
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dirfd: &File,
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path: &str,
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atime: FileTime,
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mtime: FileTime,
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symlink_nofollow: bool,
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) -> Result<()> {
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use crate::filetime::to_timespec;
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use std::os::unix::prelude::*;
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let flags = if symlink_nofollow {
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libc::AT_SYMLINK_NOFOLLOW
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} else {
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0
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};
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// Attempt to use the `utimensat` syscall, but if it's not supported by the
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// current kernel then fall back to an older syscall.
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static INVALID: AtomicBool = AtomicBool::new(false);
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if !INVALID.load(Relaxed) {
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let path = cstr(path)?;
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let times = [to_timespec(&atime)?, to_timespec(&mtime)?];
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let res = from_success_code(unsafe {
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libc::syscall(
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libc::SYS_utimensat,
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dirfd.as_raw_fd(),
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path.as_ptr(),
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times.as_ptr(),
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flags,
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)
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});
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let err = match res {
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Ok(()) => return Ok(()),
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Err(e) => e,
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};
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if err.raw_os_error().unwrap() == libc::ENOSYS {
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INVALID.store(true, Relaxed);
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}
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return Err(err);
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}
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#[cfg(not(target_os = "android"))]
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return super::utimesat::utimesat(dirfd, path, atime, mtime, symlink_nofollow);
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#[cfg(target_os = "android")]
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unreachable!();
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}
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