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fix docs & example for FileExt::write_at

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darklyspaced 2023-07-20 11:27:13 +08:00
parent 39f42ad9e8
commit e7dc177442
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1 changed files with 8 additions and 1 deletions
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library/std/src/os/unix/fs.rs
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@ -149,7 +149,14 @@ fn read_exact_at(&self, mut buf: &mut [u8], mut offset: u64) -> io::Result<()> {
/// Note that similar to [`File::write`], it is not an error to return a
/// short write.
///
/// # Bug
/// On some systems, due to a [bug] with [`pwrite64`] (the underlying
/// syscall), files opened with the `O_APPEND` flag fail to respect the
/// offset parameter, always appending to the end of the file instead.
///
/// [`File::write`]: fs::File::write
/// [`pwrite64`]: https://man7.org/linux/man-pages/man2/pwrite.2.html
/// [bug]: https://man7.org/linux/man-pages/man2/pwrite.2.html#BUGS
///
/// # Examples
///
@ -159,7 +166,7 @@ fn read_exact_at(&self, mut buf: &mut [u8], mut offset: u64) -> io::Result<()> {
/// use std::os::unix::prelude::FileExt;
///
/// fn main() -> io::Result<()> {
/// let file = File::open("foo.txt")?;
/// let file = File::create("foo.txt")?;
///
/// // We now write at the offset 10.
/// file.write_at(b"sushi", 10)?;