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Elaborate in comment about statx probe #124443

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Apr 27, 2024
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Elaborate in comment about statx probe #124443

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12 changes: 4 additions & 8 deletions library/std/src/sys/pal/unix/fs.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -198,20 +198,16 @@ cfg_has_statx! {{
return Some(Err(err));
}

// `ENOSYS` might come from a faulty FUSE driver.
//
// Other errors are not a good enough indicator either -- it is
// known that `EPERM` can be returned as a result of using seccomp to
// block the syscall.
// We're not yet entirely sure whether `statx` is usable on this kernel
// or not. Syscalls can return errors from things other than the kernel
// per se, e.g. `EPERM` can be returned if seccomp is used to block the
// syscall, or `ENOSYS` might be returned from a faulty FUSE driver.
//
// Availability is checked by performing a call which expects `EFAULT`
// if the syscall is usable.
//
// See: https://github.com/rust-lang/rust/issues/65662
//
// FIXME this can probably just do the call if `EPERM` was received, but
// previous iteration of the code checked it for all errors and for now
// this is retained.
// FIXME what about transient conditions like `ENOMEM`?
let err2 = cvt(statx(0, ptr::null(), 0, libc::STATX_ALL, ptr::null_mut()))
.err()
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