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Elaborate in comment about `statx` probe 

As requested by @workingjubilee in
https://github.com/rust-lang/rust/pull/123928#discussion_r1564916743.
This commit is contained in:
Tobias Bucher 2024-04-27 18:36:29 +02:00
parent 61a1dbd751
commit adebad1dce
1 changed files with 4 additions and 8 deletions
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12
library/std/src/sys/pal/unix/fs.rs
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@ -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()