User friendly error messages from errno

[dhardy]

Is there a way to get user-friendly messages (static str or other) from errno numbers? I can't see anything except to refer to the table in cloudabi.txt:209.

For comparison, see from_raw_os_error which uses sys::os::error_string, which uses strerror_r internally. It looks like CloudABI error codes don't match up with POSIX error codes so will you provide an equivalent?

[m-ou-se]

Cloudlibc provides a strerror and strerror_r: https://github.com/NuxiNL/cloudlibc/blob/master/src/include/string.h#L71-L73

[EdSchouten]

Hi Diggory,

It's safe to pass error codes from the Rust bindings to from_raw_os_error(). On CloudABI, that function is also implemented using strerror(). Inside of CloudABI's C library we ensure that the error codes are defined to match up with the ones from cloudabi.txt:

https://github.com/NuxiNL/cloudlibc/blob/master/src/libc/errno/errno.c

That said, maybe there is some elegant way to expose documentation strings in cloudabi.txt through the Rust bindings as well...? @m-ou-se thoughts?

[dhardy]

Thanks for the quick response. I have no problem using from_raw_os_error in that case so I guess this is just a documentation issue.