Re: [musl] About the glibc libresolv vs musl network resolver routines signature

[Rich Felker <dalias@libc.org>]

On Fri, Oct 23, 2020 at 05:25:44PM +0800, 纳兰融雪 wrote:
> I work with any third party code written with glic, and I need
> compile and run it in a musl runtime.The code use `res_ninit`, but I
> cloud not find it in musl's resolv.h file.I noticed that glibc use
> `res_ninit`, `res_nclose`, `res_nquery`, etc, and marked `res_init`,
> `res_query`, etc as deprecated, but musl still using the old
> signature.I'm wondering:- How do I compile the code that use the
> `res_ninit` routine signature?- Is there a standard for the sinature
> for `resolv.h` (/usr/include/resolv.h)?- Will musl will use the new
> `res_ninit` glibc current using or the `res_init` style still?

resolv.h defines the __RES version macro to indicate the API level
provided, and its meaning is consistent across different libcs. __RES
>= 19991006 indicates support for the res_n* functions. musl's
resolver is stateless and does not have them, and defines __RES
appropriately to indicate that it doesn't.

Rich