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Thank you, Szabolcs.

But as I understand, libc has dependency on os's api, and musl is desi= gned target for linux, right? Why musl provide a set of header files withou= t directly use user header files from linux?
I also wonde= r by current solution for musl, how to keep alignment with kernel, I mean i= f linux changes some in uapi, would musl have to make the corresponding cha= nges to catch up with it? 
Doesn't it look better &nbs= p;to directly use linux uapi header files?


=0A=

=0A=
Best Regards

Wang Che= n
=0A=
 
Date: 2020-= 11-02 16:04
CC: musl
Subject: Re: [musl] [Que= stion] somequestions about kernel header files for musl=EF=BC=9F
* Chen Wang <unicorn_wang@outlook.com> [2020-11-02 1= 5:44:38 +0800]:
=0A=
> hi, I'm a newbie learning msul, I have some questions about kerne= l header files for musl. Appreciated if anybody can answer my quesitons, th= anks in adv.
=0A=
>
=0A=
> Q1) What's the rule to pick up kernel header files for musl? Do w= e need to catch up the latest kernel when the kernel is upgraded? What vers= ion of kernel is musl currently in usage?
=0A=
 
=0A=
musl can be built without linux headers.
=0A=
 
=0A=
you can use whatever linux version to build your toolchain,
=0A=
but recent ones (e.g. linux v5.*) will have less issues when
=0A=
libc and linux headers are included together in some code.
=0A=
 
=0A=
> Q2) I see duplicated headers files in different folders, for exam= ple: unistd.h, I see it under both "include/unistd.h" and "s= rc/include/unistd.h". Why we need multiple copies? Are they used for d= ifferent purpose?
=0A=
 
=0A=
src/* is musl internal, it is only used for building musl.
=0A=
 
=0A=
> Q3) For different arch, such as arm/x86/riscv, do they share the = same kernel header files? I double checked android bionic and found it has = different kernel header files for differnet arch.
=0A=
 
=0A=
musl does not use linux headers. it uses its own
=0A=
target specific definitions see arch/*/bits/*.h,
=0A=
an installed header set is only valid for one arch
=0A=
because the bits/ directory is arch specific.
=0A=
 
=0A=
linux headers are similar: different targets cannot
=0A=
share the same headers because the asm/ directory
=0A=
is arch specific.
=0A=
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