Re: where can find S_fsys_startup?

[funfire@eyou.com]

Thank you!
I know more about hurd with your letter.
I am confused by MIG and the code produced by MIG.
It make the way more longer and harder to who want to hack hurd.
Why use it?

>funfire@eyou.com writes:
>
>> I am hacking hurd recently. And I found a lot of functions were easy to
get
>> their declarations,but difficult get their source code .
>> When I read source code in directory "hurd/trans", I am puzzled so much
how
>> the function S_fsys_startup was implemented ?
>
>As a general rule, lots of functions are implemented by libraries.
>For MiG server functions (that's what the S_ prefix means) they are
>often given special names indicating the library, like
>diskfs_S_fsys_startup (in libdiskfs/fsys-startup.c) or
>trivfs_S_fsys_startup (in libtrivfs/fsys-stubs.c).
>
>However, fsys_startup is a curiously unusual RPC.  This is the RPC
>that newly starting filesystems call to their parent to "hook into"
>the rest of the filesystem hierarchy.  Filesystems are normally
>started with the help of the function fshelp_start_translator_long in
>libfshelp/start-trans-long.c.  If you look, you will see that it
>doesn't use MiG to process this RPC at all.
>
>So most implementations of fsys_startup are just stubs, and what
>matters is hidden inside fshelp_start_translator_long.  
>
>The one exception (in libdiskfs/fsys-startup.c) is for bootstrapping,
>where it happens that the normal MiG stub is used to dispatch the
>fsys_startup RPC that the initial exec server makes, which is all
>really happening in libdiskfs/boot-start.c.  This is because the first
>execserver translator is not actually started through
>fshelp_start_translator_long, but is instead loaded and started by the
>bootstrapping program.
>
>Thomas
>
>
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