On Fri Oct 1 15:25:16 EDT 2010, [email protected] wrote:
> how does kernel code call plan9 system calls, does it perform a
> trap from kernel back into kernel space and make the request just
> like a user process or is there a more direct, subtle route?
the short answer is that it doesn't. but read/write/open/close/stat
are done via channels, and often with Blocks. for example
(hopefully without typos)
c = namec("/sys/src/9/pc/mkfile", Aopen, OREAD, 0); /* can
call error */
b = devtab[c->type]->bread(c, 64*1024, 0);
/* b->wp points to data if successful BLEN(b) is the length */
- erik
