lkml.org 
[lkml]   [2018]   [Nov]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v1 2/2] signal: add procfd_signal() syscall
On Mon, Nov 19, 2018 at 3:07 PM Tycho Andersen <tycho@tycho.ws> wrote:
> > These tools also care about ioctls. Adding a system call is a pain,
> > but the solution is to make adding system calls less of a pain, not to
> > permanently make the Linux ABI worse.
>
> For user-defined values of "worse" :)
>

I tend to agree with Tycho here. But I'm wondering if it might be
worth considering a better ioctl.

/me dons flame-proof hat

We could do:

long better_ioctl(int fd, u32 nr, const void *inbuf, size_t inlen,
const void *outbuf, size_t outlen);

and have a central table in the kernel listing all possible nr values
along with which driver they belong to. We could have a sane
signature and get rid of the nr collision problem.

The major problem I see is that u32 isn't really enough to have a sane
way to allow out-of-tree drivers to use this, and that we can't
readily use anything bigger than u32 without indirection because we're
out of syscall argument space.

\
 
 \ /
  Last update: 2018-11-20 01:28    [W:0.101 / U:0.092 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site