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Re: wrappers for multiplexed syscalls (was Re: glibc at the Toolchains microconference at LPC 2019)
On Fri, Jun 28, 2019 at 5:35 PM Florian Weimer <fweimer@redhat.com> wrote:
>
> * Dmitry V. Levin:
>
> > What if we start adding separate functions for new interfaces of already
> > existing multiplexed system call wrappers?
> >
> > For example, ptrace is going to gain a new command (PTRACE_GET_SYSCALL_INFO)
> > in Linux 5.3. My initial plan was just to update sys/ptrace.h with a new
> > constant and bits/ptrace-shared.h with a new structure, but I could add
> > a new function as well:
> >
> > extern int ptrace_get_syscall_info (__pid_t __pid,
> > struct __ptrace_syscall_info *__infop)
> > __THROW;
>
> I think this makes a lot of sense. We should also do this for existing
> constants (and for fcntl, too). Perhaps after we have added more of the
> wrappers that are *completely* missing, though.
Yeah, I like this idea as well. I think we should keep exposing the
multiplexed interfaces, though, just because sometimes they do add new
opcodes (e.g. the OFD locks).
zw