Re: [PATCH v2] Add public function syscall_no_errno

[Szabolcs Nagy <szabolcs.nagy@arm.com>]

The 02/08/2024 18:02, Askar Safin wrote:
> Add public function syscall_no_errno. Linux-specific. It is the same as syscall,
> but it doesn't interpret value, returned by Linux. So it is
> okay for issuing syscalls, such as SYS_getuid. Example:
> 
> #define _GNU_SOURCE
> #include <stdio.h>
> #include <unistd.h>
> #include <sys/syscall.h>
> 
> int
> main ()
> {
>   long int rc;
>   rc = syscall_no_errno(SYS_getuid);
>   printf("uid = %ld\n", rc);
> }
> 

the commit message has to explain why this is added
and how do we expect users to use this api.

it has to address why do we care about this use-case
more than the long list of other cases on linux that
don't work with the existing syscall api.

the patch needs tests for the new api.

i think the variadic nature of syscall and the libc vs
linux type differences are problematic enough that we
should discourage its use with or without errno.