On Wed, 31 Jan 2024, Maciej Wieczor-Retman wrote:
> On 2024-01-26 at 10:58:04 -0800, Reinette Chatre wrote:
> >On 1/25/2024 4:14 AM, Ilpo Järvinen wrote:
> >> On Thu, 25 Jan 2024, Maciej Wieczor-Retman wrote:
> >
> >>> + fp = fopen(file_path, "r");
> >>> + if (!fp) {
> >>> + snprintf(reason, sizeof(reason), "Error in opening %s file\n", filename);
> >>> + ksft_perror(reason);
> >>
> >> Was this the conclusion of the kstf_perror() discussion with Reinette? I
> >> expected a bit different outcome when I stopped following it...
> >>
> >> In any case, it would be nice though if ksft_perror() (or some kselftest.h
> >> function yet to be added with a different name) would accept full printf
> >> interface and just add the errno string into the end of the string so one
> >> would not need to build constructs like this at all.
> >>
> >> It will require a bit of macro trickery into kselftest.h. I don't know how
> >> it should handle the case where somebody just passes a char pointer to it,
> >> not a string literal, but I guess it would just throw an error while
> >> compiling if somebody tries to do that as the macro string literal
> >> concatenation could not build useful/compilable token.
> >>
> >> It would make these prints informative enough to become actually useful
> >> without needed to resort to preparing the string in advance which seems
> >> to be required almost every single case with the current interface.
> >
> >I think this can be accomplished with a new:
> > void ksft_vprint_msg(const char *msg, va_list args)
> >
> >... but ksft_perror() does conform to perror() and I expect that having one
> >support variable number of arguments while the other does to cause confusion.
> >
> >To support variable number of arguments with errno I'd propose just to use
> >ksft_print_msg() with strerror(errno), errno as the arguments (or even %m
> >that that errno handling within ksft_print_msg() aims to support). This does
> >indeed seem to be the custom in other tests.
>
> Does something like this look okay?
>
> fp = fopen(file_path, "r");
> if (!fp) {
> ksft_print_msg("Error in opening %s\n: %m\n", file_path);
> return -1;
> }
>
> The '%m' seems to work fine but doesn't print errno's number code. Do you want
> me to add errno after '%m' so it is the same as ksft_perror()? I looked through
> some other tests where '%m' is used, and only few ones add errno with '%d'.
I think %m is enough.
--
i.
