Re: [PATCH 2/4] libtraceevent: Add logs with severity info

[Steven Rostedt <rostedt@goodmis.org>]

On Wed, 5 May 2021 07:45:44 +0300
Tzvetomir Stoyanov <tz.stoyanov@gmail.com> wrote:

> On Tue, May 4, 2021 at 11:24 PM Steven Rostedt <rostedt@goodmis.org> wrote:
> >
> > On Wed, 28 Apr 2021 10:29:59 +0300
> > "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com> wrote:
> >
> > And let the tep_vprint() decide to print it or not.  
> 
> The tep_vprint() is used also by libtacecmd and libtracefs for
> printing logs. Each library has its own log_level local variable,
> that's why I check the log level in the library specific log
> functions.

But tep_vprint() looks like this:

int __weak tep_vprint(const char *name, enum tep_loglevel level, const char *fmt, va_list ap)
{
        int ret = errno;

        if (errno && level <= TEP_LOG_WARNING)
                perror(name);

        fprintf(stderr, "  ");
        vfprintf(stderr, fmt, ap);
        fprintf(stderr, "\n");

        return ret;
}

That check of the log level is confusing. Just remove it. In fact, we
should add a boolean on whether to print the errno message or not.

Like this:

int __weak tep_vprint(const char *name, bool print_errno, const char *fmt, va_list ap)
{
        int ret = errno;

        if (errno && print_errno)
                perror(name);

        fprintf(stderr, "  ");
        vfprintf(stderr, fmt, ap);
        fprintf(stderr, "\n");

        return ret;
}

That would make a lot more sense, and let the callers of it decide to
print it or not, and not have the internal level of libtraceevent
decide.

-- Steve