[Development] QLog ( Work on qDebug and friends)

Thiago Macieira thiago.macieira at intel.com
Tue Feb 21 11:12:36 CET 2012

On terça-feira, 21 de fevereiro de 2012 10.02.23, kai.koehne at nokia.com wrote:
> So how about adding another QtMsgType called QLogMsg, that qLog() uses? In
> contrast to qDebug/QtDebugMsg, qLog/QtLogMsg messages would not be
> processed by default, unless the configuration file (or an environment
> variable) says so ...

That's almost a necessity. An informative message is not debugging.

>From sys/syslog.h:
#define LOG_EMERG       0       /* system is unusable */
#define LOG_ALERT       1       /* action must be taken immediately */
#define LOG_CRIT        2       /* critical conditions */
#define LOG_ERR         3       /* error conditions */
#define LOG_WARNING     4       /* warning conditions */
#define LOG_NOTICE      5       /* normal but significant condition */
#define LOG_INFO        6       /* informational */
#define LOG_DEBUG       7       /* debug-level messages */

We don't have EMERG and ALERT because Qt applications (often) aren't system 
applications and can't cause those conditions. And we don't have NOTICE or 
INFO because our message output was designed only for developer usage (from 
developers to other developers).

That also reminds me: some systems would benefit from having our message output 
go to syslog. MeeGo had a patch that I wrote a long time ago that sent all 
messages to syslog.

Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
     Intel Sweden AB - Registration Number: 556189-6027
     Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
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