Although the logging facility has many strengths, it does
have a drawback; it requires six arguments after the format
string -- even if the arguments aren't used. This makes the
function slightly annoying to use. To make it appear more
printf-like, seven macros have been defined. These
macros take the form
logMsgn(fmt, arg1, arg2,
..., argn) where n indicates how many
of the six trailing arguments there are. If only the format
string is to be displayed,
logMsg0(fmt) can be used.
The macros append a newline to the format string, so it not necessary to specify one.
If a task with an ID of 0x123456 and a name 'tMyTask' makes the call:
logMsg1("The system call returned %d", errno);
the message log will get the following entry:
0x123456 (tMyTask): The system call returned 0