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Describe ISC_LOG_DEBUGONLY.

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Fixed some examples.

Updated the colon-space bit of categories/modules; they are no longer used.

Fixed a couple of minor typos.
This commit is contained in:
David Lawrence 2000-03-01 17:38:39 +00:00
parent 7fe1fdea0d
commit ed301acd34
1 changed files with 18 additions and 13 deletions
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31
doc/design/logging
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@ -139,7 +139,7 @@ applies to redefinitions of the predefined channels, with one
exception: redefining default_stderr will change the default
destination of messages, as explained in more detail in a few paragraphs.
Channels can additionally have any of four options associated with
Channels can additionally have any of five options associated with
them. The following options are listed in the order which their
corresponding print strings appear in a log message:
@ -148,9 +148,16 @@ corresponding print strings appear in a log message:
ISC_LOG_PRINTMODULE -- The module name.
ISC_LOG_PRINTLEVEL -- The level.
You can set all four of those options with ISC_LOG_PRINTALL.
Syslog channels do not need ISC_LOG_PRINTTIME, but it is usally a good
idea for file and file descriptor feeds.
The additional option does not affect formatting. It is
ISC_LOG_DEBUGONLY, and marks a channel as only being eligible for
messages when the debugging level is non-zero. It acts like the
null channel when the debugging level is zero.
Now with these objects -- the category, module, and channel -- you can
actually direct messages to your desired destinations. As shown in
the next section, you associate the category/module pair with a
@ -216,7 +223,7 @@ associated with a particular category but you know the one you want to
shut up. Because of this, it is likely that specifying a null
destination _will_ block other channels that also specify a particular
category/module pair, but the exact mechanism has not yet been
determine.
determined.
No attempt is made to filter out duplicate destinations, so it is
certainly possible to define things such that a single log gets more
@ -279,8 +286,8 @@ descriptor log, and syslog.
&destination, ISC_LOG_PRINTTIME) != ISC_R_SUCCESS)
oops_it_didnt_work();
destination.facility = LOG_ERR
if (isc_log_createchannel(lctx, "sample2" ISC_LOG_SYSLOG, ISC_LOG_ERROR,
destination.facility = LOG_ERR;
if (isc_log_createchannel(lctx, "sample3" ISC_LOG_SYSLOG, ISC_LOG_ERROR,
&destination, 0) != ISC_R_SUCCESS)
oops_it_didnt_work();
@ -321,7 +328,8 @@ category."
6) If you are sending any messages to syslog, call
isc_log_opensyslog(). Currently the arguments to this function are
exactly the same as to syslog's openlog() function, but it is expected
that this will change. This is necessary
that this will change when the logging library is made to work with the
system logging facility on Windows NT.
isc_log_opensyslog(NULL, LOG_PID, LOG_DAEMON);
@ -376,14 +384,14 @@ logging system internally.
#include <dns/log.h>
isc_logcategory_t dns_categories[] = {
{ "dns_general: ", 0 },
{ "dns_database: ", 0 },
{ "dns_security: ", 0 },
{ "dns_general", 0 },
{ "dns_database", 0 },
{ "dns_security", 0 },
{ NULL, 0 }
};
isc_logmodule_t dns_modules[] = {
{ "db: ", 0 },
{ "rbtdb: ", 0 },
{ "db", 0 },
{ "rbtdb", 0 },
{ NULL, 0 }
};
@ -433,9 +441,6 @@ like isc_result_totext(result) and dns_result_totext(result).
THINGS I AM NOT KEEN ABOUT
The category/module names passed into the registration functions need
to have a colon-space (": ") at the end of each name.
I am not happy that using a null channel for a category/module pair
has no effect on other associations with that pair. It seems to me
that it would be nice to say "send all DATABASE category messages to