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18.2.4 setlogmask
-----------------
The symbols referred to in this section are declared in the file
'syslog.h'.
-- Function: int setlogmask (int MASK)
Preliminary: | MT-Unsafe race:LogMask | AS-Unsafe | AC-Safe | *Note
POSIX Safety Concepts::.
'setlogmask' sets a mask (the "logmask") that determines which
future 'syslog' calls shall be ignored. If a program has not
called 'setlogmask', 'syslog' doesn't ignore any calls. You can
use 'setlogmask' to specify that messages of particular priorities
shall be ignored in the future.
A 'setlogmask' call overrides any previous 'setlogmask' call.
Note that the logmask exists entirely independently of opening and
closing of Syslog connections.
Setting the logmask has a similar effect to, but is not the same
as, configuring Syslog. The Syslog configuration may cause Syslog
to discard certain messages it receives, but the logmask causes
certain messages never to get submitted to Syslog in the first
place.
MASK is a bit string with one bit corresponding to each of the
possible message priorities. If the bit is on, 'syslog' handles
messages of that priority normally. If it is off, 'syslog'
discards messages of that priority. Use the message priority
macros described in *note syslog; vsyslog:: and the 'LOG_MASK' to
construct an appropriate MASK value, as in this example:
LOG_MASK(LOG_EMERG) | LOG_MASK(LOG_ERROR)
or
~(LOG_MASK(LOG_INFO))
There is also a 'LOG_UPTO' macro, which generates a mask with the
bits on for a certain priority and all priorities above it:
LOG_UPTO(LOG_ERROR)
The unfortunate naming of the macro is due to the fact that
internally, higher numbers are used for lower message priorities.
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
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