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int addseverity(int severity, const char *s);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
This function allows the introduction of new severity classes which can
be addressed by the severity argument of the fmtmsg(3) function. By
default that latter function only knows how to print messages for
severity 0-4 (with strings (none), HALT, ERROR, WARNING, INFO). This
call attaches the given string s to the given value severity. If s is
NULL, the severity class with the numeric value severity is removed.
It is not possible to overwrite or remove one of the default severity
classes. The severity value must be nonnegative.
Upon success, the value MM_OK is returned. Upon error, the return
value is MM_NOTOK. Possible errors include: out of memory, attempt to
remove a nonexistent or default severity class.
addseverity() is provided in glibc since version 2.1.
This function is not specified in the X/Open Portability Guide although
the fmtmsg(3) function is. It is available on System V systems.
New severity classes can also be added by setting the environment vari-
GNU 2008-06-14 ADDSEVERITY(3)