addseverity - introduce new severity classes
int addseverity(int severity, const char *s);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.19:
Glibc 2.19 and earlier:
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 function knows only 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.
For an explanation of the terms used in this section, see attributes(7).
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 variable
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