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which is nowadays supported by glibc.
.pp
the user of
.br getrandom ()
.i must
always check the return value,
to determine whether either an error occurred
or fewer bytes than requested were returned.
in the case where
.b grnd_random
is not specified and
.i buflen
is less than or equal to 256,
a return of fewer bytes than requested should never happen,
but the careful programmer will check for this anyway!
.sh bugs
as of linux 3.19, the following bug exists:
.\" fixme patch proposed https://lkml.org/lkml/2014/11/29/16
.ip * 3
depending on cpu load,
.br getrandom ()
does not react to interrupts before reading all bytes requested.
.sh see also
.br getentropy (3),
.br random (4),
.br urandom (4),
.br random (7),
.br signal (7)
.sh colophon
this page is part of release 5.13 of the linux
.i man-pages
project.
a description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
\%https://www.kernel.org/doc/man\-pages/.
.\" copyright 2002 walter harms ([email protected])
.\"
.\" %%%license_start(gpl_noversion_oneline)
.\" distributed under gpl
.\" %%%license_end
.\" adapted glibc info page
.\"
.\" polished a little, aeb
.th addseverity 3 2021-03-22 "gnu" "linux programmer's manual"
.sh name
addseverity \- introduce new severity classes
.sh synopsis
.nf
.pp
.b #include <fmtmsg.h>
.pp
.bi "int addseverity(int " severity ", const char *" s );
.fi
.pp
.rs -4
feature test macro requirements for glibc (see
.br feature_test_macros (7)):
.re
.pp
.br addseverity ():
.nf
since glibc 2.19:
_default_source
glibc 2.19 and earlier:
_svid_source
.fi
.sh description
this function allows the introduction of new severity classes
which can be addressed by the
.i severity
argument of the
.br 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
.i s
to the given value
.ir severity .
if
.i s
is null, the severity class with the numeric value
.i severity
is removed.
it is not possible to overwrite or remove one of the default
severity classes.
the severity value must be nonnegative.
.sh return value
upon success, the value
.b mm_ok
is returned.
upon error, the return value is
.br mm_notok .
possible errors include: out of memory, attempt to remove a
nonexistent or default severity class.
.sh versions