.\" This man page is Copyright (C) 2012 Lennert Buytenhek.
.\" Permission is granted to distribute possibly modified copies
.\" of this page provided the header is included verbatim,
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.TH iv_fatal 3 2012-06-18 "ivykis" "ivykis programmer's manual"
.SH NAME
iv_fatal, iv_set_fatal_msg_handler \- ivykis fatal error condition handling
.SH SYNOPSIS
.B #include <iv.h>
.sp
.BI "void iv_fatal(const char *" "fmt" ", ...);"
.br
.BI "void iv_set_fatal_msg_handler(void (*" "handler" ")(const char *" "msg" "));"
.br
.SH DESCRIPTION
.B iv_fatal
aborts the running program, after possibly emitting an error
message. The
.B fmt
parameter is a
.BR printf (3)-style
format string, the message to be logged.
.PP
If no handler is set (the default), the formatted message will be sent
to
.BR syslog ,
with critical severity. Otherwise the
.B handler
as set by
.B iv_set_fatal_msg_handler
will be used instead.
.PP
.B iv_fatal
is also used internally by ivykis, whenever a fatal situation is
detected.
.PP
.B iv_set_fatal_msg_handler
can be used to set an alternative (as opposed to
.BR syslog )
function to call from
.BR iv_fatal ,
and its argument should be a function that does not return, and takes
a single string as argument \- the formatted error message.
.SH "SEE ALSO"
.BR ivykis (3),
.BR iv_examples (3)