7.25.5.1 Error Redirection Mechanics

Declaring the actual error reported reference holder as:

    struct x1f4_track_type *eport;

the error reporter definition as:

    struct x1f4_track_type plain;

and its proxy as:

    struct x1f4_track_type track;

the methods of the latter will defer to those of the actual error reporter, whose address they will pick from eport.

See struct x1f4_track_type.

The line method recorded by track could be written as:

static int
line(void *context)
{
    int status;
    struct x1f4_track_type *track_data;

    track_data = *(struct x1f4_track_type **) context;
    if (track_data->line) {
	status = track_data->line(track_data->data);
    } else {
	status = 0;
    }

    return status;
}

The rest of the track recorded methods would be defined in a similar fashion.

Alternatively, the x1f4_rule_eproxy function may be used to set the method fields in track to the same effect.

See x1f4_rule_eproxy.

In the above example, the eport reference recorder is picked from the context field of the track struct x1f4_track_type definition, where it is set as:

    track.data = &eport;

with eport set as:

    eport = &plain;

The trap library object constructor will be introduced the actual error reported reference recorder like:

    struct x1f4_lxtrap_type lxtrap;

...

    lxtrap.reporter_set.track = &eport;

See struct x1f4_lxtrap_type.

See Trap Library Generation Flags.