DOKK / manpages / debian 11 / libixp-dev / ixp_printfcall.3.en
IXP_PRINTFCALL(3) Library Functions Manual IXP_PRINTFCALL(3)

ixp_printfcall

#include <ixp.h>
void     (*ixp_printfcall)(IxpFcall*);

When set to a non-null value, ixp_printfcall is called once for every incoming and outgoing Fcall. It is intended to simplify the writing of debugging code for clients, but may be used for any arbitrary purpose.

ixp_respond(3), ixp_serve9conn(3)

2012 Dec libixp Manual