#include <ggi/ggi.h> void ggiPanic(const char *format, ...);
ggiPanic should only be used by usermode programs when something is really screwed, and they do not know what to do. The same applies for libraries, but might be used in rare situations such as corruption of critical data structures.
if (my_important_struct->magic != MAGIC) { ggiPanic("Fatal error: structure is corrupted\n"); }