open-libc-addr1 u1 – u2 gforth “open-lib”
lib-symc-addr1 u1 u2 – u3 gforth “lib-sym”
lib-error– c-addr u gforth “lib-error”
Error message for last failed
call-c... w – ... gforth “call-c”
Call the C function pointed to by w. The C function has to access the stack itself. The stack pointers are exported into a ptrpair structure passed to the C function, and returned in that form.