Plan 9 from Bell Labs’s /usr/web/sources/contrib/mycroftiv/old/rootlessboot/src9boot/printstub.c
#include <u.h> #include <libc.h> static Lock fmtl; void _fmtlock(void) { lock(&fmtl); } void _fmtunlock(void) { unlock(&fmtl); } int _efgfmt(Fmt*) { return -1; }