ref: a2ebe5c79a45a0f9ed35bbb690f5070cdfded3ad
dir: /sys/src/9/boot/boot.h/
enum { Debug = 0, }; extern void fatal(char*); extern int readfile(char*, char*, int); extern void run(char*, ...); extern void setenv(char*, char*, int); extern int writefile(char*, char*, int);