ref: c28f07b5840216c4e83e1d3b21d8a9ed7c41f8f9 dir: /sys/src/ape/lib/ap/stdio/fileno.c/
/* * Posix stdio -- fileno */ #include "iolib.h" int fileno(FILE *f){ if(f==NULL) return -1; else return f->fd; }