ref: 3f5a4e9f7e3c0d1e7c43d2974049e2eb7bc7b5a0 dir: /sys/src/libstdio/fileno.c/
/* * Posix stdio -- fileno */ #include "iolib.h" int fileno(FILE *f){ if(f==NULL) return -1; else return f->fd; }