c - Minix keyboard Driver -

i'm trying change keyboard driver in minix, idea store in file characters used introduced in keyboard.i declare global file * fp , insert piece of code in /usr/src/drivers/tty/keyboard.c

while (icount > 0) {          scode = *itail++;      /* take 1 key scan code */           if (itail == ibuf + kb_in_bytes) itail = ibuf;           icount--;            /* function keys being used debug dumps. */           if (func_key(scode)) continue;             /* perform make/break processing. */            ch = make_break(scode);             if (ch <= 0xff) {                   /* normal character. */                    fp = fopen("log.txt","a+");                   fprint(fp,"%c",ch);                   fclose(fp);                     buf[0] = ch;                    (void) in_process(tp, buf, 1);           } else ... 

then run "make" in directory , reboot not work. mean, file not created. idea?

this won't work. keyboard driver inside tty "driver", service in charge of console. fs/vfs transmit i/o requests concerning console tty. fopen, fprint, , fclose in code ways perform such requests. vfs can handle requests "user" programs (and transmit them down drivers); tty not "user" program, , such, not allowed perform i/o requests.