[PARPORT] ioctl

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I´ve installed a kernel 2.4.x. Now, I try to open and
read the parallel port but it fails.

fd=open("/dev/parport0", O_RDONLY|O_NOCTTY);
mode=IEEE1284_MODE_ECP;

ioctl(fd,PPCLAIM);

ioctl(fd,PPNEGOT,&mode);

ioctl(fd,PPSETMODE,&mode);

The second ioctl (PPNEGOT) returns errno=5 (Input /
Output error) and the third ioctl doesn't do anything
and the program gets blocked. Any idea?

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