...
    base = 0x378;
    if (ioperm(base, LPSIZE, 1) < 0) {
            fprintf(stderr, "%s: ioperm:%s ", devname, strerror(errno));
            RETVAL = -1;
    } else {
            RETVAL = base;
    }

##</code><code>##

    EINVAL Invalid address(-range).
    EPERM  The calling process has insufficient privilege.
    ENOMEM Out of memory.
    EIO    This call is not supported (on PowerPC).

##</code><code>##

[   61.718702] parport_pc 00:0b: reported by Plug and Play ACPI
[   61.718797] parport0: PC-style at 0x378, irq 7 [PCSPP,TRISTATE]
[   63.870838] lp0: using parport0 (interrupt-driven).