HP-UX Reference (11i v2 03/08) - 5 Miscellaneous Topics, 7 Device (Special) Files, 9 General Information, Index (vol 9)

iomap(7) iomap(7)

[ENODEV] Read and write calls are unsupported.

[ENXIO] No such device at the address speciﬁed by the minor number.

[ENOSPC] Required resources for mapping could not be allocated.

[ENOTTY] Inappropriate ioctl request for this device type; ﬁldes is not a ﬁle descriptor for an

iomap device ﬁle.

EXAMPLES

Consider the following code fragment:

#include <sys/iomap.h>

...

int fildes;

void *addr;

...

addr = REQUESTED_ADDRESS;

(void) ioctl(fildes, IOMAPMAP, &addr);

(void) printf("actual address = 0x%x\n", addr);

where fildes is an open ﬁle descriptor for the device special ﬁle and

REQUESTED_ADDRESS

is the

address originally requested by the program.

addr is a null pointer, the system selects a suitable address then returns the selected address in addr.

If the value in addr is not a null pointer, it is used as a speciﬁed address for allocating memory. If the

speciﬁed address cannot be used, an error is returned (see

ERRORS).