Hi,

MTIOCGET doesn't work for me. The following program fails with "Invalid argument":

struct mtget smtget;
...
tape_fd = open("/dev/rmt0.1", O_RDONLY);

if (tape_fd == -1) {
    perror("open");
    exit(1);
}

rc = ioctl(tape_fd, MTIOCGET, &smtget);

if (!rc) {
    perror("ioctl");
    exit(1);
}

MTIOCTOP on the other hand works. However, sys/mtio.h has all the MTIOCGET stuff so what's the trick?

Hi Jack,

This seems to be your exact problem:

https://stackoverflow.com/questions/57927360/how-to-fix-invalid-argument-for-ioctl-requests-to-block-device

Regards,

Henrik Morsing

> This seems to be your exact problem
True, but this is Linux. AIX doesn't have the sg stuff and running MTNOP fails as well.

So what's the "official" way of getting the current tape position with AIX?