linux - Pass param to USB ioctl -

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i have problem read/write data usb mass storage device, 'device or resource busy' error below command:

ioctl(usbfd, usbdevfs_claiminterface, &interface_num)

so need release interface before. don't know how can pass interface_num correctly command:

ioctl(usbfd, usbdevfs_releaseinterface, &interface_num),

if it's not defined, there function found interface number. please me! thanks.

the documentation states:

usbdevfs_releaseinterface

this used release claim usbfs made on interface, either implicitly or because of usbdevfs_claiminterface call, before file descriptor closed. ioctl parameter integer holding number of interface (binterfacenumber descriptor); file modification time not updated request.

but seems here "parameter integer" still means pointer integer should passed, you're showing. if have descriptor, can find interface number.


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