On Fri, 22 Mar 2002, Dan Streetman wrote:
>I will send a second email containing a simple program to exercise
>this.
example usage:
<prog> /proc/bus/usb/001/005 -2
to disconnect interface number (not position) 2 from device 5 on HC 1
to connect,
<prog> /proc/bus/usb/001/005 2
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <linux/usbdevice_fs.h>
#define EXIT_ERR(err) do {\
printf("%s\n", strerror(err));\
printf("Usage :\n");\
printf(" %s <devnode> [-|+]<interface number>\n\n", argv[0]);\
printf(" Use negative interface number to disconnect, positive (default) to
connect.\n");\
return -err;\
} while(0)
#define CONNECT 1
#define DISCONNECT 2
int main( int argc, char *argv[] )
{
struct usbdevfs_ioctl *connect_ioctl;
int iface_num, fd, mode;
char *devnode, **endptr;
char *modestr, *disconnect = "disconnect", *connect = "connect";
if (argc != 3)
EXIT_ERR( EINVAL );
if (!(endptr = malloc(sizeof(*endptr))))
EXIT_ERR( ENOMEM );
if (!(connect_ioctl = malloc(sizeof(*connect_ioctl)))) {
free(endptr);
EXIT_ERR( ENOMEM );
}
devnode = argv[1];
mode = CONNECT;
if ('-' == argv[2][0])
mode = DISCONNECT;
errno = 0;
iface_num = strtol( argv[2], endptr, 10 );
if (errno)
EXIT_ERR( errno );
if (*endptr == argv[2])
EXIT_ERR( EINVAL );
free(endptr);
modestr = mode == DISCONNECT ? disconnect : connect;
connect_ioctl->ifno = abs( iface_num );
connect_ioctl->ioctl_code = mode == DISCONNECT ? USBDEVFS_DISCONNECT :
USBDEVFS_CONNECT;
connect_ioctl->data = NULL;
errno = 0;
if (0 > (fd = open( devnode, O_RDWR )))
EXIT_ERR( errno );
errno = 0;
if (ioctl( fd, USBDEVFS_IOCTL, connect_ioctl )) {
fprintf( stderr, "Could not %s interface %d : %s\n", modestr, connect_ioctl->ifno,
strerror( errno ) );
free(connect_ioctl);
return -errno;
}
printf( "%sed interface %d\n", modestr, connect_ioctl->ifno );
if ( CONNECT == mode )
printf( " (Connecting always succeeds)\n" );
free(connect_ioctl);
return 0;
}
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