USB鼠标的灯闪烁了一下,并且似乎重启了(因为鼠标之前没反应)
命令:sudo ./usbreset /dev/bus/usb/003/001
结果:
Resetting USB device /dev/bus/usb/003/001
Error in ioctl: Is a directory
/dev/bus/usb/003/001 是一个root_hub,实际上它插着一个USB鼠标
usbreset源程序:
代码： 全选
/* usbreset -- send a USB port reset to a USB device */
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <linux/usbdevice_fs.h>
int main(int argc, char **argv)
{
const char *filename;
int fd;
int rc;
if (argc != 2) {
fprintf(stderr, "Usage: usbreset device-filename\n");
return 1;
}
filename = argv[1];
fd = open(filename, O_WRONLY);
if (fd < 0) {
perror("Error opening output file");
return 1;
}
printf("Resetting USB device %s\n", filename);
rc = ioctl(fd, USBDEVFS_RESET, 0);
if (rc < 0) {
perror("Error in ioctl");
return 1;
}
printf("Reset successful\n");
close(fd);
return 0;
}
这也太复杂