我必须写一个气管,每24小时处理电离装置(不含BKL)功能。 此时,我可以从用户空间每小时的电离层指挥处那里得到一个论点。
__get_user(myint, (int __user *) arg);
我怎么能够接受多方面的gu口(例如这一呼吁):
ioctl(fp, SZ_NEW_DEV_FORMAT, 0, 1, 30);
我必须写一个气管,每24小时处理电离装置(不含BKL)功能。 此时,我可以从用户空间每小时的电离层指挥处那里得到一个论点。
__get_user(myint, (int __user *) arg);
我怎么能够接受多方面的gu口(例如这一呼吁):
ioctl(fp, SZ_NEW_DEV_FORMAT, 0, 1, 30);
是的,你必须使用结构。 某个特定地球指挥部将有一些预先确定的论点。 你需要将这些论点总结为结构标语,并在物体的地址上通过。 在主角旁边,你需要打上给定的rg子,以便组织点和接触这些论点。 例如。
struct mesg {
int size;
char buf[100];
};
struct mesg msg1;
/*Fill in the structure object here and call ioctl like this*/
ret = ioctl(fd, SZ_NEW_DEV_FORMAT, &msg1);
在座右翼旁边,你可以这样做:
struct mesg *msg;
copy_from_user((char *)msg, (char *)arg, sizeof(*msg));
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