ioctl 是用来设置硬件控制寄存器,或者读取硬件状态寄存器的数值之类的。 而read,write 是把数据丢入缓冲区,硬件的驱动从缓冲区读取数据一个个发送或者把接收的数据送入缓冲区。 FIONREAD就是返回缓冲区中有多少字节; ioctl(keyFd, FIONREAD, &b)得到缓冲区里有多少字节要被读取,然后将字节数放入b里面。 接下来就可...
How can I call ioctl for interface list, or other ioctl stuff, on Free Pascal? 1 Where can i find __ioctl? 9 How Linux knows which ioctl function to call? 2 How to get access to ioctl() 3 What is the purpose of ioctl set of functions in linux? 2 Why is ioctl call not passe...
* fd: 读取RTC时钟的fd **/voidcloseRTC(intfd) {/*关闭 RTC 时钟计时*/ioctl(fd, RTC_PIE_OFF,0);/*关闭 RTC 装置*/close(fd); }/*使用ioctl的情况下的,计时器函数*/intrtcTimer(intmillseconds,intfd) {intloopNum =CALC_CNT(millseconds); unsignedlongdata =0;for(inti =0; i < loopNum; ...
Here is my code for the call to ioctl: ioctl is not a standard C function. Please ask in comp.unix.progr ammer. -- /-- Joona Palaste (pa***@cc.hel sinki.fi) --- Finland ---\ \-- http://www.helsinki.fi/~palaste --- rules! ---/ "The question of copying music from th...
ioctl I/O 总控制函数_sysctl 读 / 写系统参数acct 启用或禁止进程记账getrlimit 获取系统资源上限setrlimit 设置系统资源上限getrusage 获取系统资源使用情况uselib 选择要使用的二进制函数库ioperm 设置端口 I/O 权限iopl 改变进程 I/O 权限级别outb 低级端口操作reboot 重新启动swapon 打开交换文件和设备swapoff ...
void example(void) { printf("This is function:%s", __func__); } 8.特殊属性声明 G...
When I make the ioctl call it returns the error FileNotFoundError: [Errno 2] No such file or directory even though the file does exist and I have permission to access it since I have the permissions in the C code which runs fine. Changing other parts of the function li...
(*unlocked_ioctl)(struct file*,unsigned int,unsigned long);11long(*compat_ioctl)(struct file*,unsigned int,unsigned long);12int(*mmap)(struct file*,struct vm_area_struct*);13int(*open)(struct inode*,struct file*);14int(*flush)(struct file*,fl_owner_t id);15int(*release)(struct ...
The ioctl() interface has many uses. The POSIX.1 committee did not standardize the ioctl() interface because the last argument ca not be type-checked (its type depends upon the request). Instead, the committee broke out certain pieces of functionality and assigned them to other interfaces....