Webmakes an IOCTL to the kernel module with the file descriptor and size so that the kernel module can get the struct page with find_get_page(). Then the kernel module calls dma_map_single(page_address(page)) for NIC, which concludes the datapath. The allocated memory may (significantly) outlive the originating userspace application. Web4 mrt. 2024 · On Android Platform the Ioctl can be submitted, but on Linux I get a bad address error. The programcode is shown below. There are more ioctls called on the …

why the ioctl return an error bad address when i try to ctrol an pci ...

WebParameter Description s The socket descriptor. cmd The command to perform. arg Points to the data associated with cmd. The operations to be controlled are determined by cmd.The arg parameter points to data associated with the particular command, and its format depends on the command being requested. The following keywords are valid ioctl() … Web3 mei 2013 · 点击(此处)折叠或打开 #include #include # dynamic axis in tableau

ioctl() - 装置の制御

WebAre you trying to write a byte? Are you trying to set the current address? Are you trying to do a current address read operation? Note that each read() and write() calls will … Web10 mei 2012 · the cmd PLX_IOCTL_CHIP_TYPE_GET is used to get the chip type of the pci device.It's defined in the PlxIoctl.h.(I used the PLX SDK to compile my pci driver)The … Web10 jun. 2024 · Re: ioctl(): Bad file descriptor Fri Jun 10, 2024 9:26 am Your spi_init looks OK - if it is returning normally without hitting pabort() then the open() is successful. dynamic axis label tableau