Data Transfer Entry Points

Data Transfer Entry Points

The pfxread() and pfxwrite() entry points are supported by character device drivers and pseudo-device drivers that allow reading and writing. They are called by the kernel when the user process calls the read(), readv(), write(), or writev() system function.

The pfxstrategy() entry point is required of block device drivers. It is called by the kernel when either a filesystem or the paging subsystem needs to transfer a block of data.

Entry Points read() and write()
Entry Point strategy()