Contents • • • • • • • • • • • • • • • • • • • • • • • • • • • • The Classic Unix C APIs for Serial Communication [ ] Introduction [ ] Scope [ ] This page is about the classic Unix C APIs for controlling serial devices. Profilo Storico Della Letteratura Italiana Pdf Printer. Languages other than C might provide appropriate wrappers to these APIs which look similar, or come with their own abstraction (e.g. Nevertheless, these APIs are the lowest level of abstraction one can find for serial I/O in Unix. And, in fact they are also the highest abstraction in C on standard Unix. Some Unix versions ship additional vendor-specific proprietary high-level APIs. These APIs are not discussed here. Actual implementations of classic Unix serial APIs do vary in practice, due to the different versions of Unix and its clones, like Linux.

Therefore, this module just provides a general outline. It is highly recommended that you study a particular Unix version's manual (man pages) when programming for a serial device in Unix. Canon Kh20x6 4 Krs Manual High School. The relevant man pages are not too great a read, but they are usually complete in their listing of options and parameters. Together with this overview it should be possible to implement programs doing serial I/O under Unix. Basics [ ] Linux, or any Unix, is a multi-user, multi-tasking operating system. As such, programs usually don't, and are usually not allowed to, access hardware resources like serial UARTs directly. Instead, the operating system provides • low-level drivers for mapping the device into the file system ( /dev and/or /device/ file system entries), • the standard system calls for opening, reading, writing, and closing the device, and • the standard system call for controlling a device, and/or • high-level C libraries for controlling the device.