![]() The user often does not even know or care what type of UART is in use.Ĭlassic Unix systems often provide two different device nodes (or minor numbers) for serial I/O hardware. The low-level driver not only maps the device into the file system with the help of the kernel, it also encapsulates the particular hardware. high-level C libraries for controlling the device.the standard system call for controlling a device, and/or. ![]() ![]() the standard system calls for opening, reading, writing, and closing the device, and.low-level drivers for mapping the device into the file system ( /dev and/or /device/ file system entries),.As such, programs usually don't, and are usually not allowed to, access hardware resources like serial UARTs directly. Linux, or any Unix, is a multi-user, multi-tasking operating system. Together with this overview it should be possible to implement programs doing serial I/O under Unix. The relevant man pages are not too great a read, but they are usually complete in their listing of options and parameters. Version's manual (man pages) when programming for a serial device in Unix. It is highly recommended that you study a particular Unix Therefore, this module just provides a general outline. These APIs are not discussed here.Īctual implementations of classic Unix serial APIs do vary in practice, due to the different versions of Unix and its clones, like Linux. Some Unix versions ship additional vendor-specific proprietary high-level APIs. And, in fact they are also the highest abstraction in C on standard Unix. Nevertheless, these APIs are the lowest level of abstraction one can find for serial I/O in Unix. ![]() Languages other than C might provide appropriate wrappers to these APIs which look similar, or come with their own abstraction (e.g. This page is about the classic Unix C APIs for controlling serial devices. ![]() The Classic Unix C APIs for Serial Communication Introduction Scope 1 The Classic Unix C APIs for Serial Communication. ![]()
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