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Low-Level I/O CPROGRAMMERS ON GNU/LINUX
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| 13.03.2010, 14:09 |
The Linux kernel itself provides another set of I/O operations that operate at a
lower level than the C library functions.
Because this book is for people who already know the C language, we’ll assume
that you have encountered and know how to use the C library I/O functions.
Often there are good reasons to use Linux’s low-level I/O functions. Many of these
are kernel system calls2 and provide the most direct access to underlying system capa-
bilities that is available to application programs. In fact, the standard C library I/O
routines are implemented on top of the Linux low-level I/O system calls. Using the
latter is usually the most efficient way to perform input and output operations—and is
sometimes more convenient, too.
1.The C++ standard library provides iostreams with similar functionality.The standard C
library is also available in the C++ language.
2. See Chapter 8,"Linux System Calls,” for an explanation of the difference between a system
call and an ordinary function call.
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Категория: Книги по ОС Linux | Добавил: ssipk
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