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Chapter 3 - Low-Level I/O Routines

UNIX Systems Programming for SVR4
David A. Curry
 Copyright © 1996 O'Reilly & Associates, Inc.

Chapter 3: Low-Level I/O Routines
Overview
The C language, unlike PASCAL or FORTRAN, does not provide any built-in operators for performing input and output (I/O). Rather, all I/O services are offered to the programmer directly by the operating system, in the form of system calls and library routines.
This chapter examines the I/O interface provided by all versions of UNIX, including SVR4. All of the functions described in this chapter, except for readv and writev, are specified by the POSIX 1003.1 standard.
The routines described in this chapter are usually referred to as the low-level I/O interface, because they are a direct interface to the operating system and, to some extent, the hardware itself. The next chapter discusses a high-level interface, the Standard I/O Library.

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