The Software Developer's Guide to Linux by David Cohen / Christian Sturm

Author:David Cohen / Christian Sturm
Language: eng
Format: epub
Tags: COM046070 - COMPUTERS / Operating Systems / Linux, COM015000 - COMPUTERS / Security / Viruses & Malware, COM043000 - COMPUTERS / Networking / General
Publisher: Packt
Published: 2024-01-23T11:07:03+00:00

These first three file descriptors function as standard communication channels to (and from) a process. As a result, they exist in the same order for every process created on the system. The first always points to a file which will be used to read in input. The second points to a file that will be used for writing output. And the third references a file that will receive error output.

Optionally, after those first three standard file descriptors, there can be any number of other file descriptors/handles, based on what the program is doing. Your process could have:

Files it’s working with

Sockets it’s reading from or writing to (think Unix or TCP sockets being written to for networking)

Devices like keyboards or disks it needs to use

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