Excellent Employment Development tutorial-Proficient in UNIX C programming and project practice

　　

The current development tools of the software industry, from C to C + +, from Java to. NET, new architecture, new components, the knowledge that today just learned, perhaps tomorrow is outdated. In order to gain a foothold in the fierce competition, in the knowledge explosion to keep up with the pace of the times, software developers generally have two ways to respond:

1. Crazy learning, daily evil to fill new knowledge to adapt to the needs of knowledge development.

2. Lay the foundation, choose a relatively stable platform and a relatively stable development language, status quo.

Under UNIX C language programming is a relatively stable development platform under the development language, mastered it, it can easily complete the current UNIX server crazy growth of a variety of functional requirements.

Why Choose UNIX Programming

In the Industrial field, UNIX has a wide range of applications, with more stable server performance, higher resource utilization and easier maintenance for UNIX systems. The reasons for choosing UNIX programming are as follows:

1. UNIX is the best support solution for today's large and medium enterprise applications

Currently, banks, telecommunications, securities and other large database requirements of the UNIX operating system has been selected without exception. Is the reason for the existence of equipment here (these enterprises choose Large, medium, minicomputer generally only support manufacturers supporting the UNIX operating system), but on the other hand, and UNIX super-strong performance can not be divided.

UNIX operating system has the characteristics of security, stability and multi-user, which can give full play to the performance of the equipment, especially for the large network server and database server which have very high requirements for system performance, file I/O throughput, concurrency capability, security authentication, network throughput and transaction time, etc. such as today's popular online games, the subsequent server support is also preferred UNIX operating system.

2. Linux provides a premium cost-effective support solution for small business applications

The advent of Linux became possible for the X86 host to run UNIX, as well as providing high-quality application support solutions for small businesses. Servers that run Linux (or other Unix that supports X86) are also widely used in Web sites, small and medium-sized network games, and other application systems.

3. Unix time-sharing multi-user function greatly facilitates the host to share and remote maintenance

Unlike Windows's exclusive operating system, UNIX is a time-sharing multiuser system that allows multiple people to log on to the host simultaneously. Different users of a shared host are not affected by each other, as if each user were using their own separate host.

UNIX Network terminal remote login function for zero-distance maintenance provides the possibility that the maintenance personnel whenever and wherever, as long as there is a network, you can rely on the UNIX Telnet protocol or SSH support, with very few system resources to consume the landing host, really do the plotting, winning thousands outside.

Contents of UNIX Programming

The basic idea of C programming in UNIX is no different from ordinary C language programming, but it joins a lot of system calls and special application processing, the main contents are as follows:

1. File I/O system call

Includes UNIX file system basics, standard I/O programming libraries, UNIX file system call libraries, and more.

2. Time and Signal system call

This includes time acquisition and setting, timer usage, signal system invocation, and so on.

3. Process and thread system calls

This includes the system control and lifecycle of processes and threads, methods of designing concurrent programs using processes or threads, and so on.

4. Inter-process communication system invocation

Includes system calls for pipelines and IPC (Message Queuing, semaphores, shared content, and so on).

5. Socket Communication Application

It includes various modes of socket communication and the method of joint concurrent programming of socket and multi-process, multi-thread.

6. Curses Character Interface application

Including the method of using curses function library to operate network terminal and physical terminal, and the method of joint programming of curses library and socket.

7. Database Programming Applications

Including the use of database provided by the API functions and Embedded SQL Direct operation of the database method, and so on.

How to learn UNIX programming

Programming is a meticulous task, especially for UNIX under C programming. Whether the reader is interested in UNIX programming, or because of the pressure of work forced to choose UNIX programming, patience and meticulous are essential; and practice makes perfect the shortest way to learn knowledge forever:

1. Diligent operation, proficiency in UNIX applications

Many of the first contact UNIX readers in programming, often have the feeling of not knowing the program, or do not program, but do not know how to enter the UNIX system, do not know how to edit the program, do not know how to compile the program. Indeed, the Bottleneck for UNIX programming beginners is often not the program itself, but a series of seemingly unrelated transactions, such as installing machines, installing system software, and shell operations. So proficiency in the use of UNIX various operations, can greatly improve the UNIX programming efficiency.

In fact, UNIX programming is closely related to UNIX operations, and beginners can increase their understanding of UNIX programming by installing operating systems, installing database software, installing file systems, IPC control, and starting and stopping application software.

Basic UNIX operations are described in section $1.2 of this book, or please refer to the relevant books.

"Practical experience" only developers who are really skilled in using UNIX operating systems can really understand UNIX programming.

2. Diligent programming, improve the hands-on ability

Above his business is one of the characteristics of people's learning, many readers may encounter such doubts: Why the book program I can read, but the actual programming is not flexible application? In fact, this is a skilled process, the book of the example run several times, the book after the exercise solution several times, Perhaps you will find that successfully mastering UNIX programming is no longer a ethereal dream. The mathematician Hua once said "the bitter onslaught is dry, the skillful birth hundred qiao Come" is this truth.

Readers of this book can practice in the following ways:

(1) Learn the examples in the book and compile and execute them.

(2) Understanding examples, extrapolate, and contact practice, thinking about the application of examples in the practice of production.

(3) Step by step complete the code in Appendix C, "Proficient in C language programming in UNIX 100 cases."

"Practical experience" although the source code for all the examples of this book accompanies the book Code, please input, compile and execute all the procedures manually. Because:

· Entering the code process will deepen your memory and understanding.

· Manual input process will certainly produce some clerical errors, resulting in the program can not be compiled through, or not normal operation, and the process of debugging the program is actually a best practice.

· Entering the code yourself and passing the test will create a sense of accomplishment that greatly increases your interest in learning.

3. Think more, extrapolate master the Knowledge

In practical applications, there are a variety of situations, not the book can be exhausted instances. Therefore, after learning an example, the reader can according to the actual situation of the enterprise, write a case with enterprise characteristics, that is, learning Unix programming, and in advance for the practice of production prepared.

In short, learn UNIX programming the most serious practice, the reader must personally debug the book instance, complete the book after the exercise, only so as soon as possible to reach "the crowd to find him 1100 degrees, the twilight look back, the man is in the lights of the gate" realm.

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Excellent Employment Development tutorial-Proficient in UNIX C programming and project practice