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Advanced Programming in the UNIX, Thesis of Applications of Computer Sciences

National University of Science and Technology BulawayoApplications of Computer Sciences

Advanced Programming in the UNIX environment

Typology: Thesis

2017/2018

Uploaded on 09/17/2018

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CS631 - Advanced Programming in the UNIX Environment Slide 1
CS631 - Advanced Programming in the UNIX
Environment
Department of Computer Science
Stevens Institute of Technology
Jan Schaumann
[email protected]
http://www.cs.stevens.edu/~jschauma/631/
Lecture 01: Introduction, UNIX history, UNIX Programming Basics August 28, 2017
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CS631 - Advanced Programming in the UNIX Environment

CS631 - Advanced Programming in the UNIX

Environment

Department of Computer Science Stevens Institute of Technology

Jan Schaumann

[email protected]

http://www.cs.stevens.edu/~jschauma/631/

Lecture 01: Introduction, UNIX history, UNIX Programming Basics

August 28, 2017

CS631 - Advanced Programming in the UNIX Environment

New Rules

Close your laptops!

Lecture 01: Introduction, UNIX history, UNIX Programming Basics

August 28, 2017

CS631 - Advanced Programming in the UNIX Environment

It is The class is called “Advanced Programming in the UNIX Environment”. About this class

not

an introduction to C an introduction to programming an introduction to Unix

Lecture 01: Introduction, UNIX history, UNIX Programming Basics

August 28, 2017

CS631 - Advanced Programming in the UNIX Environment

What is it?

http://cm.bell-labs.com/who/dmr/chist.html

Lecture 01: Introduction, UNIX history, UNIX Programming Basics

August 28, 2017

CS631 - Advanced Programming in the UNIX Environment

Lecture 01: Introduction, UNIX history, UNIX Programming Basics$ int socketpair(int, int, int, int *);int socket(int, int, int);int setsockopt(int, int, int, const void *, socklen_t);ssize_t sendmsg(int, const struct msghdr *, int);ssize_t sendto(int, const void *,ssize_t send(int, const void *, size_t, int);ssize_t recvmsg(int, struct msghdr *, int);ssize_t recvfrom(int, void * __restrict, size_t, int,ssize_t recv(int, void *, size_t, int);int listen(int, int);int getsockopt(int, int, int, void * __restrict, socklen_t * __restrict);int connect(int, const struct sockaddr *, socklen_t);int bind(int, const struct sockaddr *, socklen_t);int accept(int, struct sockaddr * __restrict, socklen_t * __restrict); $ grep "(int" /usr/include/sys/socket.h In a nutshell: the ”what”

August 28, 2017

CS631 - Advanced Programming in the UNIX Environment

In a nutshell: the ”what”

understand fundamental OS concepts (with focus on UNIX family): gain (systems) programming experience gain an understanding of the UNIX operating systems

basic network programming using a client/server model interprocess communication process relationships basic and advanced I/O multi-user concepts

Lecture 01: Introduction, UNIX history, UNIX Programming Basics

August 28, 2017

CS631 - Advanced Programming in the UNIX Environment

In a nutshell: the ”how”

if (isatty(STDOUT_FILENO)) {/* Terminal defaults to -Cq, non-terminal defaults to -1. */setlocale(LC_ALL, "");setprogname(argv[0]);const char *p;int kflag = 0;int ch, fts_options;struct winsize win; static char dot[] = ".", *dotav[] = { dot, NULL };

if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 &&

termwidth = win.ws_col;win.ws_col > 0)

f_column = f_nonprint = 1;

} else

f_singlecol = 1;

if (!getuid())/* Root is -A automatically. */

f_listdot = 1;

while ((ch = getopt(argc, argv, "1ABCFLRSTWabcdfghiklmnopqrstuwx")) != -1) {fts_options = FTS_PHYSICAL;

/switch (ch) { / shell aliasing works correctly. The -1, -C, -l, -m and -x options all override each other so

case '1':

f_singlecol = 1;

Lecture 01: Introduction, UNIX history, UNIX Programming Basics

August 28, 2017

CS631 - Advanced Programming in the UNIX Environment

Lecture 01: Introduction, UNIX history, UNIX Programming Basics$ Hooray!$ echo "Hooray!"$ ./cmd$ cc -Wall -g -o cmd cmd.c $ $EDITOR cmd.c In a nutshell: the ”how”

August 28, 2017

CS631 - Advanced Programming in the UNIX Environment

Lecture 01: Introduction, UNIX history, UNIX Programming Basics$ Hooray!$ echo "Hooray!"$ ./cmd$ cc -Wall -g -o cmd cmd.c $ $EDITOR cmd.c In a nutshell: the ”how”

August 28, 2017

CS631 - Advanced Programming in the UNIX Environment

Lecture 01: Introduction, UNIX history, UNIX Programming Basics$ cmd.c:19: error: parse error before "return"cmd.c: In function `main':$ cc -Wall -g -o cmd cmd.c $ $EDITOR cmd.c In a nutshell: the ”how”

August 28, 2017

CS631 - Advanced Programming in the UNIX Environment

#0Loaded symbols for /usr/libexec/ld.elf_soProgram terminated with signal 11, Segmentation fault.$ gdb ./cmd cmd.core!@#!@!!!??#@!$ echo "!@#!@!!!??#@!"Memory fault (core dumped)$ ./cmd$ cc -Wall -g -o cmd cmd.c$ $EDITOR cmd.ccmd.c:19: error: parse error before "return"cmd.c: In function `main':$ cc -Wall -g -o cmd cmd.c $ $EDITOR cmd.c In a nutshell: the ”how”

0xbbbc676a in __findenv () from /usr/lib/libc.so.

Lecture 01: Introduction, UNIX history, UNIX Programming Basics(gdb)

August 28, 2017

CS631 - Advanced Programming in the UNIX Environment

Programming

https://i.imgur.com/WnpMFjX.jpg https://i.imgur.com/ZyeCO.jpg

Lecture 01: Introduction, UNIX history, UNIX Programming Basics

August 28, 2017

CS631 - Advanced Programming in the UNIX Environment

Syllabus

Review Code reading, coding style, best practices Encryption Advanced I/O: Nonblocking I/O, Polling, and Record Locking Daemon Processes, shared libraries Interprocess Communication Process Groups, Sessions, Signals Process Environment, Process Control UNIX tools: make(1), gdb(1), revision control, etc. Filesystems, System Data Files, Time & Date Files and Directories File I/O, File Sharing Introduction, UNIX history, UNIX Programming Basics

Lecture 01: Introduction, UNIX history, UNIX Programming Basics

August 28, 2017

CS631 - Advanced Programming in the UNIX Environment

UNIX History

Lecture 01: Introduction, UNIX history, UNIX Programming Basics

August 28, 2017