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Unix System Programming
UNIX Systems Programming refers to the graphical user interface which is developed as software development platform that enable the creation of programs for various other platforms.It is rewritten in the C programming language which is closely tied to C and then later C++ that gives easy to use environment for users. The unix operating system is consist of three parts i.e. the kernel, the shell and the programs. The Kernal allocates time and memory to programs by handling filestore and communications in response to system calls,the shell is the interface between the user and the kernal and the programs are executed by processes which is identified by a unique PID.
Unix system programming defines the structure of Unix operating system which helps in writing system and network programs. It is most widely used in organizations for security purposes. It is the most secure operating system which ensures data integrity and data safety for an enterprise. Unix operating system deals with concepts viz. file system, multi-tasking processes, inter process communication, terminal and device input/output, video displays and network programming. Unix system programming helps developers to work with complex problems. This programming provides a communication between processes.
UNIX system programming involves following listed features:
- writing a shell program
- writing a fsck program
- writing a daemon program
Unix system programming depends on system calls and library calls. It involves major functions listed below:
- shell commands:- it involves mv, ls, cat
- system calls:- it involves exit, read, write
- library calls :- it involvesexit, printf
- device and network specific commands:- it involves mv, ls, cat
- file formats:- it involves passwd, termcap
- games and demos:- it involves fortune, worms admin functions
- Command shells, Shell/unix commands, Invoking commands and utilities, Learning about command options, I/o redirection, Metacharacters, Files and directories, Permissions, Navigation, Manipulation, Process control
- Piping, Background jobs, Bash tips and tricks, Shell shortcuts, Command history and manipulations, Start-up files, Additional shell and unix commands.
- The frequently useful, The occasionally useful, Bash scripting, I/o and command line arguments, Sequence, selection, and iteration, Arithmetic, Functions, C language, K & r c, Philosophies of c and java, Fundamental constructs of c
- Variables, types, and constants, Operators and i/o functions, Selection and iteration, Pointers and user-defined functions, Pointers, User-defined functions.
- Basic data structures, Arrays, . Strings, Structs and unions, File i/o, Large program development, Multifile programs, The make utility, Program debugging, cs 2 data structures in c, Dynamic memory allocation
- Linked lists, stacks, queues, Binary trees, Capabilities of the preprocessor, Bit-level operators, Function pointers, Unix environment: command line, globbing, i/o redirection.
- piping, basic commands
- Memory layout. Debugging: gdb, valgrind, essential x86, Fork, exec, wait, Process status, bit manipulation, sending signals, Unix i/o, Implementing i/o redirection, piping, Directories and files,
- Walking a directory tree, exploring attributes, Implementing ls -l. Permissions, file owner / group, time-stamps, Signals and signal handling, Design / implementation of sleep.
- Process relationships, Backgrounding. Popen / pclose, Terminal handling, Networking, Client / server. I/o multiplexing, Multi-threading: basics, mutual exclusion, Multi-threading: bounded buffers, condition variables
- Multi-threading: deadlocks, Non-blocking i/o. Regular expressions, Sys v ipc. Semaphores and shared memory, Shell scripting, Tbd, Unix history and philosophy.
- Awk programming, Unix file i/o, Static and shared libraries, Processes and signals, Pipes, System v ipc, Berkeley socket programming, Sun rpc, Posix pthread programming, Gcc, gdb, ddd, gprof, cvs
- UNIX basics , UNIX API, system calls, manuals, file I/O , filters standard input and output, read, write , open, makefiles, arguments, make, argc , argv , environment variables, file manipulation, creating files, deleting files
- directories, links , symbolic, terminal I/O , similarities to file I/O, tty drivers, stty , gtty, termcap , curses, signals , time , catching signals , catching problems, delays , finding the time, mixing C , scripts , shell scripts, C , shell, systems programming
- Users, files, manuals, Directories, file properties , file systems, Terminal control , signals, Event driven programming, Processes , programs, i/o redirection , pipes, Servers , sockets, Threads, Shell programming, pipes, redirection, variables, control
- environment variables, gcc, C compiler, make, grep, valgrind, gprof, gdb, strace, Files, creating Files, reading Files, writing Files, Formatted input, Formatted output, Signals