TDC368UNIXandNetworkProgramming.ppt

TDC368UNIX and Network Programming ;Course Outline;Course Outline (cont.);Objectives;Prerequisites;Texts;Other References ;Class Work and Grading;Programming Environment;TDC368 – Network Programming;Class Communication;UNIX - Brief History;UNIX Features;UNIX Major Versions;UNIX Standards;UNIX Implementations;UNIX Implementations;UNIX Architectural Overview;UNIX Features;Multi-process/Multi-user architecture;UNIX Processes;UNIX Threads;Some Unix Terms;UNIX Kernel - model ;;UNIX Kernel - low level ;Kernel - services level ;Kernel - services level ;System Call Interface level;User Processes level; UNIX and POSIX API Library Functions ANSI C Standard ANSI/ISO C++ Standard ;UNIX and POSIX API;UNIX and POSIX API;UNIX and POSIX API;UNIX and POSIX API;UNIX and POSIX API;UNIX and POSIX API;UNIX and POSIX API;Library Functions;ANSI C Standard;Standard C library functions;Standard C library functions;Example: ls -l|grep tdc368;Standard C library functions;Example: ls -l|grep tdc368;Example: getenv/putenv;Example: malloc.h;Standard C library functions;Example: time.h;Standard C library functions;Example: assert.h;ANSI/ISO C++ Standard;Compilation cc -o file file.c file Man Pages man cc man sys_call man shell_cmd;Processes;Process Control Block (process attributes);Process Image Map;Example:;Process States ;Process Model ;Context of a Process process state (defined by it’s code) value of u-area values of registers the process uses contents of user and kernel stacks is associated with process image map Context Switching system executes a process in the context of the process when the kernel decides to execute another process, it does context switching kernel saves enough information such that it can later switch back to the first process and resumes its execution Mode Switching moving from user to kernel mode kernel save information to return to user mode;User mode processes in use mode can access their own instructions and data; NOT kernel or other process’s code or data Ker