Lecture 1 CSCE 510 - Overview

• Course Pragmatics
  • text
  • References
  • Web site
  • Late HW
  • TextCode, Examples, Assignments, StevensCode
  • man, man -k , whatis, whereis, info
  • man -s 2 open
• Overview
  • What is Systems Programming?
  • Donavon Diagram
• Unix History
  • Ken Thompson AT&T Bell Labs (1969)
  • Dennis Ritchie C implementation
  • Berkeley Software Division BSD
    • vi - Bill Joy
    • paging system
  • System V Release 4 (SVR4) - unifying BSD and AT&T branches
  • POSIX - Portable Operating System Interface for Computer Environments
  • X Windows - MIT
  • Free Software Foundation
  • GNU Public License - Richard Stallman - software: emacs, g++, ...
  • LINUX - Linus Torvalds
• C history
  • Kernighan and Ritchie (K&R)
  • ANSI Standard C
  • C++ - Bjarne Stroustrup
• Primitive Unix I/O
  • /usr/include/stdio.h
  • Well actually /usr/ucbinclude
  • Unix I/O = files
  • standard descriptors
  • _iob[_NFILES] struct
• Unix I/O system Calls
  • ssize_t read(int fildes, void *buf, size_t nbyte);
  • ssize_t write(int fildes, const void *buf, size_t nbyte);
  • int open(const char *path, int oflag, /* mode_t mode */...);
  • int close(int fildes);
  • int creat(const char *path, mode_t mode);
  • equivalent to open(path, O_WRONLY | O_CREAT | O_TRUNC, mode)
  • off_t lseek(int fildes, off_t offset, int whence);
• Example: copy1.c
• Open file structures
  • per process table
  • open file table
  • vtable
• getchar
• The string library
  • /usr/include/string.h
  • strings in C
  • strlen
  • strcmp
  • strncmp
  • strcat
  • strncat
  • strcpy
  • strchr
  • strstr
  • strpbrk
  • strspn
  • strcspan
  • strtok
  • strerror
• unlink
• stdio.h /usr/ucbinclude
• getchar macro
  #define getc(p) (--(p)->_cnt < 0 ? __filbuf(p) : (int)*(p)->_ptr++)
• file sharing
• dup and dup2
• < Stat Structure (stat.h) >
• st_mode
• < filetype >
• < stat, fstat, lstat system calls >
• int stat(const char *path, struct stat *buf);
• int lstat(const char *path, struct stat *buf);
• int fstat(int fildes, struct stat *buf);

[Readings:]

[Assignment:]

Create a file with a hole in it and check the file size with "ls -s".

1. Get a copy of hole.c, compile and run it.
   1. cp /class/csci510/Examples/hole.c . // copy files
   2. cp /class/csci510/Examples/ourhdr.h .
   3. cc hole.c // Compile the program
   4. a.out // Create the file file.hole
2. Use man to see what "ls -s" tells you.
3. Use "ls -s file.hole.
4. Use "cp file.hole file2" to create another copy and then use "ls -s file2".
5. Use "wc" (wordcount on both of these files.

• [Readings:]
• [Handouts:] vi-basics, unix-basics
• [Assignment:]
  
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