[ece333] -- Preparation for Lab assignment #3

Class, 
Tommorrow, I will be going over Lab #3. I will assume that you know C(or C++) (especially working with pointers). 
Here are some links that i had collected when I was doing CS485, which might prove useful for creating Makefiles, using gdb etc. 
http://mia.ece.uic.edu/~papers/cs485/index.html

Two important C/C++ functions that you will use in this lab are:
fork and pipe;
So make your self comfortable with these two functions. Here is a test code, which you can compile using
"gcc -o test test.c" command.
----------------------------------------------
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
int main(void){
  int fd[2];
  int pid;

  if (pipe(fd) < 0) printf("Error pipe\n");

    if ((pid = fork())< 0) printf("Error fork\n");

     if (pid == 0){
      //child                                            close(0);
       dup(fd[0]);
       close(fd[0]);
       close(fd[1]);
       if (execlp("/usr/bin/wc", "/usr/bin/wc", NULL) < 0)
       printf("Error exe cjoild\n");
        }else{
        //Parent                                            close(1);
          dup(fd[1]);
          close(fd[0]);
          close(fd[1]);
          if (execl ("/usr/bin/ls", "/usr/bin/ls", NULL) < 0)
          printf("Error exe parent\n");
  }

}