Anonymous

#include <stdio.h>#include <sys/types.h>#include <stdlib.h>#include <sys/wait.h>#include <unistd.h>#include <fcntl.h>/*/ Eliasz Zurawka/ Sept 29/07/ PROG40000_Fall2007_Asg1/ Question 2*/int main(int argc, char **argv) {    if(argc != 2) {    printf("usage: elFork filename");  }    char *outputPath = argv[1];  int output;    if((output = open(outputPath, O_RDONLY)) == -1) {    printf("Could not open %s\n", outputPath);    exit(2);  }  pid_t pid1, pid2;  int status1, status2;    if((pid1 = fork())< 0) {    printf("error forking, exiting");    exit(1);  }    if(pid1 == 0) {    system("ps");  }  else {    pid2 = fork();    if(pid2 == 0) {      char readBuf[10]; memset(readBuf, 0, 10);      ssize_t r1 = read(output, readBuf, 9);      printf("\n\n Child Read: %s", readBuf);    }     else {      char readBuf[10]; memset(readBuf, 0, 10);      ssize_t r1 = read(output, readBuf, 9);      printf("\n\nParent Read: %s", readBuf);            while((waitpid(pid1, &status1, WNOHANG) == 0) ||	    (waitpid(pid2, &status2, WNOHANG) == 0)) {	//do Nothing      }      r1 = read(output, readBuf, 9);      printf("\n\nParent Read: %s", readBuf);      exit(0);    }  }  exit(0);}