Matt Ramsay CS 375 EXAM 2 Part 1

Transcription

1 Matt Ramsay CS 375 EXAM 2 Part 1 Output: csserver:/home/mr56/cs375/exam2 > parent Multiples of 3 between 3 and add to This total written to /home/mr56/tmp/file8771.out Multiples of 3 between and add to This total written to /home/mr56/tmp/file8772.out Multiples of 3 between and add to This total written to /home/mr56/tmp/file8773.out Multiples of 3 between and add to This total written to /home/mr56/tmp/file8774.out Multiples of 3 between and add to This total written to /home/mr56/tmp/file8775.out First fifth added to Second fifth added to Third fifth added to Fourth fifth added to Last fifth added to Total added to Parent Code: #include <iostream> #include <unistd.h> #include <stdlib.h> #include <string.h> #include <libgen.h> #include <sys/stat.h> #include <sys/types.h>

2 #include <fcntl.h> #include <sys/wait.h> #include <dirent.h> #include <errno.h> #include <pwd.h> #include <grp.h> #include <time.h> using namespace std; int main(int argc, char *argv[]) if(argc!= 3) cout << "You didn't enter enough commmand line arguments, you are a fuck-stick\n"; DIR *dp; // file descriptor struct dirent *de; // another file descriptor struct stat statbuf; // struct for stat command int total = 0; // sum of numbers char inputsum[16] = ' '; // temp sum int blah, beread, fd; // file desciptors and counters int lower = atoi(argv[1]); // lower bound int upper = atoi(argv[2]); // upper bound int division = (upper-lower)/5; // divide by 5 if((upper-lower)%5!= 0) division++; char path[16] = ' '; // strings to save file names char blah1[27] = ' '; char blah2[27] = ' '; char blah3[27] = ' '; char blah4[27] = ' '; char blah5[27] = ' '; char first[5] = ' '; char second[5] = ' '; char third[5] = ' '; char fourth[5] = ' '; char fifth[5] = ' '; char firstb[5] = ' '; char secondb[5] = ' '; char thirdb[5] = ' '; char fourthb[5] = ' '; char fifthb[5] = ' ';

3 char file1[35] = ' '; char file2[35] = ' '; char file3[35] = ' '; char file4[35] = ' '; char file5[35] = ' '; pid_t pid1, pid2, pid3, pid4, pid5; //fork file descriptors sprintf(path, "/home/mr56/tmp/*"); //writing proper names into strings sprintf(first,"%d",lower); sprintf(firstb,"%d",division); sprintf(second,"%d",(division+1)); sprintf(secondb,"%d",(division*2)); sprintf(third,"%d",((division*2)+1)); sprintf(thirdb,"%d",(division*3)); sprintf(fourth,"%d",((division*3)+1)); sprintf(fourthb,"%d",(division*4)); sprintf(fifth,"%d",((division*4)+1)); sprintf(fifthb,"%d",upper); pid1 = fork(); // fork first process if(pid1 == 0) execl("exam2", "exam2", first, firstb, 0); // exec child pid2 = fork(); // fork second process if(pid2 == 0) execl("exam2", "exam2", second, secondb, 0); // exec child pid3 = fork(); // fork third process if(pid3 == 0) execl("exam2", "exam2", third, thirdb, 0); // exec child pid4 = fork(); // fork fourth process if(pid4 == 0) execl("exam2", "exam2", fourth, fourthb, 0); //exec child pid5 = fork(); // fork fifth process if(pid5 == 0)

4 execl("exam2", "exams", fifth, fifthb, 0); // exec child int stat_val; pid_t child_pid; pid1 = wait(&stat_val); // wait for children to finish pid2 = wait(&stat_val); pid3 = wait(&stat_val); pid4 = wait(&stat_val); pid5 = wait(&stat_val); if((dp = opendir("/home/mr56/tmp")) == NULL) //open directory cout << "Error opening /home/mr56/tmp" << endl; de = readdir(dp); // read first two files '.' and '..' de = readdir(dp); // and disregard if((de = readdir(dp))!= NULL) // save files from children to file1 - file 5 sprintf(file1, "%s", de->d_name); if((de = readdir(dp))!= NULL) sprintf(file2, "%s", de->d_name); if((de = readdir(dp))!= NULL) sprintf(file3, "%s", de->d_name); if((de = readdir(dp))!= NULL)

5 sprintf(file4, "%s", de->d_name); if((de = readdir(dp))!= NULL) sprintf(file5, "%s", de->d_name); closedir(dp); close directory sprintf(blah1, "/home/mr56/tmp/%s", file1); fd = open(blah1, O_RDONLY); //open first file beread = read(fd, inputsum, 12); // read partial sum blah = atoi(inputsum); //change to int cout << endl << "First fifth added to " << blah << endl; // add to total //close file //same for next four files sprintf(blah2, "/home/mr56/tmp/%s", file2); fd = open(blah2, O_RDONLY); beread = read(fd, inputsum, 12); blah = atoi(inputsum); cout << "Second fifth added to " << blah << endl; sprintf(blah3, "/home/mr56/tmp/%s", file3); fd = open(blah3, O_RDONLY); beread = read(fd, inputsum, 12); blah = atoi(inputsum); cout << "Third fifth added to " << blah << endl; sprintf(blah4, "/home/mr56/tmp/%s", file4); fd = open(blah4, O_RDONLY); beread = read(fd, inputsum, 12);

6 blah = atoi(inputsum); cout << "Fourth fifth added to " << blah << endl; sprintf(blah5, "/home/mr56/tmp/%s", file5); fd = open(blah5, O_RDONLY); beread = read(fd, inputsum, 12); blah = atoi(inputsum); cout << "Last fifth added to " << blah << endl; cout << "Total added to " << total << endl << endl; sprintf(path, "/home/mr56/tmp/%s", file1); // delete files made by children sprintf(path, "/home/mr56/tmp/%s", file2); sprintf(path, "/home/mr56/tmp/%s", file3); sprintf(path, "/home/mr56/tmp/%s", file4); sprintf(path, "/home/mr56/tmp/%s", file5); Child Code: #include <iostream> #include <unistd.h> #include <stdlib.h> #include <string.h> #include <libgen.h> #include <sys/stat.h> #include <sys/types.h> #include <fcntl.h> #include <sys/wait.h> using namespace std; int main(int argc, char *argv[]) if(argc!= 3)

7 cout << "You didn't enter enough commmand line arguments, you are a fuck-stick\n"; char filename[35] = ' '; // string for filename char outputsum[20] = ' '; // string for number int fd, written; // file descriptors int sum = 0; // sum int id = getpid(); // id of child int lower = atoi(argv[1]); // lower bound int upper = atoi(argv[2]); // upper bound sprintf(filename,"/home/mr56/tmp/file%d.out",id); // make filename string if(lower < 3) // start at first multiple of three in range lower = 3; if(lower % 3 == 1) lower += 2; else if(lower % 3 == 2) lower += 1; for(int i = lower; i <= upper; i++) // loop for sum sum += i; i += 2; sprintf(outputsum, "%d", sum); //write sum to string fd = open(filename, O_RDWR O_CREAT); // open file and creates if not there chmod(filename, 777); // make file writeable written = write(fd, outputsum, 20); //write total to file //close file chmod(filename, 777); // unnesessary crap // output cout << endl << endl << "Multiples of 3 between " << lower << " and " << upper << " add to " << sum << endl; cout << "This total written to " << filename << endl;

8 Makefile: finish:parent.o exam2.o g++ -o parent parent.cpp g++ -o exam2 exam2.cpp parent.o:parent.cpp g++ -c parent.cpp exam2.o:exam2.cpp g++ -c exam2.cpp