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@HasanYahya101
HasanYahya101 committed Sep 20, 2024
1 parent df609c4 commit 1a752f3
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71 changes: 71 additions & 0 deletions Lab_04/L227971_Lab04_q1.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <sys/wait.h>

void reverse_case(char *str)
{
for (int i = 0; str[i] != '\0'; i++)
{
if (islower(str[i]))
{
str[i] = toupper(str[i]);
}
else if (isupper(str[i]))
{
str[i] = tolower(str[i]);
}
}
}

int main()
{
int pipefd[2];

if (pipe(pipefd) == -1)
{
printf("Error: Pipe creation failed\n");
exit(1);
}
int pid;
pid = fork();
if (pid == -1)
{
printf("Error: Fork failed\n");
exit(1);
}

if (pid > 0)
{
char message[100];
printf("Enter a message: ");
fgets(message, sizeof(message), stdin);
int len = strlen(message);
if (len > 0 && message[len - 1] == '\n')
{
message[len - 1] = '\0';
}
close(pipefd[0]);
write(pipefd[1], &len, sizeof(len));
write(pipefd[1], message, strlen(message) + 1);
close(pipefd[1]);
wait(NULL);
}
else
{
int size = 0;
close(pipefd[1]);
read(pipefd[0], &size, sizeof(size));
char *str = (char *)malloc(size);
read(pipefd[0], str, size);
close(pipefd[0]);
reverse_case(str);
printf("Reversed case message: %s\n", str);
free(str);
exit(0);
}

return 0;
}
80 changes: 80 additions & 0 deletions Lab_04/L227971_Lab04_q2.c
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#include <stdio.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdlib.h>

int main()
{
int pipe1[2], pipe2[2];

if (pipe(pipe1) == -1 || pipe(pipe2) == -1)
{
printf("Error: Pipe creation failed\n");
return 1;
}

int pid;
pid = fork();

if (pid < 0)
{
printf("Error: Fork failed\n");
return 1;
}

if (pid > 0)
{
int sum = 0;
int num_elements;
printf("Enter the number of elements: ");
scanf("%d", &num_elements);

int arr[num_elements];
printf("Enter the elements of the array:\n");
for (int i = 0; i < num_elements; i++)
{
scanf("%d", &arr[i]);
}
int size = sizeof(int) * num_elements;
close(pipe1[0]);
close(pipe2[1]);

write(pipe1[1], &num_elements, sizeof(int));
write(pipe1[1], arr, size);
close(pipe1[1]);

read(pipe2[0], &sum, sizeof(int));
close(pipe2[0]);

wait(NULL);

printf("Sum of array: %d\n", sum);
}
else
{
int sum = 0;
int num;
close(pipe1[1]);
close(pipe2[0]);

read(pipe1[0], &num, sizeof(int));

int arr[num];
int size = sizeof(int) * num;

read(pipe1[0], arr, size);
close(pipe1[0]);

for (int i = 0; i < num; i++)
{
sum += arr[i];
}

write(pipe2[1], &sum, sizeof(int));
close(pipe2[1]);

exit(0);
}

return 0;
}
80 changes: 80 additions & 0 deletions Lab_04/L227971_Lab04_q3.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/wait.h>

int main(int argc, char *argv[])
{
if (argc != 3)
{
printf("Error: No file names entered\n");
return 1;
}

int pipe_fd[2];
if (pipe(pipe_fd) == -1)
{
printf("Pipe creation failed\n");
return 1;
}

int pid = fork();
if (pid < 0)
{
printf("Fork failed\n");
return 1;
}

if (pid > 0)
{
int src_fd = open(argv[1], O_RDONLY);
if (src_fd < 0)
{
printf("Error opening source file\n");
return 1;
}

close(pipe_fd[0]);

char buffer[1024];
int bytes_read;
while ((bytes_read = read(src_fd, buffer, sizeof(buffer))) > 0)
{
write(pipe_fd[1], buffer, bytes_read);
}

close(src_fd);
close(pipe_fd[1]);

wait(NULL);
}
else
{
close(pipe_fd[1]);

int dest_fd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (dest_fd < 0)
{
printf("Error opening destination file\n");
return 1;
}

dup2(pipe_fd[0], 0);
close(pipe_fd[0]);

dup2(dest_fd, 1);
close(dest_fd);

char buffer[1024];
int bytes_read;
while ((bytes_read = read(0, buffer, sizeof(buffer))) > 0)
{
write(1, buffer, bytes_read);
}

exit(0);
}

return 0;
}
148 changes: 148 additions & 0 deletions Lab_04/L227971_Lab04_q4.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdbool.h>
#include <string.h>

int gcd(int a, int b)
{
while (b != 0)
{
int temp = b;
b = a % b;
a = temp;
}
return a;
}

bool is_prime(int num)
{
if (num <= 1)
return false;
for (int i = 2; i * i <= num; i++)
{
if (num % i == 0)
return false;
}
return true;
}

int main()
{
int pipe1[2], pipe2[2];
if (pipe(pipe1) == -1 || pipe(pipe2) == -1)
{
printf("Error: Pipe creation failed");
return 1;
}

int pid1 = fork();
if (pid1 < 0)
{
printf("Error: Fork failed");
return 1;
}

if (pid1 > 0)
{
close(pipe1[0]);
close(pipe2[1]);

int num_elements;
printf("Enter the number of elements: ");
scanf("%d", &num_elements);

while (num_elements <= 0)
{
printf("Error: Number of elements should be greater than 0\n");
printf("Enter the number of elements: ");
scanf("%d", &num_elements);
}

int arr[num_elements];
printf("Enter the elements: ");
for (int i = 0; i < num_elements; i++)
{
scanf("%d", &arr[i]);
}

write(pipe1[1], &num_elements, sizeof(int));
write(pipe1[1], arr, sizeof(arr));
close(pipe1[1]);

char result_msg[50];
int bytes_read = read(pipe2[0], result_msg, sizeof(result_msg));
close(pipe2[0]);

result_msg[bytes_read] = '\0';
printf("%s\n", result_msg);
wait(NULL);
}
else
{
int pid2 = fork();
if (pid2 < 0)
{
printf("Error: Fork failed");
return 1;
}

if (pid2 > 0) // Child process 1: Bob
{
close(pipe1[1]);
close(pipe2[0]);

dup2(pipe1[0], 0);
close(pipe1[0]);
dup2(pipe2[1], 1);
close(pipe2[1]);

int num_elements;
read(0, &num_elements, sizeof(int));
int arr[num_elements];
read(0, arr, sizeof(arr));

int result_gcd = arr[0];
for (int i = 1; i < num_elements; i++)
{
result_gcd = gcd(result_gcd, arr[i]);
}

// Send the GCD to Charlie via stdout
write(1, &result_gcd, sizeof(int));

exit(0);
}
else // Child process 2: Charlie
{
close(pipe1[0]);
close(pipe1[1]);
close(pipe2[1]);

dup2(pipe2[0], 0);
close(pipe2[0]);

// Read the GCD from Bob via stdin
int result_gcd;
read(0, &result_gcd, sizeof(int));

// Check if the GCD is prime and send the result to Alice
char message[50];
if (is_prime(result_gcd))
{
sprintf(message, "The GCD is prime");
}
else
{
sprintf(message, "The GCD is not prime");
}

write(1, message, strlen(message) + 1); // Send the actual message length

exit(0);
}
}

return 0;
}

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