Rework children creation and add recursive calls
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parent
446ac678db
commit
c70db7363d
194
cpair/cpair.c
194
cpair/cpair.c
@ -60,7 +60,28 @@ float get_distance(float x1, float x2, float y1, float y2);
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node_t * find_shortest_distance(node_t * list);
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int wait_for_termination(pid_t child);
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int main(void) {
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int main(int argc, char *argv[]) {
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if (argc > 1) {
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puts("The command takes no additional arguments.");
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puts("Usage: cpair");
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exit(EXIT_FAILURE);
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}
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fprintf(stderr, "Process id: %d\n", getpid());
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/**
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* Create the pipe file descriptors and inititalize the pipes
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*
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* fd[0] - input side of pipe
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* fd[1] - output side of pipe
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*
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**/
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int in_pipe_a[2], out_pipe_a[2], in_pipe_b[2], out_pipe_b[2];
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if(pipe(in_pipe_a) < 0 || pipe(in_pipe_b) < 0 || pipe(out_pipe_a) < 0 || pipe(out_pipe_b) < 0) {
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fprintf(stderr, "ERROR: Failed creating the pipes\n");
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exit(EXIT_FAILURE);
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}
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char input[__UINT8_MAX__] = ""; ///< An array to save the input to
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int point_num = 0; ///< Save the number of points
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node_t * head = NULL;
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@ -101,101 +122,126 @@ int main(void) {
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exit(EXIT_SUCCESS);
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}
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float x_mean = get_x_mean(head);
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node_t * first_part = malloc(sizeof(node_t));
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node_t * second_part = malloc(sizeof(node_t));
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node_t * first_part_buff = first_part;
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node_t * second_part_buff = second_part;
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/// Separate the lists based on the mean
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current = head;
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while(current != NULL) {
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if(current -> points[0] <= x_mean) {
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first_part_buff -> points[0] = current -> points[0];
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first_part_buff -> next = malloc(sizeof(node_t));
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first_part_buff = first_part_buff -> next;
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} else {
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second_part_buff -> points[0] = current -> points[0];
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second_part_buff -> next = malloc(sizeof(node_t));
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second_part_buff = second_part_buff -> next;
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}
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current = current -> next;
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}
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/**
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* Create the pipe file descriptors and inititalize the pipes
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*
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* fd[0] - input side of pipe
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* fd[1] - output side of pipe
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*
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**/
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int pipe_a[2], pipe_b[2];
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if(pipe(pipe_a) < 0 || pipe(pipe_b) < 0) {
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fprintf(stderr, "ERROR: Failed creating the pipe\n");
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exit(EXIT_FAILURE);
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}
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pid_t child_a, child_b; ///< Create variables for the child processes
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node_t * child_a_part = NULL;
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node_t * child_b_part = NULL;
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write(pipe_a[0], first_part, sizeof(node_t)); ///< Send the first part of the array to the child
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/// Create first child
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switch(child_a = fork()) {
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case -1:
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fprintf(stderr ,"ERROR: Couldn't fork child\n");
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exit(EXIT_FAILURE);
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case 0:
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if(read(pipe_a[0], child_a_part, sizeof(node_t)) < 0) {
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fprintf(stderr, "ERROR: Failed reading from pipe\n");
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/// Child execution
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fprintf(stderr, "Child 1 id: %d\n", getpid());
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close(out_pipe_a[0]);
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close(in_pipe_a[1]);
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close(STDIN_FILENO);
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if(dup2(in_pipe_a[0], STDIN_FILENO) != STDIN_FILENO) {
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fprintf(stderr, "ERROR: Failed duplicating STDIN");
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exit(EXIT_FAILURE);
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}
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if(write(pipe_a[1], find_shortest_distance(child_a_part), sizeof(node_t)) < 0) {
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fprintf(stderr, "ERROR: Failed writing to pipe\n");
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exit(EXIT_FAILURE);
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}
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exit(EXIT_SUCCESS);
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break;
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execlp(argv[0], argv[0], NULL);
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fprintf(stderr, "ERROR: Failed to load program into child");
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exit(EXIT_FAILURE);
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default:
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write(pipe_b[0], second_part, sizeof(node_t));
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/// Parent execution
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/// Create second child
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switch(child_b = fork()) {
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case -1:
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fprintf(stderr, "ERROR: Couldn't fork child\n");
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exit(EXIT_FAILURE);
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case 0:
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if(read(pipe_b[0], child_b_part, sizeof(node_t)) < 0) {
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fprintf(stderr, "ERROR: Failed reading from pipe\n");
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/// Child execution
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fprintf(stderr, "Child 2 id: %d\n", getpid());
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close(out_pipe_b[0]);
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close(in_pipe_b[1]);
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close(STDIN_FILENO);
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if(dup2(in_pipe_b[0], STDIN_FILENO) != STDIN_FILENO) {
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fprintf(stderr, "ERROR: Failed duplicating STDIN");
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exit(EXIT_FAILURE);
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}
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if(write(pipe_b[1], find_shortest_distance(child_b_part), sizeof(node_t)) < 0) {
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fprintf(stderr, "ERROR: Failed writing to pipe\n");
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exit(EXIT_FAILURE);
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}
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exit(EXIT_SUCCESS);
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break;
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execlp(argv[0], argv[0], NULL);
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fprintf(stderr, "ERROR: Failed to load program into child");
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exit(EXIT_FAILURE);
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default:
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/// Parent execution
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close(in_pipe_a[0]);
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close(in_pipe_b[0]);
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close(STDOUT_FILENO);
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float x_mean = get_x_mean(head);
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node_t * first_part = malloc(sizeof(node_t));
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int first_part_len = 1;
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node_t * second_part = malloc(sizeof(node_t));
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int second_part_len = 1;
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node_t * first_part_buff = first_part;
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node_t * second_part_buff = second_part;
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/// Separate the lists based on the mean
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current = head;
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while(current != NULL) {
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if(current -> points[0] <= x_mean) {
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first_part_buff -> points[0] = current -> points[0];
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first_part_buff -> next = malloc(sizeof(node_t));
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first_part_buff = first_part_buff -> next;
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first_part_len ++;
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} else {
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second_part_buff -> points[0] = current -> points[0];
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second_part_buff -> next = malloc(sizeof(node_t));
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second_part_buff = second_part_buff -> next;
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second_part_len ++;
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}
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current = current -> next;
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}
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/**
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* Send the correct lists to the children
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**/
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/// First half
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if(dup2(in_pipe_a[1], STDIN_FILENO) != STDIN_FILENO) {
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fprintf(stderr, "ERROR: Failed duplicating STDIN");
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exit(EXIT_FAILURE);
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}
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if (write(in_pipe_a[1], first_part_buff, first_part_len*sizeof(node_t)) < 0) {
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fprintf(stderr, "ERROR: Failed writing to child\n");
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exit(EXIT_FAILURE);
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}
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close(STDOUT_FILENO);
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///Second half
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if(dup2(in_pipe_b[1], STDIN_FILENO) != STDIN_FILENO) {
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fprintf(stderr, "ERROR: Failed duplicating STDIN");
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exit(EXIT_FAILURE);
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}
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if (write(in_pipe_b[1], first_part_buff, second_part_len*sizeof(node_t)) < 0) {
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fprintf(stderr, "ERROR: Failed writing to child\n");
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exit(EXIT_FAILURE);
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}
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close(STDOUT_FILENO);
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/// Wait for the correct exit of the children
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if(wait_for_termination(child_a) != EXIT_SUCCESS || wait_for_termination(child_b) != EXIT_SUCCESS) {
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fprintf(stderr, "ERROR: Children didn't terminate successfully");
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exit(EXIT_FAILURE);
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}
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/// Free the memory
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free(head);
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free(first_part);
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free(first_part_buff);
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free(second_part);
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free(second_part_buff);
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free(current);
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break;
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}
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break;
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}
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if(wait_for_termination(child_a) != EXIT_SUCCESS)
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exit(EXIT_FAILURE);
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if(wait_for_termination(child_b) != EXIT_SUCCESS)
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exit(EXIT_FAILURE);
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/// Free the memory
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free(head);
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free(first_part);
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free(first_part_buff);
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free(second_part);
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free(second_part_buff);
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free(current);
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exit(EXIT_SUCCESS);
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}
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