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The C programming language made simple

Practical use case for fork and pipe in C

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/wait.h> int main(int argc, char* argv[]) { int arr[] = { 1, 2, 3, 4, 1, 2, 7, 7 }; int arrSize = sizeof(arr) / sizeof(int); int start, end; int fd[2]; if (pipe(fd) == -1) { return 1; } int id = fork(); if (id == -1) { return 2; } if (id == 0) { start = 0; end = arrSize / 2; } else { start = arrSize / 2; end = arrSize; } int sum = 0; int i; for (i = start; i < end; i++) { sum += arr[i]; } printf("Calculated partial sum: %d\n", sum); if (id == 0) { close(fd[0]); if (write(fd[1], &sum, sizeof(int)) == -1) { return 3; } close(fd[1]); } else { int sumFromChild; close(fd[1]); if (read(fd[0], &sumFromChild, sizeof(int)) == -1) { return 4; } close(fd[0]); int totalSum = sum + sumFromChild; printf("Total sum is %d\n", totalSum); wait(NULL); } return 0; }