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The C programming language made simple

How to send an array through a pipe

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/wait.h> #include <time.h> int main(int argc, char* argv[]) { int fd[2]; if (pipe(fd) == -1) { return 1; } int pid = fork(); if (pid == -1) { return 2; } if (pid == 0) { // Child process close(fd[0]); int n, i; int arr[10]; srand(time(NULL)); n = rand() % 10 + 1; printf("Generated: "); for (i = 0; i < n; i++) { arr[i] = rand() % 11; printf("%d ", arr[i]); } printf("\n"); if (write(fd[1], &n, sizeof(int)) < 0) { return 3; } printf("Sent n = %d\n", n); if (write(fd[1], &arr, sizeof(int) * n) < 0) { return 4; } printf("Sent array\n"); close(fd[1]); } else { close(fd[1]); int arr[10]; int n, i, sum = 0; if (read(fd[0], &n, sizeof(int)) < 0) { return 5; } printf("Received n = %d\n", n); if (read(fd[0], &arr, sizeof(int) * n) < 0) { return 6; } printf("Received array\n"); close(fd[0]); for (i = 0; i < n; i++) { sum += arr[i]; } printf("Result is %d\n", sum); wait(NULL); } return 0; }