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，#include，#include，#include，#include，#include，#include，#include#define MAX_BUFFER 1024void error(const char msg) {， perror(msg);， exit(1);，}int main(int argc, char argv[]) {， if (argc != 3) {， fprintf(stderr, "Usage: %s，", argv[0]);， exit(1);， } int sockfd;， struct sockaddr_in target_addr;， char buffer[MAX_BUFFER]; sockfd = socket(AF_INET, SOCK_STREAM, 0);， if (sockfd