C语言写一个股票服务器代码

股票服务器的实现需要涉及到网络编程和多线程编程，下面是一个简单的示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <pthread.h>

#define MAX_CLIENTS 10
#define BUFFER_SIZE 1024

struct stock {
    char name[10];
    float price;
};

struct stock stocks[] = {
    {"AAPL", 123.45},
    {"GOOG", 678.90},
    {"MSFT", 111.22},
    {"AMZN", 999.99},
    {"FB", 234.56}
};

void *handle_client(void *arg) {
    int client_sock = *(int*)arg;
    char buffer[BUFFER_SIZE];
    memset(buffer, 0, BUFFER_SIZE);
    
    while (1) {
        int bytes_received = recv(client_sock, buffer, BUFFER_SIZE, 0);
        if (bytes_received < 0) {
            printf("Error receiving data from client\n");
            break;
        } else if (bytes_received == 0) {
            printf("Client disconnected\n");
            break;
        }
        
        // Parse the client request and send the stock price
        char *symbol = strtok(buffer, " ");
        if (symbol == NULL) {
            printf("Invalid request from client\n");
            break;
        }
        
        int i;
        for (i = 0; i < sizeof(stocks)/sizeof(stocks[0]); i++) {
            if (strcmp(stocks[i].name, symbol) == 0) {
                char response[BUFFER_SIZE];
                snprintf(response, BUFFER_SIZE, "The price of %s is %.2f", stocks[i].name, stocks[i].price);
                send(client_sock, response, strlen(response), 0);
                break;
            }
        }
        
        if (i == sizeof(stocks)/sizeof(stocks[0])) {
            char response[BUFFER_SIZE];
            snprintf(response, BUFFER_SIZE, "Invalid symbol: %s", symbol);
            send(client_sock, response, strlen(response), 0);
        }
    }
    
    close(client_sock);
    pthread_exit(NULL);
}

int main() {
    int server_sock, client_sock;
    struct sockaddr_in server_addr, client_addr;
    socklen_t client_len = sizeof(client_addr);
    pthread_t tid[MAX_CLIENTS];
    int i = 0;
    
    // Create the server socket
    server_sock = socket(AF_INET, SOCK_STREAM, 0);
    if (server_sock < 0) {
        printf("Error creating server socket\n");
        exit(1);
    }
    
    // Bind the server socket to a port
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    server_addr.sin_port = htons(8000);
    if (bind(server_sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        printf("Error binding server socket to port\n");
        exit(1);
    }
    
    // Listen for incoming connections
    if (listen(server_sock, MAX_CLIENTS) < 0) {
        printf("Error listening for incoming connections\n");
        exit(1);
    }
    
    printf("Server started, listening on port 8000\n");
    
    // Accept incoming connections and handle them in separate threads
    while (1) {
        client_sock = accept(server_sock, (struct sockaddr *)&client_addr, &client_len);
        if (client_sock < 0) {
            printf("Error accepting incoming connection\n");
            continue;
        }
        
        printf("Client connected: %s:%d\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
        
        if (pthread_create(&tid[i], NULL, handle_client, &client_sock) != 0) {
            printf("Error creating thread\n");
            continue;
        }
        
        i++;
        if (i == MAX_CLIENTS) {
            i = 0;
            while (i < MAX_CLIENTS) {
                pthread_join(tid[i], NULL);
                i++;
            }
            i = 0;
        }
    }
    
    close(server_sock);
    return 0;
}

该代码创建了一个股票服务器，监听在8000端口，接收来自客户端的请求，并返回相应的股票价格。当有新的客户端连接时，将在单独的线程中进行处理，以便同时服务多个客户端。可以通过telnet或其他客户端程序连接到该服务器并发送请求，以测试其功能。