编写C语言客户端自定义带宽的例子.

非常感谢您的问题。下面是一个简单的C语言客户端自定义带宽的例子：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <string.h>
#include <time.h>

#define PORT 8080

int main(int argc, char *argv[]) {
    int sockfd;
    struct sockaddr_in serveraddr;
    struct hostent *server;
    char buffer[256];

    if (argc < 2) {
        printf("Usage: %s hostname\n", argv[0]);
        exit(1);
    }

    sockfd = socket(AF_INET, SOCK_STREAM, 0);

    if (sockfd < 0) {
        perror("ERROR opening socket");
        exit(1);
    }

    server = gethostbyname(argv[1]);

    if (server == NULL) {
        fprintf(stderr,"ERROR, no such host\n");
        exit(1);
    }

    bzero((char *) &serveraddr, sizeof(serveraddr));
    serveraddr.sin_family = AF_INET;
    bcopy((char *)server->h_addr,
          (char *)&serveraddr.sin_addr.s_addr,
          server->h_length);
    serveraddr.sin_port = htons(PORT);

    if (connect(sockfd,(struct sockaddr *) &serveraddr,sizeof(serveraddr)) < 0) {
        perror("ERROR connecting");
        exit(1);
    }

    printf("Please enter the input string: ");
    bzero(buffer,256);
    fgets(buffer,255,stdin);

    clock_t start = clock();
    int n = write(sockfd, buffer, strlen(buffer));
    clock_t end = clock();
    double elapsed_time = ((double) (end - start)) / CLOCKS_PER_SEC;

    printf("Sent %d bytes in %f seconds\n", n, elapsed_time);

    bzero(buffer,256);
    n = read(sockfd,buffer,255);

    if (n < 0) {
        perror("ERROR reading from socket");
        exit(1);
    }

    printf("%s\n",buffer);

    close(sockfd);
    return 0;
}

这个例子使用了C语言的socket库来发送字符串，同时记录了发送的时间和发送的字节数。如果您有任何问题，请随时问我哦。