如何在HP-UX上通过TCPIP协议传输文件？

本示例代码演示了如何通过TCP/IP协议在HP-UX系统下传输文件。实现方式是使用socket编程，创建客户端和服务端，通过套接字通信完成文件传输。附有详细的注释。

客户端：

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

#define PORT 5000
#define BUFSIZE 1024

void error(char *msg)
{
    perror(msg);
    exit(1);
}

int main(int argc, char *argv[])
{
    int sockfd, n, count = 0;
    struct sockaddr_in serv_addr;
    struct hostent *server;
    char buffer[BUFSIZE];
    FILE *fp;

    if (argc != 3) {
        fprintf(stderr,"usage %s hostname filename\n", argv[0]);
        exit(1);
    }

    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0)
        error("ERROR opening socket");

    server = gethostbyname(argv[1]); //通过hostname获取主机名
    if (server == NULL) {
        fprintf(stderr,"ERROR, no such host\n");
        exit(0);
    }

    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    bcopy((char *)server->h_addr,
          (char *)&serv_addr.sin_addr.s_addr,
          server->h_length);
    serv_addr.sin_port = htons(PORT);

    if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
        error("ERROR connecting");

    fp = fopen(argv[2], "rb");
    if (fp == NULL)
        error("ERROR opening file");

    while(!feof(fp)) {
        memset(buffer, 0, BUFSIZE);
        n = fread(buffer, 1, BUFSIZE, fp);
        if (n < 0)
            error("ERROR reading from file");
        count += send(sockfd, buffer, n, 0);
        if (count < 0)
            error("ERROR writing to socket");
    }

    fclose(fp);
    close(sockfd);
    return 0;
}

服务端：

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

#define PORT 5000
#define BUFSIZE 1024

void error(char *msg)
{
    perror(msg);
    exit(1);
}

int main(int argc, char *argv[])
{
    int sockfd, newsockfd, n, count = 0;
    socklen_t clilen;
    struct sockaddr_in serv_addr, cli_addr;
    char buffer[BUFSIZE];
    FILE *fp;

    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0)
        error("ERROR opening socket");

    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = INADDR_ANY;
    serv_addr.sin_port = htons(PORT);

    if (bind(sockfd, (struct sockaddr *) &serv_addr,
             sizeof(serv_addr)) < 0)
        error("ERROR on binding");

    listen(sockfd, 5);

    clilen = sizeof(cli_addr);
    newsockfd = accept(sockfd,
                       (struct sockaddr *) &cli_addr,
                       &clilen);
    if (newsockfd < 0)
        error("ERROR on accept");

    fp = fopen("output.bin", "wb");
    if (fp == NULL)
        error("ERROR opening file");

    while ((n = recv(newsockfd, buffer, BUFSIZE, 0)) > 0) {
        count += fwrite(buffer, 1, n, fp);
        if (count < 0)
            error("ERROR writing to file");
    }

    fclose(fp);
    close(newsockfd);
    close(sockfd);
    return 0;
}

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