服务器套接字errno 57 - 套接字未连接

Question

由于某种原因，我收到错误57-套接字未连接。

为什么？

控制台输出：

GET/HTTP/1.1 
Host: localhost:8080 
Connection: keep-alive 
Cache-Control: max-age=0 
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.117 Safari/537.36 
Accept-Encoding: gzip,deflate,sdch 
Accept-Language: en-US,en;q=0.8,it;q=0.6,lt;q=0.4,nl;q=0.2,ru;q=0.2 

Can't write to socket 57 

代码：

#include <sys/types.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include <arpa/inet.h> 
#include <unistd.h> 

#include <errno.h> 

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 

#define PORT 8080 
#define PROTOCOL 0 
#define BACKLOG 10 
#define BUFLEN 1500 

void str_server(int sock) 
{ 
    char buf[1025]; 
    const char* filename = "index.html"; 
    FILE *file = fopen(filename, "rb"); 
    if (!file) 
    { 
     printf("Can't open file for reading"); 
     return; 
    } 
    while (!feof(file)) 
    { 
     int rval = fread(buf, 1, sizeof(buf), file); 
     if (rval < 1) 
     { 
     printf("Can't read from file"); 
     fclose(file); 
     return; 
     } 

     int off = 0; 
     do 
     { 
      int sent = send(sock, &buf[off], rval - off, 0); 
      if (sent < 1) 
      { 
       printf("Can't write to socket %d", errno); 
       fclose(file); 
       return; 
      } 

      off += sent; 
     } 
     while (off < rval); 
    } 

    fclose(file); 
} 

int main() 
{ 
    int fd; 
    int connfd; 

    // For bind() 
    struct sockaddr_in addr; 

    // For accept() 
    struct sockaddr_in cliaddr; 
    socklen_t cliaddrlen = sizeof(cliaddr); 

    // For reading and writing 
    ssize_t i; 
    ssize_t rcount; 
    char buffer[BUFLEN]; 

    // Open a socket 
    fd = socket(AF_INET, SOCK_STREAM, PROTOCOL); 
    if (fd == -1) { 
    printf("Error: unable to open a socket\n"); 
    printf("Error code: %d\n", errno); 
    exit(1); 
    } 

    // Create an address 
    //memset(&addr, 0, sizeof addr); 
    addr.sin_addr.s_addr = INADDR_ANY; 
    addr.sin_family = AF_INET; 
    addr.sin_port = htons(PORT); 

    int yes = 1; 
    if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) 
    { 
     perror("setsockopt"); 
    } 

    if ((bind(fd, (struct sockaddr *)&addr, sizeof(addr))) == -1) { 
    printf("Error: unable to bind\n"); 
    printf("Error code: %d\n", errno); 
    exit(1); 
    } 

    // List for connections 
    if ((listen(fd, BACKLOG)) == -1) { 
    printf("Error: unable to listen for connections\n"); 
    printf("Error code: %d\n", errno); 
    exit(1); 
    } 

    // Accept connections 
    connfd = accept(fd, (struct sockaddr *) &cliaddr, &cliaddrlen); 
    if (connfd == -1) { 
    printf("Error: unable to accept connections\n"); 
    printf("Error code: %d\n", errno); 
    exit(1); 
    } 

    // Read data 
    rcount = read(connfd, buffer, BUFLEN); 
    if (rcount == -1) {  
    printf("Error: unable to accept connections\n"); 
    printf("Error code: %d\n", errno); 
    exit(1); 
    } 

    for (i = 0; i < rcount; i++) { 
    printf("%c", buffer[i]); 
    } 

    //write(connfd, buffer, rcount); 
    str_server(fd); 


    // Bye 
    //close(connfd); 
    return 0; 
} 

Answer 1

你发送到监听套接字，当你要发送到接受/连接的一个。

为了解决这个问题通过连接插座：

str_server(connfd);