WordPress数据库错误: [Got error 28 from storage engine]
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WordPress数据库错误: [Got error 28 from storage engine]
SELECT t.*, tt.*, tr.object_id FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON t.term_id = tt.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('category', 'post_tag', 'post_format') AND tr.object_id IN (211) ORDER BY t.name ASC

套接字(Socket)【创建】 – Crazy knowledge base
Crazy knowledge base

套接字(Socket)【创建】

创建套接字的函数是socket(),函数原型为:

#include 
#include 
 
     int socket(int domain, int type, int protocol);

其中“int domain”参数表示套接字要使用的协议簇,协议簇的在“linux/socket.h”里有详细定义,常用的协议簇:

AF_UNIX(本机通信)
AF_INET(TCP/IP – IPv4)
AF_INET6(TCP/IP – IPv6)
其中“type”参数指的是套接字类型,常用的类型有:

SOCK_STREAM(TCP流)
SOCK_DGRAM(UDP数据报)
SOCK_RAW(原始套接字)
最后一个“protocol”一般设置为“0”,也就是当确定套接字使用的协议簇和类型时,这个参数的值就为0,但是有时候创建原始套接字时,并不知道要使用的协议簇和类型,也就是domain参数未知情况下,这时protocol这个参数就起作用了,它可以确定协议的种类。

socket是一个函数,那么它也有返回值,当套接字创建成功时,返回套接字,失败返回“-1”,错误代码则写入“errno”中。

创建套接字:


#include 
#include 
#include 
 
     int sock_fd_tcp;
     int sock_fd_udp;
 
     sock_fd_tcp = socket(AF_INET, SOCK_STREAM, 0);
     sock_fd_udp = socket(AF_INET, SOCK_DGRAM, 0);
 
     if(sock_fd_tcp < 0){
          perror("TCP SOCKET ERROR!\n");
          exit(-1);
     }
 
     if(sock_fd_udp < 0){
          perror("UDP SOCKET ERROR!\n");
          exit(-1);
     }
套接字(Socket)【创建】

WordPress数据库错误: [Got error 28 from storage engine]
SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON t.term_id = tt.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('category') AND tr.object_id IN (210) ORDER BY t.name ASC

WordPress数据库错误: [Got error 28 from storage engine]
SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON t.term_id = tt.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('category') AND tr.object_id IN (212) ORDER BY t.name ASC

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