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//demo.cpp
#include <stdio.h>
#include <netdb.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <linux/tcp.h>
int SockDemo()
{
sockaddr_in in;
memset(&in,'\0',sizeof(in));
in.sin_family=AF_INET;
in.sin_port=htons(8880);
in.sin_addr.s_addr=INADDR_ANY;
int reuse0=1;
int serv=socket(AF_INET, SOCK_STREAM, 0);
if (setsockopt(serv, SOL_SOCKET, SO_REUSEADDR, (char *)&reuse0, sizeof(reuse0))==-1) return errno;
if (bind(serv, (sockaddr*)&in, sizeof(sockaddr)) == -1) return errno;
if (listen(serv, SOMAXCONN)==-1) return errno;
int reuse1=1;
int client=socket(AF_INET, SOCK_STREAM, 0);
if (setsockopt(client, SOL_SOCKET, SO_REUSEADDR, (char *)&reuse1, sizeof(reuse1))==-1) return errno;
if (bind(client, (sockaddr*)&in, sizeof(sockaddr)) == -1) return errno;
//****** 此处为报错 *****:errno=98, Address already in use.
sleep(1);
close(client);
close(serv);
return 0;
}
int main(int argc, char *argv[])
{
int errcode=SockDemo();
printf("errno=%d, %s.\n", errcode, strerror(errcode));
return 0;
}