Linux Socket 学习笔记6–初始化Internet地址

struct sockaddr_in adr_inet;
 
int addr_len;
 
menset(&adr_inet,0,sizeof(adr_inef));
 
addr_inet.sin_family=AF_INET;
 
addr_inet.sin_port=ntohs(0);
 
addr_inet.sin_addr.s_addr=ntohl(INADDR_ANY);
 
adr_len=sizeof(adr_inet);

/*
* Establishing a Specific AF_INET
* Socket Address:
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
/*
* This function reports the error and
* exits back to the shell :
*/
static void
bail(const char *on_what) {
perror(on_what);
exit(1);
}
 
int main(int argc,char **argv,char **envp) {
int z;           /* Status return code */
int sck_inet;               /* Socket  */
struct sockaddr_in adr_inet;/* AF_INET */
int len_inet;               /* length  */
const unsigned char IPno[] = {
127, 0, 0, 23    /* Local loopback */
};
 
/* Create an IPv4 Internet Socket */
sck_inet = socket(AF_INET,SOCK_STREAM,0);
 
if ( sck_inet == -1 )
bail("socket()");
 
/* Create an AF_INET address */
memset(&amp;adr_inet,0,sizeof adr_inet);
 
adr_inet.sin_family = AF_INET;
adr_inet.sin_port = htons(9000);
memcpy(&amp;adr_inet.sin_addr.s_addr,IPno,4);
len_inet = sizeof adr_inet;
 
/* Now bind the address to the socket */
z = bind(sck_inet,(struct sockaddr *)&amp;adr_inet,len_inet);
 
if ( z == -1 )
bail("bind()");
 
/* Display all of our bound sockets */
system("netstat -pa --tcp 2&gt;/dev/null | "
"sed -n '1,/^Proto/p;/af_inet/p'");
 
close(sck_inet);
return 0;
}