求帮助各位高手，C写程序来判断某端口能否被占用该怎么写
解决方案
15
int port = 8888;
int fd = socket(AF_INET, SOCK_STREAM, 0);
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
inet_pton(AF_INET, "0.0.0.0", &addr.sin_addr);
if(bind(fd, (struct sockaddr *)(&addr), sizeof(sockaddr_in)) < 0)
{
printf("port %d has been used.\n", port);
}
close(fd);
15
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define MAXLINE 80
int main(void)
{
struct sockaddr_in servaddr;
int sockfd,i,serverport,ret;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
inet_pton(AF_INET, "127.0.0.1", &servaddr.sin_addr);
for(i = 0;i < 65535;i++)
{
servaddr.sin_port = htons(i);
ret = connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
if(EISCONN == ret)
{
printf("端口 %d被占用",i);
}
else
{
close(sockfd);
}
}
return 0;
}
10
system("netstat -na >netstat.txt");
//然后读文件netstat.txt的内容
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