socket小程序，变量莫名其妙改变
客户端：
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <pthread.h>
#include <errno.h>

void* client(void* p)
{
int sockfd, new_fd, i=0, j=0, nbytes;
struct sockaddr_in s_addr;
struct sockaddr_in c_addr;
char *tmp=(char*)p;

char ip[20],port[6];

while(tmp[i]!= ': ')
{
ip[i]=tmp[i];
i++;
}
ip[i++]= '\0 ';

while(tmp[i]) port[j++]=tmp[i++];
port[j]= '\0 ';


for (i=0; i <10000; ++i)
{
sockfd=socket(AF_INET, SOCK_STREAM, 0);
if (sockfd==-1)
{
printf( "Client Error. %s\n ", strerror(errno));
return;
}

s_addr.sin_family = AF_INET;
s_addr.sin_port = htons(atoi(port));//第二次循环的时候，port变了
s_addr.sin_addr.s_addr = inet_addr(ip);
bzero(&(s_addr.sin_zero), sizeof(s_addr.sin_zero));


while (connect(sockfd, (struct sockaddr *)&s_addr, sizeof(struct sockaddr))==-1)
{
printf( "Client Error. %s\n ", strerror(errno));
}

char buffer[10];

if((nbytes=read(sockfd,buffer,1024))==-1)
{
printf( "Client Error. %s\n ", strerror(errno));
}

if (buffer[0]== 'M ')
printf( "%s\n ",buffer);

close(sockfd);
}
return;
}


int main(int argc, char* argv[])
{

if (argc <2)
{
printf( "Usage: 1.out server 's IP:server 's port ");
printf( "Example: 1.out 192.168.0.1:4444\n ");
return -1;
}

client(argv[1]);

return 0;
}
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服务器端：
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <pthread.h>
#include <errno.h>

void* server(void* p)
{
int sockfd, new_fd, i=0, j=0;
struct sockaddr_in s_addr;
struct sockaddr_in c_addr;
char *tmp=(char*)p;

char ip[20],port[6];

while(tmp[i]!= ': ')
{
ip[i]=tmp[i];
i++;
}
ip[i++]= '\0 ';

while(tmp[i]) port[j++]=tmp[i++];
port[j]= '\0 ';

sockfd=socket(AF_INET, SOCK_STREAM, 0);
if (sockfd==-1)
{
printf( "Server Error. %s\n ", strerror(errno));
return;
}

s_addr.sin_family = AF_INET;
s_addr.sin_port = htons(atoi(port));
s_addr.sin_addr.s_addr = inet_addr(ip);
bzero(&(s_addr.sin_zero), sizeof(s_addr.sin_zero));

if (bind(sockfd, (struct sockaddr *)&s_addr, sizeof(struct sockaddr))==-1)
{
printf( "Server Error. %s\n ", strerror(errno));

return;
}

if (listen(sockfd, 500)==-1)
{
printf( "Server Error. %s\n ", strerror(errno));
return;
}

char s[32], c[6];

for (i=0; i <10000; ++i)
{
s[0]= '\0 ';
if (i%3==0) strcpy(s, "M ");
sprintf(c, "%d ",i);
strcat(s, c);
strcat(s, "\n ");

if ((new_fd = accept(sockfd, NULL, NULL))==-1)
printf( "Server Error. %s\n ", strerror(errno));
printf( "%s\n ", s);
write(new_fd, s, sizeof(s));
close(new_fd);
}

close(sockfd);
return;
}


int main(int argc, char* argv[])
{

if (argc <2)
{
printf( "Usage: 1.out server 's IP:server 's port client 's ");
printf( "Example: 1.out 192.168.0.1:4444\n ");
return -1;
}

server(argv[1]);

return 0;
}
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用gdb跟踪客户端程序，发现port自己变了，导致connect失败，不知道为何
gcc 3.2.2

[解决办法]
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