This is my code which can run CentOS and Windows just fixing some headers.
#define _WIN32_WINNT 0x0501
#include <WinSock2.h>
#include <WS2tcpip.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
/*
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
*/
int main()
{
int sock;
int ret = 0;
int port= 12345;
struct sockaddr_in addr;
char buf[1024];
WSADATA wsaData;
WSAStartup(MAKEWORD(2,2), &wsaData);
sock = socket(AF_INET, SOCK_STREAM, 0);
if(sock<0){
printf("socket() ret = %d : %s\n",ret,strerror(errno));
return ret;
}
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = INADDR_ANY;
ret = bind(sock, (struct sockaddr *)&addr, sizeof(addr));
if(ret<0){
printf("bind() ret = %d errno =%d : %s\n",ret,errno,strerror(errno));
return ret;
}
printf("############# Binding port %d type Enter to stop \t",port);
fgets(buf,sizeof(buf),stdin);
return 0;
}
When I tried to bind same port by this program with runing tow process, there must be the messages that Address already in use like below.
[The first proc@centOS ]
$ ./udp
############# Binding port 12345 type Enter to stop
[The second proc@centOS]
$ ./udp
bind() ret = -1 errno =98 : Address already in use
$
However when I do same thing with same code on windows, message is different.
[The first proc@windows]
C:\ >udp
############# Binding port 12345 type Enter to stop
[The second proc@windows]
C:\ >udp
bind() ret = -1 errno =34 : Result too large
C:\ >
How can I get Address already in use on Windows?