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error binding try to communicate on IRIX

hanan
hanan asked
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Last Modified: 2013-12-23
You ask...
              What am I doing wrong ? My code is :

              include <fcntl.h>
              #include <unistd.h>
              #include <stdio.h>
              #include <stdlib.h>
              #include <sys/types.h>
              #include <stdio.h>
              #include <stdlib.h>
              #include <sys/types.h>
              #include <sys/uio.h>
              #include <bstring.h>
              #include <sys/time.h>
              #include <netinet/in.h>
              #include <sys/socket.h>
              #include <string.h>
              #include <iostream.h>
              #include <errno.h>
              extern "C" {
              extern unsigned int inet_addr(char *string);
              }

              void main()
              {
              int SockFd,Rc,NewFd,len,lis;
              int Port = 9989;
              char addr[20] = "192.114.248.101";
              struct sockaddr_in in;

              //init sockaddr_in fields
              in.sin_family = AF_INET;
              cout << "in.sin_family = " << in.sin_family << "\n";
              in.sin_addr.s_addr = inet_addr(addr);
              cout << "in.sin_addr.s_addr = " << in.sin_addr.s_addr <<
              "\n";
              in.sin_port = htons(Port);
              cout << "in.sin_port = " << in.sin_port << "\n";

              // create socket
              SockFd = socket(AF_INET,SOCK_STREAM,0);
              cout << "SockFd is : " << SockFd << "\n";

              // make the binding
              //fcntl(SockFd,F_SETFL,FNDELAY);
              //unlink(sin.sa_data);
              Rc = bind(SockFd,(struct sockaddr_in *)&in
              ,sizeof(sockaddr_in));
              cout << "Rc is : " << Rc << "\n";
              cout << "Error is : " << strerror(errno) << "\n";

              close(SockFd);
              }



              The result I get is :

              n.sin_family = 2
              in.sin_addr.s_addr = 3228760165
              in.sin_port = 9989
              SockFd is : 3
              Rc is : -1
              Error is : Cannot assign requested address


              what should i do.
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Commented:
This will only work if you're running this program on hds1.mta.ac.il [192.114.248.101]

Unless your system is multi-homed, its best to specify INADDR_ANY
as the sin_addr.s_addr, allowing your OS to assign the local
endpoint IP Address. INADDR_ANY is usually = 0.

If you are multi-homed, you must be certain that the address you
are requesting is assigned to a valid and active interface on your system.

Also, you may need to ntohl() the s_addr value. I don't think you
do, but you can try that if you're certain the IP address you're
trying to use is valid for your system.

Note also that if this is the server-side of a future connection,
and you're planning to call getsockname() to find out what
IP address has been assigned (if you're multi-homed), you really
can't call getsockname until a socket has been connected, and
you must call getsockname on that newly accepted socket, not
the listening socket.

Summary: Use INADDR_ANY as the s_addr value, not a specific value.

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