errors during bind

[PhaniHR@xxxxxxx (PhaniHR)]

     Hi,
     
     We have this serious problem. Please help us to resolve this at this 
     earliest. We got the following errors during bind on AS/400
     
     - EINVAL (The value specified for the argument is not correct.) - 
     EUNKNOWN (Unknown system state.)
     
     These errors occured at different times and persisted for sometime. 
     EINVAL was solved by doing an IPL. But EUNKNOWN persisted even after 
     doing an IPL.
     
     
     Doubts :
     
     1. What does EUNKNOWN mean ?
     2. Under what conditions does EUNKNOWN occur during bind ? 3. What are 
     the corrective actions for EUNKNOWN ? 
     4. If EUNKNOWN error happens again, what are the steps we should take  
     in order to give more information to you ?
     5. What do we have to do to prevent EUNKNOWN from happening again ? 6. 
     What do we have to do to prevent EINVAL from happening again ?
     7. How can we find out whether a particular address (say, "RS2000" for 
     UDP socket) is already in use ? What we would like to know is how   we 
     can find from a program (say A) that a particular address is in  use 
     by a different program (say B).
     
     
     
     The code is as follows
     
     ....
     ....
     
     int CreateUDPSock(char * UDPFile)
     {
     struct sockaddr_un servaddr;
     int servlen, sockfd;
     
     memset(&servaddr,'\0', sizeof(servaddr)); servaddr.sun_family = 
     AF_UNIX; strcpy(servaddr.sun_path, UDPFile);
     servlen = SUN_LEN(&servaddr);
     
     if((sockfd=socket(AF_UNIX,SOCK_DGRAM,0)) < 0) { printf("Error opening 
     UDP socket\n"); return -1; }
     
     unlink(UDPFile);
     errno = 0;           /* Ignore the EBADF error */
     
     if(bind(sockfd,(struct sockaddr *)&servaddr,servlen) < 0) { 
     perror("error in bind");          /* ERROR noticed here */ return -1; 
     }
     
     return sockfd;
     }
     
     void main()
     {
     int sockfd;
     
     sockfd = CreateUDPSock("RS2000");
     ....
     ....
     }
     
     
     
     
     Best regards,
     
     Phaniraj
     
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