Re: errors during bind

[Patrick Townsend <townsend@xxxxxxxxxxxxxx>]

Some thoughts on your questions:

1. You can sometimes get useful information on a bind error with the
strerror function:

     char *error_message;
     error_message = strerror(errno);

   Try this to see if their is more information about the bind error. It
might also
   help with the unknown error condition.

2. Set application logging on high, run the program again and check the
job log. Their is often
   useful information in the job log:

     chgjob log(4 0 *seclvl) logclpgm(*yes)
     call mypgm
     dspjoblog

3. I've used UNIX sockets on the AS/400 and you should be able to get
this to work. Check
   to be sure the file you are using does not already exist before the
bind (use unlink() or
   whatever...

Hope this helps,
Patrick

PhaniHR wrote:
> 
>      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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-- 

Patrick Townsend                       mailto:townsend@patownsend.com
Patrick Townsend & Associates, Inc.    http://www.patownsend.com
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