topic Re: getpeername API() in Operating System - HP-UX

getpeername API()

Shweta_3 — Wed, 08 Feb 2006 01:08:12 GMT

I am using the API getpeername() in my multi-threaded application.

The API returns with return code zero, however does not fill in the struct addr or value of length.

Is this an expected behavior by the API, else, what could I suspect?
The other APIs like getsockname() etc return correct value just before this call. So if their is a issue with the peer socket, it would report it, right?

I am setting the length to the struct sockaddr before calling the API, which is reset to zero post call.

Any pointers/ link to known issues/ patches required will be of help.

Thanks,
Shweta

Re: getpeername API()

Muthukumar_5 — Wed, 08 Feb 2006 01:29:25 GMT

which operating system you are using? Is it your own application or from any third party or build in? Do you have the code for getpeername() call?

--
Muthu

Re: getpeername API()

Arunvijai_4 — Wed, 08 Feb 2006 02:32:25 GMT

Hi Shweta,

Hope you are using HP-UX. Take a look at this links, it may help you if you are transisting your apps from Solaris to HP-UX or Linux to HP-UX.

http://devrsrc1.external.hp.com/STKS/cgi-bin/man2html?debug=0&manpage=/usr/share/man/man2.Z/getpeername.2
http://devrsrc1.external.hp.com/STKL/impacts/i38.html

-Arun

Re: getpeername API()

Shweta_3 — Wed, 08 Feb 2006 04:09:03 GMT

Thanks, and sorry for not being more specific.
Yes I am running this on a HP-UX B.11.11 U 9000/800

I did go though the manual page, however didn't catch anything in particular.

Using a simple socket program, the API does return having filled in the addr structure properly. However not in my application, I am not sure what to suspect.
I tried both the combinations
a)
struct sockaddr and sizeof(struct sockaddr)
b)
struct sockaddr_un and sizeof(struct sockaddr_un)

Anything more I may provide?

Re: getpeername API()

Arunvijai_4 — Wed, 08 Feb 2006 04:15:22 GMT

Hi Shweta,

It could be due to incompatible types, if possible attach your sample code to take a look at it.

-Arun

P.S Assign points.

Re: getpeername API()

rick jones — Wed, 08 Feb 2006 20:50:49 GMT

When you are compiling your multi-threaded application, are you setting -D_REENTRANT? You are linking against -lpthread right?

Have you looked at your application's getpeername() call in a verbose tusc trace (tusc -v)?

BTW, unless you are completely disassociated from the code that made the accept() call, you should already have the peer information from what is returned by the accept() call (or for that matter from what you passed-in to a connect() call)

Also, you might check what sizeof(struct sockaddr) happens to be comapred with sizeof (struct sockaddr_in) if this is an IPv4 application or struct sockaddr_in6 if this is IPv6...