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Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - Servers and Systems Software
Product family - z Systems Software
Product - z/OS Communications Server
For recording keeping, the previous attributes were:
Brand - WebSphere
Product family - Enterprise Networking
Product - z/OS Communications Server
As stated in one of the comments above, we believe this requirement is addressed by function provided in z/OS V2R1 CS.
Please review the previous update and let us know whether the alternatives described meet your requirement. Thank you!
This feature is available in z/OS V2R1 Comm Server. Two new options (CONNECTTIMEOUT and CONNECTINITINTERVAL on TCPCONFIG statement) were introduced to allow customization of the TCP connection establishment timeout. The CONNECTTIMEOUT parameter allows you to specify the overall timeout value for connect processing. Also in this release the default timeout for connection establishment was reduced to 75 seconds from 3 minutes. Here's a link to the documentation of these new parameters:
https://nsjazz.raleigh.ibm.com:8038/ccm/web/projects/RFE%20for%20ENS#action=com.ibm.team.workitem.viewWorkItem&id=31010
Also note that an application using the sockets API can overide how long it waits for TCP connections to be established when it is acting as a client. Below are the steps that can be used to customize the timeout value on an application basis (the examples/references are for CICS sockets but these concepts apply to other socket APIs as well):
1) To set a socket in non-blocking mode or blocking mode: Use FCNTL call. Alternatively can use IOCTL call for the same purpose. Note, the socket should be placed in non-blocking mode before issuing the CONNECT API. Here's a pointer to the z/OS V1R13 IP CICS Sockets publication that describes this API:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/f1a1g170/8.6.6?SHELF=all13be9&DT=20100603025010
2) Issue CONNECT call. The call will complete immediately with an ERRNO of 36 (EINPROGRESS). This indicates that the CONNECT has been scheduled. Here's pointer to the ERRNO descriptions:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/f1a1g170/B.1?SHELF=all13be9&DT=20100603025010&CASE=
3) Issue SELECT call, specifying the Write bit mask for the socket descriptor in question and specify a TIMEOUT value of how long you are willing to wait for completion of the connect. When SELECT returns, RETCODE indicates the result:
> 0 - indicates the number of conditions (based on the input bit masks) that were met
0 - No conditions met, the call timeout
- 1 - An error occured (ERRNO reflects the error).
Documentation for SELECT:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/f1a1g170/8.6.30?SHELF=all13be9&DT=20100603025010
Note, manipulating bit strings can be complicated in COBOL. As a result some helper routines are provided, see EZACIC06 program:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/f1a1g170/8.7.5?SHELF=all13be9&DT=20100603025010
Finally, we do provide some sample code in the manual for a COBOL program invoking SELECTEX (variation of SELECT). See the following link:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/f1a1g170/E.7?SHELF=all13be9&DT=20100603025010
4) After the select is completed, need to ensure that the socket is turned back into blocking mode if that is what the remaining code expects (using the FCNTL call above). Or if you stay in non-blocking mode, then you would need to make use of SELECT to determine when it is time to read from the socket, etc.
Does this information satisfy your request? If not, can you clarify what is missing? Thanks!
Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - WebSphere
Product family - Enterprise Networking
Product - z/OS Communications Server
Component - TCP/IP
Operating system - IBM z/OS
For recording keeping, the previous attributes were:
Brand - Servers and Systems Software
Product family - zSeries Software
Product - z/OS
Component - Other
Operating system - IBM z/OS
Creating a new RFE based on Community RFE #63590 in product z/OS.