Standards
| Standards / Extensions |
C or C++ |
Dependencies |
|---|
| z/OS® UNIX |
both |
|
Format
#define _OPEN_SYS_SOCK_EXT
#include <sys/socket.h>
int setibmopt(int cmd, struct ibm_tcpimage *bfrp);
General
description
The setibmopt() function call is used to set TCP/IP options. Currently,
the only supported command is IBMTCP_IMAGE which allows the setibmopt()
to choose the active TCP/IP image stack the application will connect
to.
To reset ibm_tcpimage to nothing chosen, set the name to
all blanks.
The chosen transport is inherited over fork() and preserved over
exec(). If this is not desired, the child process should call setibmopt()
with a blank name to reset the TCP/IP image for the child.
- Parameter
- Description
- cmd
- The value in cmd must be set to the command to be performed.
Currently, only IBMTCP_IMAGE is supported and must be paired with
the bfrp parameter as described.
- bfrp
- The pointer to a ibm_tcpimage structure.
To set the TCP/IP image for a socket, the application should set
values in the ibm_tpcimage structure as follows:
- Element
- Description
- status
- 0 means is not known and need not be checked. Currently, this
is the only value with meaning.
- version
- 0 means the version is to be set on return if known.
- name
- The name must be left justified, uppercase, padded with blanks,
and be the name of an active TCP stack.
Returned value
If successful, setibmopt() returns 0.
If unsuccessful, setibmopt() returns -1 and sets errno to one of
the following values:
- Error Code
- Description
- EFAULT
- Using the bfrp supplied would result in access of a
storage location that is inaccessible.
- EIBMBADTCPNAME
- A name of a PFS was specified that either is not configured
or is not a Sockets PFS.
- EOPNOTSUPP
- The cmd is a function that is not supported.
- ENXIO
- The name that was specified did not match an AF_INET socket
stack, but Common Inet is not configured on this system. Because this
system does not have multiple AF_INET socket transports configured,
there is already a natural affinity to one single stack, and this
failure may not be a problem for the application.