int t_optmgmt (fd, req, ret) int fd; struct t_optmgmt *req; struct t_optmgmt *ret;
The req and ret
arguments point to a
t_optmgmt structure containing the following
struct netbuf opt; long flags;The
optfield identifies protocol options, and the
flagsfield is used to specify the action to take with those options.
The options are represented by a netbuf
structure in a manner similar to the address in t_bind.
req is used to request a specific action of the provider and to
send options to the provider.
len specifies the number of bytes in the options,
buf points to the options buffer, and
maxlen has no meaning for the req argument.
The transport provider may return options and flag values
to the user through ret.
specifies the maximum size of the options buffer and
buf points to the buffer where the options are to be placed.
len specifies the number of bytes of options returned.
maxlen has no meaning for the req
argument, but must be set in the ret argument
to specify the maximum number of bytes the options buffer
The actual structure and content of the options is imposed by the
flags field of req
can specify one of the following actions:
flagsfield of ret either has T_SUCCESS or T_FAILURE set to indicate to the user whether the options are supported. These flags are only meaningful for the T_CHECK request.
optfield of ret. In req, the
optmust be zero, and the
buffield may be NULL.
If issued as part of the connectionless-mode service, t_optmgmt may block due to flow control constraints. The function does not complete until the transport provider has processed all previously sent data units.
AT&T SVID Issue 3
X/Open CAE Specification, Networking Services, Issue 4, 1994. ;
and Intel386 Binary Compatibility Specification, Edition 2 (iBCSe2) .