tt_pattern_arg_add(3) ToolTalk Functions tt_pattern_arg_add(3)NAMEtt_pattern_arg_add - add an argument to a pattern
SYNOPSIS
#include <Tt/tt_c.h>
Tt_status tt_pattern_arg_add(Tt_pattern p,
Tt_mode n,
const char *vtype,
const char *value);
DESCRIPTION
The tt_pattern_arg_add() function adds an argument to a pattern. The
application must add pattern arguments before it registers the pattern
with the ToolTalk service.
The p argument is the opaque handle for the pattern involved in this
operation The n argument specifies who (sender, handler, observers)
writes and reads a message argument. The following modes are defined:
TT_IN The argument is written by the sender and read by the han‐
dler and any observers.
TT_OUT
The argument is written by the handler and read by the
sender and any reply observers.
TT_INOUT
The argument is written by the sender and the handler and
read by all.
The vtype argument describes the type of argument data being added.
The type ALL matches any argument value type. The value argument is
the value to fill in. This value must be an unsigned character string.
A NULL matches any value.
Pattern arguments are positional paramaters, and thus will only match
an incoming message if the arguments have the same type and position
within the argument list of the incoming message. In order to match an
argument which is not the first in a list of arguments, the programmer
must use tt_pattern_arg_add(3) to register wildcard arguments for the
intervening arguments between the first argument and the argument which
it is desired to match on. Wildcard arguments should have the vtype of
"ALL" and a value of NULL.
RETURN VALUE
Upon successful completion, the tt_pattern_arg_add() function returns
the status of the operation as one of the following Tt_status values:
TT_OK The operation completed successfully.
TT_ERR_NOMP
The ttsession(1) process is not running and the ToolTalk
service cannot restart it.
TT_ERR_POINTER
The pointer passed does not point to an object of the cor‐
rect type for this operation.
SEE ALSOtt_c(5), tt_pattern_register(3), tt_pattern_barg_add(3), tt_pat‐
tern_iarg_add(3).
ToolTalk 1.3 1 March 1996 tt_pattern_arg_add(3)
