ttdt_file_request(3) — Subroutines

CDE

NAME

ttdt_file_request − create and send a standard ToolTalk request about a file

SYNOPSIS

#include <tttk.h>
Tt_message ttdt_file_request(Tt_message context,
                             Tttk_op op,
                             Tt_scope scope,
                             const char ∗pathname,
                             Ttdt_file_cb cb,
                             void ∗client_data,
                             int send_and_destroy);

DESCRIPTION

The ttdt_file_request function is used to create (and optionally send) any of the standard Desktop file requests such as Get_Modified, Save, and Revert.

The ttdt_file_request function creates a request with the specified op and scope, and sets its file attribute to pathname. The function adds an unset argument of Tt_mode TT_IN and vtype File to the request, per the Desktop messaging conventions. If op is TTDT_GET_MODIFIED, ttdt_file_request also adds an unset TT_OUT argument of vtype Boolean to the request. The ttdt_file_request function installs cb as a message callback for the created request, and ensures that client_data will be passed into the callback. (The Ttdt_file_cb callback is described under ttdt_file_join(3)). If send is True, ttdt_file_request sends the request before returning the handle to it; otherwise, it only creates the request.

The context argument describes the environment to use. If context is not zero, messages created by ttdt_file_request inherit from context all contexts whose slotname begins with the characters ENV_.

RETURN VALUE

Upon successful completion, the ttdt_file_request function returns the created Tt_message; otherwise, it returns an error pointer. The application can use tt_ptr_error(3) to extract one of the following Tt_status values from the returned handle:

TT_ERR_DBAVAIL
The ToolTalk service could not access the ToolTalk database needed for this operation.

TT_ERR_DBEXIST
The ToolTalk service could not access the specified ToolTalk database in the expected place.

TT_ERR_NOMEM
There is insufficient memory available to perform the function.

TT_ERR_NOMP
The ttsession(1) process is not running and the ToolTalk service cannot restart it.

TT_ERR_OVERFLOW
The ToolTalk service has more active messages than it can handle. (The maximum number of active messages is implementation specific, but is at least 2000.)

TT_ERR_POINTER
The pathname argument was NULL or was a ToolTalk error pointer.

TT_ERR_PROCID
The specified process identifier is out of date or invalid.

APPLICATION USAGE

The ttdt_file_request function is a lower-level interface than ttdt_Get_Modified, ttdt_Save, and ttdt_Revert, since the latter functions create and send the request and then block on its reply.

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