tt_fd(3)

NAME

tt_fd − return a file descriptor

SYNOPSIS

#include <Tt/tt_c.h>
int tt_fd(void);

DESCRIPTION

The tt_fd() function returns a file descriptor. The returned file descriptor alerts the process that a message has arrived for the default procid in the default session.

File descriptors are either active or inactive. When the file descriptor becomes active, the process must call tt_message_receive(3) to receive the message.

RETURN VALUE

Upon successful completion, the tt_fd() function returns the file descriptor for the current procid. The application can use tt_int_error(3) to extract one of the following Tt_status values from the returned integer:

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_PROCID
The current default process identifier is out of date or invalid.

TT_ERR_SESSION
The specified ToolTalk session is out of date or invalid.

APPLICATION USAGE

The application must have a separate file descriptor for each procid. To get an associated file descriptor, the application should use tt_fd() each time it calls tt_open(3).

Museum