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The current default process identifier is out of date or invalid.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The specified ToolTalk session is out of date or invalid.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).

SEE ALSO

tt_c(5), tt_open(3), tt_int_error(3), tt_message_receive(3).