tt_fd(library call) tt_fd(library call)
NAMEtt_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 descrip‐
tor 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 ser‐
vice 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The current default process identifier is out of date or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The specified ToolTalk session is out of date or invalid.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/tt_c.h - Tttt_c(5), tt_open(3), tt_int_error(3), tt_mes‐
sage_receive(3).
tt_fd(library call)