]]> ]]> tt_fd library call tt_fd return a file descriptor #include <Tt/tt_c.h> int tt_fd 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 &cdeman.tt.message.receive; to receive the message. Upon successful completion, the tt_fd function returns the file descriptor for the current procid. The application can use &cdeman.tt.int.error; to extract one of the following Tt_status values from the returned integer: TT_OK The operation completed successfully. TT_ERR_NOMP The &cdeman.ttsession; 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 TT_ERR_PROCID The current default process identifier is out of date or invalid. TT_ERR_SESSION The specified ToolTalk session is out of date or invalid. 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 &cdeman.tt.open;. &cdeman.Tt.tt.c.h;, &cdeman.tt.open;, &cdeman.tt.int.error;, &cdeman.tt.message.receive;.