Name

XtAppAddInput, XtRemoveInput − register and remove an input source

Syntax

XtInputId XtAppAddInput(app_context, source, condition, proc, client_data)
      XtAppContext app_context;
      int source;
      caddr_t condition;
      XtInputCallbackProc proc;
      caddr_t client_data;

void XtRemoveInput(id)
      XtInputId id;

Arguments

app_contextSpecifies the application context that identifies the application. 

client_dataSpecifies the argument that is to be passed to the specified procedure when input is available. 

conditionSpecifies the mask that indicates a read, write, or exception condition or some operating system dependent condition. 

idSpecifies the ID returned from the corresponding XtAppAddInput call.

procSpecifies the procedure that is to be called when input is available. 

sourceSpecifies the source file descriptor on a UNIX-based system or other operating system-dependent device specification. 

Description

The XtAppAddInput function registers with the Intrinsics read routine a new source of events, which is usually file input but can also be file output. Note that file should be loosely interpreted to mean any sink or source of data. XtAppAddInput also specifies the conditions under which the source can generate events. When input is pending on this source, the callback procedure is called.

The legal values for the condition argument are operating-system dependent.  On a UNIX-based system, the condition is some union of XtInputReadMask, XtInputWriteMask, and XtInputExceptMask. The XtRemoveInput function causes the Intrinsics read routine to stop watching for input from the input source.

See Also

XtAppAddTimeOut(3Xt)
Guide to the XUI Toolkit Intrinsics
Guide to the Xlib Library