Parameters placement on stack in C Post: 303036086

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Top Forums Programming Parameters placement on stack in C Post 303036086 by Don Cragun on Thursday 13th of June 2019 09:28:00 PM

06-13-2019

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The standards don't specify how parameters are placed on the stack when a function is invoked and any code that assumes that parameters are placed on the stack in the order given (or in the reverse of the order given) in the function declaration is highly likely to fail on some operating systems on some hardware.

When an operating system is ported to or designed from scratch, the compiler group, the link editor group, and the operating system group will study the hardware design documents and agree on a scheme that they believe will be fast and conserve space on that hardware for the operating system being designed. Note that the scheme may well have exceptions that apply alternative behaviors when a function is invoked that takes a variable number of parameters (e.g., printf()). The only portable way to write functions like printf() is to use the macros defined in the Standard C header <stdarg.h> (i.e., va_start, va_arg, va_copy, and va_end).

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LEARN ABOUT OSF1

xmdropsiteconfigurestackingorder

XmDropSiteConfigureStackingOrder(3X)									      XmDropSiteConfigureStackingOrder(3X)

NAME

       XmDropSiteConfigureStackingOrder - A Drag and Drop function that reorders a stack of widgets that are registered drop sites

SYNOPSIS

       #include <Xm/DragDrop.h>

       void XmDropSiteConfigureStackingOrder (widget, sibling, stack_mode)
	       Widget widget;
	       Widget sibling;
	       Cardinal stack_mode;

DESCRIPTION

       XmDropSiteConfigureStackingOrder  changes  the stacking order of the drop site specified by widget.  The stacking order controls the manner
       in which drag-under effects are clipped by overlapping siblings, regardless of whether they are active.	The stack mode is relative  either
       to the entire stack, or to another drop site within the stack.  The stack order can be modified only if the drop sites are siblings in both
       the widget and drop site hierarchy, and the widget parent of the drop sites is registered as a composite drop  site.   Specifies  the  drop
       site to be restacked.  Specifies a sibling drop site for stacking operations.  If specified, then widget is restacked relative to this drop
       site's stack position.  Specifies the new stack position for the specified widget.  The values are XmABOVE and XmBELOW.	If  a  sibling	is
       specified, then widget is restacked as follows: The widget is placed just above the sibling.  The widget is placed just below the sibling.

	      If  the  sibling parameter is not specified, then widget is restacked as follows: The widget is placed at the top of the stack.  The
	      widget is placed at the bottom of the stack.

       For a complete definition of DropSite and its associated resources, see XmDropSite(3X).

SEE ALSO

       XmDropSite(3X), XmDropSiteRetrieve(3X), XmDropSiteQueryStackingOrder(3X)

													      XmDropSiteConfigureStackingOrder(3X)