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help with data type sizes
Post 302488837 by Driver on Tuesday 18th of January 2011 02:23:59 PM
01-18-2011
I guess what prompted all this was the following remark (which I might even have overlooked since I didn't read the entire thread in detail):
Certainly I agree that the properties of scope, duration and even limitations should be understood.
However I disagree that the address space layout is a good tool to do this.
The address printed by the original poster happened to have a "high" address, so high that it will have the sign bit set if looked at through a signed integer. That is all there is to know at this (and most any) stage, IMO (which you are free to disagree with and I'm not going to argue about
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Quote:
Since they're in stack space their addresses are very high, and end up flipping over to negative when you print them as signed integers.
However I disagree that the address space layout is a good tool to do this.
The address printed by the original poster happened to have a "high" address, so high that it will have the sign bit set if looked at through a signed integer. That is all there is to know at this (and most any) stage, IMO (which you are free to disagree with and I'm not going to argue about
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LEARN ABOUT SUNOS
m_getvalues_layout
m_getvalues_layout(3LAYOUT) Layout Service Library Functions m_getvalues_layout(3LAYOUT) NAME
m_getvalues_layout - query layout values of a LayoutObject SYNOPSIS
cc [ flag... ] file... -llayout [ library... ] #include <sys/layout.h> int m_getvalues_layout(const LayoutObject layout_object, LayoutValues values, int *index_returned); DESCRIPTION
The m_getvalues_layout() function queries the current setting of layout values within a LayoutObject. The layout_object argument specifies a LayoutObject returned by the m_create_layout(3LAYOUT) function. The values argument specifies the list of layout values that are to be queried. Each value element of a LayoutValueRec must point to a location where the layout value is stored. That is, if the layout value is of type T, the argument must be of type T*. The values are queried from the LayoutObject and represent its current state. It is the user's responsibility to manage the space allocation for the layout values queried. If the layout value name has QueryValueSize OR-ed to it, instead of the value of the layout value, only its size is returned. The caller can use this option to determine the amount of memory needed to be allocated for the layout values queried. RETURN VALUES
Upon successful completion, the m_getvalues_layout() function returns 0. If any value cannot be queried, the index of the value causing the error is returned in index_returned, -1 is returned and errno is set to indicate the error. ERRORS
The m_getvalues_layout() function may fail if: EINVAL The layout value specified by index_returned is unknown, its value is invalid, or the layout_object argument is invalid. In the case of an invalid layout_object argument, the value returned in index_returned is -1. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
m_create_layout(3LAYOUT), attributes(5) SunOS 5.10 8 Jun 1999 m_getvalues_layout(3LAYOUT)