hello everyone..
int fun()
{
/* anything */
}
int main(void)
{
fun();
}
in this program, when the control is transferred to function fun()..
the return address is pushed to the stack..
Is it possible to access this value..??
Aug 3 '08
62  2880 
Harold Aptroot wrote:
"MisterE" <Mi*****@nimga. comwrote in message
>>Is it possible to access this value..??
No.
Of course it is. The OP did not request a standard compliant
way to do it after all
On this newsgroup, there are no non-standard compliant ways to do
anything. Anything of that nature is off=topic, and may be found
on specialized news-groups dealing with the authors system.
--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.
On Mon, 04 Aug 2008 17:42:31 -0400, CBFalconer wrote:
Harold Aptroot wrote:
>"MisterE" <Mi*****@nimga. comwrote in message
>>>Is it possible to access this value..??
No.
Of course it is. The OP did not request a standard compliant way to do
it after all
On this newsgroup, there are no non-standard compliant ways to do
anything. Anything of that nature is off=topic,
Please don't use topicality as an excuse or defence for lies. I don't know
if MisterE is aware of the existence of any non-portable methods of
accessing a function call's return address, but you are.
CBFalconer <cb********@yah oo.comwrites:
Harold Aptroot wrote:
>"MisterE" <Mi*****@nimga. comwrote in message
>>>Is it possible to access this value..??
No.
Of course it is. The OP did not request a standard compliant
way to do it after all
On this newsgroup, there are no non-standard compliant ways to do
anything. Anything of that nature is off=topic, and may be found
on specialized news-groups dealing with the authors system.
Dont be such a prissy twit. If people want help in a C related area and
it happens that someone here can help it would be ludicrous not to.
CBFalconer <cb********@yah oo.comwrites:
Harold Aptroot wrote:
>"MisterE" <Mi*****@nimga. comwrote in message
>>>Is it possible to access this value..??
No.
Of course it is. The OP did not request a standard compliant
way to do it after all
On this newsgroup, there are no non-standard compliant ways to do
anything. Anything of that nature is off=topic, and may be found
on specialized news-groups dealing with the authors system.
The question was "Is it possible to access this value..??" (namely the
return address for a function). Either "Yes, but it's
system-specific", or "There's no portable way to do it" would be a
correct answer (though the latter is incomplete).
An unqualified "No." is not a correct answer.
People who post off-topic questions should not be punished by being
fed false information. And for that matter, the question itself
wasn't off-topic, though a detailed answer without a redirection would
have been.
--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"
In article <ln************ @nuthaus.mib.or g>,
Keith Thompson <ks***@mib.orgw rote:
>The question was "Is it possible to access this value..??" (namely the
return address for a function). Either "Yes, but it's
system-specific", or "There's no portable way to do it" would be a
correct answer (though the latter is incomplete).
"Yes, but it's system-specific" is incorrect. On some systems
there is no mechanism to get at the return address.
"There's no portable way to do it" is correct, as it includes
the case of there being no way to do it on some systems.
--
"You may comand nature to the extent only in which you are willing to
obey her." -- Walter Russell
Keith Thompson wrote:
CBFalconer <cb********@yah oo.comwrites:
.... snip ...
>
>On this newsgroup, there are no non-standard compliant ways to do
anything. Anything of that nature is off=topic, and may be found
on specialized news-groups dealing with the authors system.
.... snip ...
>
People who post off-topic questions should not be punished by
being fed false information. And for that matter, the question
itself wasn't off-topic, though a detailed answer without a
redirection would have been.
I don't think I did 'punish'. I told him where to go, in general
terms. He didn't specify his system.
--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.
On 4 Aug, 23:25, Harald van D©¦k <true...@gmail. comwrote:
On Mon, 04 Aug 2008 17:42:31 -0400, CBFalconer wrote:
Harold Aptroot wrote:
"MisterE" <Mist...@nimga. comwrote in message
>>Is it possible to access [the return address] value..??
>No.
Of course it is. The OP did not request a standard compliant way to do
it after all
On this newsgroup, there are no non-standard compliant ways to do
anything. Anything of that nature is off=topic,
Please don't use topicality as an excuse or defence for lies.
its not a lie. It's a fact. Your statement is incorrect. There
*is* no standard way to do this and since the topic of this NG
is standard C there is no way to do it that is topical to this
NG. Though I must admit I'd have suggested trying another NG.
I don't know
if MisterE is aware of the existence of any non-portable methods of
accessing a function call's return address, but you are.
--
Nick Keighley
"computers are no longer intended for those who can
understand mathematics, but only for those who cannot."
Herman Rubin (comp.lang.c)
On 4 Aug, 22:30, CBFalconer <cbfalco...@yah oo.comwrote:
jt wrote:
int fun() {
/* anything */
}
int main(void) {
fun();
}
in this program, when the control is transferred to function fun()..
the return address is pushed to the stack..
Is it possible to access this value..??
In a machine that can execute the standard C language, there is no
need for a stack. This makes it hard to access a return address
(of unknown form) stored in a non-existant stack.
but the information must be stored *somewhere* otherwise
the implementation wouldn't be able to return from the function.
Admittedly the implementaion is under no obligation to make
it available to the user.
--
Nick Keighley
This is not the same as a proof of correctness,
but proofs of correctness can only be constructed by computer
scientists with fancy degrees, not by mere clever programmers.
Ben Pfaff
Nick Keighley wrote:
On 4 Aug, 22:30, CBFalconer <cbfalco...@yah oo.comwrote:
>jt wrote:
int fun() {
/* anything */
}
int main(void) {
fun();
}
in this program, when the control is transferred to function fun()..
the return address is pushed to the stack..
Is it possible to access this value..??
In a machine that can execute the standard C language, there is no
need for a stack. This makes it hard to access a return address
(of unknown form) stored in a non-existant stack.
but the information must be stored *somewhere* otherwise
the implementation wouldn't be able to return from the function.
Admittedly the implementaion is under no obligation to make
it available to the user.
In the program above, if the compiler chose to inline `fun`, the
"return address" would be "stored" by the implicit fall-through of
one instruction to the next [1].
As we have discussed before, not all C programs need an explicit
run-time stack data-structure. Of those that do, that structure
need not correspond to the local hardware's notion of "stack",
if it has one. Even if it does, the implementation is under no
requirement of the C standard to expose that stack to C programs.
And even if it /does/, mere ability should not elicit reckless
employment. One can, after all, clean one's teeth with a
screwdriver.
[1] On an implementation that uses "instructio ns", of course.
--
'It changed the future .. and it changed us.' /Babylon 5/
Hewlett-Packard Limited registered office: Cain Road, Bracknell,
registered no: 690597 England Berks RG12 1HN
Nick Keighley wrote:
On 4 Aug, 22:30, CBFalconer <cbfalco...@yah oo.comwrote:
>jt wrote:
int fun() {
/* anything */
}
int main(void) {
fun();
}
in this program, when the control is transferred to function
fun().. the return address is pushed to the stack..
Is it possible to access this value..??
In a machine that can execute the standard C language, there is no
need for a stack. This makes it hard to access a return address
(of unknown form) stored in a non-existant stack.
but the information must be stored *somewhere* otherwise
the implementation wouldn't be able to return from the function.
And it must also *behave* like a LIFO data structure. So at least a
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