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function name from function pointer

hi,
is it possible to get function name from function pointer. I am using
gcc compiler
on linux.

thanks
Nov 11 '08 #1
12 17276
sinbad wrote:
hi,
is it possible to get function name from function pointer. I am using
gcc compiler
on linux.
Yes, but not in standard C. Try a Linux group, or comp.unix.progr ammer.

--
Ian Collins
Nov 11 '08 #2
On 11 Nov 2008 at 6:15, sinbad wrote:
is it possible to get function name from function pointer. I am using
gcc compiler on linux.
Yes: man dladdr. You'll probably need to give gcc the -rdynamic flag to
get the linker to export a full symbol table.

Nov 11 '08 #3
On Nov 11, 3:46*pm, Antoninus Twink <nos...@nospam. invalidwrote:
On 11 Nov 2008 at *6:15, sinbad wrote:
is it possible to get function name from function pointer. I am using
gcc compiler on linux.

Yes: man dladdr. You'll probably need to give gcc the -rdynamic flag to
get the linker to export a full symbol table.
Hi,
You can print the function pointers address using %pf and then look
up for the same in the object table given by nm.
HTH,

Deepak.P
Nov 11 '08 #4
Ian Collins wrote, On 11/11/08 06:23:
sinbad wrote:
>hi,
is it possible to get function name from function pointer. I am using
gcc compiler
on linux.
Yes, but not in standard C.
That should be sometimes.
Try a Linux group, or comp.unix.progr ammer.
Indeed.
--
Flash Gordon
If spamming me sent it to sm**@spam.cause way.com
If emailing me use my reply-to address
See the comp.lang.c Wiki hosted by me at http://clc-wiki.net/
Nov 11 '08 #5
Peerless wrote, On 11/11/08 18:28:
On Nov 11, 3:46 pm, Antoninus Twink <nos...@nospam. invalidwrote:
>On 11 Nov 2008 at 6:15, sinbad wrote:
>>is it possible to get function name from function pointer. I am using
gcc compiler on linux.
Yes: man dladdr. You'll probably need to give gcc the -rdynamic flag to
get the linker to export a full symbol table.

Hi,
You can print the function pointers address using %pf and then look
up for the same in the object table given by nm.
Except when the name is not there. Ask in a Linux or Unix group for why
it might not be there on a Linux or Unix like system.
--
Flash Gordon
If spamming me sent it to sm**@spam.cause way.com
If emailing me use my reply-to address
See the comp.lang.c Wiki hosted by me at http://clc-wiki.net/
Nov 11 '08 #6
Peerless wrote:
On Nov 11, 3:46 pm, Antoninus Twink <nos...@nospam. invalidwrote:
>On 11 Nov 2008 at 6:15, sinbad wrote:
>>is it possible to get function name from function pointer. I am using
gcc compiler on linux.
Yes: man dladdr. You'll probably need to give gcc the -rdynamic flag to
get the linker to export a full symbol table.

Hi,
You can print the function pointers address using %pf and then look
up for the same in the object table given by nm.
"%pf"? Is this like the "%du" from a few days ago?

As far as I know, there is no printf() conversion specifier
for function pointers. If there were one, it could not be "%pf",
nor "%fp" for that matter.

--
Er*********@sun .com
Nov 11 '08 #7
sinbad wrote:
>
is it possible to get function name from function pointer. ...
No.

--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.
Nov 11 '08 #8
>is it possible to get function name from function pointer. I am using
>gcc compiler
on linux.
Two words: lookup table. Make a table of function names and their
addresses. Find a function pointer that matches the one you are
looking for, then use the corresponding name. It's very portable.
It also requires you to have a list of functions that are of interest
to make the table.

There are some system-specific ways to access symbols in an executable.
This is problematic because (1) there is no guaranteed way to find
the path of the running executable (some versions of Linux provide
a way to open it anyway), and (2) the executable, especially if
static-linked, might not *HAVE* any symbols. If it's code you are
compiling, you can usually arrange to keep the symbols.
Nov 12 '08 #9
On Tue, 11 Nov 2008 19:23:06 +1300, Ian Collins <ia******@hotma il.com>
wrote in comp.lang.c:
sinbad wrote:
hi,
is it possible to get function name from function pointer. I am using
gcc compiler
on linux.
Yes, but not in standard C. Try a Linux group, or comp.unix.progr ammer.
Well, not prior to C99. Since then, there's:

"6.4.2.2 Predefined identifiers

Semantics

1 The identifier _ _func_ _ shall be implicitly declared by the
translator as if, immediately following the opening brace of each
function definition, the declaration
static const char _ _func_ _[] = "function-name";
appeared, where function-name is the name of the lexically-enclosing
function.

2 This name is encoded as if the implicit declaration had been written
in the source character set and then translated into the execution
character set as indicated in translation phase 5."

Of course C99 implementations are pretty rare.

--
Jack Klein
Home: http://JK-Technology.Com
FAQs for
comp.lang.c http://c-faq.com/
comp.lang.c++ http://www.parashift.com/c++-faq-lite/
alt.comp.lang.l earn.c-c++
http://www.club.cc.cmu.edu/~ajo/docs/FAQ-acllc.html
Nov 12 '08 #10

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