function name from function pointer

[sinbad]

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

thanks

[Ian Collins]

Jack Klein wrote:

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.

So how would that help get a function name from a function pointer?

--
Ian Collins

[James Kuyper]

Jack Klein wrote:

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.

Notice that __func__ behaves as if it were declared "immediatel y
following the opening brace", and therefore has block scope. It has to
have block scope, because if it had file scope its definition would
conflict with the definition of __func__ in all of the other functions
of the program. Therefore, the only __func__ that can be referred to
directly by any given function is that function's own __func__. How are
you suggesting that this feature be used to determine the name of some
other function, using only a pointer to that other function?

[Nate Eldredge]

Jack Klein <ja*******@spam cop.netwrites:

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.

The __func__ feature, however, is not so rare, in my experience. But
how does it help you get the function name given a *function pointer*?