about libc function interfaces and ld --wrap

[sean yang]

Several question to ask about libc and linker:

(1) I would ask general glibc design question: whether an exported function 
in glibc can be called by another function internally?
For example (--which is a faked example),
malloc is an exported function;
foo(this is a faked name example)  is another exported function;
** is it possible that foo( ) calls malloc( )  internally?

(2) If the answer to above question is yes, then the following that question 
is: if I have printf wrapped by my own layer (by "ld --wrap printf"), will 
_wrap_malloc() change the internal call's behavior?

void *
__wrap_ malloc(int c)
{
  printf ("Coming here\n", c);
  return __real_malloc (c);
}

(3) If there a convenient way to wrap multi function, e.g., malloc, printf, 
getc...., with same "added functionality" (say just print "coming here"). I 
mean an better way than create each wrapper seperately?

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