noreentrant functions on Linux Advance Server 2.1 using gcc 2.96

[Jyotirmoy Das]

Hi All, 
  How can I get the list of thread unsafe functions on Linux Advance
Server 2.1 using gcc 2.96? And also how to get their corresponding
thread safe version? 
How I know that I particular function is reentrant or not?

Thanks,
Jyotirmoy