strace

Hello everybody,
   I am a graduate student at the University of Nebraska , Lincoln.  I
would like to know the basic principle that strace uses to trace the
system calls .  

I need this info for my study of tracers available .

Thanks and regards,
Sarita Navuluru.

Hello there, 

  I am a graduate student at the University of Nebraska at Lincoln.  Can
someone tell me the basic principle that strace uses to capture system
calls ?

I need this info as I am doing a study on the various tracers available.

Its not what happens to people thats important but its what they do about
it.