I was trying to replace system() API in my multi-threaded app as it is suggested not to any calls in multi-threaded app which uses fork()..... When I was going through the man pages of fork()..in the Notes section I found * "Since version 2.3.3, rather than invoking the kernel's fork() system call, the glibc fork() wrapper that is provided as part of the NPTL threading implemenâ* * tation invokes clone(2) with flags that provide the same effect as the traditional system call. The glibc wrapper invokes any fork handlers that have been* * established using pthread_atfork(3)."* Is this mean, I still can use fork() or any other API which uses fork() for its implementation and make sure my app is thread safe or free from dead locks???? Thanks, Praveen R