bash-4.2$ ls -la
total 31
drwxr-xr-x   2 root root    72 Aug 13 13:27 ./
drwxr-xr-x 278 root root 27232 Aug 13 13:27 ../
-rw-r--r--   1 root root   316 Aug 13 12:58 fork.c

bash-4.2$ tcc -run fork.c 
Hello fork()
I'm the dad 
I'm the child process 

bash-4.2$ ls -la
total 31
drwxr-xr-x   2 root root    72 Aug 13 13:27 ./
drwxr-xr-x 278 root root 27232 Aug 13 13:27 ../
-rw-r--r--   1 root root   316 Aug 13 12:58 fork.c