Try Strace on wget command

Its fun to try Strace on different commands to see what actually happens behind the command. There are some very good options to filter out required systems calls from the log.
The following link gives examples on how to use Strace http://www.thegeekstuff.com/2011/11/strace-examples/

one interesting system call is 'select' . I was only heard about 'select' in sql queries,but this is a different place i am seeing select :-)

"select() and pselect() allow a program to monitor multiple file descriptors, waiting until one or more of the file descriptors become "ready" for some class of I/O operation (e.g., input possible). A file descriptor is considered ready if it is possible to perform a corresponding I/O operation"

The sigaction() system call is used to change the action taken by a process on receipt of a specific signal.

 socket system call: