implement parse url
add timerfd function
implement _send and _recv
working on epoll. backup
working on dl_prepare
remove common.{c, h}
use -pthread instead of -lpthread
add todo function to task
redirect is finished
working on dl_start
add wrap.c
more wrap function
add MSG_DONTWAIT flag
work on save data
fix bug in dl_start
add signal handler
work on save_data
fix timer bug
fix bug on read log
fix bug on progress bar