chys87/slower

Run a program with the clock running slowly

slower

This utility helps you run a program on Linux with the clock running more slowly or quickly than usual.

Usage

Build:

cd slower
make

You should get file libslower.so.

Run a program (take DOSBox as the example):

SLOWER_FACTOR=2 LD_PRELOAD=/path/to/libslower.so dosbox

Then have fun. You can adjust the value of SLOWER_FACTOR to achieve different ratios. Values between 0.01 and 100 (inclusive) are accepted. The larger the value, the slower the clock (as seen by the deceived application) runs.

You can also make install and use slower.sh instead:

/path/to/slower.sh -f 2 dosbox

HOW IT WORKS & TODO

This program hacks glibc time functions to deceive applications of the real time.

Currently hacked interfaces:

• clock_gettime
• time
• gettimeofday

TODO:

• Sleep functions: sleep, usleep, nanosleep, clock_nanosleep
• File descriptor polling functions: select, pselect, poll, ppoll, epoll_wait, epoll_pwait
• Timer functions: TBA
• Timeout related: TBA
• syscall
• Others?