Slog

Slog is a recreation of strace the linux utility for tracing signals and syscalls.

Features

Slog implements a couple of features of strace, mainly the usage without options where it will list all system calls called and all signals received by the tracee.

There is also the option to run Slog with the -c flag which will give a summary at the end similar to the one given by strace.

Using

Using Slog to trace for example ls is relatively simple:

./slog ls

and will give you a similar result to:

execve(0x5621aab191a0, 0x7ffd575f2c50, 0x7ffd575f2c60) = 0
brk(0) = 94824348532736
mmap(0, 8192, 3, 140711493732402, 4294967295, 0) = 140711493591040
access(0x7ff9f29a1340, 4) = -2
openat(-100, 0x7ff9f29a020c, 524288, -224819542) = 3
...
write(1, 0x563e039c4500, 42Makefile  obj  README.md  slog	src  tools
) = 42
close(1) = 0
close(2) = 0
exit_group(0) = ?
+++ exited with 0 +++

if instead you want a summary you simply run:

./slog -c ls

Building

To build Slog you just run make:

git clone https://github.com/Chimplement/slog.git slog
cd slog
make

Why

I made Slog as an exercise for school, to learn about ptrace and strace. This is also the reason for a couple of odd choices in ptrace requests, like using PTRACE_SEIZE and PTRACE_INTERRUPT instead of PTRACE_ATTACH or PTRACE_TRACEME, as the subject had restricted those.