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List of resources related to LD_PRELOAD, a mechanism for changing application behavior at run-time
https://github.com/gaul/awesome-ld-preload

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ld-preload

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List of resources related to LD_PRELOAD, a mechanism for changing application behavior at run-time

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# Awesome LD\_PRELOAD



This is a list of resources related to LD\_PRELOAD, a mechanism for changing

application behavior at run-time.  Libraries can override specified functions

with another, for example, making `time(3)` always return 0.  This is often

useful for testing or modifying application behavior without source code

changes.



To use, set the environment variable

`LD_PRELOAD=/full/path/to/your_shared_lib.so` before launching your

application.



LD\_PRELOAD works on Linux systems and some BSDs.  macOS implements similar

functionality via DYLD\_INSERT\_LIBRARIES.



## Libraries



* [angrymlocker](https://github.com/stiletto/angrymlocker) - library for keeping corresponding process in memory

* [arg-inject](https://github.com/jktr/arg-inject) - add support for config files

* [cleancache](https://github.com/kahing/bin/blob/master/cleancache.c) - drop files content from page cache after closing, useful for backups

* [flockit](https://github.com/smerritt/flockit) - add file locking to programs that don't do it

* [fluxcapacitor](https://github.com/majek/fluxcapacitor) - a tool for making your program run without blocking on timeouts, on functions like poll and select

* [force-urandom](https://github.com/AGWA/force-urandom) - force programs to use fast and secure /dev/urandom instead of pointlessly slow /dev/random

* [fsatrace](https://github.com/jacereda/fsatrace) - filesystem access tracer

* [gamemode](https://github.com/FeralInteractive/gamemode) - enables optimizations for gaming that are automatically unset on process exit

* [ktlswrapper](https://github.com/zliuva/ktlswrapper) - enables TLS support for existing applications without code change

* [ld-preload-open](https://github.com/fritzw/ld-preload-open) - map files or directories to another location

* [libeatmydata](https://github.com/stewartsmith/libeatmydata) - disable all forms of writing data safely to disk. fsync() becomes a no-op, O\_SYNC is removed, etc.

* [libfaketime](https://github.com/wolfcw/libfaketime) - modifies the system time for a single application

* [libhugetlbfs](https://github.com/libhugetlbfs/libhugetlbfs) - remap segments onto huge pages for a performance boost

* [libinput-force-middle-click-emulation](https://github.com/gaul/libinput-force-middle-click-emulation) - force libinput to emulate a middle click when pressing left and right buttons simultaneously

* [libkeepalive](https://github.com/msantos/libkeepalive) - enable TCP keepalive socket options

* [libleakmydata](https://github.com/DavidBuchanan314/libleakmydata) - disable SSL certificate verification

* [libnoxattr](https://github.com/gaul/libnoxattr) - disable all forms of extended attribute access

* [lkl](https://github.com/lkl/linux#lkl-hijack-library) - use modern Linux kernel on old Centos5/6 (2.6 kernel) machines.

* [openssl-hook](https://github.com/sebcat/openssl-hook) - log data to/from SSL\_write/SSL\_read to disk

* [otherport](https://github.com/FiloSottile/otherport) - redirect connections to other ports

* [preeny](https://github.com/zardus/preeny) - redirect `stdin` and `stdout` to sockets; neuter `sleep`, report constant `time`, amongst others

* [srv-shim](https://github.com/disasters/srv-shim) - drop-in DNS SRV record support for applications relying on getaddrinfo/connect/sendto

* [stderred](https://github.com/sickill/stderred) - colorize all stderr output that goes to terminal thus making it distinguishable from stdout

* [timeskew](https://github.com/vi/timeskew) - override time reporting in Linux processes (accelerate/slowdown games, test code involving timers/delays)

* [trickle](https://github.com/mariusae/trickle) - a userland bandwidth shaper

* [unrandom](https://github.com/whitequark/unrandom) - make `srand()` always use the seed 0



## Meta



* [GitHub ld-preload tag](https://github.com/topics/ld-preload)

* [StackOverflow ld-preload tag](https://stackoverflow.com/questions/tagged/ld-preload)



## Links



* [LD\_PRELOAD is super fun. And easy!](https://jvns.ca/blog/2014/11/27/ld-preload-is-super-fun-and-easy/) (Julia Evans)

* [LD\_PRELOAD: The Hero We Need and Deserve](https://blog.jessfraz.com/post/ld_preload/) (Jessie Frazelle)



## License



Copyright (C) 2020 Google LLC



Licensed under the Creative Commons Attribution License, Version 4.0