How detect whether running under valgrind in make file or shell script?

Question

I need to detect whether my Makefile is running under valgrind (indirectly, using valgrind --trace-children=yes), I know how to do it from C but I have not found a way to do it from a script,

The earlier answers works on Linux only. For Mac OS X I am an going to grep for VALGRIND_STARTUP_PWD in the environment, unless someone has a better idea.

Answer 1

from a shell:

grep -q '/valgrind' /proc/$$/maps && echo "valgrindage"

This determines if the valgrind preloaded libraries are present in address map of the process. This is reasonably effective, but if you happen to have a non-valgrind related library that shares the '/valgrind' moniker then you will get a false positive (unlikely).

[I changed the grep pattern from vg_preload to /valgrind, as testing on Debian/Ubuntu revealed that the library name was different, while a directory match of valgrind is most likely to succeed.]