What do the suppressed leaks mean in Valgrind?

Question

I have developed a pure-C implementation of FIFO lists (queues) in files fifo.h and fifo.c, and have written a test programme testfifo.c which I compile to ./bin/testf

Answer 1

Those are leaks outside of your code, in (probably shared) libraries or known false positives. Running valgrind with -v should inform you about the suppressions used.