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authorJulian Andres Klode <julian.klode@canonical.com>2018-06-13 18:45:12 +0200
committerJulian Andres Klode <julian.klode@canonical.com>2018-06-13 23:36:08 +0200
commit79f012bd09ae99d4c9d63dc0ac960376b5338b32 (patch)
tree7e808578aac6fe6655c29ac871d6d25108c7534b /CMakeLists.txt
parent15df82d2c8a29ac179ddcd57eb849d3ad0f2561f (diff)
Fix lock counting in debSystem
debSystem uses a reference counted lock, so you can acquire it multiple times in your applications, possibly nested. Nesting locks causes a fd leak, though, as we only increment the lock count when we already have locked twice, rather than once, and hence when we call lock the second time, instead of increasing the lock count, we open another lock fd. This fixes the code to check if we have locked at all (> 0). There is no practical problem here aside from the fd leak, as closing the new fd releases the lock on the old one due to the weird semantics of fcntl locks.
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