i've been using a trick with flock to add locking to all of my shell scripts. basically, i take a lock on the shell script itself: flock -eon ./test.sh ./test.sh with <=util-linux-2.20, this has worked fine. but starting with 2.20.1, i now get -ETXTBSY (on ext4, but i doubt that matters): $ echo '#!/bin/sh' > test.sh $ chmod a+rx test.sh $ ./flock -eon ./test.sh ./test.sh ./flock: ./test.sh: Text file busy the only commit made to flock.c between 2.20 and 2.20.1 is this: commit 75aaee08f06b92d119ed827c53d1af5474eb16ff flock: make flock(1) work on NFSv4 and indeed, reverting that made my life happy again. reading the small patch shows the obvious flaw: you can't open a file for O_RDWR and attempt to execute it at the same time. -mike
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