i was pointed at a bug report for FreeBSD systems [1] where running lots of processes in parallel would randomly fail with errors like: cannot make pipe for process substitution: File exists
upstream FreeBSD addressed this by defining USE_MKTEMP [2] & USE_MKSTEMP [3] when building bash. looking at the source in bash though, i can't see why these aren't always defined. why does bash try to reimplement both funcs ad-hoc instead of just using the stable/guaranteed system versions ? the bash versions seem like it's pretty trivial to collide: it mixes current seconds count, current pid number, and a counter. when you factor in modern tech like linux pid namespaces, it's trivial to get a situation where the pid/time are the same values. -mike [1] https://bugs.gentoo.org/574426 [2] https://svnweb.freebsd.org/ports?view=revision&revision=391614 [3] https://svnweb.freebsd.org/ports?view=revision&revision=391692
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