Anyway, the kernel can't rely on userspace using O_CLOEXEC. If the flush
callback being called from multiple processes is an issue, maybe the
flush callback isn't appropriate after all.
Userspace could also grab a reference just by opening /proc/$pid/fd/*.
The idea is just that when any process which used the fd is killed by a
signal we drop the remaining jobs from being submitted to the hardware.
Christian.
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