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A comment on A Programmer-Friendly I/O Abstraction Over io_uring and kqueue. Parent comment

Re:A Programmer-Friendly I/O Abstraction Over io_uring and k... by yarosv on Thursday November 27, 2025 @08:26PM (#46074754)
from open(2):

    Note that this flag has no effect for regular files and block devices; that is, I/O operations will (briefly) block when device activity is required, regardless  of  whether O_NONBLOCK  is  set.  Since O_NONBLOCK semantics might eventually be implemented, applications should not depend upon blocking behavior when specifying this flag for regular files and block devices.
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