[TUHS] Another odd comment in V6

Tony Finch dot at dotat.at
Wed Feb 22 19:59:49 AEST 2017

Norman Wilson <norman at oclsc.org> wrote:
> Sometime in the latter days of the Research system (somewhere
> between when the 9/e and 10/e manuals were published), I had
> an inspiration about that, and changed things as follows:
> When a system call like read is interrupted by a signal:
> -- If no characters have been copied into the user's
> buffer yet, return -1 and set errno to EINTR (as would
> always have been done in Heritage UNIX).
> -- If some data has already been copied out, return the
> number of characters copied.

Weird, I thought what you describe was the traditional behaviour, e.g.


both say you only get EINTR if nothing was read. (This detail seems to go
back to the 4.1c manual.) Was this a BSDism?

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