[TUHS] EOF on pipes?
dave at horsfall.org
Tue Feb 27 15:48:38 AEST 2018
On Tue, 27 Feb 2018, Rudi Blom wrote:
> By using pipe() you create a FIFO pipe with certain limitations
> (including 5120 write limit). When you open the streams device twice and
> ioctl() two file descriptors together you have more flexibility.
There's always been a limit on the write until the reader got around to
it; that's why you had to take care to avoid deadlocks.
Heck, I fell into a deadlock the other day with Perl; I thought that "say
<$reader_pipe>" (to echo whatever was read) as a neat shortcut would
work... It deadlocked, because "<>" was evaluated in list context
(because of "say") and hence waited for the EOF that would never arrive so
that I could close the writer end.
Dave Horsfall DTM (VK2KFU) "Those who don't understand security will suffer."
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