10 Jul
2014
10 Jul
'14
10:52 a.m.
On Wed, Jul 09, 2014 at 10:49:22PM -0400, Doug McIlroy wrote:
It's easy for a process to insert a new process
into a
pipeline either upstream or downstream. Was there ever a
flavor of Unix in which a process could excise itself
from a pipeline without breaking the pipeline?
If in the middle of a pipeline, all I can think of is:
close fd 0 and fd 1
dup() read end of pipe 1 to be stdin (fd 0)
dup() write end of pipe 2 to be stdout (fd 1)
exec("/bin/cat")
Cheers, Warren