Messages in this thread |  | | Subject | Re: Async IO | Date | Wed, 05 Feb 1997 11:06:26 PST | From | Tim Wright <> |
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In message <Pine.HPP.3.91.970205102211.9281A-100000@ruprecht.prz.tu-berlin.de>, Michael Eyrich writes: > > Negativ signal values are used to reach a process with all its childs > i.e. a process group. Positiv signal values are used to reach exactly > one process and the 0-signal is used to check if there is a process with > this number ..
No, negative *pids* are used to signal a process group. (pid_t) -1 signals all processes whose real uid matches the effective uid of the sender. I'm not sure what Posix has to say about the valid range of signals, but I suspect it is probably limited.
t
-- Tim Wright, Worldwide Technical Services, | Email: timw@sequent.com Sequent Computer Systems Inc., 15450, | SW Koll Parkway, Beaverton, Oregon 97006 | Phone: +1-503-578-3822 "Applying computer technology is simply finding the right wrench to pound in the correct screw"
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