On Sat, Mar 31, 2012 at 09:16:20PM -0400, Chet Ramey wrote: > On 3/31/12 9:19 AM, Lluís Batlle i Rossell wrote: > > Hello, > > > > I have this script, that I've found to never write "DONE" in my systems, > > with > > bash 4.0, 4.1, 4.2.. until 4.2-p20, my last test. > > > > However, in irc some people told me it prints DONE for them. If I run the > > script with > > bash under 'strace -f', it also prints DONE. > > It looks like a simple race condition. I suspect that the scheduler > arranges things so that the child process ends up exiting between the > open and the read, but I don't have any real evidence to back it up. > (Like you, my Mac OS X system prints `DONE'.) > > You might want to try using exec to open the FIFO in the parent process > rather than trying to open it on each read.
Yes, I know I can work around it, but I meant that the race of the parent getting SIGCHLD in the read call did not bring any useful outcome. For me, useful outcomes could be: - read nothing, and unblock with error - keep on reading the same fd But it does not do any of those. Thank you, Lluís.
