thanks, so i guess if i use unidirectional connection, and the reader does not expect to get an EOF() thank i'm safe.
thanks, erez. On Tue, Jun 4, 2013 at 3:23 PM, Amos Shapira <[email protected]> wrote: > On 4 June 2013 21:43, ronys <[email protected]> wrote: > >> Nothing. You're just wasting resources (file descriptors) and making your >> code a bit harder to understand and maintain. >> >> Note that for pipe(), you can use both fds at both ends of the pipe, but >> it's very easy to get into a race condition.Better to open a pair of pipes, >> one for each direction (of course, you now need to worry about >> deadlocks...). >> > > And about this one (race conditions) - any two processes using pipes > (which have limited buffer size) to talk to each other bi-directionally run > the risk of a deadlock if not coded carefully since they can easily reach a > point where both of them block on write(2) which will only unblock when the > other side read(2)'s and frees up space in the buffer (but the other side > is blocked on a write - that's why it's called a "deadlock"). Typical ways > to avoid that are to create threads to watch the fd's or use none-blocking > IO. > > >> >> Rony >> >> >> On Tue, Jun 4, 2013 at 2:24 PM, Erez D <[email protected]> wrote: >> >>> hello >>> >>> using the usual pipe()+fork()+dup()+close() to fork a child process and >>> pipe data from and to it, >>> >>> I know both the child and parent must close the unused fds. >>> >>> why ? >>> what if i don't close the unsed fds ? >>> >>> >>> thanks, >>> erez. >>> >>> >>> _______________________________________________ >>> Linux-il mailing list >>> [email protected] >>> http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il >>> >>> >> >> >> -- >> Ubi dubium, ibi libertas (where there is doubt, there is freedom) >> >> _______________________________________________ >> Linux-il mailing list >> [email protected] >> http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il >> >> > > > -- > [image: View my profile on LinkedIn] > <http://www.linkedin.com/in/gliderflyer> >
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