> Från: Christof Warlich <[email protected]> > Till: Harald Becker <[email protected]> > Kopia: [email protected] > Skickat: söndag, 22 januari 2012 20:42 > Ämne: Re: how to test if a pipe contains data > > Am 22.01.2012 17:14, schrieb Harald Becker: >> ... another one doing busy waiting in Unix shell scripts. > > Why do you conclude that I'm busy-waiting? I'm well aware and use Unix > concepts like select() and threads wherever appropriate, but sometimes, even > the > most brilliant concept does not fit anyones needs. > > Anyhow, if it helps, or even if someone is interested, I'm happy to explain > in detail why I need to peek for data on a filedescriptor. Otherwise, I'm > hoping for help w.r.t. my question, being even fine with a statement from an > experienced BusyBox expert that BusyBox cannot do what I'd like to do, as I > could easily write an appropriate helper in C that does what I need. I just > thought I might ask here first in case that I've overlooked something. > > Again, thanks a lot to anyone willing to help,
Without questioning you motives there is a dirty line that you may use if you are willing to wait 1 sec for the result: ash -c "busybox timeout -t 1 ash -c 'read -n0'" &> /dev/null returns 0 on success and 143 on failure/timeout. However, it IS hackish and I would recommend looking into the C-wrapper solution as Laurent suggested. /Sven _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
