On 2016-07-28 22:48:54 +0200, Francesco Poli wrote: > This was somewhat intended: hitting [Ctrl-C] was supposed to interrupt > the bug report retrieval, while giving the user a chance to decide what > to do (retry and/or aborting and/or going on with the > installation/upgrade)...
So, apt-listbugs traps SIGINT. > > but apt-listbugs is still running and attached to the terminal: > > > > UID PID PPID C STIME TTY TIME CMD > > root 702 701 1 12:36 pts/6 00:00:00 /usr/bin/ruby > > /usr/sbin/apt-listbugs apt > > ... this is instead unexpected! > I managed to reproduce the misbehavior, but I have no idea why it > happens. :-( > > The shell prompt should not reappear, while apt-listbugs is still > running! Perhaps a problem on how SIGINT is handled, similar to what is described here if /bin/sh is involved somewhere: https://www.cons.org/cracauer/sigint.html I suspect that some process (aptitude or a descendant) runs apt-listbugs with system(), which is based on /bin/sh, thus dash in most cases. So, it could be a consequence of this bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=683671 (note: the particular problem with Emacs has been "fixed" in Emacs, i.e. Emacs no longer uses SIGINT for Ctrl-G or something like that, but the problem related to SIGINT is still present in dash.) > > Now, if I type Return, it is grabbed by apt-listbugs though I have > > my shell prompt, and I get an additional error message: > > > > root@zira:/home/vinc17# aptitude > > Interruptedactions... > > Faileving bug reports... 0%^C > > Error retrieving bug reports from the server with the following error > > message: > > E: exit > > It could be because your network is down, or because of broken proxy > > servers, or the BTS server itself is down. Check network configuration and > > try again > > Retry downloading bug information? [Y/n] > > root@zira:/home/vinc17# E: Input/output error @ io_fillbuf - fd:0 <STDIN> > > This is even more awkward: I tried to understand where this error is > coming from, but I haven't yet succeeded. Both the interactive shell and apt-listbugs are attached to the terminal and try to read from it. So, awkward things can occur. -- Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
