Hello again, sorry it took me so long to reply, I got flooded by other work.
This is an example from machines running Solaris 11: First I open xterm window. localhost> ssh root@somemachine somemachine> bash # run this a few times to create tree deep enough somemachine> bash somemachine> bash somemachine> bash somemachine> bash somemachine> bash somemachine> bash somemachine> bash somemachine> bash somemachine> bash somemachine> touch /tmp/this_shouldnt_be_here #don't send this command Now I just close xterm window, and when I ssh back to somemachine somemachine> ls /tmp | grep shouldnt -rw-r--r-- 1 root root 0 Dec 18 16:05 this_shouldnt_be_here And here is how /root/.bash_history looks like: somemachine> tail -12 /root/.bash_history bash bash bash bash bash bash bash bash bash bash bash touch /tmp/this_shouldnt_be_here I checked what's going on using truss, and here's what is says (just the interesting part): 1197: read(0, " r", 1) = 1 1197: lwp_sigmask(SIG_SETMASK, 0x00000002, 0x00000000, 0x00000000, 0x00000000) = 0xFFBFFEFF [0xFFFFFFFF] 1197: write(2, " r", 1) = 1 1197: lwp_sigmask(SIG_SETMASK, 0x00000000, 0x00000000, 0x00000000, 0x00000000) = 0xFFBFFEFF [0xFFFFFFFF] 1197: read(0, " e", 1) = 1 1197: lwp_sigmask(SIG_SETMASK, 0x00000002, 0x00000000, 0x00000000, 0x00000000) = 0xFFBFFEFF [0xFFFFFFFF] 1197: write(2, " e", 1) = 1 1197: lwp_sigmask(SIG_SETMASK, 0x00000000, 0x00000000, 0x00000000, 0x00000000) = 0xFFBFFEFF [0xFFFFFFFF] 1197: read(0, 0xFFFF80D532B7FE8C, 1) (sleeping...) 1197: read(0, 0xFFFF80D532B7FE8C, 1) = 0 1197: write(2, "\n", 1) Err#5 EIO 1197: lwp_sigmask(SIG_SETMASK, 0x00000002, 0x00000000, 0x00000000, 0x00000000) = 0xFFBFFEFF [0xFFFFFFFF] 1197: ioctl(0, TCSETSW, 0x00537020) Err#6 ENXIO 1197: lwp_sigmask(SIG_SETMASK, 0x00000000, 0x00000000, 0x00000000, 0x00000000) = 0xFFBFFEFF [0xFFFFFFFF] 1197: sigaction(SIGINT, 0xFFFF80D532B7FE60, 0xFFFF80D532B7FEC0) = 0 1197: sigaction(SIGTERM, 0xFFFF80D532B7FE60, 0xFFFF80D532B7FEC0) = 0 1197: sigaction(SIGQUIT, 0xFFFF80D532B7FE60, 0xFFFF80D532B7FEC0) = 0 1197: sigaction(SIGALRM, 0xFFFF80D532B7FE60, 0xFFFF80D532B7FEC0) = 0 1197: sigaction(SIGTSTP, 0xFFFF80D532B7FE60, 0xFFFF80D532B7FEC0) = 0 1197: sigaction(SIGTTOU, 0xFFFF80D532B7FE60, 0xFFFF80D532B7FEC0) = 0 1197: sigaction(SIGTTIN, 0xFFFF80D532B7FE60, 0xFFFF80D532B7FEC0) = 0 1197: sigaction(SIGWINCH, 0xFFFF80D532B7FE60, 0xFFFF80D532B7FEC0) = 0 1197: sigaction(SIGINT, 0xFFFF80D532B7FE50, 0xFFFF80D532B7FED0) = 0 1197: brk(0x26CD05000) = 0x00000000 1197: fstatat(AT_FDCWD, ".", 0xFFFF80D532B80D40, 0) = 0 1197: fstatat(AT_FDCWD, "/usr/bin/touch", 0xFFFF80D532B80C60, 0) = 0 So you can see that touch command starts to be executed. 1197 is PID of bottom-most bash in tree. I was able to reproduce this in other OS than Solaris, but now I seem to be out of luck to do so when I need it to show. You can also notice that writing "\n" to 2 results in EIO, since stderr is dead, as tty get's killed first. If you need, I can even provide truss log for tty. ----- chet.ra...@case.edu wrote: > On 12/17/14, 3:23 PM, Greg Wooledge wrote: > > On Wed, Dec 17, 2014 at 03:16:53PM -0500, Steve Simmons wrote: > >> Advance apologies if I'm misunderstanding, but the described bug > looks like reasonable behavior to me. > > > > It would be more reasonable for bash (or ssh, I'm not sure at what > level > > this handling should occur) to discard the partially typed line. > Not > > to execute it. > > > > If I open an rxvt and type "touch this_file_should_not_exist" but do > not > > press Enter, and then I close the terminal using my window > manager's > > "Close" functionality, bash does not execute the partially-typed > command. > > (Verified by the absence of the file in a new window.) > > The timing was right: the shell received SIGHUP, it interrupted > read(2), > and the shell exited. This is how it happens in the vast majority of > cases. > > What the original complaint refers to is what to do in the infrequent > case when the terminal goes away, the kernel doesn't deliver a > SIGHUP, > and a read returns EOF instead of -1. Well, that's exactly the case that happens to me, and readline changes EOF to NEWLINE. > > Chet > > -- > ``The lyf so short, the craft so long to lerne.'' - Chaucer > ``Ars longa, vita brevis'' - Hippocrates > Chet Ramey, ITS, CWRU c...@case.edu > http://cnswww.cns.cwru.edu/~chet/ Jiri
