Re: SIGPIPE echoing to fifo exits zsh

[Han Pingtian <hanpt@xxxxxxxxxxxxxxxxxx>]

Looks like the crash occurs at this line in bin_print():

    4084         /* Testing EBADF special-cases >&- redirections */
    4085         if ((fout != stdout) ? (fclose(fout) != 0) :
    4086             (fflush(fout) != 0 && errno != EBADF)) {

On Tue, Jan 15, 2013 at 04:43:31PM +0100, Christian Neukirchen wrote:
> Hi,
> 
> I noticed this thing:
> 
> shell1% mkfifo /tmp/fifo
> shell1% while :; do head -1 /tmp/fifo; done
> 
> shell2% gdb zsh
> (gdb) r -f
> juno% repeat 1000 echo a >/tmp/fifo
> 
> Program received signal SIGPIPE, Broken pipe.
> 0x00007ffff71a7100 in __write_nocancel () from /usr/lib/libc.so.6
> (gdb) bt
> #0  0x00007ffff71a7100 in __write_nocancel () from /usr/lib/libc.so.6
> #1  0x00007ffff71410d3 in _IO_new_file_write () from /usr/lib/libc.so.6
> #2  0x00007ffff7140fb2 in new_do_write () from /usr/lib/libc.so.6
> #3  0x00007ffff71422c5 in __GI__IO_do_write () from /usr/lib/libc.so.6
> #4  0x00007ffff7141680 in __GI__IO_file_sync () from /usr/lib/libc.so.6
> #5  0x00007ffff713654b in fflush () from /usr/lib/libc.so.6
> #6  0x000000000041a2dd in bin_print ()
> #7  0x000000000041d117 in execbuiltin ()
> #8  0x000000000042b2d1 in ?? ()
> #9  0x000000000042b866 in ?? ()
> #10 0x000000000042bdaf in ?? ()
> #11 0x000000000042cf5f in execlist ()
> #12 0x000000000044c354 in execfor ()
> #13 0x000000000042a73b in ?? ()
> #14 0x000000000042b866 in ?? ()
> #15 0x000000000042bdaf in ?? ()
> #16 0x000000000042cf5f in execlist ()
> #17 0x000000000042d47d in execode ()
> #18 0x000000000043d972 in loop ()
> #19 0x0000000000440b1e in zsh_main ()
> #20 0x00007ffff70eca15 in __libc_start_main () from /usr/lib/libc.so.6
> #21 0x000000000040f3d1 in _start ()
> 
> Using /bin/echo (coreutils 8.20), the code works flawlessy (all lines
> get through the FIFO).
> 
> Thanks,
> -- 
> Christian Neukirchen  <chneukirchen@xxxxxxxxx>  http://chneukirchen.org