Julia print backtrace on SIGPIPE by default

[yuyichao]

AFAIK most program either ignore SIGPIPE or silently quite on it...

yuyichao% LANG=C julia -f -e 'sleep(1); println()' | :

signal (13): Broken pipe
write at /usr/bin/../lib/libpthread.so.0 (unknown line)
unknown function (ip: 756400812)
uv_write2 at /usr/bin/../lib/julia/libjulia.so (unknown line)
jl_write_copy at /usr/bin/../lib/julia/libjulia.so (unknown line)
jl_putc_copy at /usr/bin/../lib/julia/libjulia.so (unknown line)
jl_pututf8_copy at /usr/bin/../lib/julia/libjulia.so (unknown line)
write at ./stream.jl:732
println at ./string.jl:5
jl_apply_generic at /usr/bin/../lib/julia/libjulia.so (unknown line)
println at ./string.jl:8
jl_apply_generic at /usr/bin/../lib/julia/libjulia.so (unknown line)
unknown function (ip: 756153688)
unknown function (ip: 756151199)
unknown function (ip: 756223645)
unknown function (ip: 756223783)
jl_toplevel_eval_in at /usr/bin/../lib/julia/libjulia.so (unknown line)
process_options at /usr/lib/julia/sys.so (unknown line)
_start at /usr/lib/julia/sys.so (unknown line)
jlcall__start_40944 at /usr/lib/julia/sys.so (unknown line)
jl_apply_generic at /usr/bin/../lib/julia/libjulia.so (unknown line)
unknown function (ip: 4200293)
unknown function (ip: 4199194)
__libc_start_main at /usr/bin/../lib/libc.so.6 (unknown line)
unknown function (ip: 4199269)
unknown function (ip: 0)

[yuyichao]

On Linux with git master...

[tkelman]

I'd rather not turn the backtrace off for this at this time - ref #9501, where we often were not getting backtraces on the Travis failures (possibly because they were running as parallel workers?).

[yuyichao]

Hmmm, that does look like a nasty bug...
However, IMHO, the correct way to do handle this is

1. Use the default handler on SIGPIPE by default
2. Set the backgrace handler in runtest
3. When running with multiple processes, detect in the exit state whether the process is killed with a signal.

[tkelman]

That sounds like a reasonable plan to me.

[yuyichao]

The current behavior is throwing a exception on SIGPIPE and IMHO it's one of the best ways to do it so I'll close this.