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[Bug gdb/18945] gdbserver cannot be interrupted on linux when pgid doesn't match pid


https://sourceware.org/bugzilla/show_bug.cgi?id=18945

--- Comment #2 from Josh Gao <jmgao at google dot com> ---
If the attached process is in some other process group, then a signal sent to
-pid doesn't get sent to anyone (e.g.: http://ideone.com/fnz3oK )

(Some additional context: all applications in android share the process group
of the zygote which it's forked off of, of which there only 1 or 2, depending
on architecture (32-bit only vs 32 + 64))

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