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On Android signal handlers are setup by the linker (through debuggerd_client):
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https://github.com/android/platform_system_core/blob/6fff551728f75e35b69bd59f2bc722a72d5c6d61/debuggerd/client/debuggerd_client.cpp#L290
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diff -u -r ../gdb-7.12/gdb/common/signals-state-save-restore.c ./gdb/common/signals-state-save-restore.c
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--- ../gdb-7.12/gdb/common/signals-state-save-restore.c 2016-10-07 13:04:17.000000000 -0400
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+++ ./gdb/common/signals-state-save-restore.c 2016-10-09 18:39:27.866619885 -0400
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@@ -58,10 +58,12 @@
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else if (res == -1)
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perror_with_name (("sigaction"));
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+#ifndef __ANDROID__
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/* If we find a custom signal handler already installed, then
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this function was called too late. */
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if (oldact->sa_handler != SIG_DFL && oldact->sa_handler != SIG_IGN)
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internal_error (__FILE__, __LINE__, _("unexpected signal handler"));
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+#endif
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}
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#endif
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}
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