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