(signal_exit): Move to sigproc.cc. * sigproc.cc (signal_exit): Move here. Declare stackdump extern. Set my_sendsig to indicate that signals are no longer available. (my_readsig): Make Static again. (sig_send): Interpret ERROR_BROKEN_PIPE as ESRCH. Remove special-case EACCESS errno setting, just setting errno generally, even for "its_me" case.
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