cat appropriate in-band non-cannonical text symbol to i/o of process. (aka. end of file, sighup, suspend, segfalt, etc) via shell, LD_ friends, gdb, etc redir

cat appropriate in-band non-cannonical text symbol to i/o of process. (aka. end of file, sighup, suspend, segfalt, etc) via shell, LD_ friends, gdb, etc redirect process i/o to /dev/null. send out of memory or other non-recoverable systems error to process