[bug #64442] xargs closes stdin on receiving SIGUSR1 or SIGUSR2

Follow-up Comment #7, bug #64442 (project findutils):

After testing further I found that SA_RESTART only fixes the case of waiting
on read.
I managed to trigger _xargs: error closing file_ by running this

c=1; while true; do printf '%s\n' "$c"; c=$((c+1)); done | xargs

and sending USR1 to xargs.


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