Cat using sendfile and splice
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altcat.c

README.md

altcat

An implementation of cat that uses splice and sendfile to write to stdout. In situations where stdout is piped, splice is used; in all other cases, sendfile is used. The combination of these calls avoids unnecessary copying to userspace.

One unfortunate side effect is that

altcat FILE >> OUT

is not supported as neither splice nor sendfile support appending to files.