/usr/lib/avr/include/unistd.h is in avr-libc 1:2.0.0+Atmel3.6.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #define __need_size_t
#include <stddef.h>
#include <sys/types.h>
extern int write (int, const void *, size_t);
extern int read (int, void *, size_t);
off_t lseek (int, off_t, int);
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