Practice · 3 of 3
Sum a File Through mmap
CHALLENGE
Difficulty: advanced+25 XP
POSIX. Implement long sum_bytes_mmap(const char *path) — open O_RDONLY, fstat for size, mmap PROT_READ MAP_PRIVATE, sum all bytes as unsigned char, munmap, close, return the sum; return -1 on any failure (open/fstat/mmap/munmap). An empty file sums to 0.
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