[saagarjha]

> _t suffix is the notion used to denote a typedef for a given type /* This example is from do_journal.c in e2fsprogs / struct journal_transaction_s { ... blk64_t start, end; ... }; typedef struct journal_transaction_s journal_transaction_t;

This is undefined behavior in POSIX.

[clarry]

And

    unsigned total(unsigned a, unsigned b) { return a + b; }

is undefined behavior in C.