There’s no guarantee in the POSIX standard that sizeof(int) >= sizeof(ssize_t), nor the other way around. Typically ssize_t is larger than int, but the safe and portable option in C99 is to use intmax_t instead for the argument and the return value.
The only guarantees you have wrt. the relationship between int and ssize_t are:
intcan store values of at least the range [-2^15 … 2^15-1] per ISO Cssize_tcan store values of at least the range [-1 … 2^15-1] per POSIX (see_POSIX_SSIZE_MAX).
(Interestingly, there isn’t even a guarantee that ssize_t can store the negative counterparts of its positive range. It’s not a signed size_t, but a “size type” with an error value.)
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