Datatypes used in C

Question

What is the difference between u_int32_t and uint32_t?

Answer 1

uint32_t is a standard C99 type u_int32_t is used internally in some POSIX implementations.

Answer 2

As others have mentioned, uint32_t is a standard C99 type.

Anyway, the takeaway is that if you're writing portable C code or C header files meant to be shared between different devices/architectures, you can use stdint.h.