How to find development information about struct timespec

I'm writing a C program using nftw() to walk a filesystem and retrieve file modification times for each file.

nftw() calls a supplied function pointer and provides a struct stat as an argument.

man stat(2) states that the time modification fields are:

struct timespec st_atim;  /* time of last access */
struct timespec st_mtim;  /* time of last modification */
struct timespec st_ctim;  /* time of last status change */

However, whilst man stat(2) provides an example of how to print the time fields, it doesn't tell me how to find information about struct timespec, nor how to query/manipulate the time modification fields.

How should I go about finding that information on my computer alone, without resorting to Google?

Solution

Typically one of the man pages describes what these structures contain. If you tell us your platform I can give further details. Otherwise, open up the header /usr/include/time.h to see what struct timespec is defined as.