Hi Rodrick, Roderick wrote on Mon, Oct 05, 2020 at 03:16:24PM +0000:
> The result of time() has type time_t and we know what kind of number > goes there: seconds since 0 hours, 0 minutes, 0 seconds, January 1, > 1970, Coordinated Universal Time. > > In my FreeBSD running on a 64 bit processor this type is: int (__32_t). > It considers this size enough for above information. http://www.openbsd.org/lyrics.html#55 > In my OpenBSD running on a 32 bit processor this type is: long long > (__64_t). > > None of both has an unsigned type, although time moves forward > (more or less fast!!!). https://man.openbsd.org/mktime.3#RETURN_VALUES https://man.openbsd.org/time.3#RETURN_VALUES > Is there a reason for this discrepancy? Is there no standard for the > size of time_t? https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_types.h.html only says: time_t shall be an integer type. > And what does mean the types with __? I find it so confusing. :) Names starting with double underscores are reserved by the C standard, for example paragraphs 3.8.8 and 4.1.2 in C89, so an implementation of the C language can use them internally without risking conflicts with identifiers defined by conforming application programs. Yours, Ingo
