On 2019年09月12日 11:05, tlake@twcny.rr.com wrote: > The code below returns -1. It shouldn't. Says who? I don't see anything in the specification which says that a null pointer argument is allowed: https://pubs.opengroup.org/onlinepubs/9699919799/functions/times.html Passing a null pointer to an ISO C or POSIX library function results in undefined behavior, except where it is documented otherwise. GNU/Linux (specifically the Glibc implementation of libc) also doesn't document any such extension (being able to pass a null pointer to times). So even in light of the goal of Cygwin providing GNU/Linux compatibility beyond POSIX, there is no justification for supporting times(0). > #include <sys/times.h> > #include <stdio.h> >> int main(int argc, char *argv[]) >> { > printf("return value %ld\n", (long)times((struct tms*)0)); The pointer cast is not required here; you have a prototype of the times function in scope; the equivalent times(0) will give you the undefined behavior you're asking for. > return 0; > } -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple