time: Introduce function to check correctness of nanoseconds value

The valid_nanoseconds () static inline function has been introduced to
check if nanoseconds value is in the correct range - greater or equal to
zero and less than 1000000000.

The explicit #include <time.h> has been added to files where it was
missing.

The __syscall_slong_t type for ns has been used to avoid issues on x32.

Tested with:
- scripts/build-many-glibcs.py
- make PARALLELMFLAGS="-j12" && make PARALLELMFLAGS="-j12" xcheck on x86_64

1 files changed, 2 insertions, 2 deletions

diff --git a/io/ppoll.c b/io/ppoll.c
index a387924..6d156a8 100644
--- a/io/ppoll.c
+++ b/io/ppoll.c
@@ -22,6 +22,7 @@
 #include <stddef.h>	/* For NULL.  */
 #include <sys/poll.h>
 #include <sysdep-cancel.h>
+#include <time.h>
 
 
 int
@@ -33,8 +34,7 @@ ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
   /* poll uses a simple millisecond value.  Convert it.  */
   if (timeout != NULL)
     {
-      if (timeout->tv_sec < 0
-	  || timeout->tv_nsec < 0 || timeout->tv_nsec >= 1000000000)
+      if (timeout->tv_sec < 0 || ! valid_nanoseconds (timeout->tv_nsec))
 	{
 	  __set_errno (EINVAL);
 	  return -1;