time: Fix overflow itimer tests on 32-bit systems

On the port of OpenRISC I am working on and it appears the rv32 port
we have sets __TIMESIZE == 64 && __WORDSIZE == 32.  This causes the
size of time_t to be 8 bytes, but the tv_sec in the kernel is still 32-bit
causing truncation.

The truncations are unavoidable on these systems so skip the
testing/failures by guarding with __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64.

Also, futher in the tests and in other parts of code checking for time_t
overflow does not work on 32-bit systems when time_t is 64-bit.  As
suggested by Adhemerval, update the in_time_t_range function to assume
32-bits by using int32_t.

This also brings in the header for stdint.h so we can update other
usages of __int32_t to int32_t as suggested by Adhemerval.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/include/time.h b/include/time.h
index 22b29ca583..127347eb90 100644
--- a/include/time.h
+++ b/include/time.h
@@ -11,6 +11,7 @@
 # include <sys/time.h>
 # include <time-clockid.h>
 # include <sys/time.h>
+# include <stdint.h>
 
 extern __typeof (strftime_l) __strftime_l;
 libc_hidden_proto (__strftime_l)
@@ -342,11 +343,12 @@ libc_hidden_proto (__time64)
    actual clock ID.  */
 #define CLOCK_IDFIELD_SIZE	3
 
-/* Check whether T fits in time_t.  */
+/* Check whether T fits in int32_t, assume all usages are for
+   sizeof(time_t) == 32.  */
 static inline bool
 in_time_t_range (__time64_t t)
 {
-  time_t s = t;
+  int32_t s = t;
   return s == t;
 }
 
@@ -453,8 +455,8 @@ timespec64_to_timeval64 (const struct __timespec64 ts64)
    and suseconds_t.  */
 struct __timeval32
 {
-  __int32_t tv_sec;         /* Seconds.  */
-  __int32_t tv_usec;        /* Microseconds.  */
+  int32_t tv_sec;         /* Seconds.  */
+  int32_t tv_usec;        /* Microseconds.  */
 };
 
 /* Conversion functions for converting to/from __timeval32  */