Fix bug #7785 - atime limit.

On a 64-bit time_t system make MAX_TIME_T the max value that
can be represented in a struct tm. This allows applications to
set times in the future beyond the 32-bit time_t limit (2037).

This is only in source3/configure.in, needs adding to the waf
configure/build system (but I'll need help with that).

Jeremy.
(cherry picked from commit ff6c598f7f18e6ba945a3fe082b01255a0a42325)

diff --git a/source3/configure.in b/source3/configure.in
index 3dc9da77ce220ceabb4ef430ff2dc60bafc420bf..3bd5c2b2d4feb5138035b073600d6d299cc97c4f 100644 (file)
--- a/source3/configure.in
+++ b/source3/configure.in
@@ -2039,6 +2039,31 @@ if test x"$samba_cv_SIZEOF_TIME_T" = x"yes"; then
     AC_DEFINE(SIZEOF_TIME_T,8,[The size of the 'time_t' type])
 fi
 
+AC_CACHE_CHECK([for TIME_T_MAX],samba_cv_TIME_T_MAX,[
+AC_TRY_RUN([#include <time.h>
+main() {
+       struct tm *tm;
+       if (sizeof(time_t) == 8) {
+               time_t max_time = 0x7fffffffffffffffll;
+               tm = gmtime(&max_time);
+               /* This should fail with 32-bit tm_year. */
+               if (tm == NULL) {
+                       /* Max time_t that works with 32-bit int tm_year in struct tm. */
+                       max_time = 67768036191676799ll;
+                       tm = gmtime(&max_time);
+                       if (tm) {
+                               exit(0);
+                       }
+               }
+       }
+       exit(1);
+}],
+samba_cv_TIME_T_MAX=yes,samba_cv_TIME_T_MAX=no,samba_cv_TIME_T_MAX=cross)])
+if test x"$samba_cv_TIME_T_MAX" = x"yes"; then
+    AC_DEFINE(TIME_T_MAX,67768036191676799ll,[The maximum value of the 'time_t' type])
+fi
+
+
 AC_CACHE_CHECK([for 64 bit off_t],samba_cv_SIZEOF_OFF_T,[
 AC_TRY_RUN([#include <stdio.h>
 #include <sys/stat.h>