diff options
Diffstat (limited to 'time/sys/time.h')
| -rw-r--r-- | time/sys/time.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/time/sys/time.h b/time/sys/time.h index 21fa9ed451..6b6f71d2e5 100644 --- a/time/sys/time.h +++ b/time/sys/time.h @@ -66,6 +66,30 @@ struct timezone extern int gettimeofday (struct timeval *__restrict __tv, void *__restrict __tz) __THROW __nonnull ((1)); +#if __GNUC_PREREQ (4,3) && defined __REDIRECT && defined __OPTIMIZE__ +/* Issue a warning for use of gettimeofday with a non-null __tz argument. */ +__warndecl (__warn_gettimeofday_nonnull_timezone, + "gettimeofday with non-null or non-constant timezone parameter;" + " this is obsolete and inaccurate, use localtime instead"); + +extern int __REDIRECT_NTH (__gettimeofday_alias, + (struct timeval *__restrict __tv, + void *__restrict __tz), gettimeofday) + __nonnull ((1)); + +/* The double cast below works around a limitation in __builtin_constant_p + in all released versions of GCC (as of August 2019). + See <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91554>. */ +__fortify_function int +__NTH (gettimeofday (struct timeval *__restrict __tv, void *__restrict __tz)) +{ + if (! (__builtin_constant_p ((short) (__intptr_t) __tz) && __tz == 0)) + __warn_gettimeofday_nonnull_timezone (); + + return __gettimeofday_alias (__tv, __tz); +} +#endif + #ifdef __USE_MISC /* Set the current time of day and timezone information. This call is restricted to the super-user. |