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authorLukasz Majewski <lukma@denx.de>2020-01-16 23:14:27 +0100
committerLukasz Majewski <lukma@denx.de>2020-02-07 17:55:08 +0100
commitd2e3b697da2433c08702f95c76458c51545c3df1 (patch)
treedcc2de815738f5adfc289bbf5e80a3e8269cd3e2 /include
parent29bf83ccd75f865b0f551e7d10f18e6bb8d026bc (diff)
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y2038: linux: Provide __settimeofday64 implementation
This patch provides new __settimeofday64 explicit 64 bit function for setting
64 bit time in the kernel (by internally calling __clock_settime64).
Moreover, a 32 bit version - __settimeofday has been refactored to internally
use __settimeofday64.

The __settimeofday is now supposed to be used on systems still supporting 32
bit time (__TIMESIZE != 64) - hence the necessary conversion of struct
timeval to 64 bit struct __timespec64.

Internally the settimeofday uses __settimeofday64. This patch is necessary
for having architectures with __WORDSIZE == 32 Y2038 safe.

Build tests:
./src/scripts/build-many-glibcs.py glibcs

Run-time tests:
- Run specific tests on ARM/x86 32bit systems (qemu):
  https://github.com/lmajewski/meta-y2038 and run tests:
  https://github.com/lmajewski/y2038-tests/commits/master

Above tests were performed with Y2038 redirection applied as well as without
to test proper usage of both __settimeofday64 and __settimeofday.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'include')
-rw-r--r--include/time.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/time.h b/include/time.h
index a80953d5dd..73f66277ac 100644
--- a/include/time.h
+++ b/include/time.h
@@ -8,6 +8,7 @@
 # include <time/mktime-internal.h>
 # include <endian.h>
 # include <time-clockid.h>
+# include <sys/time.h>
 
 extern __typeof (strftime_l) __strftime_l;
 libc_hidden_proto (__strftime_l)
@@ -224,6 +225,14 @@ extern int __sched_rr_get_interval64 (pid_t pid, struct __timespec64 *tp);
 libc_hidden_proto (__sched_rr_get_interval64);
 #endif
 
+#if __TIMESIZE == 64
+# define __settimeofday64 __settimeofday
+#else
+extern int __settimeofday64 (const struct __timeval64 *tv,
+                             const struct timezone *tz);
+libc_hidden_proto (__settimeofday64)
+#endif
+
 /* Compute the `struct tm' representation of T,
    offset OFFSET seconds east of UTC,
    and store year, yday, mon, mday, wday, hour, min, sec into *TP.