Remove syscall wrappers around clock_gettime, closes 12091

12091 "Direct use of __NR_clock_gettime is not time64-safe".

function                                             old     new   delta
runsv_main                                          1698    1712     +14
startservice                                         378     383      +5
get_mono                                              31      25      -6
date_main                                            932     926      -6
gettimeofday_ns                                       17       -     -17
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 2/2 up/down: 19/-29)            Total: -10 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 3 insertions, 13 deletions

diff --git a/coreutils/date.c b/coreutils/date.c
index 731241536..f7e9a8d0e 100644
--- a/coreutils/date.c
+++ b/coreutils/date.c
@@ -33,10 +33,9 @@
 //config:       Enable option (-I) to output an ISO-8601 compliant
 //config:       date/time string.
 //config:
-//config:# defaults to "no": stat's nanosecond field is a bit non-portable
 //config:config FEATURE_DATE_NANO
 //config:       bool "Support %[num]N nanosecond format specifier"
-//config:       default n  # syscall(__NR_clock_gettime) or syscall(__NR_clock_gettime64)
+//config:       default n # stat's nanosecond field is a bit non-portable
 //config:       depends on DATE
 //config:       select PLATFORM_LINUX
 //config:       help
@@ -271,17 +270,8 @@ int date_main(int argc UNUSED_PARAM, char **argv)
                  */
 #endif
         } else {
-#if ENABLE_FEATURE_DATE_NANO && defined(__NR_clock_gettime)
-                /* libc has incredibly messy way of doing this,
-                 * typically requiring -lrt. We just skip all this mess */
-                syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts);
-#elif ENABLE_FEATURE_DATE_NANO && __TIMESIZE == 64
-                /* Let's only support the 64 suffix syscalls for 64-bit time_t.
-                 * This simplifies the code for us as we don't need to convert
-                 * between 64-bit and 32-bit. We also don't have a way to
-                 * report overflow errors here.
-                 */
-                syscall(__NR_clock_gettime64, CLOCK_REALTIME, &ts);
+#if ENABLE_FEATURE_DATE_NANO
+                clock_gettime(CLOCK_REALTIME, &ts);
 #else
                 time(&ts.tv_sec);
 #endif