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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2019-10-24 17:52:30 +0000
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2019-10-30 17:05:14 -0300
commit0d563783490bf5b2d7d52cab205760fdff5d5650 (patch)
treee1578f3d2c36b1ee5b4f0fb84705141ebcf1d301 /time
parentc3f9aef063cd9d5911e20d4f2b919ff2914c7965 (diff)
downloadglibc-0d563783490bf5b2d7d52cab205760fdff5d5650.tar.gz
Use clock_gettime to implement time.
Change the default implementation of time to call clock_gettime, to align with new Linux ports that are expected to only implement __NR_clock_gettime. Arch-specific implementation that either call the time vDSO or route to gettimeofday vDSO are not removed. Also for Linux, CLOCK_REALTIME_COARSE is used instead of generic CLOCK_REALTIME clockid. This takes less CPU time and its behavior better matches what the current glibc does. Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc64le-linux-gnu, powerpc64-linux-gnu, powerpc-linux-gnu, and aarch64-linux-gnu. Co-authored-by: Zack Weinberg <zackw@panix.com> Reviewed-by: Lukasz Majewski <lukma@denx.de>
Diffstat (limited to 'time')
-rw-r--r--time/time.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/time/time.c b/time/time.c
index b53a06e29c..e6e5eeff7e 100644
--- a/time/time.c
+++ b/time/time.c
@@ -15,19 +15,18 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#include <errno.h>
#include <time.h>
+#include <time-clockid.h>
/* Return the time now, and store it in *TIMER if not NULL. */
time_t
time (time_t *timer)
{
- __set_errno (ENOSYS);
+ struct timespec ts;
+ __clock_gettime (TIME_CLOCK_GETTIME_CLOCKID, &ts);
- if (timer != NULL)
- *timer = (time_t) -1;
- return (time_t) -1;
+ if (timer)
+ *timer = ts.tv_sec;
+ return ts.tv_sec;
}
libc_hidden_def (time)
-
-stub_warning (time)