Use clock_gettime to implement timespec_get.

timespec_get is the same function as clock_gettime, with an obnoxious
coating of NIH painted on it by the ISO C committee.  In addition to
the rename, it takes its arguments in a different order, it returns 0
on *failure* or a positive number on *success*, and it requires that
all of its TIME_* constants be positive.  This last means we cannot
directly reuse the existing CLOCK_* constants for it, because
those have been allocated starting with CLOCK_REALTIME = 0 on all
existing platforms.

This patch simply promotes the sysdeps/posix implementation to
universal, and removes the Linux-specific implementation, whose
apparent reason for existing was to cut out one function call's worth
of overhead.

Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc64le-linux-gnu,
powerpc64-linux-gnu, powerpc-linux-gnu, and aarch64-linux-gnu.

Reviewed-by: Lukasz Majewski <lukma@denx.de>

1 files changed, 4 insertions, 10 deletions

diff --git a/time/timespec_get.c b/time/timespec_get.c
index cef9a42..5124c74 100644
--- a/time/timespec_get.c
+++ b/time/timespec_get.c
@@ -22,16 +22,10 @@
 int
 timespec_get (struct timespec *ts, int base)
 {
-  switch (base)
+  if (base == TIME_UTC)
     {
-    case TIME_UTC:
-      /* Not supported.  */
-      return 0;
-
-    default:
-      return 0;
+      __clock_gettime (CLOCK_REALTIME, ts);
+      return base;
     }
-
-  return base;
+  return 0;
 }
-stub_warning (timespec_get)