Consolidate and deprecate ftime

ftime is an obsolete variation on gettimeofday, offering only
millisecond time resolution; it was probably a system call in ooold
versions of BSD Unix.  For historic reasons, we had three
implementations of it.  These are all consolidated into time/ftime.c,
and then the function is deprecated.

For some reason, the implementation of ftime in terms of gettimeofday
was rounding rather than truncating microseconds to milliseconds.  In
all the other places where we use a higher-resolution time function to
implement a lower-resolution one, we truncate.  ftime is changed to
match, just for tidiness' sake.

Like gettimeofday, ftime tries to report the time zone, and using that
information is always a bug.  This patch dummies out the reported
timezone information; the timezone and dstflag fields of the
returned "struct timeb" will always be zero.

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

Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: Lukasz Majewski <lukma@denx.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index b066c75db3..7e9d36e180 100644
--- a/NEWS
+++ b/NEWS
@@ -58,6 +58,9 @@ Deprecated and removed features, and other changes affecting compatibility:
   settimeofday available to newly linked binaries after there is a
   replacement for Linux's time-zone-like offset API.
 
+* The obsolete functions ftime has been deprecated and will be removed from
+  a future version of glibc.  Application should use clock_gettime instead.
+
 Changes to build and runtime requirements:
 
   [Add changes to build and runtime requirements here]