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Merged
merged 4 commits into from
Jul 17, 2019
Merged

libc/minimal: add support for gmtime and its reverse "timegm" #17468

merged 4 commits into from
Jul 17, 2019

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pabigot
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@pabigot pabigot commented Jul 10, 2019 •
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This PR replaces #17003, using the standard name gmtime for conversion between struct tm and time_t. The gmtime function is added to minimal libc, and a sys library supporting time-related operations is added for the reverse function compatible with the GLIBC timegm extension.

This adds the POSIX gmtime_r instead of the C gmtime_s because the former is more common and, in fact, is currently used in stm32 drivers.

@pabigot pabigot added area: C Library C Standard Library area: API Changes to public APIs labels Jul 10, 2019
@pabigot pabigot added this to the 2.0 milestone Jul 10, 2019
@pabigot pabigot requested review from nashif and pfalcon July 10, 2019 16:13
@pabigot pabigot changed the title add support for gmtime and its reverse "timegm" libc/minimal: add support for gmtime and its reverse "timegm" Jul 10, 2019
@zephyrbot zephyrbot added the area: Tests Issues related to a particular existing or missing test label Jul 10, 2019
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Found the following issues, please fix and resubmit:

License issues

In most cases you do not need to do anything here, especially if the files
reported below are going into ext/ and if license was approved for inclusion
into ext/ already. Fix any missing license/copyright issues. The license
exception if a JFYI for the maintainers and can be overriden when merging the
pull request.

  • lib/libc/minimal/source/time/gmtime.c is not apache-2.0 licensed: public-domain
  • lib/libc/minimal/source/time/gmtime.c has non-permissive license: public-domain
  • lib/os/timeutil.c is not apache-2.0 licensed: public-domain
  • lib/os/timeutil.c has non-permissive license: public-domain

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pabigot commented Jul 10, 2019 •
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I've updated the code so the words "public domain" are in a separate comment from the one that provides the proper SPDX-License-Identifier. Apparently that wasn't good enough for CI, but this seems to be the best we do in this situation since SPDX doesn't support structured acknowledgement of public domain origins without a registered dedication, and that's way too much work.

Found the following issues, please fix and resubmit:

License issues

In most cases you do not need to do anything here, especially if the files
reported below are going into ext/ and if license was approved for inclusion
into ext/ already. Fix any missing license/copyright issues. The license
exception if a JFYI for the maintainers and can be overriden when merging the
pull request.

  • lib/libc/minimal/source/time/gmtime.c is not apache-2.0 licensed: public-domain
  • lib/libc/minimal/source/time/gmtime.c has non-permissive license: public-domain
  • lib/os/timeutil.c is not apache-2.0 licensed: public-domain
  • lib/os/timeutil.c has non-permissive license: public-domain

@MaureenHelm MaureenHelm modified the milestones: 2.0, v2.0.0 Jul 10, 2019
pabigot added 4 commits July 11, 2019 10:31
@pabigot
libc: minimal: provide types in time.h
66f0ebe 
Provide definitions for a subset of the standard time types that must be
provided by this file, in anticipation of supporting civil time in
Zephyr.

Signed-off-by: Peter A. Bigot <[email protected]>
@pabigot
libc: minimal: provide gmtime implementation
515fe56 
Implement the conversion from UNIX time to broken-down civil time per
the gmtime() and gmtime_r() functions.

Signed-off-by: Peter A. Bigot <[email protected]>
@pabigot
sys: timeutil: add module
866e7d1 
Add a generic API to provide the inverse operation for gmtime and as a
home for future generic time-related functions that are not in POSIX.

Signed-off-by: Peter A. Bigot <[email protected]>
@pabigot
tests/lib/timeutil: add tests for time conversions
4e53c36 
This verifies gmtime and timeutil_timegm against each other and
reference data for a wide range of instances.

Signed-off-by: Peter A. Bigot <[email protected]>
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pabigot commented Jul 11, 2019

I've decoupled this from the POSIX subsystem, hopefully reducing any impediments to it being processed towards a merge.

There's nothing I can do about the license check failure, which seems to be based on the words "public domain" appearing in the file outside the license block.

@pabigot pabigot mentioned this pull request Jul 15, 2019
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pfalcon
pfalcon approved these changes Jul 16, 2019
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Looks good, thanks for refactoring. (Can't vouch that there's nothing to improve here or something won't need a change later, but definitely looks good for the initial in, and surely useful).

carlescufi
carlescufi approved these changes Jul 17, 2019
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This looks good and addresses all the discussion points that we have raised priorly

@carlescufi carlescufi merged commit 7251d8c into zephyrproject-rtos:master Jul 17, 2019
@pabigot pabigot deleted the pr/20190710a branch July 17, 2019 12:49
@PiotrZierhoffer PiotrZierhoffer mentioned this pull request Jul 25, 2019
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@pfalcon pfalcon pfalcon approved these changes

@carlescufi carlescufi carlescufi approved these changes

@nashif nashif Awaiting requested review from nashif

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