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Revise NEWS description of changes to gettimeofday etc.

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Mostly English grammar and style improvements.  The bullet list is
reorganized a little for clarity.  The details of exactly which
Linux-based ports still report system-wide time zone information
from gettimeofday has been removed, as this is not intended to be
something people should rely on.

Also clarify the deprecation of older SPARC ISAs, based on the fact
that “SPARC version 7” is actually the very first version of the SPARC
ISA (Sun Microsystems was very fond of letting the marketing
department pick version numbers).

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Zack Weinberg 2020-01-08 15:23:12 -05:00
parent 97ff54d2fc
commit 521c7fc65f
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1 changed files with 38 additions and 25 deletions
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63
NEWS
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@ -21,19 +21,6 @@ Major new features:
18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
Clarification Request 13 to TS 18661-3.
* The gettimeofday function will no longer report information about a
system-wide time zone, expect for aarch64, powerpc, and x86 on Linux
which still uses the vDSO symbol (when available).
This 4.2-BSD-era feature has been deprecated for many years, as it cannot
handle the full complexity of the world's timezones, but hitherto we have
supported it on a best-effort basis. Changes required to support 64-bit
time_t on 32-bit architectures have made this no longer practical.
As of this release, callers of gettimeofday with a non-null 'tzp' argument
will always receive a 'struct timezone' whose tz_minuteswest and
tz_dsttime fields are zero.
* The function pthread_clockjoin_np has been added, enabling join with a
terminated thread with a specific clock. It allows waiting against
CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
@ -59,8 +46,34 @@ Deprecated and removed features, and other changes affecting compatibility:
floating-point arguments directly will continue to work.
* The obsolete function stime is no longer available to newly linked
binaries and it has been removed from <time.h> header. This function
has been deprecated in favor of clock_settime.
binaries, and its declaration has been removed from <time.h>.
Programs that set the system time should use clock_settime instead.
* We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
in a future version of glibc. In this release, the header still exists
but calling ftime will cause a compiler warning. All programs should use
gettimeofday or clock_gettime instead.
* The gettimeofday function no longer reports information about a
system-wide time zone. This 4.2-BSD-era feature has been deprecated for
many years, as it cannot handle the full complexity of the world's
timezones, but hitherto we have supported it on a best-effort basis.
Changes required to support 64-bit time_t on 32-bit architectures have
made this no longer practical.
As of this release, callers of gettimeofday with a non-null 'tzp' argument
should expect to receive a 'struct timezone' whose tz_minuteswest and
tz_dsttime fields are zero. (For efficiency reasons, this does not always
happen on a few Linux-based ports. This will be corrected in a future
release.)
All callers should supply a null pointer for the 'tzp' argument to
gettimeofday. For accurate information about the time zone associated
with the current time, use the localtime function.
gettimeofday itself is obsolescent according to POSIX. We have no plans
to remove access to this function, but portable programs should consider
using clock_gettime instead.
* The settimeofday function can still be used to set a system-wide time
zone when the operating system supports it. This is because the Linux
@ -80,18 +93,18 @@ Deprecated and removed features, and other changes affecting compatibility:
becomes available, we will change settimeofday to fail with ENOSYS on all
platforms when its 'tzp' argument is not a null pointer.
Note that settimeofday itself is obsolescent according to POSIX.
Programs that set the system time should use clock_settime and/or
the adjtime family of functions instead. We may also cease to make
settimeofday available to newly linked binaries after there is a
replacement for Linux's time-zone-like offset API.
settimeofday itself is obsolescent according to POSIX. Programs that set
the system time should use clock_settime and/or the adjtime family of
functions instead. We may cease to make 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.
* SPARC ISA v7 is no longer supported. v8 is still supported, but only if
the optional CAS instruction is implemented (for instance, LEON processors
are still supported, but SuperSPARC processors are not).
* The sparc*-*linux-gnu configurations targeting v7 or order architecture
are no longer supported. For v8 only implementations with native CAS
instruction are still supported (such as LEON).
As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
configurations.
* If a lazy binding failure happens during dlopen, during the execution of
an ELF constructor, the process is now terminated. Previously, the