glibc/time/Versions
Joseph Myers e5ac7bd679 Add C2X timespec_getres
ISO C2X adds a timespec_getres function alongside the C11
timespec_get, with functionality similar to that of POSIX clock_getres
(including allowing a NULL pointer to be passed to the function).
Implement this function for glibc, similarly to the implementation of
timespec_get.

This includes a basic test like that of timespec_get, but no
documentation in the manual, given that TIME_UTC and timespec_get
aren't documented in the manual at all.  The handling of 64-bit time
follows that in timespec_get; people maintaining patch series for
64-bit time will need to update them accordingly (to export
__timespec_getres64, redirect calls in time.h and run the test for
_TIME_BITS=64).

Tested for x86_64 and x86, and (previous version; only testcase
differs) with build-many-glibcs.py.
2021-05-17 20:55:21 +00:00

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libc {
GLIBC_2.0 {
# global variables
__daylight; __timezone; __tzname;
# functions with special/multiple interfaces
__adjtimex;
# functions used in other libraries
__gmtime_r; __gettimeofday;
# variables in normal name space
daylight; timezone; tzname;
# a*
adjtime; adjtimex; asctime; asctime_r;
# c*
clock; ctime; ctime_r;
# d*
difftime; dysize;
# f*
ftime;
# g*
getitimer; gettimeofday; gmtime; gmtime_r;
# l*
localtime; localtime_r;
# m*
mktime;
# s*
setitimer; settimeofday; stime; strftime; strptime;
# t*
time; timegm; timelocal; tzset;
}
GLIBC_2.1 {
# variables in normal name space
getdate_err;
# g*
getdate; getdate_r;
}
GLIBC_2.2 {
# w*
wcsftime;
# c*; actually in librt in version 2.2, moved to libc in 2.17
clock_getres; clock_gettime; clock_settime; clock_getcpuclockid;
clock_nanosleep;
}
GLIBC_2.3 {
# these internal names are used by libstdc++
__strftime_l; __wcsftime_l;
# s*
strftime_l;
# w*
wcsftime_l;
}
GLIBC_2.3.2 {
strptime_l;
}
GLIBC_2.16 {
timespec_get;
}
GLIBC_2.17 {
# c*
clock_getres; clock_gettime; clock_settime; clock_getcpuclockid;
clock_nanosleep;
}
GLIBC_2.34 {
timespec_getres;
}
GLIBC_PRIVATE {
# same as clock_gettime; used in other libraries
__clock_gettime;
__clock_gettime64;
}
}