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time.7: Mention clock_gettime()/clock_settime() rather than [gs]ettimeofday() 

gettimeofday() is declared obsolete by POSIX. Mention instead
the modern APIs for working with the realtime clock.

See https://bugzilla.kernel.org/show_bug.cgi?id=199049

Reported-by: Enrique Garcia <cquike@arcor.de>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2018-03-09 08:57:45 +01:00
parent 8f8b643d85
commit 39ad46695f
1 changed files with 7 additions and 4 deletions
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man7/time.7
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@ -130,15 +130,18 @@ UNIX systems represent time in seconds since the
.PP
A program can determine the
.I "calendar time"
using
.BR gettimeofday (2),
which returns time (in seconds and microseconds) that have
via the
.BR clock_gettime (2)
.BR CLOCK_REALTIME
clock,
which returns time (in seconds and nanoseconds) that have
elapsed since the Epoch;
.BR time (2)
provides similar information, but only with accuracy to the
nearest second.
The system time can be changed using
.BR settimeofday (2).
.BR clock_settime (2).
.\"
.SS Broken-down time
Certain library functions use a structure of
type