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ctime.3: ctime_r() and localtime_r() need not set 'timezone' and 'daylight' 

The man page already noted that these functions need not set
'tzname', but things could be clearer: it tzset() is not called,
then the other two variables also are not set.

Also, clarify that ctime() does set 'timezone' and 'daylight'.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2008-10-22 01:14:15 -05:00
parent e6068f213e
commit 546f67f3cd
1 changed files with 4 additions and 3 deletions
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7
man3/ctime.3
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@ -161,7 +161,8 @@ The abbreviations for the months are "Jan",
The return value points to a statically allocated string which
might be overwritten by subsequent calls to any of the date and time
functions.
The function also sets the external variable \fItzname\fP (see
The function also sets the external
variables \fItzname\fP, \fItimezone\fP, and \fIdaylight\fP (see
.BR tzset (3))
with information about the current timezone.
The reentrant version
@ -170,7 +171,7 @@ does the same, but stores the
string in a user-supplied buffer
which should have room for at least 26 bytes.
It need not
set \fItzname\fP.
set \fItzname\fP, \fItimezone\fP, and \fIdaylight\fP.
.PP
The
.BR gmtime ()
@ -203,7 +204,7 @@ The
.BR localtime_r ()
function does the same, but stores the data in a
user-supplied struct.
It need not set \fItzname\fP.
It need not set \fItzname\fP, \fItimezone\fP, and \fIdaylight\fP.
.PP
The
.BR asctime ()