K 10
svn:author
V 3
phk
K 8
svn:date
V 27
2006-08-07T20:12:18.000000Z
K 7
svn:log
V 733
Return length from fwopen() file callback instead of zero.

The symptom is that syslog() fails to log anything but the "ident"
string if LOG_PERROR is specified to openlog(3) and the extensible
printf is in action.

For unclear, likely quaint historical reasons, syslog uses fwopen()
on a stack buffer, rather than using the more straightforward
and faster snprintf().

Along the way, fflush(3) is called, and since the callback writer
function returns zero instead of the length "written", __SERR
naturally gets set on the filedescriptor.

The extensible printf, in difference from the normal printf refuses
to output anything to an __SERR marked filedescriptor, and thus
the actual syslog message is supressed.

MFC:	after 2 weeks

END