tags 607398 fixed-upstream thanks Petr, On Sat, May 16, 2009 at 5:17 AM, Petr Baudis <pasky@xxxxxxx> wrote: > The single-request option was introduced with glibc-2.10. > > Also, a note is added to resolver(3) that many of the options > are actually described in resolv.conf(5). > > Signed-off-by: Petr Baudis <pasky@xxxxxxx> > > --- > > Ping, what about the other patches? ;-) > > diff --git a/man3/resolver.3 b/man3/resolver.3 > index eabc1a4..181468a 100644 > --- a/man3/resolver.3 > +++ b/man3/resolver.3 > @@ -232,6 +232,9 @@ domain and in parent domains. > This option is used by > .BR gethostbyname (3). > [Enabled by default]. > +.PP > +This list is not complete. You can find some other flags described in > +.BR resolv.conf (5). > .SH "RETURN VALUE" > The > .BR res_init () I applied these two patches separately. > diff --git a/man5/resolv.conf.5 b/man5/resolv.conf.5 > index 4d67c75..2a2c694 100644 > --- a/man5/resolv.conf.5 > +++ b/man5/resolv.conf.5 > @@ -231,6 +231,19 @@ sets > in > .IR _res.options . > This enables support for the DNS extensions described in RFC\ 2671. > +.TP > +.BR single-request " (since glibc 2.10)" > +sets > +.BR RES_SNGLKUP > +in > +.IR _res.options . > +By default, glibc performs IPv4 and IPv6 lookups in parallel since > +version 2.9 (though many distribution packages of glibc are known > +to disable that behavior in this version). Some appliance DNS servers > +cannot handle these queries properly and make the requests time out. > +This option disables the behavior and makes glibc perform the IPv6 > +and IPv4 requests sequentially (at the cost of some slowdown of the > +resolving process). > .RE > .LP > The \fIdomain\fP and \fIsearch\fP keywords are mutually exclusive. I applied a slightly modified version of the above patch that dropped the details about distros. See below. These patches will appear in man-pages-3.40. Cheers, Michael --- a/man5/resolv.conf.5 +++ b/man5/resolv.conf.5 @@ -231,6 +231,19 @@ sets in .IR _res.options . This enables support for the DNS extensions described in RFC\ 2671. +.TP +.BR single-request " (since glibc 2.10)" +sets +.BR RES_SNGLKUP +in +.IR _res.options . +By default, glibc performs IPv4 and IPv6 lookups in parallel since +version 2.9. +Some appliance DNS servers +cannot handle these queries properly and make the requests time out. +This option disables the behavior and makes glibc perform the IPv6 +and IPv4 requests sequentially (at the cost of some slowdown of the +resolving process). .RE .LP The \fIdomain\fP and \fIsearch\fP keywords are mutually exclusive. -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Author of "The Linux Programming Interface"; http://man7.org/tlpi/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
