build
configure
deb-build
+deb-noadns
mdwopt.h
missing
mkinstalldirs
+COPYING
## -*-Makefile-*-
##
-## $Id: Makefile.am,v 1.41 2003/11/29 11:59:17 mdw Exp $
+## $Id: Makefile.am,v 1.42 2003/12/13 20:37:59 mdw Exp $
##
## Building the distribution
##
##----- Revision history ----------------------------------------------------
##
## $Log: Makefile.am,v $
+## Revision 1.42 2003/12/13 20:37:59 mdw
+## Add adns support in background resolver.
+##
## Revision 1.41 2003/11/29 11:59:17 mdw
## Various stuff.
##
lib_LTLIBRARIES = libmLib.la
pkglibexecdir = $(libexecdir)/$(PACKAGE)
-pkglibexec_PROGRAMS = bres
+pkglibexec_PROGRAMS = @BRES_LIBEXEC@
+EXTRA_PROGRAMS = bres
pkginclude_HEADERS = \
- align.h alloc.h arena.h bits.h exc.h quis.h report.h sub.h \
+ align.h alloc.h arena.h bits.h exc.h macros.h quis.h report.h sub.h \
trace.h track.h unihash.h \
pool.h \
atom.h assoc.h darray.h dstr.h dspool.h hash.h sym.h crc32.h \
## --- Things to put in the library ---
-libmLib_la_LDFLAGS = -version-info 2:2:0
+libmLib_la_LDFLAGS = -version-info 2:3:0
## Middle number is the patchlevel. Final number is the minor version. The
## difference between the first and last numbers is major version.
atom.c assoc.c darray.c dstr.c dputf.c dspool.c hash.c sym.c \
crc32.c crc32-tab.c \
env.c fdflags.c fdpass.c fwatch.c lock.c \
- bres.c conn.c lbuf.c ident.c pkbuf.c sel.c selbuf.c selpk.c sig.c \
+ @BRES_SOURCE@.c \
+ conn.c lbuf.c ident.c pkbuf.c sel.c selbuf.c selpk.c sig.c \
tv.c \
base64.c hex.c mdwopt.c str.c testrig.c url.c
+EXTRA_libmLib_la_SOURCES = bres.c bres-adns.c
+libmLib_la_LIBADD = @DEPLIBS@
BUILT_SOURCES = crc32-tab.c
## I must (a) build the standalone version, and (b) inform the client library
## where the standalone version is.
-bres: bres-stnd.o
+bres$(EXEEXT): bres-stnd.o
$(LINK) -o bres bres-stnd.o $(LIBS)
bres-stnd.o: $(srcdir)/bres.c
--- /dev/null
+/* -*-c-*-
+ *
+ * $Id: bres-adns.c,v 1.1 2003/12/13 20:37:59 mdw Exp $
+ *
+ * Background reverse name resolution (ADNS version)
+ *
+ * (c) 2003 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of the mLib utilities library.
+ *
+ * mLib is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * mLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with mLib; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ *
+ *
+ * HOWEVER, since GNU adns is covered by the full GNU General Public
+ * License, this file (only) is also covered by the full GNU GPL, and
+ * you may NOT take advantage of the more liberal conditions of the
+ * LGPL when modifying or redistributing this file. This doesn't mean
+ * that a program which uses the interface provided by this file is
+ * covered by the GPL, since @bres.c@ provides the same interface and
+ * is LGPL. However, it does mean that if your program depends, for
+ * some reason (e.g., to meet particular performance criteria), on
+ * this adns-based implementation of mLib's background resolver then it
+ * must be licensed under the full GPL.
+ */
+
+/*----- Revision history --------------------------------------------------*
+ *
+ * $Log: bres-adns.c,v $
+ * Revision 1.1 2003/12/13 20:37:59 mdw
+ * Add adns support in background resolver.
+ *
+ */
+
+#ifndef HAVE_ADNS
+# error "You need the ADNS library to compile this file."
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <assert.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+
+#include <adns.h>
+
+#include "alloc.h"
+#include "bres.h"
+#include "macros.h"
+#include "report.h"
+#include "sel.h"
+
+/*----- Static variables --------------------------------------------------*/
+
+static adns_state ads;
+static sel_state *sel;
+static sel_hook selhook;
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @bres_abort@ --- *
+ *
+ * Arguments: @bres_client *rc@ = pointer to client block
+ *
+ * Returns: ---
+ *
+ * Use: Removes a queued job.
+ */
+
+void bres_abort(bres_client *rc)
+{
+ if (rc->q == adns_r_addr) xfree(rc->u.name);
+ if (rc->a) free(rc->a);
+ adns_cancel(rc->aq);
+}
+
+/* --- @bres_byaddr@ --- *
+ *
+ * Arguments: @bres_client *rc@ = pointer to client block
+ * @struct in_addr addr@ = address to resolve
+ * @void (*func)(struct hostent *h, void *p)@ = handler function
+ * @void *p@ = argument for handler function
+ *
+ * Returns: ---
+ *
+ * Use: Adds an address lookup job to the queue. The job will be
+ * processed when there's a spare resolver process to deal with
+ * it.
+ */
+
+void bres_byaddr(bres_client *rc, struct in_addr addr,
+ void (*func)(struct hostent */*h*/, void */*p*/),
+ void *p)
+{
+ int e;
+ struct sockaddr_in sin;
+
+ if (!ads) goto fail;
+ sin.sin_family = AF_INET;
+ sin.sin_addr = addr;
+ sin.sin_port = 0;
+ if ((e = adns_submit_reverse(ads, (struct sockaddr *)&sin, adns_r_ptr,
+ 0, rc, &rc->aq)) != 0)
+ goto fail;
+ rc->a = 0;
+ rc->q = adns_r_ptr;
+ rc->u.addr = addr;
+ rc->func = func;
+ rc->p = p;
+ return;
+
+fail:
+ func(0, p);
+}
+
+/* --- @bres_byname@ --- *
+ *
+ * Arguments: @bres_client *rc@ = pointer to client block
+ * @const char *name@ = name to resolve
+ * @void (*func)(struct hostent *h, void *p)@ = handler function
+ * @void *p@ = argument for handler function
+ *
+ * Returns: ---
+ *
+ * Use: Adds a name lookup job to the queue. The job will be
+ * processed when there's a spare resolver process to deal with
+ * it.
+ */
+
+void bres_byname(bres_client *rc, const char *name,
+ void (*func)(struct hostent */*h*/, void */*p*/),
+ void *p)
+{
+ int e;
+
+ if (!ads) goto fail;
+ if ((e = adns_submit(ads, name, adns_r_addr,
+ adns_qf_search, rc, &rc->aq)) != 0)
+ goto fail;
+ rc->a = 0;
+ rc->q = adns_r_addr;
+ rc->u.name = xstrdup(name);
+ rc->func = func;
+ rc->p = p;
+ return;
+
+fail:
+ func(0, p);
+}
+
+/* --- @bres_exec@ --- *
+ *
+ * Arguments: @const char *file@ = file containing server code or null
+ *
+ * Returns: ---
+ *
+ * Use: Makes `bres' use a standalone server rather than copies of
+ * the current process. This can reduce memory consumption for
+ * large processes, at the expense of startup time (which
+ * shouldn't be too bad anyway, because of the resolver design).
+ * If the filename is null, a default set up at install time is
+ * used. It's probably a good idea to leave it alone.
+ */
+
+void bres_exec(const char *file)
+{
+ /* Nothin' doin' */
+}
+
+/* --- @report@ --- *
+ *
+ * Arguments: @bres_client *c@ = client descriptor block
+ * @adns_answer *a@ = A-record answer from resolver library
+ * @adns_rr_addr *av@ = vector of address records
+ * @int an@ = number of address records (must be positive)
+ * @char **nv@ = vector of name strings
+ * @int nn@ = number of name strings (must be positive)
+ *
+ * Returns: ---
+ *
+ * Use: Formats the given answer into a @struct hostent@ and reports
+ * it to the waiting client application.
+ */
+
+static void report(bres_client *rc, adns_answer *a,
+ adns_rr_addr *av, int an,
+ char **nv, int nn)
+{
+ struct hostent h;
+ char *n[16];
+ char *aa[16];
+ int i, j;
+
+ j = 0;
+ if (a->cname) n[j++] = a->cname;
+ else { n[j++] = *nv; nv++; nn--; }
+ for (i = 0; i < nn && j < N(n) - 1; i++)
+ if (strcmp(n[0], nv[i]) != 0) n[j++] = nv[i];
+ n[j++] = 0;
+ for (i = j = 0; i < an && j < N(av) - 1; i++) {
+ if (av[i].addr.sa.sa_family == AF_INET)
+ aa[j++] = (char *)&av[i].addr.inet.sin_addr;
+ }
+ aa[j++] = 0;
+ h.h_name = n[0];
+ h.h_aliases = n + 1;
+ h.h_addrtype = AF_INET;
+ h.h_length = sizeof(struct in_addr);
+ h.h_addr_list = aa;
+ rc->func(&h, rc->p);
+}
+
+/* --- @beforehook@, @afterhook@ --- *
+ *
+ * Arguments: @sel_state *s@ = select state
+ * @sel_args *sa@ = argument block
+ * @void *p@ = uninteresting pointer
+ *
+ * Returns: ---
+ *
+ * Use: Processes the selector's arguments before @select@ is
+ * called, to allow ADNS to do its thing.
+ */
+
+static void beforehook(sel_state *s, sel_args *sa, void *p)
+{
+ adns_beforeselect(ads, &sa->maxfd,
+ &sa->fd[SEL_READ], &sa->fd[SEL_WRITE], &sa->fd[SEL_EXC],
+ &sa->tvp, &sa->tv, &sa->now);
+}
+
+static void afterhook(sel_state *s, sel_args *sa, void *p)
+{
+ void *c;
+ bres_client *rc;
+ adns_query q;
+ adns_answer *a;
+ int e;
+ int i;
+
+ adns_afterselect(ads, sa->maxfd,
+ &sa->fd[SEL_READ], &sa->fd[SEL_WRITE], &sa->fd[SEL_EXC],
+ &sa->now);
+ while (q = 0, (e = adns_check(ads, &q, &a, &c)) == 0) {
+ rc = c;
+ if (a->status != 0)
+ goto fail;
+ else switch (rc->q) {
+ case adns_r_addr:
+ assert(a->type == adns_r_addr);
+ report(rc, a, a->rrs.addr, a->nrrs, &rc->u.name, 1);
+ free(rc->u.name);
+ free(a);
+ break;
+ case adns_r_ptr:
+ if (a->type == adns_r_ptr) {
+ rc->a = a;
+ if ((e = adns_submit(ads, a->rrs.str[0], adns_r_addr,
+ 0, rc, &q)) != 0)
+ goto fail;
+ rc->aq = q;
+ } else {
+ assert(a->type == adns_r_addr);
+ for (i = 0; i < a->nrrs; i++) {
+ if (a->rrs.addr[i].addr.sa.sa_family == AF_INET &&
+ a->rrs.addr[i].addr.inet.sin_addr.s_addr ==
+ rc->u.addr.s_addr)
+ goto match;
+ }
+ goto fail;
+ match:
+ report(rc, a, &a->rrs.addr[i], 1, rc->a->rrs.str, rc->a->nrrs);
+ free(rc->a);
+ free(a);
+ }
+ break;
+ default:
+ abort();
+ }
+ continue;
+
+ fail:
+ rc->func(0, rc->p);
+ if (rc->q == adns_r_addr) xfree(rc->u.name);
+ if (rc->a) free(rc->a);
+ free(a);
+ }
+}
+
+/* --- @bres_init@ --- *
+ *
+ * Arguments: @sel_state *s@ = pointer to select multiplexor
+ *
+ * Returns: ---
+ *
+ * Use: Initializes the background resolver for use.
+ */
+
+void bres_init(sel_state *s)
+{
+ int e;
+
+ if ((e = adns_init(&ads, 0, 0)) != 0) {
+ moan("adns_init failed: resolver won't work");
+ return;
+ }
+ sel_addhook(s, &selhook, beforehook, afterhook, 0);
+ sel = s;
+}
+
+/*----- That's all, folks -------------------------------------------------*/
/* -*-c-*-
*
- * $Id: bres.h,v 1.3 1999/12/10 23:42:04 mdw Exp $
+ * $Id: bres.h,v 1.4 2003/12/13 20:37:59 mdw Exp $
*
* Background reverse name resolution
*
/*----- Revision history --------------------------------------------------*
*
* $Log: bres.h,v $
+ * Revision 1.4 2003/12/13 20:37:59 mdw
+ * Add adns support in background resolver.
+ *
* Revision 1.3 1999/12/10 23:42:04 mdw
* Change header file guard names.
*
#include <arpa/inet.h>
#include <netdb.h>
+#ifdef HAVE_ADNS
+# include <adns.h>
+#endif
+
#include "sel.h"
#include "selbuf.h"
/* --- Client allocated request block --- */
typedef struct bres_client {
+#ifdef HAVE_ADNS
+ adns_query aq; /* ADNS query handle */
+ adns_answer *a; /* Answer for reverse resolution */
+ struct _unused *_pad1; /* And a spare slot */
+#else
struct bres_client *next, *prev; /* Queue of waiting resolve jobs */
struct bres_server *rs; /* Pointer to attached server */
+#endif
int q; /* Query type (name or address) */
union {
struct in_addr addr; /* Address to resolve */
dnl -*-m4-*-
dnl
-dnl $Id: configure.in,v 1.36 2003/11/29 20:38:38 mdw Exp $
+dnl $Id: configure.in,v 1.37 2003/12/13 20:37:59 mdw Exp $
dnl
dnl Configuration script for mLib
dnl
dnl ----- Revision history --------------------------------------------------
dnl
dnl $Log: configure.in,v $
+dnl Revision 1.37 2003/12/13 20:37:59 mdw
+dnl Add adns support in background resolver.
+dnl
dnl Revision 1.36 2003/11/29 20:38:38 mdw
dnl Debianization fixes.
dnl
mdw_CHECK_MANYLIBS(socket, socket)
mdw_CHECK_MANYLIBS(gethostbyname, nsl resolv)
+DEPLIBS=$LIBS AC_SUBST(DEPLIBS)
+BRES_LIBEXEC="bres" BRES_SOURCE="bres"
+AC_SUBST(BRES_LIBEXEC) AC_SUBST(BRES_SOURCE)
+AC_ARG_WITH(adns,
+[ --with-adns use ADNS library for background name resolution],
+[want_adns=$withval], [want_adns=auto])
+if test $want_adns != no; then
+ save_LIBS=$LIBS
+ LIBS=$DEPLIBS
+ mdw_CHECK_MANYLIBS(adns_init, adns, [have_adns=yes], [have_adns=no])
+ DEPLIBS=$LIBS
+ LIBS=$save_LIBS
+ if test $have_adns = yes; then
+ AC_DEFINE(HAVE_ADNS)
+ BRES_LIBEXEC=""
+ BRES_SOURCE="bres-adns"
+ elif test $want_adns = yes; then
+ AC_MSG_ERROR([ADNS library not found, but explicitly requested])
+ fi
+fi
+
AC_CACHE_CHECK([for msg_control], [mdw_cv_msg_control],
[AC_TRY_COMPILE(
[#include <sys/types.h>
mlib
*.substvars
mlib2
+mlib2-adns
* Add file descriptor passing.
- -- Mark Wooding <mdw@nsict.org> Sat, 29 Nov 2003 11:58:00 +0000
+ * Add ADNS-based background resolver.
+
+ -- Mark Wooding <mdw@nsict.org> Sat, 13 Dec 2003 19:54:22 +0000
mlib (2.0.2) experimental; urgency=low
Section: libs
Priority: extra
Maintainer: Mark Wooding <mdw@nsict.org>
-Build-Depends: debhelper (>= 4.0.2)
+Build-Depends: debhelper (>= 4.0.2), libadns1-dev
Standards-Version: 3.1.1
Package: mlib2
Architecture: any
Depends: ${shlibs:Depends}
+Conflicts: mlib2-adns
Description: A library of miscellaneous stuff
+ The mLib library provides various handy utilities, including
+ * yet another options parser, like GNU getopt but more so;
+ * a suite for writing event-driven select-based servers;
+ * a simple exception-handling system, based on longjmp;
+ * dynamically resizing strings and arrays;
+ * a resizing hashtable;
+ * base64 and hex encoding and decoding; and
+ * a simple background DNS resolver.
+ This package provides the mLib run-time library. It uses an
+ implementation of the background resolver forks and calls
+ gethostbyname, so it therefore (a) depends only on the standard
+ C library, and (b) is distributed under the terms of the GNU
+ LGPL or GPL.
+
+Package: mlib2-adns
+Architecture: any
+Depends: ${shlibs:Depends}
+Conflicts: mlib2
+Description: A library of miscellaneous stuff
+ The mLib library provides various handy utilities, including
+ * yet another options parser, like GNU getopt but more so;
+ * a suite for writing event-driven select-based servers;
+ * a simple exception-handling system, based on longjmp;
+ * dynamically resizing strings and arrays;
+ * a resizing hashtable;
+ * base64 and hex encoding and decoding; and
+ * a simple background DNS resolver.
+ This package provides the mLib run-time library. It uses an
+ implementation of the background resolver based on the GNU adns
+ resolver, and therefore (a) depends on the libadns1 package, and
+ (b) is distributed under the terms of the full GPL only.
Package: mlib-dev
Architecture: any
-Depends: mlib2 (= ${Source-Version}), libc6-dev
+Depends: mlib2 (= ${Source-Version}) | mlib2-adns (= ${Source-Version}),
+ libc6-dev
Description: A library of miscellaneous stuff
+ The mLib library provides various handy utilities, including
+ * yet another options parser, like GNU getopt but more so;
+ * a suite for writing event-driven select-based servers;
+ * a simple exception-handling system, based on longjmp;
+ * dynamically resizing strings and arrays;
+ * a resizing hashtable;
+ * base64 and hex encoding and decoding; and
+ * a simple background DNS resolver.
This package contains the header files and static libraries needed to
compile programs which use mLib.
/usr/share/common-licenses/LGPL-2; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
+
--- /dev/null
+mLib is copyright (c) 2003 Straylight/Edgeware
+
+mLib is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2 of the License, or (at your
+option) any later version.
+
+mLib is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+License for more details.
+
+You should have a copy of the GNU General Public License in
+/usr/share/common-licenses/GPL-2; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+USA.
+
+
+The usual version of mLib is distributed under the terms of the weaker
+GNU Library General Public License, version 2. However, this version of
+mLib uses the GNU adns library as its background DNS resolver, and is
+therefore subject to the full GPL only. This doesn't mean that you must
+apply the GPL to your program just because it uses mLib, even if it uses
+the `bres' background resolver interface: you only need to do that if
+you depend on the adns version specifically, e.g., to acheive some
+performance criterion.
export DH_COMPAT = 4
build:
- rm -rf deb-build build; mkdir deb-build
+ rm -rf deb-build deb-noadns build; mkdir deb-build deb-noadns
cd deb-build; ../configure \
+ --with-adns \
--prefix=/usr \
--mandir=/usr/share/man \
--libexecdir=/usr/lib
make -C deb-build
make -C deb-build check
+ cd deb-noadns; ../configure \
+ --without-adns \
+ --prefix=/usr \
+ --mandir=/usr/share/man \
+ --libexecdir=/usr/lib
+ make -C deb-noadns
+ make -C deb-noadns check
touch build
clean:
install: build
dh_clean
- make -C deb-build install DESTDIR=`pwd`/debian/mlib2
+ make -C deb-noadns install DESTDIR=`pwd`/debian/mlib2
mkdir -p debian/mlib-dev/usr/lib
mkdir -p debian/mlib-dev/usr/share/man
mkdir -p debian/mlib-dev/usr/bin
mv debian/mlib2/usr/lib/*.so debian/mlib-dev/usr/lib
mv debian/mlib2/usr/lib/*.la debian/mlib-dev/usr/lib
mv debian/mlib2/usr/include debian/mlib-dev/usr
+ make -C deb-build install DESTDIR=`pwd`/debian/mlib2-adns
+ rm debian/mlib2-adns/usr/bin/mLib-config
+ rm -r debian/mlib2-adns/usr/share/man/man3
+ rm debian/mlib2-adns/usr/lib/*.a
+ rm debian/mlib2-adns/usr/lib/*.so
+ rm debian/mlib2-adns/usr/lib/*.la
+ rm -rf debian/mlib2-adns/usr/include
dh_strip -a
binary-indep:
binary-arch: install
dh_testdir -a
dh_testroot -a
- dh_makeshlibs -a -V
+ dh_makeshlibs -a -V"mlib2 (>= 2.0.3) | mlib2-adns (>= 2.0.3)"
dh_installman -a
dh_compress -a
dh_installdocs -a
--- /dev/null
+/* -*-c-*-
+ Handy macrosose]]
+ *
+ * (c) 2003 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of the mLib utilities library.
+ *
+ * mLib is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * mLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with mLib; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Revision history --------------------------------------------------*
+ *
+ * $Log: macros.h,v $
+ * Revision 1.1 2003/12/13 20:37:59 mdw
+ * Add adns support in background resolver.
+ *
+ */
+
+#ifndef MLIB_MACROS_H
+#define MLIB_MACROS_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Macros provided ---------------------------------------------------*/
+
+#define N(v) (sizeof(v)/sizeof(*v))
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
## -*-makefile-*-
##
-## $Id: Makefile.am,v 1.5 2003/11/29 11:59:17 mdw Exp $
+## $Id: Makefile.am,v 1.6 2003/12/13 20:37:59 mdw Exp $
##
## Makefile for mLib's manual pages
##
##----- Revision history ----------------------------------------------------
##
## $Log: Makefile.am,v $
+## Revision 1.6 2003/12/13 20:37:59 mdw
+## Add adns support in background resolver.
+##
## Revision 1.5 2003/11/29 11:59:17 mdw
## Various stuff.
##
crc32.3 darray.3 dspool.3 dstr.3 env.3 exc.3 fdflags.3 fwatch.3 \
hash.3 ident.3 lbuf.3 lock.3 mLib.3 mdwopt.3 pkbuf.3 pool.3 \
quis.3 report.3 sel.3 selbuf.3 selpk.3 sig.3 str.3 sub.3 sym.3 \
- testrig.3 trace.3 tv.3 url.3 hex.3 fdpass.3
+ testrig.3 trace.3 tv.3 url.3 hex.3 fdpass.3 macros.3
install-man: $(MANPAGES)
@$(NORMAL_INSTALL)
cancels a running resolver job. When it returns, the client structure
is safe to discard.
.PP
-The resolver is currently implemented using a pool of server processes.
-Incoming resolver jobs are passed to an available server, or a new
-server is started if all are busy. There is a maximum number of
-servers, and jobs are queued once this limit is reached. Old servers
-which have been idle for a period of time are killed off. Servers are
-also killed if they start misbehaving or their jobs are aborted.
+There are two versions of
+.BR bres .
+The standard one uses a pool of server processes. Incoming resolver
+jobs are passed to an available server, or a new server is started if
+all are busy. There is a maximum number of servers, and jobs are queued
+once this limit is reached. Old servers which have been idle for a
+period of time are killed off. Servers are also killed if they start
+misbehaving or their jobs are aborted.
.PP
By default, servers are started simply by calling
.BR fork (2).
is the full pathname of the server program, or null to accept the
default set at library configuration time (which is usually correct).
.PP
+The other implementation of
+.B bres
+uses the
+.B adns
+library to do asynchronous resolution. It can cope with many more
+simultaneous resolver jobs, and doesn't use up external processes. If
+you're using the
+.BR adns -based
+resolver, then the
+.B bres_exec
+function does nothing at all.
+.PP
For security reasons, when an address is resolved, the hostname received
is verified by performing a forward lookup. If the forward lookup fails
to return the expected IP address, an error is reported.
--- /dev/null
+.\" -*-nroff-*-
+.TH macros 3 "13 December 2003" "Straylight/Edgeware" "mLib utilities library"
+.SH NAME
+macros \- useful macros
+.\" @N
+.SH SYNOPSIS
+.nf
+.B "#include <mLib/macros.h>"
+
+.BI "size_t N(" array ");"
+.fi
+.SH DESCRIPTION
+The
+.B N
+macro returns the number of elements in the named
+.IR array .
+.SH "SEE ALSO"
+.BR mLib (3).
+.SH "AUTHOR"
+Mark Wooding, <mdw@nsict.org>
~mdw / mLib / commitdiff