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Date:      Sat, 28 Apr 2012 21:00:25 GMT
From:      dfilter@FreeBSD.ORG (dfilter service)
To:        freebsd-bugs@FreeBSD.org
Subject:   Re: bin/166660: commit references a PR
Message-ID:  <201204282100.q3SL0PGJ057124@freefall.freebsd.org>

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The following reply was made to PR bin/166660; it has been noted by GNATS.

From: dfilter@FreeBSD.ORG (dfilter service)
To: bug-followup@FreeBSD.org
Cc:  
Subject: Re: bin/166660: commit references a PR
Date: Sat, 28 Apr 2012 20:52:30 +0000 (UTC)

 Author: jlh
 Date: Sat Apr 28 20:52:20 2012
 New Revision: 234772
 URL: http://svn.freebsd.org/changeset/base/234772
 
 Log:
   Import stdbuf(1) and the shared library it relies on.
   This tool changes the default buffering behaviour of standard
   stdio streams.
   
   It only works on dynamic binaries.  To make it work for static
   ones it would require cluttering stdio because there no single
   entry point.
   
   PR:		166660
   Reviewed by:	current@, jhb
   Approved by:	kib (mentor)
   MFC after:	1 week
 
 Added:
   head/lib/libstdbuf/
   head/lib/libstdbuf/Makefile   (contents, props changed)
   head/lib/libstdbuf/libstdbuf.3   (contents, props changed)
   head/lib/libstdbuf/stdbuf.c   (contents, props changed)
   head/usr.bin/stdbuf/
   head/usr.bin/stdbuf/Makefile   (contents, props changed)
   head/usr.bin/stdbuf/stdbuf.1   (contents, props changed)
   head/usr.bin/stdbuf/stdbuf.c   (contents, props changed)
 Modified:
   head/lib/Makefile
   head/lib/libc/stdio/setbuf.3
   head/usr.bin/Makefile
 
 Modified: head/lib/Makefile
 ==============================================================================
 --- head/lib/Makefile	Sat Apr 28 20:34:14 2012	(r234771)
 +++ head/lib/Makefile	Sat Apr 28 20:52:20 2012	(r234772)
 @@ -104,6 +104,7 @@ SUBDIR=	${SUBDIR_ORDERED} \
  	${_libsmdb} \
  	${_libsmutil} \
  	libstand \
 +	libstdbuf \
  	libstdthreads \
  	${_libtelnet} \
  	${_libthr} \
 
 Modified: head/lib/libc/stdio/setbuf.3
 ==============================================================================
 --- head/lib/libc/stdio/setbuf.3	Sat Apr 28 20:34:14 2012	(r234771)
 +++ head/lib/libc/stdio/setbuf.3	Sat Apr 28 20:52:20 2012	(r234772)
 @@ -83,6 +83,9 @@ normally does) it is line buffered.
  The standard error stream
  .Dv stderr
  is always unbuffered.
 +Note that these defaults maybe be altered using the
 +.Xr stdbuf 1
 +utility.
  .Pp
  The
  .Fn setvbuf
 @@ -177,6 +180,7 @@ function returns what the equivalent
  .Fn setvbuf
  would have returned.
  .Sh SEE ALSO
 +.Xr stdbuf 1 ,
  .Xr fclose 3 ,
  .Xr fopen 3 ,
  .Xr fread 3 ,
 
 Added: head/lib/libstdbuf/Makefile
 ==============================================================================
 --- /dev/null	00:00:00 1970	(empty, because file is newly added)
 +++ head/lib/libstdbuf/Makefile	Sat Apr 28 20:52:20 2012	(r234772)
 @@ -0,0 +1,12 @@
 +# $FreeBSD$
 +
 +.include <bsd.own.mk>
 +
 +LIB=		stdbuf
 +SRCS=		stdbuf.c
 +SHLIB_MAJOR=	1
 +MAN=		libstdbuf.3
 +
 +WARNS?=		6
 +
 +.include <bsd.lib.mk>
 
 Added: head/lib/libstdbuf/libstdbuf.3
 ==============================================================================
 --- /dev/null	00:00:00 1970	(empty, because file is newly added)
 +++ head/lib/libstdbuf/libstdbuf.3	Sat Apr 28 20:52:20 2012	(r234772)
 @@ -0,0 +1,102 @@
 +.\" Copyright (c) 2012 Jeremie Le Hen <jlh@FreeBSD.org>
 +.\" All rights reserved.
 +.\"
 +.\" Redistribution and use in source and binary forms, with or without
 +.\" modification, are permitted provided that the following conditions
 +.\" are met:
 +.\" 1. Redistributions of source code and documentation must retain the above
 +.\"    copyright notice, this list of conditions and the following disclaimer.
 +.\" 2. Redistributions in binary form must reproduce the above copyright
 +.\"    notice, this list of conditions and the following disclaimer in the
 +.\"    documentation and/or other materials provided with the distribution.
 +.\"
 +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 +.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 +.\" SUCH DAMAGE.
 +.\"
 +.\" $FreeBSD$
 +.\"
 +.Dd April 28, 2012
 +.Dt LIBSTDBUF 3
 +.Os
 +.Sh NAME
 +.Nm libstdbuf
 +.Nd preloaded library to change standard streams initial buffering
 +.Sh DESCRIPTION
 +The
 +.Nm
 +library is meant to be preloaded with the
 +.Ev LD_PRELOAD
 +environment variable to as to change the initial buffering
 +of standard input, standard output and standard error streams.
 +.Pp
 +Although you may load and configure this library manually,
 +an utility,
 +.Xr stdbuf 1 ,
 +can be used to run a command with the appropriate environment variables.
 +.Sh ENVIRONMENT
 +Each stream can be configured indepentently through the following
 +environment variables (values are defined below):
 +.Bl -tag -width size -offset indent
 +.It Ev _STDBUF_I
 +Initial buffering definition for the standard input stream
 +.It Ev _STDBUF_O
 +Initial buffering definition for the standard output stream
 +.It Ev _STDBUF_E
 +Initial buffering definition for the standard error stream
 +.El
 +.Pp
 +Each variable may take one of the following values:
 +.Bl -tag -width size -offset indent
 +.It Qq 0
 +unbuffered
 +.It Qq L
 +line buffered
 +.It Qq B
 +fully buffered with the default buffer size
 +.It Ar size
 +fully buffered with a buffer of
 +.Ar size
 +bytes (suffixes 'k', 'M' and 'G' are accepted)
 +.El
 +.Sh EXAMPLE
 +In the following example, the stdout stream of the
 +.Xr awk 1
 +command
 +will be fully buffered by default because it does not refer
 +to a terminal.
 +.Nm
 +is used to force it to be line-buffered so
 +.Xr vmstat 8 Ns 's
 +output will not stall until the full buffer fills.
 +.Bd -literal -offset indent
 +# vmstat 1 | LD_PRELOAD=/usr/lib/libstdbuf.so \\
 +    STDBUF_1=L awk '$2 > 1 || $3 > 1' | cat -n
 +.Ed
 +.Pp
 +See also the manpage of
 +.Xr stdbuf 1
 +for a simpler way to do this.
 +.Sh HISTORY
 +The
 +.Nm
 +library first appeared in
 +.Fx 8.4 .
 +.Sh AUTHORS
 +.An -nosplit
 +The original idea of the
 +.Nm
 +command comes from
 +.An Padraig Brady
 +who implemented it in the GNU coreutils.
 +.An Jeremie Le Hen
 +implemented it on
 +.Fx .
 
 Added: head/lib/libstdbuf/stdbuf.c
 ==============================================================================
 --- /dev/null	00:00:00 1970	(empty, because file is newly added)
 +++ head/lib/libstdbuf/stdbuf.c	Sat Apr 28 20:52:20 2012	(r234772)
 @@ -0,0 +1,115 @@
 +/*-
 + * Copyright (c) 2012 Jeremie Le Hen <jlh@FreeBSD.org>
 + * All rights reserved.
 + *
 + * Redistribution and use in source and binary forms, with or without
 + * modification, are permitted provided that the following conditions
 + * are met:
 + * 1. Redistributions of source code must retain the above copyright
 + *    notice, this list of conditions and the following disclaimer.
 + * 2. Redistributions in binary form must reproduce the above copyright
 + *    notice, this list of conditions and the following disclaimer in the
 + *    documentation and/or other materials provided with the distribution.
 + *
 + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 + * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 + * SUCH DAMAGE.
 + *
 + * $FreeBSD$
 + */
 +
 +#include <err.h>
 +#include <errno.h>
 +#include <limits.h>
 +#include <stdio.h>
 +#include <stdlib.h>
 +#include <string.h>
 +
 +static const char *
 +stream_name(FILE *s)
 +{
 +
 +	if (s == stdin)
 +		return "stdin";
 +	if (s == stdout)
 +		return "stdout";
 +	if (s == stderr)
 +		return "stderr";
 +	/* This should not happen. */
 +	abort();
 +}
 +
 +static void
 +change_buf(FILE *s, const char *bufmode)
 +{
 +	char *unit;
 +	size_t bufsize;
 +	int mode;
 +
 +	bufsize = 0;
 +	if (bufmode[0] == '0' && bufmode[1] == '\0')
 +		mode = _IONBF;
 +	else if (bufmode[0] == 'L' && bufmode[1] == '\0')
 +		mode = _IOLBF;
 +	else if (bufmode[0] == 'B' && bufmode[1] == '\0') {
 +		mode = _IOFBF;
 +		bufsize = 0;
 +	} else {
 +		/*
 +		 * This library being preloaded, depending on libutil
 +		 * would lead to excessive namespace pollution.
 +		 * Thus we do not use expand_number().
 +		 */
 +		errno = 0;
 +		bufsize = strtol(bufmode, &unit, 0);
 +		if (errno == EINVAL || errno == ERANGE || unit == bufmode)
 +			warn("Wrong buffer mode '%s' for %s", bufmode,
 +			    stream_name(s));
 +		switch (*unit) {
 +		case 'G':
 +			bufsize *= 1024 * 1024 * 1024;
 +			break;
 +		case 'M':
 +			bufsize *= 1024 * 1024;
 +			break;
 +		case 'k':
 +			bufsize *= 1024;
 +			break;
 +		case '\0':
 +			break;
 +		default:
 +			warnx("Unknown suffix '%c' for %s", *unit,
 +			    stream_name(s));
 +			return;
 +		}
 +		mode = _IOFBF;
 +	}
 +	if (setvbuf(s, NULL, mode, bufsize) != 0)
 +		warn("Cannot set buffer mode '%s' for %s", bufmode,
 +		    stream_name(s));
 +}
 +
 +__attribute__ ((constructor)) static void
 +stdbuf(void)
 +{
 +	char *i_mode, *o_mode, *e_mode;
 +
 +	i_mode = getenv("_STDBUF_I");
 +	o_mode = getenv("_STDBUF_O");
 +	e_mode = getenv("_STDBUF_E");
 +
 +	if (e_mode != NULL)
 +		change_buf(stderr, e_mode);
 +	if (i_mode != NULL)
 +		change_buf(stdin, i_mode);
 +	if (o_mode != NULL)
 +		change_buf(stdout, o_mode);
 +}
 
 Modified: head/usr.bin/Makefile
 ==============================================================================
 --- head/usr.bin/Makefile	Sat Apr 28 20:34:14 2012	(r234771)
 +++ head/usr.bin/Makefile	Sat Apr 28 20:52:20 2012	(r234772)
 @@ -143,6 +143,7 @@ SUBDIR=	alias \
  	sockstat \
  	split \
  	stat \
 +	stdbuf \
  	su \
  	systat \
  	tabs \
 
 Added: head/usr.bin/stdbuf/Makefile
 ==============================================================================
 --- /dev/null	00:00:00 1970	(empty, because file is newly added)
 +++ head/usr.bin/stdbuf/Makefile	Sat Apr 28 20:52:20 2012	(r234772)
 @@ -0,0 +1,8 @@
 +# $FreeBSD$
 +
 +PROG=   stdbuf
 +SRCS=   stdbuf.c
 +
 +WARNS?=	6
 +
 +.include <bsd.prog.mk>
 
 Added: head/usr.bin/stdbuf/stdbuf.1
 ==============================================================================
 --- /dev/null	00:00:00 1970	(empty, because file is newly added)
 +++ head/usr.bin/stdbuf/stdbuf.1	Sat Apr 28 20:52:20 2012	(r234772)
 @@ -0,0 +1,116 @@
 +.\" Copyright (c) 2012 Jeremie Le Hen <jlh@FreeBSD.org>
 +.\" All rights reserved.
 +.\"
 +.\" Redistribution and use in source and binary forms, with or without
 +.\" modification, are permitted provided that the following conditions
 +.\" are met:
 +.\" 1. Redistributions of source code and documentation must retain the above
 +.\"    copyright notice, this list of conditions and the following disclaimer.
 +.\" 2. Redistributions in binary form must reproduce the above copyright
 +.\"    notice, this list of conditions and the following disclaimer in the
 +.\"    documentation and/or other materials provided with the distribution.
 +.\"
 +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 +.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 +.\" SUCH DAMAGE.
 +.\"
 +.\" $FreeBSD$
 +.\"
 +.Dd April 28, 2012
 +.Dt STDBUF 1
 +.Os
 +.Sh NAME
 +.Nm stdbuf
 +.Nd change standard streams initial buffering
 +.Sh SYNOPSIS
 +.Nm
 +.Op Fl e Ar bufdef
 +.Op Fl i Ar bufdef
 +.Op Fl o Ar bufdef
 +.Op Ar command Op ...
 +.Sh DESCRIPTION
 +.Nm
 +is used to change the initial buffering of standard input,
 +standard output and/or standard error streams for
 +.Ar command .
 +It relies on
 +.Xr libstdbuf 3
 +which is loaded and configured by
 +.Nm
 +through environment variables.
 +.Pp
 +The options are as follows:
 +.Bl -tag -width Ds
 +.It Fl e Ar bufdef
 +Set initial buffering of the standard error stream for
 +.Ar command
 +as defined by
 +.Ar bufdef
 +.Pq see Sx BUFFER DEFINITION .
 +.It Fl i Ar bufdef
 +Set initial buffering of the standard input stream for
 +.Ar command
 +as defined by
 +.Ar bufdef
 +.Pq see Sx BUFFER DEFINITION .
 +.It Fl o Ar bufdef
 +Set initial buffering of the standard output stream for
 +.Ar command
 +as defined by
 +.Ar bufdef
 +.Pq see Sx BUFFER DEFINITION .
 +.El
 +.Sh BUFFER DEFINITION
 +Buffer definition is the same as in
 +.Xr libstdbuf 3 :
 +.Bl -tag -width size -offset indent
 +.It Qq 0
 +unbuffered
 +.It Qq L
 +line buffered
 +.It Qq B
 +fully buffered with the default buffer size
 +.It Ar size
 +fully buffered with a buffer of
 +.Ar size
 +bytes (suffixes 'k', 'M' and 'G' are accepted)
 +.El
 +.Sh EXAMPLES
 +In the following example, the stdout stream of the
 +.Xr awk 1
 +command
 +will be fully buffered by default because it does not refer
 +to a terminal.
 +.Nm
 +is used to force it to be line-buffered so
 +.Xr vmstat 8 Ns 's
 +output will not stall until the full buffer fills.
 +.Bd -literal -offset indent
 +# vmstat 1 | stdbuf -o L awk '$2 > 1 || $3 > 1' | cat -n
 +.Ed
 +.Sh SEE ALSO
 +.Xr libstdbuf 3 ,
 +.Xr setvbuf 3
 +.Sh HISTORY
 +The
 +.Nm
 +utility first appeared in
 +.Fx 8.4 .
 +.Sh AUTHORS
 +.An -nosplit
 +The original idea of the
 +.Nm
 +command comes from 
 +.An Padraig Brady
 +who implemented it in the GNU coreutils.
 +.An Jeremie Le Hen
 +implemented it on
 +.Fx .
 
 Added: head/usr.bin/stdbuf/stdbuf.c
 ==============================================================================
 --- /dev/null	00:00:00 1970	(empty, because file is newly added)
 +++ head/usr.bin/stdbuf/stdbuf.c	Sat Apr 28 20:52:20 2012	(r234772)
 @@ -0,0 +1,104 @@
 +/*-
 + * Copyright (c) 2012 Jeremie Le Hen <jlh@FreeBSD.org>
 + * All rights reserved.
 + *
 + * Redistribution and use in source and binary forms, with or without
 + * modification, are permitted provided that the following conditions
 + * are met:
 + * 1. Redistributions of source code must retain the above copyright
 + *    notice, this list of conditions and the following disclaimer.
 + * 2. Redistributions in binary form must reproduce the above copyright
 + *    notice, this list of conditions and the following disclaimer in the
 + *    documentation and/or other materials provided with the distribution.
 + *
 + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 + * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 + * SUCH DAMAGE.
 + *
 + * $FreeBSD$
 + */
 +
 +#include <err.h>
 +#include <stdio.h>
 +#include <stdlib.h>
 +#include <unistd.h>
 +
 +#define	LIBSTDBUF	"/usr/lib/libstdbuf.so"
 +
 +extern char *__progname;
 +
 +static void
 +usage(int s)
 +{
 +	
 +	fprintf(stderr, "Usage: %s [-e 0|L|<sz>] [-i 0|L|<sz>] [-o 0|L|<sz>] "
 +	    "<cmd> [args ...]\n", __progname);
 +	exit(s);
 +}
 +
 +int
 +main(int argc, char *argv[])
 +{
 +	char *ibuf, *obuf, *ebuf;
 +	char *preload0, *preload1;
 +	int i;
 +
 +	ibuf = obuf = ebuf = NULL;
 +	while ((i = getopt(argc, argv, ":e:i:o:")) != -1) {
 +		switch (i) {
 +		case 'e':
 +			ebuf = optarg;
 +			break;
 +		case 'i':
 +			ibuf = optarg;
 +			break;
 +		case 'o':
 +			obuf = optarg;
 +			break;
 +		case ':':
 +			warnx("Missing argument for option -%c", optopt);
 +			usage(1);
 +			break;
 +		case '?':
 +		default:
 +			warnx("Unknown option: %c", optopt);
 +			usage(1);
 +			break;
 +		}
 +	}
 +	argc -= optind;
 +	argv += optind;
 +	if (argc < 2)
 +		usage(0);
 +
 +	if (ibuf != NULL && setenv("_STDBUF_I", ibuf, 1) == -1)
 +		warn("Failed to set environment variable: %s=%s",
 +		    "_STDBUF_I", ibuf);
 +	if (obuf != NULL && setenv("_STDBUF_O", obuf, 1) == -1)
 +		warn("Failed to set environment variable: %s=%s",
 +		    "_STDBUF_O", obuf);
 +	if (ebuf != NULL && setenv("_STDBUF_E", ebuf, 1) == -1)
 +		warn("Failed to set environment variable: %s=%s",
 +		    "_STDBUF_E", ebuf);
 +
 +	preload0 = getenv("LD_PRELOAD");
 +	if (preload0 == NULL)
 +		i = asprintf(&preload1, "LD_PRELOAD=" LIBSTDBUF);
 +	else
 +		i = asprintf(&preload1, "LD_PRELOAD=%s:%s", preload0,
 +		    LIBSTDBUF);
 +
 +	if (i < 0 || putenv(preload1) == -1)
 +		warn("Failed to set environment variable: %s", preload1);
 +
 +	execvp(argv[0], argv);
 +	err(2, "%s", argv[0]);
 +}
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