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* [musl] [PATCH] add pthread_getname_np function
@ 2021-04-20 19:15 Érico Nogueira
  2021-04-20 19:15 ` [musl] [PATCH v2] define __STDC_UTF_{16,32}__ macros Érico Nogueira
                   ` (5 more replies)
  0 siblings, 6 replies; 11+ messages in thread
From: Érico Nogueira @ 2021-04-20 19:15 UTC (permalink / raw)
  To: musl; +Cc: Érico Rolim

From: Érico Rolim <ericonr@disroot.org>

based on the pthread_setname_np implementation
---

I might have forgotten to send this final version here

 include/pthread.h               |  1 +
 src/thread/pthread_getname_np.c | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 src/thread/pthread_getname_np.c

diff --git a/include/pthread.h b/include/pthread.h
index 0492f26a..89fd9ff7 100644
--- a/include/pthread.h
+++ b/include/pthread.h
@@ -221,6 +221,7 @@ int pthread_getaffinity_np(pthread_t, size_t, struct cpu_set_t *);
 int pthread_setaffinity_np(pthread_t, size_t, const struct cpu_set_t *);
 int pthread_getattr_np(pthread_t, pthread_attr_t *);
 int pthread_setname_np(pthread_t, const char *);
+int pthread_getname_np(pthread_t, char *, size_t);
 int pthread_getattr_default_np(pthread_attr_t *);
 int pthread_setattr_default_np(const pthread_attr_t *);
 int pthread_tryjoin_np(pthread_t, void **);
diff --git a/src/thread/pthread_getname_np.c b/src/thread/pthread_getname_np.c
new file mode 100644
index 00000000..48d1a294
--- /dev/null
+++ b/src/thread/pthread_getname_np.c
@@ -0,0 +1,25 @@
+#define _GNU_SOURCE
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/prctl.h>
+
+#include "pthread_impl.h"
+
+int pthread_getname_np(pthread_t thread, char *name, size_t len)
+{
+	int fd, cs, status = 0;
+	char f[sizeof "/proc/self/task//comm" + 3*sizeof(int)];
+
+	if (len < 16) return ERANGE;
+
+	if (thread == pthread_self())
+		return prctl(PR_GET_NAME, (unsigned long)name, 0UL, 0UL, 0UL) ? errno : 0;
+
+	snprintf(f, sizeof f, "/proc/self/task/%d/comm", thread->tid);
+	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
+	if ((fd = open(f, O_RDONLY|O_CLOEXEC)) < 0 || (len = read(fd, name, len)) < 0) status = errno;
+	else name[len-1] = 0; /* remove trailing new line only if successful */
+	if (fd >= 0) close(fd);
+	pthread_setcancelstate(cs, 0);
+	return status;
+}
-- 
2.31.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [musl] [PATCH v2] define __STDC_UTF_{16,32}__ macros
  2021-04-20 19:15 [musl] [PATCH] add pthread_getname_np function Érico Nogueira
@ 2021-04-20 19:15 ` Érico Nogueira
  2021-04-20 19:15 ` [musl] [PATCH] extend gethostid beyond a stub Érico Nogueira
                   ` (4 subsequent siblings)
  5 siblings, 0 replies; 11+ messages in thread
From: Érico Nogueira @ 2021-04-20 19:15 UTC (permalink / raw)
  To: musl; +Cc: Érico Nogueira

these macros are used to indicate that the implementation uses,
respectively, utf-16 and utf-32 encoding for char16_t and char32_t.
---

don't change features.h to include stdc-predef.h anymore
 include/stdc-predef.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/stdc-predef.h b/include/stdc-predef.h
index f8cd4b89..af1a2799 100644
--- a/include/stdc-predef.h
+++ b/include/stdc-predef.h
@@ -7,4 +7,7 @@
 #define __STDC_IEC_559__ 1
 #endif
 
+#define __STDC_UTF_16__ 1
+#define __STDC_UTF_32__ 1
+
 #endif
-- 
2.31.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [musl] [PATCH] extend gethostid beyond a stub
  2021-04-20 19:15 [musl] [PATCH] add pthread_getname_np function Érico Nogueira
  2021-04-20 19:15 ` [musl] [PATCH v2] define __STDC_UTF_{16,32}__ macros Érico Nogueira
@ 2021-04-20 19:15 ` Érico Nogueira
  2021-04-20 19:15 ` [musl] [PATCH] remove unnecessary cast for map_library return Érico Nogueira
                   ` (3 subsequent siblings)
  5 siblings, 0 replies; 11+ messages in thread
From: Érico Nogueira @ 2021-04-20 19:15 UTC (permalink / raw)
  To: musl; +Cc: Érico Rolim

From: Érico Rolim <erico.erc@gmail.com>

Implement part of the glibc behavior, where the 32-bit identifier stored
in /etc/hostid, if the file exists, is returned. If this file doesn't
contain at least 32 bits or can't be opened for some reason, return 0.
---
 src/misc/gethostid.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/misc/gethostid.c b/src/misc/gethostid.c
index 25bb35db..d529de9c 100644
--- a/src/misc/gethostid.c
+++ b/src/misc/gethostid.c
@@ -1,6 +1,19 @@
 #include <unistd.h>
+#include <stdio.h>
+#include <stdint.h>
 
 long gethostid()
 {
-	return 0;
+	FILE *f;
+	int32_t rv = 0;
+
+	f = fopen("/etc/hostid", "reb");
+	if (f) {
+		if (fread(&rv, sizeof(rv), 1, f) == 0) {
+			rv = 0;
+		}
+		fclose(f);
+	}
+
+	return rv;
 }
-- 
2.31.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [musl] [PATCH] remove unnecessary cast for map_library return
  2021-04-20 19:15 [musl] [PATCH] add pthread_getname_np function Érico Nogueira
  2021-04-20 19:15 ` [musl] [PATCH v2] define __STDC_UTF_{16,32}__ macros Érico Nogueira
  2021-04-20 19:15 ` [musl] [PATCH] extend gethostid beyond a stub Érico Nogueira
@ 2021-04-20 19:15 ` Érico Nogueira
  2021-04-20 19:15 ` [musl] [PATCH] shorten __aeabi_memset by one instruction Érico Nogueira
                   ` (2 subsequent siblings)
  5 siblings, 0 replies; 11+ messages in thread
From: Érico Nogueira @ 2021-04-20 19:15 UTC (permalink / raw)
  To: musl; +Cc: Érico Nogueira

the function already returns (void *)
---
 ldso/dynlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ldso/dynlink.c b/ldso/dynlink.c
index 8b67ef59..5b9c8be4 100644
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -1831,7 +1831,7 @@ void __dls3(size_t *sp, size_t *auxv)
 			dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno));
 			_exit(1);
 		}
-		Ehdr *ehdr = (void *)map_library(fd, &app);
+		Ehdr *ehdr = map_library(fd, &app);
 		if (!ehdr) {
 			dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]);
 			_exit(1);
-- 
2.31.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [musl] [PATCH] shorten __aeabi_memset by one instruction
  2021-04-20 19:15 [musl] [PATCH] add pthread_getname_np function Érico Nogueira
                   ` (2 preceding siblings ...)
  2021-04-20 19:15 ` [musl] [PATCH] remove unnecessary cast for map_library return Érico Nogueira
@ 2021-04-20 19:15 ` Érico Nogueira
  2021-04-21  8:24   ` Szabolcs Nagy
  2021-05-20 13:04 ` [musl] [PATCH] add pthread_getname_np function Stefan Agner
  2021-07-09  8:06 ` Michael Forney
  5 siblings, 1 reply; 11+ messages in thread
From: Érico Nogueira @ 2021-04-20 19:15 UTC (permalink / raw)
  To: musl; +Cc: Érico Nogueira

when building for armhf, this makes libc.so text smaller by 4 bytes:
606619 to 606615
---
 src/string/arm/__aeabi_memset.s | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/string/arm/__aeabi_memset.s b/src/string/arm/__aeabi_memset.s
index f9f60583..980774e8 100644
--- a/src/string/arm/__aeabi_memset.s
+++ b/src/string/arm/__aeabi_memset.s
@@ -24,8 +24,7 @@ __aeabi_memset:
 	cmp   r1, #0
 	beq   2f
 	adds  r1, r0, r1
-1:	strb  r2, [r0]
-	adds  r0, r0, #1
+1:	strb  r2, [r0], #1
 	cmp   r1, r0
 	bne   1b
 2:	bx    lr
-- 
2.31.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* Re: [musl] [PATCH] shorten __aeabi_memset by one instruction
  2021-04-20 19:15 ` [musl] [PATCH] shorten __aeabi_memset by one instruction Érico Nogueira
@ 2021-04-21  8:24   ` Szabolcs Nagy
  2021-04-21 12:32     ` Jesse DeGuire
  2021-04-21 17:38     ` Rich Felker
  0 siblings, 2 replies; 11+ messages in thread
From: Szabolcs Nagy @ 2021-04-21  8:24 UTC (permalink / raw)
  To: Érico Nogueira; +Cc: musl

* Érico Nogueira <ericonr@disroot.org> [2021-04-20 16:15:19 -0300]:
> when building for armhf, this makes libc.so text smaller by 4 bytes:
> 606619 to 606615
> ---
>  src/string/arm/__aeabi_memset.s | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/src/string/arm/__aeabi_memset.s b/src/string/arm/__aeabi_memset.s
> index f9f60583..980774e8 100644
> --- a/src/string/arm/__aeabi_memset.s
> +++ b/src/string/arm/__aeabi_memset.s
> @@ -24,8 +24,7 @@ __aeabi_memset:
>  	cmp   r1, #0
>  	beq   2f
>  	adds  r1, r0, r1
> -1:	strb  r2, [r0]
> -	adds  r0, r0, #1
> +1:	strb  r2, [r0], #1

this is not available before armv7 as thumb instruction (and it
has 32bit thumb encoding, so you replace two 16bit instructions
with a 32bit one.)

normally this asm is compiled in arm mode even if your toolchain
defaults to thumb (i'm not sure why), but if you select a cpu or
arch that only supports thumb then the assembler will try to use
thumb and fail e.g. on -march=armv6-m (but i'm not sure if musl
supports that compilation mode throughout)

>  	cmp   r1, r0
>  	bne   1b
>  2:	bx    lr
> -- 
> 2.31.1

^ permalink raw reply	[flat|nested] 11+ messages in thread

* Re: [musl] [PATCH] shorten __aeabi_memset by one instruction
  2021-04-21  8:24   ` Szabolcs Nagy
@ 2021-04-21 12:32     ` Jesse DeGuire
  2021-04-21 17:38     ` Rich Felker
  1 sibling, 0 replies; 11+ messages in thread
From: Jesse DeGuire @ 2021-04-21 12:32 UTC (permalink / raw)
  To: musl, Érico Nogueira

On Wed, Apr 21, 2021 at 4:25 AM Szabolcs Nagy <nsz@port70.net> wrote:
>
> * Érico Nogueira <ericonr@disroot.org> [2021-04-20 16:15:19 -0300]:
> > when building for armhf, this makes libc.so text smaller by 4 bytes:
> > 606619 to 606615
> > ---
> >  src/string/arm/__aeabi_memset.s | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> >
> > diff --git a/src/string/arm/__aeabi_memset.s b/src/string/arm/__aeabi_memset.s
> > index f9f60583..980774e8 100644
> > --- a/src/string/arm/__aeabi_memset.s
> > +++ b/src/string/arm/__aeabi_memset.s
> > @@ -24,8 +24,7 @@ __aeabi_memset:
> >       cmp   r1, #0
> >       beq   2f
> >       adds  r1, r0, r1
> > -1:   strb  r2, [r0]
> > -     adds  r0, r0, #1
> > +1:   strb  r2, [r0], #1
>
> this is not available before armv7 as thumb instruction (and it
> has 32bit thumb encoding, so you replace two 16bit instructions
> with a 32bit one.)
>
> normally this asm is compiled in arm mode even if your toolchain
> defaults to thumb (i'm not sure why), but if you select a cpu or
> arch that only supports thumb then the assembler will try to use
> thumb and fail e.g. on -march=armv6-m (but i'm not sure if musl
> supports that compilation mode throughout)
>

Musl currently does not build on Thumb1-only devices (Armv6-m and
Armv8-m.base). I submitted a patch some time ago to allow it to build,
though life and other obstacles have made me much too slow in actually
getting a functioning toolchain together to test it properly.

> >       cmp   r1, r0
> >       bne   1b
> >  2:   bx    lr
> > --
> > 2.31.1

^ permalink raw reply	[flat|nested] 11+ messages in thread

* Re: [musl] [PATCH] shorten __aeabi_memset by one instruction
  2021-04-21  8:24   ` Szabolcs Nagy
  2021-04-21 12:32     ` Jesse DeGuire
@ 2021-04-21 17:38     ` Rich Felker
  2021-04-21 19:02       ` Érico Nogueira
  1 sibling, 1 reply; 11+ messages in thread
From: Rich Felker @ 2021-04-21 17:38 UTC (permalink / raw)
  To: Érico Nogueira, musl

On Wed, Apr 21, 2021 at 10:24:58AM +0200, Szabolcs Nagy wrote:
> * Érico Nogueira <ericonr@disroot.org> [2021-04-20 16:15:19 -0300]:
> > when building for armhf, this makes libc.so text smaller by 4 bytes:
> > 606619 to 606615
> > ---
> >  src/string/arm/__aeabi_memset.s | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/src/string/arm/__aeabi_memset.s b/src/string/arm/__aeabi_memset.s
> > index f9f60583..980774e8 100644
> > --- a/src/string/arm/__aeabi_memset.s
> > +++ b/src/string/arm/__aeabi_memset.s
> > @@ -24,8 +24,7 @@ __aeabi_memset:
> >  	cmp   r1, #0
> >  	beq   2f
> >  	adds  r1, r0, r1
> > -1:	strb  r2, [r0]
> > -	adds  r0, r0, #1
> > +1:	strb  r2, [r0], #1
> 
> this is not available before armv7 as thumb instruction (and it
> has 32bit thumb encoding, so you replace two 16bit instructions
> with a 32bit one.)
> 
> normally this asm is compiled in arm mode even if your toolchain
> defaults to thumb (i'm not sure why), but if you select a cpu or
> arch that only supports thumb then the assembler will try to use
> thumb and fail e.g. on -march=armv6-m (but i'm not sure if musl
> supports that compilation mode throughout)

Should we hold off on doing anything about this for now then? I'd
rather avoid making more work for future, and this is pure *junk* code
that we do not expect to be called from anywhere (it's extremely slow)
and only there to satisfy broken tooling generating calls to it rather
than to the standard functions.

Rich

^ permalink raw reply	[flat|nested] 11+ messages in thread

* Re: [musl] [PATCH] shorten __aeabi_memset by one instruction
  2021-04-21 17:38     ` Rich Felker
@ 2021-04-21 19:02       ` Érico Nogueira
  0 siblings, 0 replies; 11+ messages in thread
From: Érico Nogueira @ 2021-04-21 19:02 UTC (permalink / raw)
  To: musl

Em 21/04/2021 14:38, Rich Felker escreveu:
> On Wed, Apr 21, 2021 at 10:24:58AM +0200, Szabolcs Nagy wrote:
>> * Érico Nogueira <ericonr@disroot.org> [2021-04-20 16:15:19 -0300]:
>>> when building for armhf, this makes libc.so text smaller by 4 bytes:
>>> 606619 to 606615
>>> ---
>>>   src/string/arm/__aeabi_memset.s | 3 +--
>>>   1 file changed, 1 insertion(+), 2 deletions(-)
>>>
>>> diff --git a/src/string/arm/__aeabi_memset.s b/src/string/arm/__aeabi_memset.s
>>> index f9f60583..980774e8 100644
>>> --- a/src/string/arm/__aeabi_memset.s
>>> +++ b/src/string/arm/__aeabi_memset.s
>>> @@ -24,8 +24,7 @@ __aeabi_memset:
>>>   	cmp   r1, #0
>>>   	beq   2f
>>>   	adds  r1, r0, r1
>>> -1:	strb  r2, [r0]
>>> -	adds  r0, r0, #1
>>> +1:	strb  r2, [r0], #1
>>
>> this is not available before armv7 as thumb instruction (and it
>> has 32bit thumb encoding, so you replace two 16bit instructions
>> with a 32bit one.)
>>
>> normally this asm is compiled in arm mode even if your toolchain
>> defaults to thumb (i'm not sure why), but if you select a cpu or
>> arch that only supports thumb then the assembler will try to use
>> thumb and fail e.g. on -march=armv6-m (but i'm not sure if musl
>> supports that compilation mode throughout)
> 
> Should we hold off on doing anything about this for now then? I'd
> rather avoid making more work for future, and this is pure *junk* code
> that we do not expect to be called from anywhere (it's extremely slow)
> and only there to satisfy broken tooling generating calls to it rather
> than to the standard functions.

That's ok for me. I was just browsing this file for some reason and 
noted the potential to "simplify" it.

That said, src/string/arm/memcpy.S also uses this addressing mode, so it 
is probably relevant to watch out for it for an eventual port:

	/* align source to 32 bits. We need to insert 2 instructions between
	 * a ldr[b|h] and str[b|h] because byte and half-word instructions
	 * stall 2 cycles.
	 */
	movs    r12, r3, lsl #31
	sub     r2, r2, r3              /* we know that r3 <= r2 because r2 >= 4 */
	ldrbmi r3, [r1], #1
	ldrbcs r4, [r1], #1
	ldrbcs r12,[r1], #1
	strbmi r3, [r0], #1
	strbcs r4, [r0], #1
	strbcs r12,[r0], #1


> 
> Rich

^ permalink raw reply	[flat|nested] 11+ messages in thread

* Re: [musl] [PATCH] add pthread_getname_np function
  2021-04-20 19:15 [musl] [PATCH] add pthread_getname_np function Érico Nogueira
                   ` (3 preceding siblings ...)
  2021-04-20 19:15 ` [musl] [PATCH] shorten __aeabi_memset by one instruction Érico Nogueira
@ 2021-05-20 13:04 ` Stefan Agner
  2021-07-09  8:06 ` Michael Forney
  5 siblings, 0 replies; 11+ messages in thread
From: Stefan Agner @ 2021-05-20 13:04 UTC (permalink / raw)
  To: musl; +Cc: Érico Rolim

Hi,

On 2021-04-20 21:15, Érico Nogueira wrote:
> From: Érico Rolim <ericonr@disroot.org>
> 
> based on the pthread_setname_np implementation
> ---
> 
> I might have forgotten to send this final version here
> 
>  include/pthread.h               |  1 +
>  src/thread/pthread_getname_np.c | 25 +++++++++++++++++++++++++
>  2 files changed, 26 insertions(+)
>  create mode 100644 src/thread/pthread_getname_np.c
> 
> diff --git a/include/pthread.h b/include/pthread.h
> index 0492f26a..89fd9ff7 100644
> --- a/include/pthread.h
> +++ b/include/pthread.h
> @@ -221,6 +221,7 @@ int pthread_getaffinity_np(pthread_t, size_t,
> struct cpu_set_t *);
>  int pthread_setaffinity_np(pthread_t, size_t, const struct cpu_set_t *);
>  int pthread_getattr_np(pthread_t, pthread_attr_t *);
>  int pthread_setname_np(pthread_t, const char *);
> +int pthread_getname_np(pthread_t, char *, size_t);
>  int pthread_getattr_default_np(pthread_attr_t *);
>  int pthread_setattr_default_np(const pthread_attr_t *);
>  int pthread_tryjoin_np(pthread_t, void **);
> diff --git a/src/thread/pthread_getname_np.c b/src/thread/pthread_getname_np.c
> new file mode 100644
> index 00000000..48d1a294
> --- /dev/null
> +++ b/src/thread/pthread_getname_np.c
> @@ -0,0 +1,25 @@
> +#define _GNU_SOURCE
> +#include <fcntl.h>
> +#include <unistd.h>
> +#include <sys/prctl.h>
> +
> +#include "pthread_impl.h"
> +
> +int pthread_getname_np(pthread_t thread, char *name, size_t len)
> +{
> +	int fd, cs, status = 0;
> +	char f[sizeof "/proc/self/task//comm" + 3*sizeof(int)];
> +
> +	if (len < 16) return ERANGE;
> +
> +	if (thread == pthread_self())
> +		return prctl(PR_GET_NAME, (unsigned long)name, 0UL, 0UL, 0UL) ? errno : 0;
> +
> +	snprintf(f, sizeof f, "/proc/self/task/%d/comm", thread->tid);
> +	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
> +	if ((fd = open(f, O_RDONLY|O_CLOEXEC)) < 0 || (len = read(fd, name,
> len)) < 0) status = errno;
> +	else name[len-1] = 0; /* remove trailing new line only if successful */

It seems that Linux indeed always adds a newline, so removing it
unconditionally seems fine.

> +	if (fd >= 0) close(fd);
> +	pthread_setcancelstate(cs, 0);
> +	return status;
> +}

Looks good to me:
Reviewed-by: Stefan Agner <stefan@agner.ch>

FWIW, We carry basically the same patch for musl to build TensorFlow and
I was about to post it.

--
Stefan

^ permalink raw reply	[flat|nested] 11+ messages in thread

* Re: [musl] [PATCH] add pthread_getname_np function
  2021-04-20 19:15 [musl] [PATCH] add pthread_getname_np function Érico Nogueira
                   ` (4 preceding siblings ...)
  2021-05-20 13:04 ` [musl] [PATCH] add pthread_getname_np function Stefan Agner
@ 2021-07-09  8:06 ` Michael Forney
  5 siblings, 0 replies; 11+ messages in thread
From: Michael Forney @ 2021-07-09  8:06 UTC (permalink / raw)
  To: musl; +Cc: Érico Nogueira

On 2021-04-20, Érico Nogueira <ericonr@disroot.org> wrote:
> +	if ((fd = open(f, O_RDONLY|O_CLOEXEC)) < 0 || (len = read(fd, name, len)) < 0) status = errno;

This read error check isn't quite right. len has type size_t (which is
unsigned), so (len = ...) < 0 is always false. I think you probably
need to use a separate variable here.

^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2021-07-09  8:07 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-04-20 19:15 [musl] [PATCH] add pthread_getname_np function Érico Nogueira
2021-04-20 19:15 ` [musl] [PATCH v2] define __STDC_UTF_{16,32}__ macros Érico Nogueira
2021-04-20 19:15 ` [musl] [PATCH] extend gethostid beyond a stub Érico Nogueira
2021-04-20 19:15 ` [musl] [PATCH] remove unnecessary cast for map_library return Érico Nogueira
2021-04-20 19:15 ` [musl] [PATCH] shorten __aeabi_memset by one instruction Érico Nogueira
2021-04-21  8:24   ` Szabolcs Nagy
2021-04-21 12:32     ` Jesse DeGuire
2021-04-21 17:38     ` Rich Felker
2021-04-21 19:02       ` Érico Nogueira
2021-05-20 13:04 ` [musl] [PATCH] add pthread_getname_np function Stefan Agner
2021-07-09  8:06 ` Michael Forney

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