[PATCH] prctl.2: Correct description of null-termination in PR_[GS]ET_NAME

[PATCH] prctl.2: Correct description of null-termination in PR_[GS]ET_NAME

[Andreas Schwab]

The size of the process name has always been at most 16 byte _including_
the null terminator.  This also means that the name returned by
PR_GET_NAME is always null-terminated.

Signed-off-by: Andreas Schwab <schwab-l3A5Bk7waGM@public.gmane.org>
---
 man2/prctl.2 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/man2/prctl.2 b/man2/prctl.2
index 1199891..4351ff9 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2
@@ -240,7 +240,7 @@ using the value in the location pointed to by
 .IR "(char\ *) arg2" .
 The name can be up to 16 bytes long,
 .\" TASK_COMM_LEN in include/linux/sched.h
-and should be null-terminated if it contains fewer bytes.
+including the terminating null byte.
 This is the same attribute that can be set via
 .BR pthread_setname_np (3)
 and retrieved using
@@ -256,7 +256,7 @@ Return the name of the calling thread,
 in the buffer pointed to by
 .IR "(char\ *) arg2" .
 The buffer should allow space for up to 16 bytes;
-the returned string will be null-terminated if it is shorter than that.
+the returned string will be null-terminated.
 .TP
 .BR PR_SET_NO_NEW_PRIVS " (since Linux 3.5)"
 Set the calling process's
-- 
2.1.2


-- 
Andreas Schwab, SUSE Labs, schwab-l3A5Bk7waGM@public.gmane.org
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"And now for something completely different."
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[PATCH] prctl.2: Correct description of null-termination in PR_[GS]ET_NAME

[Andreas Schwab]

The size of the process name has always been at most 16 byte _including_
the null terminator.  This also means that the name returned by
PR_GET_NAME is always null-terminated.

Signed-off-by: Andreas Schwab <schwab-l3A5Bk7waGM@public.gmane.org>
---
 man2/prctl.2 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/man2/prctl.2 b/man2/prctl.2
index 1199891..4351ff9 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2
@@ -240,7 +240,7 @@ using the value in the location pointed to by
 .IR "(char\ *) arg2" .
 The name can be up to 16 bytes long,
 .\" TASK_COMM_LEN in include/linux/sched.h
-and should be null-terminated if it contains fewer bytes.
+including the terminating null byte.
 This is the same attribute that can be set via
 .BR pthread_setname_np (3)
 and retrieved using
@@ -256,7 +256,7 @@ Return the name of the calling thread,
 in the buffer pointed to by
 .IR "(char\ *) arg2" .
 The buffer should allow space for up to 16 bytes;
-the returned string will be null-terminated if it is shorter than that.
+the returned string will be null-terminated.
 .TP
 .BR PR_SET_NO_NEW_PRIVS " (since Linux 3.5)"
 Set the calling process's
-- 
2.1.2

-- 
Andreas Schwab, SUSE Labs, schwab-l3A5Bk7waGM@public.gmane.org
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
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Re: [PATCH] prctl.2: Correct description of null-termination in PR_[GS]ET_NAME

[Michael Kerrisk (man-pages)]

Hello Andreas,

On 10/21/2014 12:58 PM, Andreas Schwab wrote:
> The size of the process name has always been at most 16 byte _including_
> the null terminator.  This also means that the name returned by
> PR_GET_NAME is always null-terminated.

Thanks. I applied this. One comment below.


> Signed-off-by: Andreas Schwab <schwab-l3A5Bk7waGM@public.gmane.org>
> ---
>  man2/prctl.2 | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/man2/prctl.2 b/man2/prctl.2
> index 1199891..4351ff9 100644
> --- a/man2/prctl.2
> +++ b/man2/prctl.2
> @@ -240,7 +240,7 @@ using the value in the location pointed to by
>  .IR "(char\ *) arg2" .
>  The name can be up to 16 bytes long,
>  .\" TASK_COMM_LEN in include/linux/sched.h
> -and should be null-terminated if it contains fewer bytes.
> +including the terminating null byte.

I added here:

  (If the length of the string, including the terminating null byte,
  exceeds 16 bytes, the string is silently truncated.)

Okay?

Cheers,

Michael


>  This is the same attribute that can be set via
>  .BR pthread_setname_np (3)
>  and retrieved using
> @@ -256,7 +256,7 @@ Return the name of the calling thread,
>  in the buffer pointed to by
>  .IR "(char\ *) arg2" .
>  The buffer should allow space for up to 16 bytes;
> -the returned string will be null-terminated if it is shorter than that.
> +the returned string will be null-terminated.
>  .TP
>  .BR PR_SET_NO_NEW_PRIVS " (since Linux 3.5)"
>  Set the calling process's
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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Re: [PATCH] prctl.2: Correct description of null-termination in PR_[GS]ET_NAME

[Andreas Schwab]

"Michael Kerrisk (man-pages)" <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> I added here:
>
>   (If the length of the string, including the terminating null byte,
>   exceeds 16 bytes, the string is silently truncated.)
>
> Okay?

Ok.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab-l3A5Bk7waGM@public.gmane.org
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
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Re: [PATCH] prctl.2: Correct description of null-termination in PR_[GS]ET_NAME

[Michael Kerrisk (man-pages)]

On Tue, Oct 28, 2014 at 3:05 PM, Andreas Schwab <schwab-l3A5Bk7waGM@public.gmane.org> wrote:
> "Michael Kerrisk (man-pages)" <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
>> I added here:
>>
>>   (If the length of the string, including the terminating null byte,
>>   exceeds 16 bytes, the string is silently truncated.)
>>
>> Okay?
>
> Ok.


Thanks for the confirmation, Andreas.

Cheers,

Michael
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