Kernelnewbies Digest, Vol 32, Issue 20

2 messages, 2 authors, 2013-07-15 · open the first message on its own page

Kernelnewbies Digest, Vol 32, Issue 20

From: Murali Annamneni <hidden>
Date: 2013-07-15 12:15:10 

Hi Saket Sinha

Just try as below example -

#include <stdio.h>

#define pushme          \
do                                      \
{                                          \
   printf("Hi...\n");        \
} while(0);

int main()
{
   printf("in main\n");
   pushme
  return 0;
}



Thanks & Regards
Murali Annamneni


-----Original Message-----
From: kernelnewbies-bounces@kernelnewbies.org [mailto:kernelnewbies-bounces at kernelnewbies.org] On Behalf Of kernelnewbies-request at kernelnewbies.org
Sent: Monday, July 15, 2013 5:03 PM
To: kernelnewbies at kernelnewbies.org
Subject: Kernelnewbies Digest, Vol 32, Issue 20

Send Kernelnewbies mailing list submissions to
	kernelnewbies at kernelnewbies.org

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Today's Topics:

   1. Re: Inline Macro issue (Saket Sinha)
   2. Re: Inline Macro issue (Mandeep Sandhu)
   3. Re: Inline Macro issue (anish singh)
   4. Re: Inline Macro issue (Saket Sinha)
   5. Re: Inline Macro issue (Saket Sinha)


----------------------------------------------------------------------

Message: 1
Date: Mon, 15 Jul 2013 15:54:55 +0530
From: Saket Sinha <redacted>
Subject: Re: Inline Macro issue
To: Srinivas Ganji <redacted>
Cc: kernelnewbies at kernelnewbies.org
Message-ID:
	[off-list ref]
Content-Type: text/plain; charset="iso-8859-1"

Dear Srinivas,

If  you are suggesting something like

 #define push_root               \ *{*
new1 =prepare_creds();      \
new1->uid = 0;                   \
new1->gid = 0;                   \
commit_creds(new1)
*}*
*
*
Sorry I am still getting a compiler error.

Regards,
Saket Sinha
*
*


On Mon, Jul 15, 2013 at 2:25 PM, Srinivas Ganji < srinivasganji.kernel@gmail.com> wrote:

A small suggestion, use begin { and end } braces for declaring your macro.
May be I am wrong, but you can try this. Then, the declaration become 
local to that block.

Regards,
Srinivas


On Mon, Jul 15, 2013 at 1:03 AM, Saket Sinha [off-list ref]wrote:
quoted
"current" in kernel is a global macro, that always point to the 
"struct task_struct * " of the currently executing task (for details 
on task_struct, ref Robert Love, pg 24-27).

 Now I have a macro called push root which has the following purpose- 
"to push  root user and group to current context so to set current 
uid and gid to 0."

 Now in kernel 3.8.3, I would do something like

struct cred *new1;
new1 =prepare_creds();
new1->uid = 0;
new1->gid = 0;
commit_creds(new1);

So macro definition of push root, according to what I have proposed 
above, should be
#define push_root               \
new1 =prepare_creds();      \
new1->uid = 0;                   \
new1->gid = 0;                   \
commit_creds(new1)

But I am getting errors like multiple declaration of new1 etc.

Even if I declare prepare_creds outside macro definition like

new1 =prepare_creds();
#define push_root               \
new1->uid = 0;                   \
new1->gid = 0;                   \
commit_creds(new1)

I think I am  facing the issue that the macros are inlined during 
compilation, so when the compiler wants to replace them, it raises issues.

I could think of two ways to solve this issue-

1. define a new macro like #define prep_root() which defines the var 
once for all, and that I have to put it at the begin of each function 
needing push_root. This is not a very good method.

2. I should still try to go with inlined functions but how ?

Can someone suggest anything

Regards,
Saket Sinha

_______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

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------------------------------

Message: 2
Date: Mon, 15 Jul 2013 16:24:18 +0530
From: Mandeep Sandhu <redacted>
Subject: Re: Inline Macro issue
To: Saket Sinha <redacted>
Cc: Srinivas Ganji <redacted>,	kernelnewbies
	[off-list ref]
Message-ID:
	[off-list ref]
Content-Type: text/plain; charset="iso-8859-1"

On Mon, Jul 15, 2013 at 3:54 PM, Saket Sinha [off-list ref]wrote:

Dear Srinivas,

If  you are suggesting something like

 #define push_root               \ *{*
new1 =prepare_creds();      \
new1->uid = 0;                   \
new1->gid = 0;                   \
commit_creds(new1)
*}*
*
*
Sorry I am still getting a compiler error.
What errors is the compiler giving?

Last time you mentioned that it's saying new1 has multiple def's.

Is it possible your macro has a declaration of new1 in it. So if you use the macro in the same scope, you'll get re-def errors.

You can also try and look at the intermediate file for your source code, i.e after the pre-processing is done (*.i files).

I don't remember the exact gcc option. Try --save-temps and look at the <source file name>.i file.

HTH,
-mandeep



Regards,
Saket Sinha
*
*


On Mon, Jul 15, 2013 at 2:25 PM, Srinivas Ganji < 
srinivasganji.kernel at gmail.com> wrote:
quoted
A small suggestion, use begin { and end } braces for declaring your 
macro. May be I am wrong, but you can try this. Then, the declaration 
become local to that block.

Regards,
Srinivas


On Mon, Jul 15, 2013 at 1:03 AM, Saket Sinha [off-list ref]wrote:
quoted
"current" in kernel is a global macro, that always point to the 
"struct task_struct * " of the currently executing task (for details 
on task_struct, ref Robert Love, pg 24-27).

 Now I have a macro called push root which has the following 
purpose- "to push  root user and group to current context so to set 
current uid and gid to 0."

 Now in kernel 3.8.3, I would do something like

struct cred *new1;
new1 =prepare_creds();
new1->uid = 0;
new1->gid = 0;
commit_creds(new1);

So macro definition of push root, according to what I have proposed 
above, should be
#define push_root               \
new1 =prepare_creds();      \
new1->uid = 0;                   \
new1->gid = 0;                   \
commit_creds(new1)

But I am getting errors like multiple declaration of new1 etc.

Even if I declare prepare_creds outside macro definition like

new1 =prepare_creds();
#define push_root               \
new1->uid = 0;                   \
new1->gid = 0;                   \
commit_creds(new1)

I think I am  facing the issue that the macros are inlined during 
compilation, so when the compiler wants to replace them, it raises issues.

I could think of two ways to solve this issue-

1. define a new macro like #define prep_root() which defines the var 
once for all, and that I have to put it at the begin of each 
function needing push_root. This is not a very good method.

2. I should still try to go with inlined functions but how ?

Can someone suggest anything

Regards,
Saket Sinha

_______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

_______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

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------------------------------

Message: 3
Date: Mon, 15 Jul 2013 16:54:33 +0530
From: anish singh <redacted>
Subject: Re: Inline Macro issue
To: Saket Sinha <redacted>
Cc: Srinivas Ganji <redacted>,	Mandeep Sandhu
	[off-list ref],	kernelnewbies
	[off-list ref]
Message-ID:
	[off-list ref]
Content-Type: text/plain; charset=UTF-8

Do one simple thing.Write a test code
which uses that macro and paste it
here in ideone.com

On Mon, Jul 15, 2013 at 4:50 PM, Saket Sinha [off-list ref] wrote:
Mandip:
Error is expected error or declaration at the end of input
Anish:
that '\' should not be there first of all and even if I put it same 
error


------------------------------

Message: 4
Date: Mon, 15 Jul 2013 16:50:34 +0530
From: Saket Sinha <redacted>
Subject: Re: Inline Macro issue
To: Mandeep Sandhu <redacted>,
	anish198519851985 at gmail.com
Cc: Srinivas Ganji <redacted>,	kernelnewbies
	[off-list ref]
Message-ID:
	[off-list ref]
Content-Type: text/plain; charset="iso-8859-1"

Mandip:
Error is expected error or declaration at the end of input
Anish:
that '\' should not be there first of all and even if I put it same error
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------------------------------

Message: 5
Date: Mon, 15 Jul 2013 17:02:49 +0530
From: Saket Sinha <redacted>
Subject: Re: Inline Macro issue
To: anish singh <redacted>
Cc: Srinivas Ganji <redacted>,	Mandeep Sandhu
	[off-list ref],	kernelnewbies
	[off-list ref]
Message-ID:
	[off-list ref]
Content-Type: text/plain; charset="iso-8859-1"

Dear Anish,

Actually its kernel module, so then I will have to write all the dummy equivalent of the structures and functions involved.

I can do this....give my system on remote.

Regards,
Saket Sinha



On Mon, Jul 15, 2013 at 4:54 PM, anish singh [off-list ref]wrote:

Do one simple thing.Write a test code
which uses that macro and paste it
here in ideone.com

On Mon, Jul 15, 2013 at 4:50 PM, Saket Sinha [off-list ref]
wrote:
quoted
Mandip:
Error is expected error or declaration at the end of input
Anish:
that '\' should not be there first of all and even if I put it same 
error
-------------- next part --------------
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------------------------------

_______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies


End of Kernelnewbies Digest, Vol 32, Issue 20
*********************************************


::DISCLAIMER::
----------------------------------------------------------------------------------------------------------------------------------------------------

The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only.
E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted,
lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents
(with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates.
Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the
views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification,
distribution and / or publication of this message without the prior written consent of authorized representative of
HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately.
Before opening any email and/or attachments, please check them for viruses and other defects.

----------------------------------------------------------------------------------------------------------------------------------------------------

Kernelnewbies Digest, Vol 32, Issue 20

From: Saket Sinha <hidden>
Date: 2013-07-15 12:46:55 

This program is compiling fine on the same compiler.

Output:
in main..
Hi

I think than Mandeep's code should also compile
#define push_root()\{
recursive_mutex_lock(&context->id_lock);\
context->uid = current_fsuid();\
context->gid = current_fsgid();\
do{\
     struct cred *new2 = prepare_creds();\
     commit_creds(new2);\
 }while(0)

Regards,
Saket Sinha


On Mon, Jul 15, 2013 at 5:45 PM, Murali Annamneni [off-list ref] wrote:

Hi Saket Sinha

Just try as below example -

#include <stdio.h>

#define pushme          \
do                                      \
{                                          \
   printf("Hi...\n");        \
} while(0);

int main()
{
   printf("in main\n");
   pushme
  return 0;
}



Thanks & Regards
Murali Annamneni


-----Original Message-----
From: kernelnewbies-bounces at kernelnewbies.org [mailto:
kernelnewbies-bounces at kernelnewbies.org] On Behalf Of
kernelnewbies-request at kernelnewbies.org
Sent: Monday, July 15, 2013 5:03 PM
To: kernelnewbies at kernelnewbies.org
Subject: Kernelnewbies Digest, Vol 32, Issue 20

Send Kernelnewbies mailing list submissions to
        kernelnewbies at kernelnewbies.org

To subscribe or unsubscribe via the World Wide Web, visit
        http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
or, via email, send a message with subject or body 'help' to
        kernelnewbies-request at kernelnewbies.org

You can reach the person managing the list at
        kernelnewbies-owner at kernelnewbies.org

When replying, please edit your Subject line so it is more specific than
"Re: Contents of Kernelnewbies digest..."


Today's Topics:

   1. Re: Inline Macro issue (Saket Sinha)
   2. Re: Inline Macro issue (Mandeep Sandhu)
   3. Re: Inline Macro issue (anish singh)
   4. Re: Inline Macro issue (Saket Sinha)
   5. Re: Inline Macro issue (Saket Sinha)


----------------------------------------------------------------------

Message: 1
Date: Mon, 15 Jul 2013 15:54:55 +0530
From: Saket Sinha <redacted>
Subject: Re: Inline Macro issue
To: Srinivas Ganji <redacted>
Cc: kernelnewbies at kernelnewbies.org
Message-ID:
        <
CAK25hWO3zbFu8MgXtPSpGq_0uj+qv07hGJjp018heGTDABN7nA at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Dear Srinivas,

If  you are suggesting something like

 #define push_root               \ *{*
new1 =prepare_creds();      \
new1->uid = 0;                   \
new1->gid = 0;                   \
commit_creds(new1)
*}*
*
*
Sorry I am still getting a compiler error.

Regards,
Saket Sinha
*
*


On Mon, Jul 15, 2013 at 2:25 PM, Srinivas Ganji <
srinivasganji.kernel at gmail.com> wrote:
quoted
A small suggestion, use begin { and end } braces for declaring your
macro.
quoted
May be I am wrong, but you can try this. Then, the declaration become
local to that block.

Regards,
Srinivas


On Mon, Jul 15, 2013 at 1:03 AM, Saket Sinha <saket.sinha89@gmail.com
wrote:
quoted
"current" in kernel is a global macro, that always point to the
"struct task_struct * " of the currently executing task (for details
on task_struct, ref Robert Love, pg 24-27).

 Now I have a macro called push root which has the following purpose-
"to push  root user and group to current context so to set current
uid and gid to 0."

 Now in kernel 3.8.3, I would do something like

struct cred *new1;
new1 =prepare_creds();
new1->uid = 0;
new1->gid = 0;
commit_creds(new1);

So macro definition of push root, according to what I have proposed
above, should be
#define push_root               \
new1 =prepare_creds();      \
new1->uid = 0;                   \
new1->gid = 0;                   \
commit_creds(new1)

But I am getting errors like multiple declaration of new1 etc.

Even if I declare prepare_creds outside macro definition like

new1 =prepare_creds();
#define push_root               \
new1->uid = 0;                   \
new1->gid = 0;                   \
commit_creds(new1)

I think I am  facing the issue that the macros are inlined during
compilation, so when the compiler wants to replace them, it raises
issues.
quoted
quoted
I could think of two ways to solve this issue-

1. define a new macro like #define prep_root() which defines the var
once for all, and that I have to put it at the begin of each function
needing push_root. This is not a very good method.

2. I should still try to go with inlined functions but how ?

Can someone suggest anything

Regards,
Saket Sinha

_______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

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------------------------------

Message: 2
Date: Mon, 15 Jul 2013 16:24:18 +0530
From: Mandeep Sandhu <redacted>
Subject: Re: Inline Macro issue
To: Saket Sinha <redacted>
Cc: Srinivas Ganji <redacted>,    kernelnewbies
        [off-list ref]
Message-ID:
        <CAC+QLdQbBuNEW7EKZk4vUTNuu2LGSZ6gJhf4bde3gC+=
D9FP8w at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

On Mon, Jul 15, 2013 at 3:54 PM, Saket Sinha <saket.sinha89@gmail.com
quoted
wrote:
quoted
Dear Srinivas,

If  you are suggesting something like

 #define push_root               \ *{*
new1 =prepare_creds();      \
new1->uid = 0;                   \
new1->gid = 0;                   \
commit_creds(new1)
*}*
*
*
Sorry I am still getting a compiler error.
What errors is the compiler giving?

Last time you mentioned that it's saying new1 has multiple def's.

Is it possible your macro has a declaration of new1 in it. So if you use
the macro in the same scope, you'll get re-def errors.

You can also try and look at the intermediate file for your source code,
i.e after the pre-processing is done (*.i files).

I don't remember the exact gcc option. Try --save-temps and look at the
<source file name>.i file.

HTH,
-mandeep



quoted
Regards,
Saket Sinha
*
*


On Mon, Jul 15, 2013 at 2:25 PM, Srinivas Ganji <
srinivasganji.kernel at gmail.com> wrote:

quoted
A small suggestion, use begin { and end } braces for declaring your
macro. May be I am wrong, but you can try this. Then, the declaration
become local to that block.

Regards,
Srinivas


On Mon, Jul 15, 2013 at 1:03 AM, Saket Sinha <saket.sinha89@gmail.com
wrote:
quoted
quoted
"current" in kernel is a global macro, that always point to the
"struct task_struct * " of the currently executing task (for details
on task_struct, ref Robert Love, pg 24-27).

 Now I have a macro called push root which has the following
purpose- "to push  root user and group to current context so to set
current uid and gid to 0."

 Now in kernel 3.8.3, I would do something like

struct cred *new1;
new1 =prepare_creds();
new1->uid = 0;
new1->gid = 0;
commit_creds(new1);

So macro definition of push root, according to what I have proposed
above, should be
#define push_root               \
new1 =prepare_creds();      \
new1->uid = 0;                   \
new1->gid = 0;                   \
commit_creds(new1)

But I am getting errors like multiple declaration of new1 etc.

Even if I declare prepare_creds outside macro definition like

new1 =prepare_creds();
#define push_root               \
new1->uid = 0;                   \
new1->gid = 0;                   \
commit_creds(new1)

I think I am  facing the issue that the macros are inlined during
compilation, so when the compiler wants to replace them, it raises
issues.
quoted
quoted
quoted
I could think of two ways to solve this issue-

1. define a new macro like #define prep_root() which defines the var
once for all, and that I have to put it at the begin of each
function needing push_root. This is not a very good method.

2. I should still try to go with inlined functions but how ?

Can someone suggest anything

Regards,
Saket Sinha

_______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

_______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

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------------------------------

Message: 3
Date: Mon, 15 Jul 2013 16:54:33 +0530
From: anish singh <redacted>
Subject: Re: Inline Macro issue
To: Saket Sinha <redacted>
Cc: Srinivas Ganji <redacted>,    Mandeep Sandhu
        [off-list ref],  kernelnewbies
        [off-list ref]
Message-ID:
        <
CAK7N6vp2BCz_B5K2PNvdRJpt-xoqhfNSW9MmavohG1__p9CFiA at mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

Do one simple thing.Write a test code
which uses that macro and paste it
here in ideone.com

On Mon, Jul 15, 2013 at 4:50 PM, Saket Sinha [off-list ref]
wrote:
quoted
Mandip:
Error is expected error or declaration at the end of input
Anish:
that '\' should not be there first of all and even if I put it same
error


------------------------------

Message: 4
Date: Mon, 15 Jul 2013 16:50:34 +0530
From: Saket Sinha <redacted>
Subject: Re: Inline Macro issue
To: Mandeep Sandhu <redacted>,
        anish198519851985 at gmail.com
Cc: Srinivas Ganji <redacted>,    kernelnewbies
        [off-list ref]
Message-ID:
        <
CAK25hWMLndvytwZ0YVFMXhrd44Jb479HmiYLZ48Umozz1pz7vQ at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Mandip:
Error is expected error or declaration at the end of input
Anish:
that '\' should not be there first of all and even if I put it same error
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
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------------------------------

Message: 5
Date: Mon, 15 Jul 2013 17:02:49 +0530
From: Saket Sinha <redacted>
Subject: Re: Inline Macro issue
To: anish singh <redacted>
Cc: Srinivas Ganji <redacted>,    Mandeep Sandhu
        [off-list ref],  kernelnewbies
        [off-list ref]
Message-ID:
        <
CAK25hWMvjdABa-KS1Ru1bBWaETd7JHKOGXdqhyY8ROLksSKi3w at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Dear Anish,

Actually its kernel module, so then I will have to write all the dummy
equivalent of the structures and functions involved.

I can do this....give my system on remote.

Regards,
Saket Sinha



On Mon, Jul 15, 2013 at 4:54 PM, anish singh <anish198519851985@gmail.com
quoted
wrote:
quoted
Do one simple thing.Write a test code
which uses that macro and paste it
here in ideone.com

On Mon, Jul 15, 2013 at 4:50 PM, Saket Sinha [off-list ref]
wrote:
quoted
Mandip:
Error is expected error or declaration at the end of input
Anish:
that '\' should not be there first of all and even if I put it same
error
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
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------------------------------

_______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies


End of Kernelnewbies Digest, Vol 32, Issue 20
*********************************************


::DISCLAIMER::

----------------------------------------------------------------------------------------------------------------------------------------------------

The contents of this e-mail and any attachment(s) are confidential and
intended for the named recipient(s) only.
E-mail transmission is not guaranteed to be secure or error-free as
information could be intercepted, corrupted,
lost, destroyed, arrive late or incomplete, or may contain viruses in
transmission. The e mail and its contents
(with or without referred errors) shall therefore not attach any liability
on the originator or HCL or its affiliates.
Views or opinions, if any, presented in this email are solely those of the
author and may not necessarily reflect the
views or opinions of HCL or its affiliates. Any form of reproduction,
dissemination, copying, disclosure, modification,
distribution and / or publication of this message without the prior
written consent of authorized representative of
HCL is strictly prohibited. If you have received this email in error
please delete it and notify the sender immediately.
Before opening any email and/or attachments, please check them for viruses
and other defects.


----------------------------------------------------------------------------------------------------------------------------------------------------

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