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attribute in C programing

Tue, 27 Mar 2001 05:23:45 -0700

Does anybody know what the __attribute__ in certain .c and .h files in Linux means?
Know where I can get additional info?

Thanks,
Deepak

Re: attribute in C programing

Tue, 27 Mar 2001 10:02:37 -0700

I have never seen __attribute__ in a c or .h file, is this in a program ? or is this in the standard gcc header files ? If its in a program, look into the code, and check.

: Does anybody know what the __attribute__ in certain .c and .h files in Linux means?
: Know where I can get additional info?
:
: Thanks,
: Deepak
:

Re: attribute in C programing

Tue, 27 Mar 2001 21:37:14 -0700

: I have never seen __attribute__ in a c or .h file, is this in a program ? or is this in the standard gcc header files ? If its in a program, look into the code, and check.
:
: : Does anybody know what the __attribute__ in certain .c and .h files in Linux means?
: : Know where I can get additional info?
: :
: : Thanks,
: : Deepak
: :
:
:

Do a grep for __attribute__ in the source files of Linux components.

D

Re: attribute in C programing

Wed, 28 Mar 2001 06:38:06 -0700

: : I have never seen __attribute__ in a c or .h file, is this in a program ? or is this in the standard gcc header files ? If its in a program, look into the code, and check.
: :
: : : Does anybody know what the __attribute__ in certain .c and .h files in Linux means?
: : : Know where I can get additional info?
: : :
: : : Thanks,
: : : Deepak
: : :
: :
: :
:
: Do a grep for __attribute__ in the source files of Linux components.
:
: D
:
:

Check out http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_4.html#SEC84

D

Re: attribute in C programing

Wed, 28 Mar 2001 09:23:05 -0700

Thank you,

Actually I was searching for this sort of stuff for my code in C, and was wondering what the option was for compiling in 1byte boundary.

: : : I have never seen __attribute__ in a c or .h file, is this in a program ? or is this in the standard gcc header files ? If its in a program, look into the code, and check.
: : :
: : : : Does anybody know what the __attribute__ in certain .c and .h files in Linux means?
: : : : Know where I can get additional info?
: : : :
: : : : Thanks,
: : : : Deepak
: : : :
: : :
: : :
: :
: : Do a grep for __attribute__ in the source files of Linux components.
: :
: : D
: :
: :
:
: Check out http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_4.html#SEC84
:
: D
:
:

Re: attribute in C programing

Tue, 18 Dec 2001 12:25:28 -0700

: Does anybody know what the __attribute__ in certain .c and .h files in Linux means?

: Know where I can get additional info?

It is quite easy: info gcc.

The keyword __attribute__ ((lalala)) tells gcc,

that function is not just a common function. It can make

many different things with it, due the lalala.

Read the section "C extensions"->"Function attributes"

Re: attribute in C programing

Mon, 05 Dec 2011 01:04:40 -0700

The article is since 2001 but I will answer anyway.

Take for example this code:

struct Packaging {
    char c;
    int i;
} Packaging;

sizeof(Packaging) will be 8 Bytes.

or you could do:

#pragma pack(push)
#pragma pack(1)

struct Packaging {
    char c;
    int i;
} Packaging;

#pragma pack(pop)

sizeof(Packaging) will be 5 Bytes because of aliasing.

We can use __attribute__ instead of #pragma, like this:

struct Packaging {
    char c;
    int i;
} __attribute__((packed)) Packaging;

It will have the same effect as pragma.
And there are a lot of other uses for __attribute__.

Re: attribute in C programing

Wed, 27 Jun 2012 02:15:59 -0700

Hi,

I have just noticed that all my files have the attribute C. I've been running XP on the machine for several years, and I never noticed that before.

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Re: attribute in C programing

Wed, 27 Jun 2012 02:17:51 -0700

Hi,

I have just noticed that all my files have the attribute C. I've been running XP on the machine for several years, and I never noticed that before.

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