TASK_RUNNING undeclared

[jesusitoLinux]

Hello friends! I am developing using a sytem calls and macros. When I use TASK_RUNNING and compile I get this error message:

/home/jesus/pruebas/c/proceso1.c:8: error: ‘TASK_RUNNING’ undeclared (first use in this function)
/home/jesus/pruebas/c/proceso1.c:8: error: (Each undeclared identifier is reported only once
/home/jesus/pruebas/c/proceso1.c:8: error: for each function it appears in.)

I put the simply code:

#include <stdio.h>
#include <linux/sched.h>

int main()
{
	int a=TASK_RUNNING;
	set_current_state(a);


}

I have searched in the Web, and I only found solutions saying for include <linux/sched.h>, but I doesn't work!!
Thank you very much!!

[Rubberman]

Sorry it took so long to get to this - I've been away for the holidays.

The macro TASK_RUNNING is defined in your Linux kernel development include directory, usually /usr/src/linux/include/linux/sched.h. By default, the compiler will take what it finds in /usr/include/linux/sched.h for your #include <linux/sched.h>, and TASK_RUNNING is not defined there. You need to add the -I /usr/src/linux/include to your compile command and/or CFLAGS in your Makefile.

[jesusitoLinux]

Many thanks Rubberman. but i still get the same error. Maybe my command line isn't correct. I put it

 gcc -l /usr/src/linux-source-2.6.32/include/linux/ proceso1.c -o proceso1

[Rubberman]

Many thanks Rubberman. but i still get the same error. Maybe my command line isn't correct. I put it

 gcc -l /usr/src/linux-source-2.6.32/include/linux/ proceso1.c -o proceso1

Try:

 gcc -I /usr/src/linux-source-2.6.32/include proceso1.c -o proceso1

[jesusitoLinux]

I'm still getting the same error..... I've probed this line

 gcc -I /usr/src/linux-source-2.6.32/include proceso1.c -o proceso1

and this one

gcc -I /usr/src/linux-source-2.6.32/include/linux proceso1.c -o proceso1

The output of the last one is even worse.

In file included from /usr/include/stdio.h:34,
                 from proceso.c:1:
/usr/src/linux-source-2.6.32/include/linux/stddef.h:4:28: error: linux/compiler.h: No existe el archivo o directorio
In file included from /usr/include/stdio.h:75,
                 from proceso.c:1:
/usr/include/libio.h:332: error: expected specifier-qualifier-list before ‘size_t’
/usr/include/libio.h:364: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/libio.h:373: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/libio.h:495: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘_IO_sgetn’
In file included from proceso.c:1:
/usr/include/stdio.h:296: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/stdio.h:302: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/stdio.h:314: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/stdio.h:321: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/stdio.h:363: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/stdio.h:365: error: format string argument not a string type
/usr/include/stdio.h:367: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/stdio.h:639: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/stdio.h:642: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/stdio.h:652: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/stdio.h:682: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fread’
/usr/include/stdio.h:688: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fwrite’
/usr/include/stdio.h:710: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fread_unlocked’
/usr/include/stdio.h:712: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fwrite_unlocked’
proceso.c: In function ‘main’:
proceso.c:6: error: ‘TASK_RUNNING’ undeclared (first use in this function)
proceso.c:6: error: (Each undeclared identifier is reported only once
proceso.c:6: error: for each function it appears in.)

[Rubberman]

I think you are trying to mix user-space and kernel-space headers in the same code. Not a good idea, but if you have to, then take out the -I directive and specify the full path to your source/include directory with the #include directives in your code. IE, instead of

#include <linux/stddef.h>

use

#include </usr/src/linux-source-2.6.32/include/linux/stddef.h>

instead. Not guaranteeing that this weill work, since it will likely include other kernel headers, leaving you still in the lurch...

So, if what you REALLY need are the system call ID's, then I suggest you simply cut/paste them from the kernel header into your code, or your own header file.