Balbir Singh <balbir@...> writes:
>
> On Tue, Jan 25, 2011 at 2:26 AM, adansilva05@...
> <adansilva05@...> wrote:
> > Hi All,
> >
> > I want to develop an application in C/C++ that allows to make
> > calls directly to
> > cgroups, do you can make Cgroups operations from a program in C/C++?
> >
> > if possible, there is an API to do this, wich packages i should
> > install? or how i do this?
> >
> > or someone who can help me on this issue?
> >
>
> The library is written to be called from C/C++ code. Please see
> src/tools for examples of API usage. Please see tests as well. There
> is generated documentation at
> http://libcg.sourceforge.net/html/index.html.
>
> For pacakges to be installed, please see your distro, it should be
> libcgroup-devel or libcgroup-dev.
>
> Balbir
>
>
Hi Balbir,
I have ubuntu 10.10, the package i need is libcgroup-dev.
I installed the package successfully (apt-get install libcgroup-dev).
i try to compile a simple example that I did using this library, but
when compiling I have the following error:
my little program to test:
cgcreate.c
#include <libcgroup.h>
int main(int argc, char *argv[])
{
int ret = 0;
/* initialize libcg */
ret = cgroup_init();
return ret;
}
to get compiling:
root@comun-Inspiron-530s:~# gcc cgcreate.c -o create
/tmp/ccxO3B0V.o: In function `main':
cgcreate.c:(.text+0x12): undefined reference to `cgroup_init'
collect2: ld returned 1 exit status
what is the problem I have?
I check the installed library libcgroup.h which is in /usr/include
which refers to init.h to use cgroup_init() function, and see that
init.h only has:
ifndef _LIBCGROUP_INIT_H
#define _LIBCGROUP_INIT_H
#ifndef _LIBCGROUP_H_INSIDE
#error "Only <libcgroup.h> should be included directly."
#endif
#include <features.h>
__BEGIN_DECLS
/**
* @defgroup group_init 1. Initialization
* @{
*
* @name Initialization
* @{
* Application must initialize @c libcgroup using cgroup_init() before
*any other @c libcgroup function can be called.
*/
/**
* Initialize libcgroup. Information about mounted hierarchies are
* examined and cached internally (just what's mounted where, not
* the groups themselves).
*/
int cgroup_init(void);
/**
* Returns path where is mounted given controller. Applications
* should rely on @c libcgroup API and not call this function directly.
* @param controller Name of the controller
* @param mount_point The string where the mount point location is
* stored.
* Please note, the caller must free the mount_point.
*/
int cgroup_get_subsys_mount_point(const char *controller,
char **mount_point);
/**
* @}
* @}
*/
__END_DECLS
#endif /* _LIBCGROUP_INIT_H */
in which I see that the function cgroup_init() is only declared and
not defined, I do not understand.
also i try to compile the example cgcreate.c that is on the folder
src/tools. and I get this error:
root@comun-Inspiron-530s:~/libcgroup-0.37/src/tools# gcc cgcreate.c -o create
cgcreate.c:17: fatal error: libcgroup-internal.h: No such file or directory
compilation terminated.
So, what is the problem I have, or what I have to do to use these functions?
I appreciate your help has been of great importance, I am a computer
science student and I'm a fresh man on this part of linux.
thanks
Regards,
[email protected]
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