Error in creating /proc file
dear sir, i am actually trying to create a thread directory in which files will be created by the name of the thread id which will contain the basic information about the thread (similar to process concept of kernel) but i want to the detail steps about how the kernel implements its process information inside the proc file so that i can do it similar kind in case of creating for the threads. the first basic problem is the according to me the 1.the actual processes are creting in the do_fork function and from there the information is passed to the fs/proc in the functions present in the generic and base.c am i currect or the fs/proc is collecting the data from the current but in this case i was applying a shortcuts as i was waiting for any proc file in the kernel to be written during startup and the setting a global variable in fs/proc/base.c after that in the do_fork the function waits for the global variable to be turned on and after that calls anather function which creates proc files through the use of create_proc_entry. but during startup the following errors are coming " *pde= Oops: [#1] PREEMPT Modules link in: CPU: 0 EIP: 0060:[] Not tainted EFLAGS: 00010202 (2.6.8) EIP is at register_proc_table+0xdc/0x130 eax: ebx:c0321d40 ecx:1006 edx:c02e28c5 esi: edi: ebp:0006 esp:c7e95fb0 ds: 007b es: 007b ss:0068 Process Swapper(pid :1,threadinfo =c7e94000 task=c7e93670) Stack: c03635e4 c03635e4 c03635e4 416d 00100410 c03a8ee8 c0321d40 c039e8ac c0100445 007b c01040e0 c01040e5 Call Trace : [] init+0x0/0x158 [] sysctl_init+0x18/0x20 [] do_basic_setup+0xa/0x20 [] init+0x35/0x158 [] kernel_thread_helper+0x0/0x10 [] kernel_thread_helper+0x5/0x10 Code: 8b 78 34 85 ff 74 b7 8d b6 00 00 00 00 8d bc 27 00 00 00 00 <0> Kernel panic : Attempted to kill init! " 2.if i am in a wrong way i could do the implementation in the following manner in which the kernel implements the proc system of its process part. but i am really confused about that one .i need some kind of help in that case is it necessary to do all the details implementation like inode creating which are all being done in the generic and base.c or i can simply bypass them with create_proc_entry what should i do suggest me some architecture to implement the thread proc system i can a way out and i cant able to understand where i am wrong thanks in advance sounak Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
problem with process and threads
dear sir The number of processes that are being created in fork.c() in function do_fork are less than the number of processes are being terminated in exit.c in function do_exit(). I am placing a printk() in both the above functions do_fork() and do_exit() and thus after compiling and then restarting i am getting exit messages of many process ids that have not yet been formed. Another question is that while we are using an AND operation to distinguish between a process and a thread ( if(p->flags & CLONE_VM) in fork.c in function do_fork() in linux kernel 2.6.8 ). But if i use the above check in do_exit() , will it be able to distinguish between a thread and a process in the same manner as do_fork(). If this is not the case , then plz tell where i am wrong and rectify my mistake. One more problem is while p->active_mm is equal to NULL in case of kernel threads and not NULL in case of user level threads ; through this check we can identify kernel and user level threads in fork.c but in exit.c the same p->active_mm value is not NULL for kernel and user level threads. Hence i want to know how can i make a distinction between kernel and user threads . Is there any other way? Eagerly waiting for a reply, Thanks in advance, Sounak Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
error while implementing kill()
dear sir, I am unable to use the system call kill(pid,sig).I have included the header file . I used it in a module to kill a process. The module is compiling properly but giving the following error while inserting the module, unresolved symbol kill() I am unable to track the bug here. kindly help me out. I want to kill a process through the process ID inside a module. Is there any other approach other than using the kill() function? Thanks in advance, sounak Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
timer implementation
dear sir i want to implement a timer inside the kernel so that a specific function of mine is called after certain period of time how to implement that? thanks in advance sounak Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
repeat a function after fixed time period
dear sir i want to call my own function inside the kernel after a fixed interval(i.e some kind of timer) how to do that which function i have to use to repeat the function anather way is that making my own system call which calls my function and this sytem call is being access by a user program which calls it after a fixed inter val of time will this be correct thanks sounak Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
compilation problem of modules
the code of the module that i written is as follows:
#define MODULE
#include
#include
#define MODULE_NAME "manti"
struct manti
{
char mm[20];
};
static struct proc_dir_entry *example_dir;
struct manti m1;
int init_module(void)
{
example_dir=proc_mkdir(MODULE_NAME,NULL);
if(example_dir==NULL)
{
printk("<1> error in creation of proc file\n");
}
else
printk("<1>success in creation of proc dir\n");
}
void cleanup_module(void)
{
remove_proc_entry(MODULE_NAME,NULL);
printk("<1>proc entry removed\n");
}
here iam just making one directory in the proc file
named manti
i am trying to compile it like
gcc -c proc.c
where the kernel version is 2.4.20-8
but i am getting following errors
In file included from proc.c:5:
/usr/include/linux/proc_fs.h:47: parse error before
"off_t"
/usr/include/linux/proc_fs.h:51: parse error before
"off_t"
/usr/include/linux/proc_fs.h:57: parse error before
"mode_t"
/usr/include/linux/proc_fs.h:59: parse error before
"uid"
/usr/include/linux/proc_fs.h:60: parse error before
"gid"
/usr/include/linux/proc_fs.h:70: parse error before
"count"
/usr/include/linux/proc_fs.h:72: parse error before
"rdev"
/usr/include/linux/proc_fs.h:176: parse error before
"mode_t"
/usr/include/linux/proc_fs.h: In function
`proc_net_create':
/usr/include/linux/proc_fs.h:177: `NULL' undeclared
(first use in this function)
/usr/include/linux/proc_fs.h:177: (Each undeclared
identifier is reported only once
/usr/include/linux/proc_fs.h:177: for each function it
appears in.)
/usr/include/linux/proc_fs.h: At top level:
/usr/include/linux/proc_fs.h:181: parse error before
"mode_t"
/usr/include/linux/proc_fs.h: In function
`create_proc_entry':
/usr/include/linux/proc_fs.h:181: `NULL' undeclared
(first use in this function)
/usr/include/linux/proc_fs.h: In function
`proc_symlink':
/usr/include/linux/proc_fs.h:185: `NULL' undeclared
(first use in this function)
/usr/include/linux/proc_fs.h: At top level:
/usr/include/linux/proc_fs.h:186: parse error before
"mode_t"
/usr/include/linux/proc_fs.h: In function
`proc_mknod':
/usr/include/linux/proc_fs.h:187: `NULL' undeclared
(first use in this function)
/usr/include/linux/proc_fs.h: In function
`proc_mkdir':
/usr/include/linux/proc_fs.h:189: `NULL' undeclared
(first use in this function)
/usr/include/linux/proc_fs.h: At top level:
/usr/include/linux/proc_fs.h:192: parse error before
"mode_t"
/usr/include/linux/proc_fs.h:193: parse error before
"off_t"
/usr/include/linux/proc_fs.h:193:
`create_proc_read_entry' declared as function
returning a function
/usr/include/linux/proc_fs.h:196: parse error before
"mode_t"
/usr/include/linux/proc_fs.h: In function
`create_proc_info_entry':
/usr/include/linux/proc_fs.h:197: `NULL' undeclared
(first use in this function)
/usr/include/linux/proc_fs.h: At top level:
/usr/include/linux/proc_fs.h:203: `NULL' used prior to
declaration
proc.c: In function `init_module':
proc.c:16: `NULL' has an incomplete type
proc.c:17: invalid operands to binary ==
proc.c: In function `cleanup_module':
proc.c:26: `NULL' has an incomplete type
how to solve it
plz help me
is my compilation method is wrong or something else
thanks
sounak
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architecture to implement communication between static kernel with dynamic module
there is one my_own module which i will insert whenever i like through insmod. thus when the module is loaded it will create a proc file now i want to send the structure variable of task_struct i.e p to the module from the kernel at point when the execution passes through forking a new process i.e at the function do_fork() in fork.c in linux/kernel folder how to do this how can i call the module from that point (i.e in do_fork()) and pass the task_struct *p as parameter to the module can i declare an arbitary name in fork.c of my module and compile the new kernel? i think i cannot since i am inserting a dynamic module to a static kernel executable and how does the kernel will know that this module will be attached later to it. it will show errors while compiling the new modified kernel can you help me ? what path i must take thanks sounak Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
symlink to proc file
dear sir i want to create a symbolic link to my own proc file system (which has been already created in /fs/proc/root.c) from the /kernel/fork.c how to do it i actually want to write inside the proc directory using the syslink what will be the syntax and the parameter passed could you plz explain me the parameters passed to struct proc_dir_entry* proc_symlink(const char* name, struct proc_dir_entry* parent, const char* dest); thanks sounak Yahoo! India Matrimony: Find your life partner online Go to: http://yahoo.shaadi.com/india-matrimony - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Boot sequence of /proc filesystem
Hi, I am writing some piece of code in the linux kernel 2.6.8 , in the files linux-2.6.8/kernel/fork.c ( in function do_fork() ) and linux-2.6.8/kernel/exit.c ( in the function do_exit() ). My objective is to execute the code immediately after the kernel has mounted the /proc filesystem. This is because i am creating new subdirectories in the /proc fs. What is the checking condition i should place inside the kernel so that i can verify that the /proc fs has been mounted during booting and now my code can be executed by the kernel. Is there any global variable that gets turned on when the /proc fs is mounted during booting. Also my code should continue executing until the /proc fs has been unmounted during shutdown process. It would really help me if you can suggest a wayout. Thanks in advance. Sounak Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
mounting and unmounting of /proc filesystem
hi which file and function inside the kernel (is called) during the mounting of proc file system while system startup. Is it do_mount? And in which function does the unmounting of the proc file system during shutdown thanks sounak Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: repeat a function after fixed time period
--- linux-os <[EMAIL PROTECTED]> wrote:
> On Wed, 23 Mar 2005, Arjan van de Ven wrote:
>
> > On Wed, 2005-03-23 at 15:56 -0500, linux-os wrote:
> static void start_timer(void)
> {
> if(!atomic_read(&info->running))
> {
> atomic_inc(&info->running);
> >>>
> >>> same race.
> >>
> >> No such race at all.
> >
> > here there is one; you use add_timer() which isn't
> allowed on running
> > timers, only mod_timer() is. So yes there is a
> race.
> >
>
> Well add_timer() is only executed after the timer
> has expired
> or hasn't started yet so the "isn't allowed" is
> pretty broad.
> If I should use mod_timer(), then there are a _lot_
> of buggy
> drivers in the kernel because that's how a lot
> repeat the
> sequence. Will mod_timer() actually restart the
> timer???
>
> If so, I'll change it and thank you for the help.
i have applied the code
as i was intedded to call a function repeated ly in
fork.c i written the code over there
it compiled smoothly
but while booting
it is showing
kernel panic no init found
kjournal starting .commit interval after 5 seconds
sounak
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sched.c function
Dear sir, I am new to kernel. I want to know which function in the file sched.c or procedure is called to bring a process for processing in the CPU after context switching. Thanks in advance, Sounak Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: sched.c function
> What exactly do you want to know about the > scheduler? > I had a wild idea to process one function that repeatedly checks the task list and find out which process is in which state At first i retrieve the information from fork.c in do_fork() and exit.x in do_exit() but the problem it showed me is that the information of the task at the beginnig and at the end(termination) but the process may be in different states at different moment in between these two extremes(start -- end) So how to know that . I can run for_each process after certain interval of time , but rather than using timer i thought to set a value or call the function (for_each_process) whenever sheduling occurs(that is some process is going to sleep and some are awakening) that is i am getting some changes in the task list after that.. is my approch is correct ? or should i implement timer ? plz help me i am sorry if some of my concepts are wrong as i am new to kernel and would be obliged if you correct me thank for your help sounak Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: sched.c function
> Tasks do not change their state without holding a > lock. (There is an exception, > but it is justified.) list after that.. > > So you want to record task state changes? That is > better done at the right > places in the kernel rather than traversing the task > list repeatedly (the > latter is not that performant). So you want to say that only one task could be running at a single time but how to know which one is there any way without traversing the task list previously i thought of for_each_process(p) if(p->state==running) but without this how to find which process is currently running and other are sleeping may it is through "current" since the current->pid is only running but i have to run this repeatedly to get the information of currently running process(since this may be for a fraction of a second and i can miss that process if my loop is longer) how to do that fast timer or any other way i am little bit confused > I would be interested in the background: what do you > need to know the task > states for? i want to develop a task manager for threads. the application reads properly the process information and the thread information but not able to refresh the thread information as i am building my own proc file where only threads are there i am distinguishing between process and thread at fork.c with clone_vm set.. therefore i need to know which thread is currently running or not there is another problem i am discusing with you i want to distinguish between thread and process and after distinguishing between user thread and kernel thread but i am unable to find any condition which will be true for kernel level thread during creation and false for user level thread can you help me in this also thanks sounak Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
functions where threads gets exited
dear sir i i want to know the information about any the threads (user and kernal both) that are being exited so which file/function is last called for exiting the threads. is is do_exit in exit.c or any other fuction i need the information about both the user level as well as kernal level threads thanks in advance sounak Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
function called when a thread gets terminated
dear sir i want to design a system moniter for linux could you just guide me on what will be the basic architerture like: i have thought of kernel(using printk)->logfile(myfile)->application but in order to make it real time .please correct me on this architecture and i am unable to find some functions where the user as well as kernel threads are actually exited also i want to distinguish between the user level and kernel level at that moment.but as i have done during the forking of thread in fork.c in do_fork function through the use of if(p->mm==null)i could check the kernel thread or user thread but i am unable do so during exit in exit.c in do_exit function it seems that in somewhere between execution the tsk->mm is being filled up . so do i need to find some other place from which i can find out about exiting threads and processes and what will i check to see the user thread is exited or kernel thread. thanks sounak Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
