My distribution is Fedora 12. When I want to get the infos of kernel functions such as printk, i type man printk, failed. I look up some articles and learn that in some distributions the kernel functions is in section 9 of man page. Then i type man 9 printk also no reply. How can i get man pages of kernel functions ?
View 2 RepliesI'm trying to call some kernel functions from userspace, but I'm not sure if I'm doing it right. The functions control a pulse width modulator on an embedded platform. To pick one at random, the function:
Code:
struct pwm_device *pwm_request(int pwm_id, const char *label);
is defined in linux/pwm.h, and the implementation uses the macro EXPORT_SYMBOL(pwm_request), so I should be able to call this from user-space... right?
Anyway, I've got linux/pwm.h to #include in my source so the compiler knows what it's doing, but what do I link against? The only place in by kernel build tree where I can see a symbol pwm_request defined is in object files like vmlinux.o, built-in.o in the directory, etc. which I don't think I should be linking against.
I am dealing with some Linux kernel code, which define most its functions with Macros.The trouble I am having is to use those code in user space in Windows.
For example, I have a function defined like this:
#define list_for_each_entry_safe(pos, n, head, member)
for (pos = list_entry((head)->next, typeid(*pos), member),
n = list_entry(pos->member.next, typeid(*pos), member);
&pos->member != (head);
pos = n, n = list_entry(n->member.next, typeid(*n), member))
And in user space code, I call it in this way:
list_for_each_entry_safe( pcre_item, tmp,
&(((pcre_list_head_t *)(hr.value))->head), list)
{
// My code to handle each element in the list
}
This is working like a charm in Linux, but I got errors in Windows:
It reminds me missing ';' after 'list_for_each_entry_safe( pcre_item, tmp,
&(((pcre_list_head_t *)(hr.value))->head), list)'.
Does this kind of linux code not working in Windows at all? (Linux is in GCC C stand and VC is ANSI C) I prefer not to convert them to normal functions but keep it the way if it could be working under windows by some tricks.
Is it possible to define functions within other functions in C++? I know it is the case in other languages.
View 2 Replies View RelatedHow can I find page hit and page miss ratio in linux fedora core 12?
View 3 Replies View Relatedwanted to know if i can execute commands on linux console through a web page and redirect it back to my web page !For example :if i send a query "ls"it should execute this command on my linux console and also redirect the list of the files to the web page from which i give the command !
View 8 Replies View RelatedI need help as I am not proficient with Linux C++ Programming. There are two parts which I need to do in the coding provided below.
1. Produce the program so it can output the word "Hey there!" and wait two minute and print the word "See you later!".
2. Produce the program that will output the text "Cool" every 20 seconds by setting a periodic task.
Quote:
#include <linux/kernel.h>
#include <linux/module.h>
MODULE_LICENSE("GPL");
int init_module(void)
{
printk("Hey there!
[Code]...
Environment: Ubuntu 10.10 Desktop
Description: I am trying to create a custom pxe booted environment to automate the repair of systems.
I've successfully created a custom initramfs and booted it. So far everything is working well. I had manually added in modules, I had copied over binary tools and they do work. The system boots fine and stops at the prompt below where I can manually perform all the tasks I need: (initramfs)
Problem:
1) I tried adding in custom scripts to automate the above process in "init-bottom" and "local-bottom" but they all fail saying that "panic", "log_begin_msg", "log_end_msg" don't exist. They are in the "functions" file though.
2) It's entirely possible this is related to the root mount. I don't want to mount a disk as a root device. In fact I am just happy with the (initramfs) prompt. So far I've just removed the "set root" option from grub and it just complains but continues anyways. This could be why it can't find the functions.
#!/bin/sh
PREREQ="mptctl"
prereqs()
{
[Code]....
I have a Canoscan LiDE 30 scanner which works fine in Linux. I haven't used it in months, and never since moving from Jaunty x86_64 to Fedora 11 x86_64. This evening I suddenly need to scan two pages to send to someone via e-mail, and the recipient is desperate to receive them. Naturally, Xsane has decided this is the moment to screw me.
The problem: I cannot figure out how to tell Xsane that the page size is 8.5 11. It insists on scanning only the left side, 3.99 x 11. I cannot find a page size anywhere in any of the buttons.
In Preview I once got it to scan the entire page, but could not figure out how to save the image to file. Subsequently I have not been able to figure out how I did it. In any event, scanning from the small main window always scans 3.99 x 11. Adjusting the scan area manually in the Preview window allows me to change the size area in the small main window to 8.5 x 11, but when I then scan from the small main window it reverts to 3.99 x 11.
I have scanned the document a hundred times at least, each time trying different buttons, but nothing has succeeded in getting the full page.
I am the new child of the linux world. What is the difference and working functions between kernel and shell..
View 5 Replies View RelatedI am a newbie of KDE desktop. Where can I find the functions of control center of Gnome in KDE desktop? For example, the "Remote Desktop Preference"
View 6 Replies View Relatedwhat kernel file holds the functions for the hardware configuration. I'm interested in finding the hardware timer of the linux and the DMA configuration file. I assume there is a single file that holds configuration data for the platform.This probably is executed before the kernel is started. As is see it this must be some hardware abstraction layer file because the actual kernel code is not platform dependent.
View 1 Replies View RelatedNone of my daemon scripts work now, and the startup process displayed errors. Should I reinstall the OS and start from scratch, or is there a way to recover these files? Is there a way to rebuild the files I deleted?
View 2 Replies View Relatedcould you please explain few questions about systemtap.
1st
===
seems gettimeofday_s() always returns 0 Code: stap -ve 'probe timer.s(4){ printf("%d ",
[code]....
Where are the definitions for C library functions located? It was just recently that I realized that header files don't actually define any functions, they merely include their prototypes.
For instance, stdio.h includes the following line:
Code:
This just means that the definition of printf() is located in another file. What file? Is there some kind of default shared object file that is automatically included during compilation?
I have problem to use an alias that defined in ksh93 script,in the functions in the same script onm Linux.I definied an alias in main: alias echo='echo -e' in order that echo will read backslashes but when i executed it in function, the alias didnt work, and performewd a regular echo, without -e
cat test.ksh
#!/bin/ksh
alias echo='echo -e'
checkUsage
[code]....
have an application where from time to time I need to check the db for some value and run some functions to do some checks. is the best option do it as php daemon or cron job?Whatworried of cron job is the overalapping.
View 9 Replies View RelatedBut what is the difference between this...
Code:
my_fucnction () {
echo "Hello World"
}
Code:
function my_fucnction {
[Code]...
Im implementing a chat application using Jabber/XMPP and gloox framework which should send and receive messages concurrently in Ubuntu Linux.
The problem faced is both the threads are created and pthread_join( ) is called for both.The iSend thread is scheduled first but gets suspended at cin. Once the recv( ) function is called, which runs in iRecv thread, the recv call back function handleMessage( ) is called. However the control never shifts back to the iSend thread which should call SendMessage( ) function.
I am trying to write a simple program in C that involves nesting switches. For example switch 1 offers an option to go to module 1 or 2 or quit. when I go to module 1 there is another switch function offering two or more choices.
I can select either module 1 or 2 at the start of the program and the selection text for, say, module 1 prints to screen but then exits without allowing a second selection to be entered.
I tried using free([first selection]) thinking that might do the trick but it doesn't.
Is it possible to next switches on after another in C?
The pthreads library on macos does not have barrier functions (pthread_barrier_t ....). Is there a way to get around this? I know I can do :
#ifdef __APPLE__
pthread_barrier_t ...
#else
my_barrier ...
#endif
But I would like to avoid this approach as there are a lot of places in my program where I would have to make this change. Can I perhaps rebuild the pthreads library on macos without affecting other apps ?
Let's show the problem: I have a socked connection (in a fd var). In certain moment, I need to use the same socket in two threads. Lets see in the example:
Code: int main(void)
{
int fd; // the socket
[code]....
I have functions which return different data like: int, char*, double...
I also have a list of datatypes (INTEGER, TEXT, REAL...) which can be returned.
I need to map a datatype with function, which purpose is to return it. Therefore, when I determine a datatype, I would like to call the required function without doing switch all the time.
My idea is to have an array of structs like this:
Code:
struct type_func_map
{
int type;
void (*func_wrapper_int)(void); //void (*func_wrapper_text)(void); void (*func_wrapper_real)(void);
};
[Code].....
I feel like there should be a cleaner way of doing this. I have one file, for example "a.cpp", calling a function from another file, "b.cpp". Currently I have it set up so that header for "b", "b.h", has the declaration of its functions. And then I'm just including "b.h" in "a.cpp". Do I have to include the "b" header file in "a" to be able to call a function from "b"? Or is there a better way I could be doing this? Like doing something different at compile?
View 7 Replies View RelatedI've encountered a problem when running a simple bit of code, I'm using c to read write data to a binary file. It works fine when I run as root. However when I run as a user it produces the file, however when I try to open / write after it's produced it caused a seg fault. Is there any reason file functions ( fopen etc ) would work for root and not a user and is there a way to fix this?
View 14 Replies View RelatedSo if you are a PHP-programmer (average one) and code for money, how many of funtions and operators of PHP should you remember by heart (in real life)? I was looking through php.net and man there are millions of tons of them!
View 9 Replies View RelatedI have created a glade file which so far have two regions in it:
1) On the right division is a toggle button which calls a C script when enabled.
2) I have a drawing area, in which I would like to plot a point (X-Y scatter plot). The plot should be generated dynamically using a C script. I am not sure how the integration between the two is possible for a drawing area.
In glade what properties of drawing area should I set? eg.expose event, realize etc. I was thinking of using cairo for generating the plot.
does anybody idea how to use java functions in python script ?
View 1 Replies View RelatedDo you know where can I find documentation to SoundTouch library a its functions?
View 2 Replies View RelatedSo I'm teaching myself some scripting to try and create a fairly simple photobooth type affair... I've got gphoto2 playing fairly nicely with my canon, and imagemagick taking that output and rearranging it to a vertical format...
EDIT:
*smacks forehead*
Fairly simple to do what I needed initially: Code: feh -FZ -D 1 --cycle-once $COUNTDOWN & sleep 2 &
feh -FZ -D 20 --cycle-once $SMILE This shows a countdown from 5 to 1 in images and $SMILE is big that says 'smile'
So my question is thus... (fairly basic but I can't get my head round the use of & and sleep in this context) what's the best way to call my gphoto instructions (or a script with them in) mid way through the above code?!
'feh code'
sleep 5
'gphoto code'
this kind of thing seems like the way, but the'sleep 5' and 'gphoto code' doesn't start until feh is finished in this case?