All Discussions - EmbLogic

programme to find prime number
0★ 1B 142E Started by poonam.kumari58June 2014Query

Int main () { Int i, n, count; Count =0; p rintf ("enter the num"); Scanf ("% d",&n); for (i=2; i
SEMAPHORE
0★ 1B 71E Started by gkarya1990June 2014Query

do semaphore also disable premtive of kernel???
CHARACTER DRIVER -SPINLOCK
0★ 2B 139E Most recent by gkarya1990June 2014Query

why the spinlock needs preemtive kernel??????
why it is not easy to hack a linux system
0★ 2B 110E Most recent by poonam.kumari58June 2014Query

Password is stored in the file /etc/shadow, it's stored in a "protected" format called a hash.
why linux is called as free OS or open source
0★ 1B 110E Started by poonam.kumari58June 2014Query

linux is open source can you ever see the source code of any of the windows softwares or windows operating system ??? never. But in case of linux, u can see the code of operating system as well as…
how to find that a system is little endian or big endian
0★ 1B 124E Started by poonam.kumari58June 2014Query

int man () { Int i =1;/initialise int variable by 1/ Char *p;/take char pointer/ p = &i /point var i by using char pointer/ If (*p) /if this condition is true then LSB is stored firs…
threads
0★ 2B 118E Most recent by poonam.kumari58June 2014Query

Threads are strands of execution of statements. Each executing process must have one main thread. Threads are also called as light weighted process. Threads are executed on different cores as s…
c
0★ 1B 71E Started by arjunchamyalJune 2014Query

how to find number of cores in a system with the help of c programme .
facing problem while writing into multiple quantum in character device driver
0★ 4B 111E Most recent by poonam.kumari58June 2014Query

Success fully writen into one quantum Bt not being able to write into multiple quantum. ...????
THREADS DISSCUSION
0★ 4B 150E Most recent by anubala331June 2014Query
A Simple Programme Using Threads
0★ 1B 73E Started by sahilchugh0777June 2014Query

1 #include 2 #include 3 #include 4 void* func_name(void*); 5 int main() 6 { 7 void *retval; 8 int ret; 9 pthread_t pid; 10 char message[]="hello to the world of linix"…
ENDINESS OF PROCESSOR
0★ 1B 238E Started by gkarya1990June 2014Query

Can any one explain me about little endian and big indian..
while coding for derver why this bug appears that kernel is enable to handle Null pointer refrence??
0★ 2B 92E Most recent by gkarya1990June 2014Query

while writing the character driver i am facing this bug again and again that ketnel is enable to handle null pointer refernce... can anybody suggest what is the problem???....
DATATYPE MANIPULATION
0★ 1B 90E Started by gkarya1990June 2014Query

unsigned int a=6; int b=-20; if((a+b)>6) { printf("hello"); else printf("bye"); } what is the output??explain with reason.
WRITTING OPERATION IN CHAR DRIVER
0★ 5B 152E Most recent by anubala331June 2014Query

noqset=size/(qsetsize*quantumsize);//if it has 126 characters ...size of file/8*8=126/8*8=2 98 //so i need 2 scullqset to write data bcz each scullqset has array of pointers(4byte)pointing …
Is there any difference between local variable and auto specfier variable??
0★ 1B 107E Started by gkarya1990June 2014Query

auto usage
semaphore.
0★ 1B 85E Started by gkarya1990June 2014Query

how the three versions of semaphore used in different situation???
RCS ..character driver
0★ 1B 107E Started by gkarya1990June 2014Query

@ 1.2 log @*** empty log message *** @ text @d3 1 a3 1 //#include"file_oper.h" @ 1.1 log @Initial revision @ text @d34 1 a34 1 sculldev =kmalloc((sizeof(struct scull_dev)*nod) ,…
USE OF EXTERN VARIABLES IN CHAR DRIVER
0★ 1B 109E Started by anubala331May 2014Query

****VARIABLES WHICH ARE USED IN EXTERNAL FILES*** extern dev_t dev; 2 extern int majorno; 3 extern int minorno; 4 extern int nod; 5 //extern in…
USE OF CLEANUP FUNC IN CHARACTER DRIVER
0★ 1B 116E Started by anubala331May 2014Query

LAST FUNC WILL BE cleanup.c 1 #include"header.h" 2 #include "dec.c" 3 static void cleanup_fun(void) 4 { 5 int lv; 6 //int nod=NOD;dev_t dev; 7 printk(K…
CHARACTER DRIVER
0★ 2B 87E Most recent by ankit.singhal85May 2014Query

DONE WITH WRITE AND READ OPERATION IN THE SCULL...
HOW EXTERN IS USED
0★ 2B 114E Most recent by anubala331May 2014Query
what is Device Driver
0★ 3B 129E Most recent by anubala331May 2014Query

In computing, a device driver (commonly referred to as simply a driver) is a computer program that operates or controls a particular type of device that is attached to a computer.[1] A driver provide…
volatile variable
0★ 1B 97E Started by gkarya1990May 2014Query

when do we use volatile variable???
how seek operation is done in character driver???
0★ 1B 134E Started by gkarya1990May 2014Query

character driver
problems in character driver implementation
0★ 2B 104E Most recent by poonam.kumari58May 2014Query

I am writing device driver for the first time. DEVICE is initialized properly and appearing in modules list. The problem is that when I write bytes in fd which is made from opening node for device dr…
structure doubt
0★ 1B 94E Started by gkarya1990May 2014Query

Do we need to give memory using malloc to the structure object???
while running character driver my system gets Hang..WHY??????????
0★ 1B 77E Started by gkarya1990May 2014Query

CHARACTER DRIVER PROBLEM..
char driver
0★ 1B 79E Started by gkarya1990May 2014Query

what does containerof() do????
problem in cleanup of device driver
0★ 1B 91E Started by gkarya1990May 2014Query

my entry of the device driver is not getting removed instead i have done unregister char dev????
Problem based on major noumber in character driver
0★ 2B 108E Most recent by anubala331May 2014Query

why two drivers cannot have same major noumber?
constant variable
0★ 2B 88E Most recent by anubala331May 2014Query

#include int main() { printf("C programming %s", "Class by\n%s Sanfoundry", "WOW"); } what will it print? please elaborate this.......
Introduction of Character driver and some quries with simple start of character driver
0★ 3B 182E Most recent by anubala331May 2014Query

Working of character driver :see diagram & also see some queries of character driver. The above diagram show how the character driver works in linux , user space to kernel space . but when we …
ipc using pipes
0★ 1B 82E Started by coolpriya2490May 2014Query

total revisions: 1; selected revisions: 1 description: this is the requesting program in which i am adding two value. the value sent by the request is read by the server. -----------------------…
tips to start with character driver
0★ 1B 134E Started by kashishgarg1992May 2014Query

things to be kept in mind while doing "Character Driver"1>Be very patient as you will get different errors with silly solutions.2>As you are dealing with multiple files like in my c…
character driver common errors and warnings
0★ 1B 126E Started by kashishgarg1992May 2014Query

Common Errors which most of us will face while doing character drivers1) Multiple definitions of the variable {bcoz of wrong use of extern}2)control reaches end of non-void function{bcoz not returnin…
c discussion
0★ 3B 129E Most recent by garg.deepakMay 2014Query

int dis(int);int main(){int i=1;dis(i);return 0;}int dis(int a){printf("%d %d %d",a,++a,a++);return 0;}//Its output is 3 3 1 please tell me how?~ …
Type of passing values in function::-----
0★ 1B 112E Started by anubala331May 2014Query

There are basically three ways of passing the values -----1)Pass by value 2)Pass by reference3)Pass by pointer1)Pass by value----actual parameters r passed to formal parameters to another address def…
POINTERS
0★ 5B 169E Most recent by anubala331May 2014Query

void* queue;queue=8;//value will go into queue address but not defined which type of value will go into queue addressint * queue=8;//int type value will go into queue address ,,,typecasted already..…
How to open the file
0★ 3B 248E Most recent by anubala331May 2014001 C Programming, Data Structures

what is the difference between fopen() and open()......similarly in putc() (or) getc() and fputc() (or ) fgetc() !!!!!!!!!!!!!
What is container in device driver
0★ 1B 101E Started by iittashish447May 2014Query

?????
2D ARRAY
0★ 1B 128E Started by anubala331May 2014Query

//Now i m representing an attempt for a 2D array....#includeint main(){int stu[4][2];int i;for(i=0;i
ARRAY USING FUNCTION
0★ 1B 127E Started by anubala331May 2014Query

#includeint display(int*,int);int main(){int*j;int arr[5]={55,22,33,555,65};display(arr,5);//WE HAVE passed base address & no.of times of loop executionreturn 0;}int display(int *m,int x){int i;f…
HOW PONTER BEHAVES BY DOING MALLOC OR NOT DOING MALLOC
0★ 2B 137E Most recent by anubala331May 2014Query

when we declared to a pointer either it may carry char type values or it may carry int or float type values...after declaration ...it get memory at runtime either using malloc or not using malloc...i…
is heap segment exist??
0★ 2B 106E Most recent by anubala331May 2014Root

heap..
diffrence b/w socket & message queue
0★ 1B 338E Started by anubala331May 2014Query

What is the difference between socket & message queue?
can we find the size of the memory allocated by using malloc?????
0★ 2B 132E Most recent by anubala331May 2014Root

malloc..
ARRAY vs POINTER
0★ 5B 173E Most recent by anubala331May 2014Query

For ARRAY arr[4] ----value of array arr[1] or *(arr+1) where &arr[1] represents address of perticular position of array...&arr or (arr+0) is base address of array meansVALUES----arr[0]==*arr=…
PROBLEM RELATED TO SCANF
0★ 2B 145E Most recent by anubala331May 2014Query

#includeint main(){char b;char a;char c;char x[2];printf("enter value for set:");scanf("%c%c%c",&a,&b,&c);printf("a=%c b=%c c=%c\n",a,b,c);printf("enter…
endianness of processor
0★ 4B 149E Most recent by anubala331May 2014Query
what is Device Driver
0★ 1B 93E Started by iittashish447May 2014Query

????
client server communication using ipc
0★ 1B 116E Started by gaba.kapil52238May 2014Query

why there is need to convert an string to integer?? the another way to convert string from an integer value except sscanf??
what is the role of fflush()??
0★ 1B 90E Started by gkarya1990May 2014Query

fflush()..
what is the difference between structure and union
0★ 5B 138E Most recent by spatlouMay 2014Root

how to understand,where we should use structure and where union....??
compilation stages of a c program.
0★ 1B 281E Started by sheenamonga93May 2014Root
Threads
0★ 1B 77E Started by prakhar_saxenaApril 2014Root

As threads use same fds so if a parent thread is using fd and at the same time child thread also want to use fd wat will happen?the child thread will wait or will get terminated??
how is malloc initialization of array is different from initializing it statically???
0★ 1B 115E Started by gkarya1990April 2014Root

mallo...
where is the boot order noted down in bios or cmos???
0★ 1B 115E Started by gkarya1990April 2014Root
WHAT ARE THE ADDITIONAL FUNCTIONS OF BOOT LOADER ,HOW WE CAN MINIMIZE THE OS START UP TIME.
0★ 1B 134E Started by satinder.embdeveloperApril 2014000 Linux System Administration

Hi,we know that boot loader is used for load the operating system but there are some additional functions of bootldr; what are these,how we can defined these ?
linux
0★ 1B 114E Started by abhiwadhwa777April 2014Root

what do you mean by macro ?
cross-compiler
0★ 1B 129E Started by vipsingh.100April 2014Root

now design cross-compiler in my project.may i use other compiler...or cross compiler is necessary.
bash
0★ 2B 89E Most recent by hanspreet.kaurApril 2014Root

what is difference between bash and shell?
what happens when we do malloc(0)?
0★ 1B 146E Started by hanspreet.kaurApril 2014Root

p=malloc(0) p=?
CREATING THREADS AND USING THEM IN CLIENT-SERVER COMMUNICATION
0★ 2B 102E Most recent by fatehdeep.singhApril 2014Root

RCS file: server1.c,v Working file: server1.c head: 1.1 branch: locks: strict root: 1.1 access list: symbolic names: keyword substitution: kv total revisions: 1;…
shell
0★ 1B 79E Started by gagan7230April 2014Root

difference between bash and shell......
message q..
0★ 1B 101E Started by gkarya1990April 2014Root

is it ok to send data of 3 clients and recieve the all three result from server through comman message q../???
script
0★ 1B 73E Started by gagan7230April 2014Root

what is script and what is the use of it?
Initialising the Message Queue
0★ 1B 148E Started by gagan7230April 2014Root

The msgget() function initializes a new message queue: int msgget(key_t key, int msgflg) It can also return the message queue ID (msqid) of the queue corresponding to the key argument. The …
script
0★ 1B 93E Started by arjunchamyalApril 2014Root

why we are doing programming on script .
fifo
0★ 3B 137E Most recent by vipsingh.100April 2014Root

can any one explain FIFO to make inter process communication between more than one client.
fifo in ipc
0★ 3B 126E Most recent by gagan7230April 2014Root

how to read data from multiple clients using single fifo............
messege queue
0★ 1B 120E Started by gagan7230April 2014Root

how to implement messege queue in ipc............................
MDC for master arry size is 8 32 and 128.
0★ 1B 123E Started by ravi.25.rawatApril 2014Root

is there a common logic for all these 3 ,5 and 7
ipc using fifo
0★ 1B 73E Started by gagan7230March 2014Root

RCS file: fifoserver.c,v 3 Working file: fifoserver.c 4 head: 1.4 5 branch: 6 locks: strict 7 root: 1.4 8 access list: 9 symbolic names: 10 keyword substitution: kv 11 total …
Memory
0★ 1B 100E Started by arjunchamyalMarch 2014Root

what is the difference between memory and virtual memory. How does swap work, when memory is full.
IPC:message queue
0★ 1B 118E Started by vipsingh.100March 2014Root

working on message queue but not completed .
LINUX TIPS & TRICKS
0★ 2B 232E Most recent by preetasr1807March 2014012 Linux Kernel Architecture and Internals

Post here shortcuts and some commands that can help somebody to program efficiently and quickly. Vim Editor Command to automatically indent the code with proper tab spaces and to increase readability…
malloc
0★ 3B 106E Most recent by gkarya1990March 2014Root

what will be the output??????? char*ptr=malloc(sizeof(char)*100); printf("sizeof%d %d",sizeof(ptr),sizeof(*ptr));
what is bash..???
0★ 3B 120E Most recent by gkarya1990March 2014Root

bash..
IPC:message queue
0★ 1B 118E Started by vipsingh.100March 2014Root

today ,i have started message but finding some problem to send the data to client to server.
THREADS(between client and server)
0★ 1B 85E Started by harveen.kaurMarch 2014Root

2 RCS file: ser_thread.c,v 3 Working file: ser_thread.c 4 head: 1.1 5 branch: 6 locks: strict 7 root: 1.1 8 access list: 9 symbolic names: 10 keyword substitution: kv 11 t…
Threads are used in IPC
0★ 1B 75E Started by hanspreet.kaurMarch 2014Root

RCS file: server_thread.c,v 3 Working file: server_thread.c 4 head: 1.1 5 branch: 6 locks: strict 7 root: 1.1 8 access list: 9 symbolic names: 10 keyword substitution: kv 11 …
why we include union semun though it is present in sem.h???
0★ 2B 149E Most recent by dheerajMarch 2014Root
ipc
0★ 1B 105E Started by vipsingh.100March 2014Root

i have done ipc using pipe...but find some error.
ipc using fifo
0★ 1B 116E Started by vipsingh.100March 2014Root

ipc between client and server done.but i have problem to return the value of processing client to the server.can i use pipe or fifo at processing client.
fifo
0★ 1B 76E Started by iittashish447March 2014Root

communication between client and server with fifo is completed and communication b/t processing client and server with fifo &pipe are working.what to do please suggest.
FiFo
0★ 1B 86E Started by himanshulkceMarch 2014Root
proc in character driver
0★ 1B 116E Started by atifzaidi92March 2014Root

rcs of proc RCS file: decelerations.h,v Working file: decelerations.h head: 1.3 branch: locks: strict access list: symbolic names: keyword substitution: kv total revisions: 3; selected revisions: …
ipc using fifo
0★ 1B 83E Started by gagan7230March 2014Root

2 RCS file: fifoserver.c,v 3 Working file: fifoserver.c 4 head: 1.3 5 branch: 6 locks: strict 7 access list: 8 symbolic names: 9 keyword substitution: kv 10 total revisions: 3; …
FIFO
0★ 1B 88E Started by himanshulkceMarch 2014Root

I m having problem in implementing fifo while using three clients it is taking garbage value from third client even though i m using semaphore in that.....???
threads made using array
0★ 1B 114E Started by hanspreet.kaurMarch 2014Root

RCS file: thread_array.c,v 3 Working file: thread_array.c 4 head: 1.1 5 branch: 6 locks: strict 7 root: 1.1 8 access list: 9 symbolic names: 10 keyword substitution: kv 11 tot…
THREADS
0★ 1B 86E Started by harveen.kaurMarch 2014Root

RCS file: threads.c,v 3 Working file: threads.c 4 head: 1.1 5 branch: 6 locks: strict 7 root: 1.1 8 access list: 9 symbolic names: 10 keyword substitution: kv 11 total revisi…
Fifo
0★ 1B 79E Started by iittashish447March 2014Root

in creating server with fifo and communication b/t server & client is not performed. How to make it possible.Please tell
fifo
0★ 1B 91E Started by gagan7230March 2014Root

can any one tell how to make ipc using fifos.............
fifo
0★ 1B 86E Started by himanshulkceMarch 2014Root

i got stuck in the problem can we use two named pipe(fifo) between requestingclient and server to take input and similarly two pipe between processing client and server for taking result......
MESSAGE QUEUES(server ,3 requesting clients,3processing clients)
0★ 1B 100E Started by harveen.kaurMarch 2014Root

2 RCS file: mser.c,v 3 Working file: mser.c 4 head: 1.1 5 branch: 6 locks: strict 7 root: 1.1 8 access list: 9 symbolic names: 10 keyword substitution: kv 11 total revisions…
MESSAGE QUES PERFORMED......(1 SERVER,3CLIENTS,3PROCESS)
0★ 1B 83E Started by hanspreet.kaurMarch 2014Root

RCS file: server_msg.c,v 3 Working file: server_msg.c 4 head: 1.1 5 branch: 6 locks: strict 7 root: 1.1 8 access list: 9 symbolic names: 10 keyword substitution: kv 11 total r…
MDC RCS
0★ 1B 148E Started by gkarya1990March 2014Root

RCS file: ./mdc.c,v Working file: ./mdc.c head: 1.1 branch: locks: strict access list: symbolic names: keyword substitution: kv total revisions: 1; selected revisions: 1 description: create key fi…
configured dhcp server and nfs server.
0★ 1B 108E Started by gaba.kapil52238March 2014Root

download the package dhcp. remove the securities i.e. firewall, selinux. copy syntax from sample file of dhcp.conf into dhcp.conf file. edit the config file of dhcp like option routers,subnet masks, …
Semaphore
0★ 3B 128E Most recent by himanshulkceMarch 2014Root

Understood the topic of semaphore if any one have problem lets discuss here itself......so that we can learn something new.

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