using coomand ==lspci on the terminal will give ou list of all chipset for audio card , usb ,serial, parallel ,vga …….etc

Successfully implemented client server communication using threads and socket.

Problems which you might face

1>unsuccessfull bind()

2>unlinking not successfull in AF_INET,,,unlink() won’t work in  this case.

2.1>server_addr.sin_addr.s_addr=IPaddress like 192.168.1.0 not taking showing warning.

3>when to create processing_client and server socket……

in thread or main().

O/P–>block on read or write will definitely occur on server-pro_client side…….

When we use fork( ) to create a child process the child process
does not contain the entire data and code of the parent process.
Then

Does it mean that the child process contains the data and code below the fork( ) call???????

Even this is not so. In actuality the code
never gets duplicated. Linux internally manages to intelligently
share it. As against this, some data is shared, some is not. Till the
time both the processes do not change the value of the variables
they keep getting shared. However, if any of the processes (either
child or parent) attempt to change the value of a variable it is no
longer shared. Instead a new copy of the variable is made for the
process that is attempting to change it. This not only ensures data
integrity but also saves precious memory.

both behaves in the same manner.prints the same value.

2>> ++*s   means value print the the incremented value at pointer s.

arises bcoz in your function you are defining variables in b/w the statements….correct method is you define and declare varibles at beginning of the function only……

1>>you trying to access a location in kernel space which you are not authorised.

2>>you are trying to write data in the memory location which is not part of quantums(***MAJOR CRASH***).

switch(choice)
{
case 1:
base=2;
case 2:
base=8;
case 3:
base=16;
“enter your no\n”;
convert(num,base);

convert(int num,int base)
{

int rem;
rem=num%base;
num/=base;
if(num>0)
convert(num,base);
if(rem<10)
printf(“%d”,rem);
else
printf(“%c”,rem-10 + ‘A’);

}

1) Multiple definitions of the variable {bcoz of wrong use of extern}

2)control reaches end of non-void function{bcoz not returning any value to that non-void function}

3)warning: variable ‘lscullqset’ set but not used {bcoz variables initilised but not used}
4)***-1 Unknown symbol in module {bcoz u have used a variable which was not able to reference the driver properly}
5)warning: assignment from incompatible pointer type [enabled by default]
/home/project_05/devwrite.c:6:20: warning: variable ‘lscullqset’ set but not used [-Wunused-but-set-variable]
/home/project_05/devwrite.c:4:49: warning: unused variable ‘device_size’ [-Wunused-variable]
/home/project_05/devwrite.c:4:35: warning: unused variable ‘data_size’ [-Wunused-variable]
/home/project_05/devwrite.c:4:22: warning: unused variable ‘qset_size’ [-Wunused-variable]
/home/project_05/devwrite.c:4:7: warning: unused variable ‘quantum_size’ [-Wunuse

1>Be very patient as you will get different errors with silly solutions.

2>As you are dealing with multiple files like in my case files are header.h,declaration.h,init.c,clean.c,fops.h,prototypes.h,devopen.c,

devrelease.c,devwrite.c…BE CAREFUL about the handling the variables used in these files….

3> Using EXTERN command ,,, just keep a single logic where to declare extern and how to use it.

4>sometimes the TEST script can make a issue…so also update your script acc. to programs.

5>Don’t used any variable or pointer which has no use.although there would be warning no error…but it will create problems in inserting the driver.