EmbLogic » dhanashri

IPC

dhanashri — Wed, 20 Jun 2012 07:45:10 +0000

When two processes are communicating via fifo and if they are in the blocking state say block on open, block on read/write, what is the state of the process during this blocking state. Is it sleep state or wait state … Continue reading →

Something important abt pointer

dhanashri — Thu, 26 Apr 2012 12:24:44 +0000

int main(void)
{
char *ptr;
ptr = malloc(sizeof(char)*20);

printf(“%p\n”, ptr);
ptr = “hello”;
printf(“%p\n”, ptr);
printf(“The sting is %s\n”, ptr);
free(ptr);
return 0;
}
Check the above program. Ptr address is different in first and second case. Also free will give segmentation error. Because allocated mem and where hello string is there are different. So the correct way of copying string is strcpy(ptr, “hello”) and not by ptr = “hello”;

Driver Assignment

dhanashri — Mon, 16 Apr 2012 08:24:17 +0000

Following assignments to complete.
1) Implement lkm in which perform reading writting for multiple quantums.
2) Write two different application, one for reading and one for writting. Make a common node. Writer will write and reader will read.
3) Read and deallocate the quantums and qset after reading.
4) Write multithreaded application when there would be a writer thread and reader thread within the same application.
5) Implement llseek operation across the quantums.
6) Implement the non-seekable device by using the non-seekable open call. Create the 2.x version for non-seekable driver under rcs.

Char Driver

dhanashri — Fri, 30 Mar 2012 10:56:47 +0000

Implememted multiple quantums writing and reading successfully.

SizeofStruct

dhanashri — Wed, 28 Mar 2012 06:59:45 +0000

struct Node
{
int data;
struct Node *next;
}var;
int main()
{
printf(“SIze of struct = %d\n”, sizeof(struct Node));
return 0;
}
Here it is printing 16.
Can someone explain how it is printing 16?

Assignment

dhanashri — Fri, 27 Jan 2012 03:24:17 +0000

completed Assignment 1

Assignment

dhanashri — Fri, 20 Jan 2012 09:28:37 +0000

updated assignment 005_21_Assignment_1