hi! everybody i have a c problem can any one help me . i wrote a code of process creation in c language , it uses pid & fork() call. the fork call is use for making child process now can any body tell me how to make parent process? i know that creating a child in process make the process parent automatically but i want to make a parent ...
Hello all, this is my first post here. I want to access the whole hard disk directly from a C program. There's no FS on it and never's gonna be one. I just want to open /dev/sda (for example) and do I/O at the block/sector level of the disk. I'm planning to write some programs for learning C programming in the Linux environment (...
HI.. I want an example of how to implement FSM using function pointers in C. ...
I am trying to test the action of semaphores by calling them in my program with manual switches. I have the functions ready to go, but am failing to codinate them during the calling. I using UNIX system. Please NOTE: the function defitions are fine, put them here for quick refence.The problem is with the caline below these function. I wi...
Hallo, I'm looking for a really simple and easily hackable tar library for C or C++. Ideally it should have a permissive license (BSD/LGPL) and not have a ton of Unix/Windows OS dependencies, as I plan to use it from an embedded RTOS... Any ideas? ...
The OS I'm working on (IBM CNK, which is not Linux, but somewhat POSIX-compliant) doesn't allow me to simply create a new file or directory in /dev/shm using fopen() or mkdir(), respectively. It looks like I have to use shm_open() to get a file descriptor and then fdopen() to use the shared region for file I/O. Do I need to set the siz...
My program is working perfectly, but this was achieved through trial and error; I am trying to get a grip of how things really work from first principles. I will be grateful for any explanation. What is this function communicating with the hexadecimal values? for (i=0; i<5;i++) { cd=(int)(((numpairs[i])&0xf0)>>4); if((numpair...
Hi I want to generate sequence of hexadecimal numbers starting with 07060504003020100. Next number would be 0f0e0d0c0b0a0908 etc in that order. When i use unsigned long long int and output the data first 4 bits ie 0 is truncated. and it prints 706050403020100. So i was thinking of puting the number into a char array/buffer and then pr...
I have written a program which writes a list of data to a '.dat' file with the intention of then plotting it separately using gnuplot. Is there a way of making my code plot it automatically? My output is of the form: x-coord analytic approximation x-coord analytic approximation x-coord analytic approximation x-coord ...
Hi, I am trying to understand array declarations, constness, and their resulting variable types. The following is allowed (by my compiler): char s01[] = "abc" ; // typeof(s01) = char* const char s02[] = "abc" ; // typeof(s02) = const char* (== char const*) char const s03[] = "abc" ; // typeof(s03) = char const* (== const char...
I have declared a char variable ope in function main. i took the input through getchar function and stored in ope. Now i want to blank the variable so i will be able to store some other in ope. Can anybody show me how to do it?? I just want to continuously store the input in ope variable. If it's possible through some other way, kindly g...
I'm trying to find out how to remap memory-mapped files on a Mac (when I want to expand the available space). I see our friends in the Linux world have mremap but I can find no such function in the headers on my Mac. /Developer/SDKs/MacOSX10.6.sdk/usr/include/sys/mman.h has the following: mmap mprotect msync munlock munmap but no mre...
For my C projects I'd like to use curly brackets based configuration files like: account { name = "[email protected]"; password = "test"; autoconnect = true; } etc. or some variations. I'm trying to find some nice C libraries to suit my needs. Can you please advise? ...
The following code is supposed to make 100,000 threads: /* compile with: gcc -lpthread -o thread-limit thread-limit.c */ /* originally from: http://www.volano.com/linuxnotes.html */ #include <stdlib.h> #include <stdio.h> #include <unistd.h> #include <pthread.h> #include <string.h> #define MAX_THREADS 100000 int i; void run(void) { ...
I have a #define PROT_EN_DAT 0x140 //(320 in decimal) Its loaded into 64 bit value register(ex setup_data[39:8]=PROT_EN_DATA) Now i want to put this value(0x140)into uint8_t bRequest uint16_t wValue uint16_t wIndex How can load the value so that i don't have to manually do it for other values again. I think we can do...
Hi, I am unable to understand or grasp rather; what it means to program at a lower layer in socket programming. I am used to working with tcp/udp/file system sockets. These are all wrapped around their own protocol specifications ... which as i understand would make it working at the application layer in the stack. In the project i am ...
Is there any code editor (like eclipse or visual studio) that works on mobile phones (such as nokia 5800)? So what I want is to edit my C/C++/C# code on my phone. (I have Nokia so it is my primary intrest, but I am also interested in other phones such as Android based ones.) I do not need ability to compile, but I'd love codehinting an...
i am having 12 equations and 12 unkonwns... i want to solve these equations. please help me with software or package or source code. ...
I'm writing a program for a school project that is supposed to emulate the Unix shell, in a very basic form. It's basically parsing input, then doing a fork/exec. I need to be able to read arguments in the program (not as arguments passed to the program from the command line) individually. For example, I will prompt: Please enter a com...
Hi, I wanna to write something to a .txt file in .c file, but required to name that file with the current timestamp as the postfix, just like filename_2010_08_19_20_30. So I have to define the filename char array first and process the filename by myself?Assign the character one by one? Is there any easy way to do that? ...