Code:
char retBuffer[100];
recv(sock , retBuffer ,sizeof(retBuffer) , 0);
if i send a string smaller then my buffer size retBuffer always have garbage of the end of it....what can i do to eliminate tis problem ?
I was wondering if it is possible to have a garbage collector in C, and would it be too difficult to create?
View 1 Replies View RelatedI'm interested in writing a generational garbage collector in C++. This is for a Python-like programming language project. I have used Boehm's garbage collector before, but I'm worried that it will have noticeable pause times (unacceptable for interactive programs). Since I can't really find any other C++ established GCs out there, I have been thinking of simply writing my own.
However, there are two essential ingredients I need for this:
- Some kind of write barrier mechanism that will notify my collector when something is written to a part of the heap
- A way for me to know the addresses and sizes of the stack, heap and global storage (the root sets)
how to implement write barriers (and how to get the stack, heap and global storage information) on the Linux platform? As an alternative, if you know of C++ GCs other than Boehm, I would also be interested.
I actually have two reasons for posting this. One is to see if there's an actual name for characters like this:Hopefully that will show up correctly for you. If not, it's a little box with four numbers in it, one in each corner. I don't know their name or their reason for showing up, so it's hard to look for help.
My main problem, though, is that I wrote a program that prints some output to a console using ncurses as it runs. These characters show up on the console, seemingly at random, and disturb the whole thing. Sometimes I'll also get sets of characters like "[13;" I'm not printing anything bizarre on there, just strings and floating-point numbers.
The code below prints garbage if I use puts() but it is fine if I use printf() instead (see sample of output at the bottom of this post). The odd thing is that the mess always starts after exactly eight properly printed characters. That sort of regularity can't be a coincidence, can it? It almost looks like an encoding issue (I'm using UTF-8) but if it really is, then I don't understand why the printf() is unaffected.
Code:
#include <stdio.h>
#include <string.h>
const char *nChars (const char *, int);
int main (int argc, char * argv[]){
char * name ="Count Dracula++";
int len = strlen(name);
if (argv[1] == 0) argv[1]="printf";
printf("--->%d characters", len); .....
Code:
#loop until there are no more files
while [ ${#files[@]} -gt 0 ]; do
for num in `seq 1 ${#files[@]}`; do
wurd=`tail -4 ${files[$num-1]}`
[code].....
Everything works.. but when it has to unset.. it breaks.. it doesnt give an error though.. it just jams the program.
I read this guide: [URL].. but I still don't understand how to make objects created with new garbage-collected. Could someone explain how or find a link to an explanation?
View 13 Replies View RelatedI use tcl-expect script to ssh to the server. How can I eliminate the first 2 lines if using system(./script.sh) to execute it, as the default output will be shown on shell and the first 2 lines are included.
Essentially I just want to have the "ps" result, not the login process. code...
Greetings EveryOne
how to check if buffer is empty in c?
writing a code in C program for debugging error and sendingror messagein routingprotocols. please answer with code
View 2 Replies View RelatedI wanna capture network packets from DMA ring buffer, just like netfilter. i wanna capture it from DMA, because i wanna get MAC address of I/O packets, so netfilter not included MAC address of out going packets because its on IP level and Ebtables is like that too. how i can capture network packets from DMA ring buffer.
View 9 Replies View RelatedI add new syscall, and it need copy big data into the buffer specified in user mode. How can i do it? use copy_to_user? or can i use memcpy directly? If i use copy_to_use, is it low efficient?v
View 2 Replies View RelatedI have been developing some code which I have been testing an another i386 system. However I have been getting some weird data received on a socket I am communicating with some 3rd party hardware, I have opened a socket to read data on the hardware's telnet port. The data being read is as expected and my code appears to function correctly.
However I have now began testing the code on a target platform, this platform is of a better spec than my development system. When I read data from the socket using recv(), all the expected data has not been read.A chunk of data from the beginning is missing and a portion of data that would be at the end is now at the beginning of the buffer. I'll try and illustrate this below.
[Code]...
As subjected I have this warning message code...
How can I get rid of this warning message?
The algorithm for reading and writing disk blocks use the algorithm getblk to allocate buffers from the pool. In the algorithm getblk, if the kernel removes a buffer from the free list, it must raise the processor priority level to block out interrupts before checking the free list. Why ?Where can i find the C implementation of the above algorithm for buffer allocation in the linux source code ?
View 1 Replies View Relatedcreate a large buffer in my program so that I can send, and then receive on another pc, more than 4096 bytes (this seems to be the default for the serial port). I thought this might work:
[code]...
I just installed Fedora 12, I have Linux Cetified Machine (got it in 2004). The backgorung noise is something that I didn't have before; my previous installation was Fedora 8. how to eliminate the background noise.
View 4 Replies View RelatedHow do I eliminate the "TrashPail icon", and the "Computer icon" off the desktop..? I likes and needs a clean desktop, to display pix-edits, so there isn't anything pulling away the focus from the pix... It's a bit of a nightmare having a pix of a garbage-pail in ones face when the artist is trying to focus on the fine quality of his artistry...
View 4 Replies View RelatedI am familiar with bash, but my works require csh. in my .cshrc, I created this alias:alias cd 'cd !:1; ls -l' It works very well except for one case: when I cd without any parameter:
cd In which case, I get the "Bad ! arg selector" error. How do I eliminate this error?
when i installed the fcitx, strange things occurred,there are blank boxes every time i type using it.
And i found this link [URL] might be useful and i did what it suggested,nevertheless ,it did not work as i expected.
Very often I have to leave my computer for a few minutes while in the process of downloading files, or just to get a cup of coffee, and when I come back, I have to re-enter my password to continue. This level of security is unnecessary since I am the only one here, and there is no danger of anyone ever messing with my PC. How can I eliminate these annoying login requests? One reason I am trying to get away form Windows is to have the computer do what I want, and not what other people think I want. I have been experimenting with various Linux OSs and several versions of Ubuntu, and this is an annoyance in every one I try.
View 6 Replies View RelatedI have Radeon HD 3870, which is limited to 2D purposes I understand...
Will this mean that I cannot use DRI? Will it have a performance impact in 2D applications?
Does DRI make watching movies on PC 'better'? Especially 720p ones.
I have a few problem. I have a txt file that convert from pcap to txt file. What I want is to eliminate unwanted text from my txt file. Here is the example of the what I want to do:
This is original file in txt file
Quote:
No. Time Source Destination Protocol Info
1 0.000000 158.27.22.66 61.39.220.82 HTTP Continuation or non-HTTP traffic
0000 00 1f 9e 1a 5b 00 00 21 55 84 9a ff 08 00 45 00 ....[..!U.....E.
0010 05 8c e4 14 40 00 36 06 8d 1c 3a 1b 16 42 a1 8b ....@.6...:..B..
0020 dc 52 00 50 05 12 18 d4 17 f0 64 3f b0 94 80 10 .R.P......d?....
[Code].....
My root partition /dev/sda1 is 24.41 GiB with 10.48 GiB used. How can I tell if I have inadvertently placed a bunch of garbage on this partition? Also, should I, and I use the term loosely, 'move' certain directories to my home partition /dev/sda3? (118.77 GiB with 3.14 GiB used)
Right now I believe that, rightly or wrongly, if I screw up my system, all I need to do is install my Clonezilla image back to /dev/sda1 and I will have a 'mostly' working system. If I 'move' anything out of /dev/sda1 to /dev/sda3, will this hold true? Or am I out to lunch on this assumption anyway?
I've sucessfully installed Fedora 11 into a SunVirtualBox machine, but I would like to elimate from the boot sequence the GUI Startup. If I need it I could invoke the GUI from the command line. How I coud get this?
View 5 Replies View Relatedi want to have my desktop clean but i used Fedora 13, and i want to eliminate computer and home folder from my desktop. How i do that?
View 2 Replies View RelatedWhenever I login to a certain server using SSH I get a very long delay before a prompt appears. Everything I looked up on this issue says that it's a DNS issue and that I should disable reverse DNS lookups on the server.
But, the remote server is a shared webhosting server. I e-mailed the sysadmins but they say they have no DNS issue and that they won't change the server configuration. So, how can I fix this issue from my side (client side)? I have a static IP address and a hostname that points to it.
I'd like to eliminate anything unnecessary from my Ubuntu Server box (on a Compact Flash IDE drive) and set it up to boot into RAM. I've seen ways of getting a live CD to do this and seen other distributions that are designed to do this, but since I'm familiar with Ubuntu, I'd like to be able to get rid of my swap space and make the existing installation boot to RAM.
View 2 Replies View RelatedI don't need password protection, I don't have it on Windows 7 for any acct, and also don't want it on linux.However, as a non-tech person, I couldn't eliminate this requirement.I tried inputting an easy password to minimize inconvenience but was warned it was either "too short" or "too simple".
View 1 Replies View RelatedI have a Macbook running Ubuntu Karmic and I have been asked to DJ (amateur to the MAX) a friend's wedding next weekend. I don't have the coin to spend on a Mixer so I can run my mic and laptop through my amp so I figure I'd just run the Mic into the mic input on my Macbook and let the laptop do the mixing for me.Well, I added the loopback module to Pulse and inserted a command to have it auto start:
Code:
pactl load-module module-loopback
Code:
[code]....