The UNIX and Linux Forums - High Level Programming

ways to eliminate zombie

Gopi Krishna P — Sat, 28 Nov 2009 06:06:50 GMT

what are the precautions to be taken care for avoiding zombie process ?

How to use we use int64?

macroideal — Fri, 27 Nov 2009 09:14:34 GMT

Recently my project needs int64 variables. However my os and computer are both 32bits.
So how can i use int64 as a parameter in a function.
and is int64 a structure as user-defined structures.....
???
thanx
i am waiting for ur answer:rolleyes:

c executing shell problem

velniaszs — Fri, 27 Nov 2009 06:45:57 GMT

Hello
im geting error here:

Code:

#include 

#include 

using namespace std;

int main (int argc, char *argv[])

{

char user[20];

string command;

 cin << user;

command = printf ("grep '%s' /etc/shadow", user);



system (command.c_str());

 }

 return 0;

}

it should search shadow file for a entered user, but it shows "sh not found"

Xlib mouse events and ButtonPressMask

abhinav.zoso — Fri, 27 Nov 2009 06:12:48 GMT

I have written a simple program which will report key press and release events for a particular window. In my case, it is mostly the terminal since I invoke the program from the terminal. I am able to get the key press and release events taking place in the terminal window (I have used XSelectInput() with KeyPressMask and KeyReleaseMask on the terminal) but the same is not working with ButtonPress and ButtonRelease. Not just these, but any events related to the mouse are not being reported. Any idea why this is happening?

Code:

#include

#include

#include

#include

#include

#include



int main() {

Display *display = XOpenDisplay(NULL);

KeySym k;

int revert_to;

Window window;

XEvent event;



XGetInputFocus(display, &window, &revert_to);

XSelectInput(display, window, KeyPressMask | KeyReleaseMask | ButtonPressMask | ButtonReleaseMask);



while(1)

{

XNextEvent(display,&event);

switch (event.type) {



case KeyPress : printf("Key Pressed\n"); break;

case KeyRelease : printf("Key Released\n"); break;

case ButtonPress : printf("Button Pressed\n"); break;

case ButtonRelease : printf("Button Released\n"); break;

case EnterNotify : printf("Enter\n"); break;

}

}

XCloseDisplay(display);

return 0;

}

Help for coding this programme

allyjaah — Thu, 26 Nov 2009 18:58:15 GMT

for a floating-point array x whose size is n, find the geometric mean..

GM =n x1.x2.x3...xn

Attached Images

untitled.bmp (273.1 KB)

Client socket

johnbach — Thu, 26 Nov 2009 09:23:47 GMT

Am trying to connect to local machine on port 9102
There is no server application listening on port 9102.

Code:

if (connect(fd,(struct sockaddr *)&addr, (socklen_t)sizeof(struct sockaddr)) == -1)

   return -1;

 cout<<"Connected ,ERRNO:"<<errno<<", txt:"<errno);

Code:

netstat -na |grep 9102

tcp        0      0 192.168.151.42:9102         192.168.151.42:9102         ESTABLISHED

And the o/p

Code:

Connected ,ERRNO:42, txt:No message of desired type

Any suggestion?

Make error

X-Or — Mon, 23 Nov 2009 03:23:18 GMT

Hello,

Is someone know why this generate an error :

Code:

all:

    dt = $(shell date)

    echo "$(dt)"

Beginners question about fork

edgarvm — Fri, 20 Nov 2009 00:50:21 GMT

Hi everyone:

I'm developing a dynamic library for notifications, this library is used for a daemon that i've programmed, when something goes wrong the library should send an email to an administrator, but since sending an email is a non-vital process then it can fail (it should work as an asynchronous process) so i'm considering to do that by using the fork function, however the entire process of daemon will be forked and i would be responsible for destroying the child process, so my question is, does exist any way more efficient to do this?

thanks in advance

stat64 support on 32bit platform

guru13 — Wed, 18 Nov 2009 16:18:21 GMT

I have to get the size and ownership of a file on a 32 bit solaris 10.stat function fails to provide the information as the file size is greater than 2GB(26GB).Is stat64 supported on 32 bit platforms.Can i use the function on all the platforms

Test Coverage - executing this code

Jakeman1086 — Tue, 17 Nov 2009 22:23:12 GMT

Hi,

I am trying to gain test coverage on the 'fold' program in unix and am having difficulty executing the following code:

Code:

if(ferror (istream))

{

        error (0, errno, "%s", filename);

        if(!STREQ (filename, "-"))

                fclose (istream);

        return 1;

}

if (!STREQ (filename, "-") && fclose (istream) == EOF)

{

        error (0, errno, "%s", filename);

        return 1;

}

How could I cause an error to occur in the input stream using the fold command in the command prompt (i.e. fold < input).

Thank you!

Unicode programing in C

broli — Tue, 17 Nov 2009 20:25:14 GMT

im starting to go a little serious with c, woking in a personal project that will read a xml, which might contain Unicode characters (i know it will on my system, which is set to es_AR.UTF-8)

im using mxml, and the documentation says it uses utf8 internally (no worries here).
so i need to be sure im using utf8 in my program. to be sure that i can safely interact with mxml and to be sure my program will work in all languages.

i have been reading alot, but i dont quite fully get how i can accomplish this.

im going for something simple, something easy that wont demand much of me.

my program will read user input (from cli for now, gtk later), and will save it in xml (is a config file for other app). it will also have the option to read a xml, and use it as a base for a new one

now, i have a few concrete questions.
a) do i have to use a special type of variable?
if a) is true, then i need a hole new set of functions? (for strcmp, or strstr)
b) can i work with unicode characters using char *?
if b) is true, how do i "make" them utf8?
c) is a mix of the above? then how to choose the mix ratio?

i appreciate any help, manual, link, ect that can help me understand how this works. (that includes source code)

thanks

cc -- Unsatisfied symbols -- on HP-UX 10.2

Dirk_ — Tue, 17 Nov 2009 16:25:50 GMT

Greetings,
I am slowly learning a few things but am far from being an expert. I am at the point now that I
would like to be able write some ANSI C code on HP-UX 10.2. Just a hobbie... I am just using cc,
which came with the HP-UX 10.2 ...
I don't have the manuals for the development environment...
Anyway, I have the following sample code that illustrates that I am missing a library file
when cc attempts to link??? That is the conclusion I have come to.
I have looked through man pow, and man math and have not found the information I am looking for.

I am not sure 1) which library file is missing and 2) the syntax I need to use to poperly compile
and link in the object files.
Following is sample code that illustrates the issue I am having with cc
Thanks in advance,
Dirk

Code:

$ uname -a

HP-UX green B.10.20 A 9000/782 2015827886 two-user license

=========

cat ex4_6.c

#include 

#include 

 

 

main ()

{

float polyresult;

polyresult = 3 * powf(2.55, 3) + 2 * powf(2.55, 2) + 6;

printf("the result is %f\n", polyresult );

 

}

 

 

$ cc ex4_6.c

/usr/ccs/bin/ld: Unsatisfied symbols:

powf (code)

DOM query selected path and show as xml

penyu — Tue, 17 Nov 2009 11:35:11 GMT

First, I am sorry if this question not this room scope,

I have a XML file :

file: book.xml

Code:











  Everyday Italian

  Giada De Laurentiis

  2005

  30.00







  Harry Potter

  J K. Rowling

  2005

  29.99

I using this script If I want to show output of my script as xml file:

Code:

Now, I want to select specific path of XML node. The output that I want is like:

Code:







  Everyday Italian

  Giada De Laurentiis

  2005

  30.00

and this is my script:

Code:

Unfortunatelly, the script totally error. I dont know how to fix this. :(

Could you somebody please tell me how to print output only selected path criteria as xml?

Your answer really appreciated,

Thanks,
Denny

String copy in C language

tqlam — Mon, 16 Nov 2009 17:18:46 GMT

Hello,

I have a text file (FILE.txt) that contains the following information:

userAxxx.name@email.com userA
userBxxx.name@email.com userB
userxxCx.name@email.com userC
and more....

in scripting, I can easily do a grep and awk to store an email info into a string variable as following:

EMAL=`grep userA | awk '{print $1}' FILE.txt`
or
EMAIL=`nawk '$2 == "userB" {print $1}' FILE.txt

BUT, how do I translate above into C language?

I'm new in c programming and very appreciate for your help.

Thanks so much,
tqlam

how to execute the sql quires from shell script?

vij_krr — Mon, 16 Nov 2009 05:56:11 GMT

hi all,

I'm new to shell scripting, i want to know how to use the sql statements from the shell script? is there any documents or pdf to learn from the begining? plese provide me some useful links on the same.

Thanks all in advance..,:b: