data = unpack('>L', sock.recv(4))

Does this line of code means, incoming data is big endian and so unpack to endianess of local machine and assign to data. If local machine is little endian,...

I would like to convert url into md5 hash. My question is that md5 hash will create collision at 2^64. If you do long(value,16), where value is the md5 hash string, would value returned from...

I got it to work. Whoo hoo! Salem, you're C SuperMan. Thanks.

Salem, in the above code you do: (pid_t)-1, what does this do? Type cast the -1 to pid_t?
Can I run fork in a function other than main? Many example on google show it main.
Can I do parent...

On the linux terminal, I changed the permission to 770 and gunzipped. Bar contents looks good. And the permisson T disappears after chmod 770. I will quote this from this site: capital T sticky...

> There are some very strange permissions on those files. Have you been messing with the umask() function?
I didn't play with umask()
I just cut and pasted it and complied with gdb option and ran...

I ran it. But I have problem with the output file. I can't gunzip it. I changed bar.zip on the second run to bar.gz. What is cap T in permission for the file?

--wx-wx--T 1 jobs jobs 432940...

How I can get the gzipping: execl("/bin/gzip","/bin/gzip","-c","../data/data_.txt",">","./data/data.gz",0);
to work from a C-program?

I understand it now.
I am just using default Eclipse CDT...

When I run this, I get funny characters displayed continuously on my shell.

Here is my programA code:

#include <syslog.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>...

If I am only forking one process in progA and no forking in progB(just execl in method main), any reason why I need to worry about this?

Can you tell me how you do this?

For execl():

execl();
_exit(EXIT_FAILURE);

For wait() am not so sure how to do this.

If I put something below the closing } of if(pid==0), does it get executed in parent or both?
eg: while() condition and any code below while condition should only be executed by the parent.

It worked. Placing (char*) in front of 0 makes it into a NULL character?

I am getting an error when I do this in C program:
execl("/bin/cp","../data/data_.txt","../data/data.txt",0);

error is as follows:
../data/data_.txt: missing destination file operand after...

pid = fork();
if ( pid < 0 )
{
syslog(LOG_ERR,"Cannot fork!!");
exit(1);
}
if ( pid == 0 )
{ /* Child process */

execl("./myprogB",0);

thank you, that helped.

Merry Christmas

What if you want A to wait until B completes?

int file

file = open("./some.txt", O_RDONLY);

Above line file=open giving me compile error:
'O_RDONLY' undeclared (first use in this function)

What is the problem here?

I am running...

Line by line I need to get the whole content in a line from a file. I have looked at fgetc, fgets. According to fgets, I need to specify max number of characters to read.

If I have file content...

strcpy(buf, "my_id_%d_",i)
strcpy(buf1, "my_com_id_%d", j)

First I want to place value of i into "my_id_1" like so and copy to buf. And do the same thing in second line the code. Now I want to...

When you read file in C and move to next line and so on. This seems you have to access file top to bottom sequentially without skipping lines.

I need a way to read very 5th line or something...

I have a config file which includes how many files I need to create. So my program reads the config file and will create those files. Where I am stuck is I do not know before hand how many File...

I have a file pointer which was assigned in main. In the main, I just open a file to write stuff to it. I want to pass the file pointer to several functions so that they can write to the file. In...

I am looking for a good C++ example of a simple MySQL client program written in C++ and runs on Linux, using MySQL++ libraries that does the following (no threading):

Accessing Option File...

char stmt_buf[1024], buf[(1024*2)+1];
stmt_buf ="SELECT id, title FROM post LIMIT 5;";

I get an error:

connect2.c: In function ‘main’:
connect2.c:217: error: incompatible types in assignment

If you want to mail it to multiple people would you do it this way?

What is the different with have no * inside sizeof(), eg sizeof(int), vs sizeof(int *)?

I am running linux. This problem maybe implemented many times over. I am not hitting right google search term. I need a way to send email from my c program, if that program fails to excute some...

I am using Linux Fedora, gcc 4.1.2-14.

My problem is, ProgramA starts and don't know how long and when it will finish executing. But ProgramB depends on the file ProgramA creates. Easy way to...

I have a CProgramA that need to call CProgramB just before CProgramA terminates. How can this be achieved?

Part 1:
I found this on the internet. I have a question about the above quote where they mention there could be situation in which "no clock is available".

What do they mean by no clock...

I just want pass it to syslogd to do the logging in a separate file.

Can someone tell me what value would each of the line of code will have, when you go through this code:

Here is the full code:
server.conf:
interface=192.168.0.2;
log=/var/log/example;
...

I have a C program I am writing and need this program to write to syslog and have the logs in a separate file for my program.

Eg. My program is called "example.c", then I want to have a log file...

I read the doc on read, but read only takes two arguments not three in this case.

I need to create a program and have it create a lock file so that only one instance of the program can be run at any one time.

I came across this code:

for (tries = 0; tries != maxtries;...

I am looking at the code which has the following:

read(conf_fd,conf,100);

Can someone tell me what these parameters are passed to read function?

What and when you would use Decimal vs Float Type?

How do you compare two decimal numbers in python?

What is the best way to eliminate duplicates in list using sets, if you can perserve the order, it will be good?