C is a general-purpose programming language
C (pronounced like the letter C) is a general-purpose computer programming language
Questions tagged [c]
490 questions
25
votes
6 answers
Source code formatter/indenter
I'm using Ubuntu 12.04. I do not have any root or sudo privileges as this is a company machine.
Is there, in a normal installation of Ubuntu 12.04, any terminal program that I can use to turn ugly malformed source code that lacks any indentation…
user9993
- 389
- 1
- 3
- 6
18
votes
5 answers
How to compile a C program that uses pthread.h?
I'm a beginner and I'm new to Ubuntu. I just installed it and want to run a C program. I have no idea what platform to use or where to write the code. I need to use the pthread.h header file in the program. Can anyone help me?
user248075
- 197
- 1
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- 3
5
votes
1 answer
How to to use gcc with LAPACK and external header file?
I am trying to run a C program that uses an external header file with LAPACK AND LBLAS libraries, every time when i try to run the program i get an error lapack not found, How do i properly use the libraries to run the program.
ubu@sanjay-pc:~$…
kernel_panic
- 11,732
3
votes
1 answer
How to implement the MSG_DONTWAIT on a recv call
I am implementing a server simulation program and want to check if anything was received via a recv from a TCP/IP socket witout waiting. When I place the MSG_DONTWAIT flag, recv returns a length of -1 and errno of "Resource temproarily anavialable".…
mjmeyer
- 31
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2
votes
1 answer
how do i run main file which function is store in another file and also the header file too?
// mainheader.h
int square(int b);
// maiNfunction.c
#include"mainheader.h"
#include
int square(int b)
{
int y;
y= b*b;
return (y);
}
//=====maiN.c file
#include
//#include
#include
…
user3793821
- 29
2
votes
1 answer
how to open a program generated binary file?
i have implemented a c program where raw packets are received from the network and saved in a binary file. Thing is i cant open that binary file. i tried opening it using terminal,but i am getting permission denied.
I used
sudo ./sniff_data.bin…
shishira
- 23
2
votes
1 answer
File formats with gcc
I wrote some c code in a file and saved it with gedit.
I then opened the terminal and tried compiling it with gcc but it gives me an error that it does not recognize the format of my c file.
What format does gcc read?
Isaac D.
- 41
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1
vote
1 answer
LINUX and C : What does it mean this condition, and how to install the required packages in order to return true
Using linux ubuntu with metasploit framework, i have a shell script which contains the following lines in the first begining of the file. At first glance i thought that i should install the the mingw32 package, so i uses the following line in…
Rafik Bari
1
vote
2 answers
Are fcntl constants in Ubuntu different from other OS?
I found the problem with my fcntl implementation in js-ctypes. I was using the wrong constant values.
Everywerhe I look though they have it different, For…
Noitidart
- 417
1
vote
1 answer
Kindly explain me this code of increment decrement operator
Following is the code that I run in ubuntu 13.10. Code:-
#include
main()
{
int i=10,j=10;
i=i++ + ++j;
printf("i=%d j=%d\n",i,j);
j=++i + j++;
printf("i=%d j=%d\n",i,j);
}
Output:-
…
Muskaan
- 13
- 3
0
votes
1 answer
The file descriptor is duplicated in the thread
My C source behaves strangely.
I use Ubuntu 14.04
I use two pthread.
And in each of pthread calls the open () and socket ().
Oddly, this file descriptor is duplicated in certain cases.
Why do these symptoms appear?
[Source]
#include…
DonBit
- 129
- 1
- 9
0
votes
1 answer
error with .data file,C
I have been trying to compile a C program that receives data from a .data file.Unfortunately,I always get the following message:
input.dat.2:1:error: expected identifier or "(" before numeric constant
I am using the 2014 version of Ubuntu…
0
votes
1 answer
Ubuntu Kernel Source Code for NAT Firewall
In TCP Communication, when the packet is being transferred from ethernet to network(IP) layer, I want to print the data present in that packet?
I am working on linux (ununtu 14.04).
I got some information that it can be done with the help of linux…
rbm
- 1
0
votes
2 answers
Newbie C programming question
Can anyone explain why the output of this code is 2? I mistakenly thought it was 3.
int array[] = {1, 2, 3};
int *address = array;
array[0] = 2;
array[1] = array[2];
array[2] = *address;
printf("%d\n", array[2]);
return 0;
jwhstman
- 3
- 2
0
votes
2 answers
Meaning of "netinet" in socket programming
What are the meanings of "netinet" and "in" in "#include " ?
user18947
- 64