C is a general-purpose computer programming language used for operating systems, games and other high performance work and is clearly distinct from C++. Questions about programming in C are off topic and will be closed or migrated. Consider asking your question at Stack Overflow instead.

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Changing the Interrupt Vector Table [migrated]

During one of my university lectures we were talking about hooking and the possiblitity to change the interrupt vector table (IVT). Our professor said that a program with root permissions is able to ...
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Where can I get Unicast, Multicast, Broadcast and Discard Packets Sent and Received via a particular interface in Unix systems?

I have created several interfaces on my Unix machine for communication to the external world. Now I need to get the count of various packets Sent and Received via each interface. I have already ...
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1answer
32 views

Unknown option -pthread in LD

This is a follow up from this issue on Github. Basically, on OS X El Capitan, I get this message: ld: unknown option: -pthread clang: error: linker command failed with exit code 1 (use -v to see ...
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19 views

libcurl version 7.21 to work on Redhat 6

I am having an issue with libcurl version 7.19 and socks proxy on redhat 6. I believe it was fixed in libcurl version 7.21 how do i upgrade libcurl on redhat 6 to 7.21 or greater?
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57 views

Clion formatting code differently (comments aligned in a column)

Question is about Clion. I don't have enough reputation to put the tag in the question's tags. I have 2 things I need, in order to format code in a different way in Clion, and I can't figure out how ...
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23 views

How can I recover my c drive after downloading SQL Server 2014 Express with Tools?

I downloaded SQL Server 2014 Express with Tools went through the entire process but the install file file kept running as if in a loop. I uninstalled the programs and affiliated drivers and now I keep ...
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53 views

how is envp argument passed to execve system call?

Suppose I call int execve(const char *filename, char *const argv[], char *const envp[]) where I malloced memory for envp, then how does the program filename access the contents of that array when ...
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1answer
65 views

The “other” finger (GECOS fields at /etc/passwd)

in the file /etc/passwd we have the so called GECOS fields (which stands for "General Electric Comprehensive Operating System"), that is: username:password:userid:groupid:gecos:home-dir:shell ...
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1answer
49 views

openSSL Key and Certificate

As far I know, in an authenticated SSL connection, both the client and server have private keys and provide their certificates (with the corresponding public keys) across the connection before ...
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41 views

prevent asl message to show up on /var/log/system.log

I'd like to define new asl facility in my project, and use it to generate asl log messages that wouldn't show up in /var/log/system.log (but only in the my pre-defined log file) here's my entire asl ...
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2answers
45 views

Can I sandbox a binary created in C (with GCC) for Linux and make it easy for users?

I have compiled a binary that I want to distribute to other people. It's closed-source, but I want to provide users of the binary with confidence that it cannot possibly access the internet, ...
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29 views

pnmtopng on large file

I am running pnmtopng on a 101M, 3000x4000 pixel PNM file. I get the error pnmtopng: ASCII decimal integer in file is too large to be processed. every time I run it. I looked through the source and it ...
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34 views

Why do these benchmarks NOT saturate the CPU.

I ran two trivial benchmarks in Powershell and C. I ran this on reasonably well endowed i7-2600 with 16 Gig Win 7 Pro. Both ran using two of the 8 cores (really 4 cores dual hyper threaded) and ran ...
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34 views

Building software on Arch and finding the dependency

I'm relatively new to compiling software. I downloaded a package called gr-scan which uses gnuradio and osmosdr (I have both installed and working via pacman already). The instructions say to edit the ...
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1answer
44 views

How can I add a flag in PostgreSQL source code that works in both frontend and backend?

I'm trying to do some changes to postgresql source code. I want to add a flag that works in both frontend and backend. Here is what I have done so far. 1- I created my header file mine.h in which I ...
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1answer
32 views

How can I program and debug c code on Fedora? [closed]

I know that in order to compile c on fedora I need to use gcc, but what about debug? How can I debug c on Fedora? What IDE can I use?
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1answer
70 views

C programs stuck

After installing windows 10 a couple of month ago i tryed to run a very simple C program, firtsly in Visual Studio 2015, and the entire IDE froze. Then I tried compiling via command line. The build is ...
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2answers
49 views

What is the difference between working on a machine and doing the same task over ssh?

I have been working at University on a local machine which is on a server that I have access to. I have some c code and am able to carry out parallel runs of the code as expected. However when I ...
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1answer
176 views

DD-WRT calling web service from Arduino ESP8266

I am looking for a way of finding out what devices are currently attached wirelessly to the router thats running DD-WRT firmware. Problem is that I am unable to find any references to a REST API or ...
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2answers
115 views

Upgrading gcc for a specific user account

I work on a computing cluster running CentOS6/RHEL6 that I share with ~100 other users, overseen by a single IT admin. Recently, I started writing in C++, and some of my code depends on C++11. ...
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31 views

Slow IPC in 4000+ processes

I have an multiprocess application that is dependent on IPC calls. We have around 4000+ processes running. Currently we upgraded the system to RHEL 6.4, and now are observing that IPC calls msgrcv() ...
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1answer
32 views

Setting up quarantine environment on Linux or Mac

How can I setup an quarantine environment so that I can test my codes or programs which can fork any number of times? I was trying this on Mac and if I have a fork in a while loop which is not ...
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1answer
27 views

A Linux Distribution w/ Version which contains Sendmail version 8.6.9

I'm looking for Sendmail version 8.6.9. What distribution (I don't think that matters) or version of said distribution contains the old 8.6.9 version of sendmail. If I'm going about getting that ...
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170 views

build numpy from source results in wrong architecture

I build numpy from source on my mac to link it to my ATLAS library. Thus, I wanted to run it as described here with these options: export MACOSX_DEPLOYMENT_TARGET=10.10 export CFLAGS="-arch i386 ...
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151 views

BASH script that generates a header file with function prototypes

I am doing a C project which involves lots of static linking. To get rid of "implict function declaration" errors I will use a simple solution - a header file with function prototypes. I wrote this ...
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110 views

Reset BT adapter through software on linux

I'm trying to reset the Bluetooth adapters using HCI sockets (in C) /* Open HCI socket */ if ((ctl = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI)) < 0) { perror("Can't open HCI socket."); ...
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1answer
82 views

Does a better/newer C or C++ compiler produce more performant compiled code? Or do they just perform faster/better while compiling?

I am not a C or C++ programmer myself, but I often use software that needs to be compiled or otherwise depends on a compiler, like some R packages. Will that software actually perform better if I use ...
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189 views

How can I use older gcc headers?

I installed gcc-3.4 to Debian 7.8 and create symbolic link /usr/bin/gcc. When I typed gcc --version I get: gcc (GCC) 3.4.6 (Debian 3.4.6.-9) Then I wrote simple C program. #include ...
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14 views

How can I know if SNMP Walk or a Table-View is started?

Hello how can I know if a User has "sent" a SNMP-Walk or a TABLE-VIEW request to a device with UCD-SNMP/NET-SNMP and custom coding?
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2answers
122 views

Copying Unix Executable File content from file to file

I am simply experimenting but have found a phenomena that I would be very appreciative if someone could try to explain. I write a simple Hello World program in C. Use gcc to compile this program into ...
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3answers
465 views

How to keep the terminal open after executing a C program?

I'm trying to run a C program from within a python code. cmd = 'gnome-terminal --command=./myprog' subprocess.Popen(command, stdout=subprocess.PIPE, shell=True) The code executes and the terminal ...
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199 views

make a c program run without opening a cmd window [closed]

how can i make a c program run without opening a CMD window, i tried -mwindows flag, used WinMain Entry instead of main, but without results, the cmd still pop up. i tried ShowWindow function by ...
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230 views

How to change the default terminal beep frequency of the PC speaker?

I want to change the default sound frequency ofSND_BELL(which is used when\aor BEL or ^G is printed on the screen) to higher values (the current default is around 750Hz). Of course this turn to need a ...
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70 views

How to measure the latence time of each level of cache memory [closed]

I want to measure the size of each cache memory level (L1, L2, L3) and its latency time. I am using a C program that takes 3 parameters: the size of an arrays that will be read, the number of times to ...
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1answer
63 views

How to prevent GNU indent from breaking initialization assignment like “= { 0 };”

See following example. $ indent --version GNU indent 2.2.10 $ cat foo.c void foo() { struct { int a; int b; } v = { 0 }; } $ indent -st foo.c void foo () { struct { ...
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1answer
261 views

“cannot open port!” in a DLL project [closed]

I made a C Console Application in Visual Studio in order to access one of the COM ports with the following code and all went well. #include <windows.h> #include <stdio.h> #include ...
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1answer
137 views

Which GUI framework is used to make Ubuntu?

I'm interested to know, Which GUI framework is used to build ubuntu? As well i know it is built in C/C++. But what GUI is used to make Ubuntu? Help would be appreciated!
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1answer
64 views

How do I install programming info pages in Mac OS X?

I used to have a Linux system i was able to type info libc to view info pages on the C library, including unix functions. However, now I am running Mac OS X this does not work. How do I install the ...
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96 views

Linux C Compiler

I've just tried to install APCUPSD and have run into a missing C compiler error. I then ran yum install compat-gcc-34-g77 which went fine but the error did not go away, I tried which gcc as well ...
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3answers
17k views

username is not in the sudoers file. This incident will be reported

I am running ubuntu 12.04 on my laptop using VMware Player. I am not sure why but I have an account called "User Account" in addition to my account that I usually login to use ubuntu. Well that was ...
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1answer
233 views

How to delete a particular line in a text file after some operation on that text file at the same time

I am perl bginner (but i guess logic is same for all programming languages like C++ and C in my case its perl). What i want to achieve ? I have a text file i read that file which contains different ...
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2answers
1k views

How to remove password of PDF with known password? [duplicate]

I have a personal PDF that I would like to remove the password for because the password was my old phone number (which I may forget). How can this be done? Maybe relevant that the PDF contains form ...
2
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1answer
677 views

Geany comment block format

I'm trying to figure out where the comment block style is defined in Geany for C files. By this I mean when I select a block of text and hit ctrl-e, each line in the block of text is pre-pended (at ...
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32 views

Access remotely two computers via IPv6 [closed]

I have a little problem on my house. Recently, I installed Teredo on two computers using sudo apt-get install miredo. Now I can access my two computer via IPv6 using Sockets in C. My goal is: I am a ...
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2answers
381 views

Unable to compile GTK+ application

I'm trying to compile a simple GTK app for testing on a Trisquel 7 machine. The packages are derived from Ubuntu 14.04 LTS. I have libgtk2.0-dev installed, but when I try to compile, this is the ...
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1answer
52 views

Running native applications on the Linux Kernel

When the Linux kernel has loaded it loads the distro or OS to take over, how can I make the kernel load some native application (written in c) instead? I don't need a GUI or anything, Instead I want ...
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631 views

Windows : How to protect process from getting killed in C/C++ [closed]

Is there any "GODLY" method through which i can protect my process from getting killed either from: 1>Task manager 2>Command prompt -- forcefully kill Things i tried : 1. Hooking Open Process and ...
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1answer
407 views

How to create a local server to compile and run programs in C, Java,..etc [closed]

How can I create a local server on my Ubuntu laptop which is able to compile and run C, Java, Ruby, Python, etc code? And I want to use that service from my tablet through WiFi.
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114 views

C/C++ functions tag for Geany [closed]

I want to generate the C/C++ functions tag for Geany like those that included in the archive, how I can do that. I want to get auto completion when entering a functions name. Thanks in advance for any ...
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1answer
40 views

Executing a c operating system inside VMWorkstation [closed]

I am planning on starting development a small, simple operating system, however I am unsure about a starting point.Would running the code inside a VM without a OS in it be the best approach at ...