C is a general-purpose computer programming language used for operating systems, games and other high performance work and is clearly distinct from C++. It was developed in 1972 by Dennis Ritchie for use with the Unix operating system.

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214
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4answers
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Why is FreeBSD deprecating GCC in favor of Clang/LLVM?

So I was surfing the net and stumbled upon this article. It basically states that FreeBSD, starting from Version 10 and above will deprecate GCC in favor of Clang/LLVM. From what I have seen around ...
6
votes
4answers
18k views

How do I kill all a user's processes using their UID

I want to kill all running processes of a particular user from either a shell script or native code on a linux system. Do I have to read the /proc directory and look for these? Any ideas? Is there a ...
39
votes
3answers
24k views

What are pseudo terminals (pty/tty)?

This might be really basic question but I want to understand it thoroughly. What is a pseudo terminal? (tty/pty) Why do we need them? How they got introduced and what was the need for it? Are they ...
9
votes
10answers
3k views

Development environment for C

Looking for ideas on setting up a convenient and productive development environment for C development. I found C editing with Vim very helpful but I would like to get a wider sampling of suggestions.
20
votes
4answers
6k views

How to dump a binary file as a C/C++ string literal?

I have a binary file I would like to include in my C source code (temporarily, for testing purposes) so I would like to obtain the file contents as a C string, something like this: \x01\x02\x03\x04 ...
4
votes
1answer
2k views

Sparse files/file holes and unexpected block size

For my own learning, I've been playing around with creating files with file holes. I created a util that simply reads from stdin and writes to a file, but before writing to the file, it uses lseek to ...
7
votes
1answer
3k views

/dev/tcp not present in Linux

I am porting C/pro*c code from UNIX to Linux. The code is: #define __NFDBIT (8 * sizeof(unsigned long)) #define __FD_SETSIZ 1024 #define __FDSET_LONG (__FD_SETSIZ/__NFDBIT) typedef struct ...
4
votes
2answers
919 views

How to adjust time command to measure a program elapsed time

I'm trying to get the time that my program takes to finish (aka elapsed time) so I'm using the common time. What I get by doing this is 3 measurements: user, system and total. This is fine but I ...
6
votes
2answers
6k views

How to find the header file where a c function is defined?

Is there an easy way to find out which header file a C function declaration is in? cding into /usr/include and running (grep -E 'system.*\(' *.h -R) works with some trial and error, but isn't there an ...
4
votes
1answer
3k views

Start 4 programs on startup in Linux Mint via terminal

I'm working on a project and I hope you can help me solve a problem. I have four programs that are written in C. They have been compiled using gcc and they work as they should. Because the four ...
4
votes
2answers
857 views

How to create GUIs (such as menuconfig) with lxdialog

I try to generate a menuconfig by my own with the help of lxdialog (source: lxdialog). Unfortunately this is not so well documented as I wished for. Example: So what I did: I included these files (...
2
votes
2answers
1k views

USB Driver Compilation Error

I'm currently trying to compile a Linux USB UART driver, which is provided here: http://www.exar.com/connectivity/uart-and-bridging-solutions/usb-uarts/xr21v1410 The driver consists of 2 header files ...
1
vote
2answers
465 views

Linux System calls in C on OSX

So I did a quick test and #include <sys/types.h> #include <unistd.h> #include <stdio.h> int main (int argc, char *argv[]) { printf("Hello World\n"); printf("%d\n",...
1
vote
4answers
3k views

I can not get my Realtek 8723 driver source compiled

I have a Lenovo IdeaPad Yoga 13. WLAN won't work out of box with fedora 18. So I googled around and found this 2 links: http://askubuntu.com/questions/139632/wireless-card-realtek-rtl8723ae-bt-is-not-...
0
votes
4answers
8k views

/usr/ucb/cc: language optional software package not installed

I tried to compile some C code to get object file from a shell prompt: $cc a.c But this gives me the following error: /usr/ucb/cc: language optional software package not installed How can I ...
-1
votes
2answers
140 views

Why rsh not opens and reads PAM modules and limits.conf?

I am working on a project, that uses rsh utility for remote connection. But my project needs some extra features for that, so I add that features. Till now, all the things are going fine. But when I ...