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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ioctl: invalid argument for HDIO_GET_IDENTITY

I wrote a program to get the details of hard disk drive using HDIO_ ioctl calls. For writing program, I'm referring Documentation/ioctl/hdio.txt in kernel source(2.6.32). Here is my main part of ...
2
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1answer
158 views

Bash shell launched by forkpty() spawns child processes that ignore SIGINT. Why and how do I ensure SIGINT is not ignored?

I have a C program that uses forkpty to execute a bash shell. I'm finding that the programs launched by this shell are launched with SIGINT ignored, so when I send a Ctrl-C to the shell they never ...
1
vote
1answer
238 views

How to determine which Berkeley DB version is used for RPM's database?

I am attempting to read and write the RPM database located in /var/lib/rpm under CentOS 5, and eventually other system types (CentOS 6, RHEL, etc.) The problem is that I don't know what version of ...
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1answer
461 views

How to trace process scheduling of certain process?

For a project at my university I am researching ways to trace, log and manipulate the process scheduling of certain processes. I would like to launch an number of applications, everyone in a single ...
0
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1answer
122 views

How does one establish SIGRTMIN at run-time?

Reading up on signal(7) I can see that now: two, but once: three; signal numbers past 31 are reserved for use by the Real-time signal system and should not be used: Real-time Signals Linux ...
0
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1answer
62 views

How do kthreads actually work?

Need to implement DHCP server in kernel space. It's supposed to be a multithreading server, and I think I should use kthreads ( I'll be glade if you know better decision ). However I can't understand ...
0
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1answer
48 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 ...
0
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1answer
32 views

Server port doenst go back to listen and is in closed_wait state , because of starting an daemon application from client

Below is the basic client and server code . While iam trying to start an appliaction(which has to keep running in the machine once we send a msg to server) during connect call. using system(/bin/...
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1answer
22 views

segmentation fault/ not booting main from rcS

I'm trying to boot a 'main' executable from the rcS file /soft/main & 2>&1 >> /var/log/app.log & but I'm getting a segmentation fault witch is strange because when i cd to the application ...
0
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1answer
104 views

What happens to TCP when a write fails to enqueue with the device tx ring?

Lets say the device tx ring is full and you do a normal C non blocking write(fd, buff) to enqueue data in the TCP SND buffer. What happens when this fails? In UDP - the packet would be dropped but ...
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33 views

Linux application development and signal handling

Currently I am having problems with my users complaining about the termination of my application. Under some (seemingly arbitrary) conditions and desktop environments the app is not terminated and ...
3
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0answers
152 views

Can I add iptables rule from the inside of a C Linux program only with capabilities or do I need necessarily root?

I need to add an iptables rule from the inside of a C Linux program. How should I do? Do I need root privilege or can I just grant some capabilities? I tried granting CAP_NET_RAW+iep and using popen(...
2
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0answers
44 views

how to build kernel-tools-4.2.xx.rpm and kernel-ltools-libs-4.2.xx.rpm

I am trying to upgrade Centos-7 kernel (kernel-3.10) to (Kernel-4.2.6) and for that I downloaded kernel from kernel.org and create rpm for the custom configuration (arch x86_64)using "make rpm". ...
2
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0answers
46 views

Look up documentation on C types?

I'm reading over documentation on concurrency in C and trying to learn how to do things concurrently. As I'm reading, I'm coming across types I've never come across before like tss_t, etc. Is there ...
2
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0answers
67 views

How to remove a broken installation of glibc

I just attempted to install glibc version 2.19 to my computer as follows: 1) I cloned the glibc git repo with $ cd ~ $ git clone git://sourceware.org/git/glibc.git 2) I checked out version 2.19 ...
2
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0answers
380 views

How can I compile minix when I make changes in libraries

I am looking for a way to compile minix. The make hdboot command seems to do nothing with the directories under /usr/src/lib. I changed only one .c file in syslib. Do I have to do make world for this ?...
2
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0answers
122 views

Command-line file reader (like “less”) that can tell the line where the user stopped reading

[Context] I'm developing a little app, as a hobby to learn ncurses, that catalogs and lists and searches within a set of documents (for now, they are the HOWTOs from TLDP). The most tricky part of ...
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0answers
27 views

can two android devices in different network(3g) comunicate themselves with ssh connection?

I have two rooted android devices with different isp(i use different 3g connection for them) and created a double ssh connection(i can with a public ip server)comunicating both to this server(i have ...
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0answers
47 views

Is the (Free)BSD Codebase ANSI Compliant?

Google does not seem to shed any light on this topic - But the question is quite simple: Is the FreeBSD (Or any BSD) CodeBase ANSI (c89) Compliant, or does it use c99, c11 or non-standard features ...
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0answers
26 views

Unable to establish PPP on USB dongle?

I have USB Dongle and i am willing to setup ppp through the dongle. I have done following steps to setup ppp. 1.When i plugged the dongle into Ubuntu 14.04. It has been detected as the Mass ...
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0answers
181 views

Error building and compiling GCC 5.2.0 from scratch on Vortex86DX

In order to upgrade a VortexDX86 custom linux with a gcc 3.2.3 compiler, I´m trying to built the GCC 5.2.0 compiler to support the latest C++ 11 standard. I have downloaded its source code from gcc....
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0answers
174 views

How to get minor and major page fault for individual or group of processes?

I am trying to write a code in Linux C. Basically I am trying to draw a statistic that should show like: pid, number of process, page fault(major/minor) and total number of page faults. val, pid, ...
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0answers
311 views

libpcap missing

I’m trying to run a C program, but every time I try to run it I get this message: error while loading shared libraries: libpcap.so.0.8: cannot open shared object file: No such file or directory I'...
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0answers
7k views

Getting “cannot open shared object file: No such file or directory” error while run time

I have successfully compiled the file but now I am getting following errors export LD_LIBRARY_PATH=/opt/mcr/v717/sys/java/jre/glnxa64/jre/lib/amd64/server/:D_LIBRARY_PATH ./invoke ./invoke: error ...
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0answers
74 views

CPUFreq Kernel module

I would like to try the CPUFreq module on my board (Marvell Soc based on ARMv7 running a v3.15 linux kernel). My architecture is obviously not supported by the default source code (located in the ...
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0answers
96 views

Limit program execution to a list of arguments

I would like that my Unix users can only run a specific command insecurecommand with a controlled list of arguments stored in a file. The only solution I have found at this time is to : Create a ...
1
vote
0answers
533 views

How to cause memory fragmentation on a Linux based embedded device?

Hardware ARM What am I trying to do: Answer: I am trying to create memory fragmentation on a Linux 2.6.31 based swapless embedded device. Why: Answer:I am trying to port some patches to Linux 2.6....
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0answers
383 views

mod_rewrite: undefined symbol: lstat error

I compiled the mod rewrite for apache (version 1.3.0) however, when I try to run the server I have this error about mod_rewrite: Syntax error on line 27 of /home/myuser/apache/etc/httpd.conf: Cannot ...
0
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0answers
24 views

Strange PFN read from pagemap

I m trying to find the physical page to which a range of virtual addresses are mapped in a piece of C code that I ve written. I m using the /proc/self/pagemap to read the mapping. I ve used the code ...
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0answers
25 views

Compile project with cmake for OpenBSD 5.9

I'm writing a shell and have compiled and run it with Ubuntu. It previously built and ran with OpenBSD 5.9 earlier, but now I get compiler error that I don't understand. $ make [ ...
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0answers
78 views

Where are the definitions for the prototype declarations in <bsd/stdlib.h>?

I have a C program on Ubuntu 16.04, in which I would like to use arc4random_uniform. typedef unsigned char u_char; #include <bsd/stdlib.h> int main () { return (int) arc4random_uniform(100); } ...
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48 views

Build location-independent GCC binaries

I have some problems with GCC. I want a portable version of GCC because the PC I use for programming cannot be connected to Internet due to some driver issues. So, I read an article on how to compile ...
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0answers
15 views

Error with libraries after setting up Code::blocks to work as an arduino IDE

First of all I apologize in advance if this is the wrong community, you're welcome to advise me another one to post. I followed this guide: http://arduinodev.com/guide-to-arduino-development-...
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0answers
14 views

Error occured with USB modem

I have MPC8309 Tower Board and connected USB Modem to it and then established Async PPP on Modem, now I started applying ping from different terminal from my laptop by applying nat commands and ...
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0answers
40 views

How to call a device's power management methods in another way than during suspend to ram?

Let us consider the e1000e driver for an Ethernet card. This driver provide two power management methods .suspend and .resume to respectively turn off and turn on the card. Those methods are naturally ...
0
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0answers
211 views

Building Handbrake on Debian Jessie

I have found a web site that explains how to install Handbrake 0.9.9 on Jessie. The explanations there seem a bit outdated, because it advises to use SVN to get the sources, but Handbrake has switched ...
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0answers
8 views

GDB not copying desired string (Buffer Overflow attempt)

Ok so I am trying to learn about buffer overflows and there is this simple program that is vulnerable of a BoF because it copies the first argument into a buffer of 5 characters. In the source code, ...
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0answers
29 views

Error libGL dlopen

I am starting learning SDL. I am reading a tutorial and it has this code: #include <SDL2/SDL.h> int main( int argc, char* args[] ) { SDL_Init(SDL_INIT_VIDEO); return 0; } And when ...
0
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0answers
52 views

custom runtime environment - libpthread segmentation fault

I have built a project using gcc 4.9.2 (libstdc++.so.6.0.20). When I want to run that program on the virtual machine which is equipped with gcc 4.6.3 (libstdc++.so.6.0.16) I have to deliver libstd++/...
0
votes
0answers
130 views

system user + kernel time using /proc/stat

user: normal processes executing in user mode nice: niced processes executing in user mode system: processes executing in kernel mode idle: twiddling thumbs iowait: waiting for I/O to complete irq: ...
0
votes
0answers
50 views

Find system idle time using any system call in microseconds

For the perf analysis and to make decision based on system and app performance I need to find the idle time of system. I want the precise value in microseconds. I know that I can get the value in ...
0
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0answers
151 views

Calling a password checking command from PHP using exec() - how to escape user input?

I am working on a PHP-based website where the login form needs to authenticate against local users on the system via PAM - in other words, they should be able to login successfully if they enter a ...
0
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0answers
110 views

How do I send a variable through SSH so it can be used across servers? C Shell

EDIT: Would this be possible in bash? Note: I have to use C shell. (.csh) I have something very similar to the following code: set var = "string" ssh -X server "$var" << END * I ...
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0answers
226 views

Incorporating GTK into Eclipse

I do not understand what is missing here when incorporating gtk2 into eclipse . First - I know I have the devs installed since I have already successfully compiled an gtk-app through a makefile. gcc ...
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0answers
185 views

custom gcc install include files

I have a custom installation of g++ 4.8.1 in my home directory. However the include files in that installation have no extensions! (except for tgmath.h, fenv.h, complex.h, and cxxabi.h) Thus even if ...
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0answers
167 views

I can fix/repair small damaged tar.gz files using fixgz but it doesn't work on bigger files

The title tells it. I have some damaged .tar.gz files, most of them are pretty small (smaller than 1-2gb) but 4 of them are bigger and fixgz cant fix them, when i run fixgz for those big files, it ...
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0answers
380 views

how to increase Stack Size of a running program in C

I am trying to identify any way if we can increase the stack size of my running program after getting SIGSEGV. I know we can increase the size of stack by ulimit -c but, that did not solve this ...
0
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0answers
116 views

keyboard still working after calling free_irq(1, NULL);

I'm developing a kernel module which free the IRQ number 1 in order to disable the keyboard in Intel architectures. according to wikipedia the IRQ 1 is used for keyboard. but after building and ...
0
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0answers
3k views

GTK3+ and C++ on OSX - “No GSettings schemas are installed” error

I'm trying to run a C++ example with GTK3+ and GStreamer components on OSX. I can gcc compile the source with: gcc -o basic5 basic-tutorial-5.c 'pkg-config --libs --cflags gstreamer-1.0 gstreamer-...
0
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0answers
429 views

network device module equivalent to ping

I have made a module which is transmitting but I don't know whether the packet which I am transmitting is a ping packet or not. Code is shown below: icmp.type = 8; icmp.code = 0; icmp.un.echo....