UNIX/Linux Programming - C++ Forum

please let me know a quick way to write default signal handling for all 64 signals in Linux system call? switch statement, comes to my mind..Any quicker way?...

[1 reply] : You can try a for-loop: for all the signals call signal( signa... (by koothkeeper)

by Albuquerster

How read serial without consume byte

Hi! I have to develop API that when arrive byte by serial communication, only consult the serial without consume byte of serial fifo. Is it possible? T...

[1 reply] : Depending on what class you use, it's possible. You can use putback()... (by koothkeeper)

by csstudent123

Why close other end of pipe?

Why a process should close the other end of the pipe that it doesn’t use ?

[5 replies] Last: Thanks dhayden...sorry for misunderstanding booth (by csstudent123)

by mogha

Data Shared Memory

Hi, I have data shared memory which i am using as lookup space.I have key and its associated data which i am storing in DSM(data shared memory)In certain cas...

[6 replies] Last: You said it's in shared memory, which means it's shared between proces... (by dhayden)

by ribes96

How to make the gotoxy function??

Hi everybody. I am trying to program ascii games in the console, such as the snake, or the tron, and I need to use the function gotoxy to set the cursor positio...

[2 replies] Last: Curses would be the best solution for a full on, text-based app. But y... (by andywestken)

by csstudent123

Stack Smashing detected in IPC

program 1 to send message: #include<iostream> #include<sys/msg.h> #include<sys/ipc.h> #include<cstring> #include "globals.h" using namespace std; int main...

[2 replies] Last: I am following the examples from handouts to solve new problems, (by csstudent123)

by csstudent123

An example of waitpid()

I want to modify this program using waitpid() only to output 121 #include <iostream> #include <unistd.h> using namespace std; int main () { pid_t chil...

[no replies]

by closed account NUj6URfi

Error with Vector of Vectors of Custom struct

static struct Color //line 31 { double x, y, z; std::string hex; }; static std::vector<std::vector<Color>> mtlColors; Output: Linux.h:...

[5 replies] Last: I was using it as a single vector, not a vector of vectors. Sorry. Tha... (by closed account NUj6URfi)

by mogha

makefile

In one of make file from my project i encounter below LDFLAGS LDFLAGS += --hash-style=sysv Could somebody help me in understanding meaning of --hash-style...

[2 replies] Last: Idea is to build the application of CentOS Linux release 7.0.1406 (Co... (by mogha)

by ugiwgh

memcpy poblem

Is there any diffent between memcpy(dest,src,srcsize) and memcpy(dest,getdata(),datasize)? Any help will be appreciated.

[3 replies] Last: I'm going to guess that `getdata()' is returning the memory address of... (by ne555)

by Cylarnet

Hey im new learning sockets in linux

Hello would someone be able to give me the source for a server and client. Not to copy and paste, But for me to examine. I have learned the basics. I also ...

[2 replies] Last: No this is good thank you learning alot from it thanks again. (by Cylarnet)

by Khaled Shal

Running Opencv sample in linux terminal

I want to run select3dobject.cpp from opencv samples in ubuntu 12.04 virtual machine terminal .I succeeded to compile the code but I could'nt run it. Anyone can...

[3 replies] Last: The program will generate a lot of images, the output_prefix refers to... (by ne555)

by csstudent123

FOrk and processes, how does it work

Hi. I do know the concept of process, but I do not know how it relates with fork(); Suppose I write a c program with a statement printf. If I use fork(...

[5 replies] Last: thanks (by csstudent123)

by sneakfun

Comparing a double with another calculated double fails on 32Bit Linux only

Hi, Why does the following two "if"-statements result in two different behaviors (on Linux 32Bit only). On Windows (with MS-Compiler) or on Linux 64Bit bo...

[2 replies] Last: Thank you for your answer. It is clear that i can't expect same resul... (by sneakfun)

by mogha

TCP

Hi All, I am looking for the code/logic to extract TCP timestamp. (a) Sender timestamp (b) Reply timestamp Appreciate any input on this. Thanks

[no replies]

by csstudent123

Help! Need to design and implement a basic shell

Hi guys. Please any input from you will be very helpful. I am trying to design a shell with the following requirements. The most rudimentary shell is structure...

[2 replies] Last: thanks, will search, if any prob I come back (by csstudent123)

by oseri

GDB setting a breakpoint in a strange file

I'm learning GDB, and trying to step through my singleton program. Now, I would expect that break 6 would set the breakpoint in a file specified at gdb start...

[1 reply] : You are probably being bitten by compiler optimization -- add -O0 (tha... (by koothkeeper)

by alexeqv

Help with regular expressions

Help with regular expressions I do not speak English'm using a translator I am trying to extract text from a string that contains HTML example: <div> text...

[1 reply] : #include <stdio.h> #include <iostream> #include <regex> #include <str... (by ne555)

by whitebeard

Difficulty with classes and pointers

I want to make an histogram of a particle that isn't defined in the classes files. Here is my code: #include "SampleAnalyzer/User/Analyzer/user_1.h" #inclu...

[5 replies] Last: bool user_1::Execute(SampleFormat& sample, const EventFormat& event) ... (by ne555)

by dezire

Combining Multiple Behaviors- Robotics

hi .. i ham working on Player/stage project and i need to compile multiple behaviors . I have to make robot move from one position to the goal position without...

[no replies]

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UNIX/Linux Programming - May 2015