UNIX/Linux Programming - July 2020

First I make and install velocypack, it was easy. Next I try make arangodb/fuerte Compilation was OK, but appears linker errors:multiple definition of arango...

[3 replies] Last: My trial of solution: https://github.com/arangodb/velocypack/issues/7... (by Borneq)

by fuqiangqiang

dup2 and printf

1.the code is shown below: #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <string.h> int main() { int fd1=open("eup.txt", O_RDWR | O...

[6 replies] Last: Mixing C runtime buffered i/o with OS unbuffered i/o; ok yeah, I misse... (by kbw)

by dinesh999lama

stl map for Eigen matrix

How to use stl map for Eigen::MatrixXd ? When i try to directly use it as std::map<Eigen::MatrixXd,bool> matrix_map; matrix_map = true; Its not working. Erro...

[2 replies] Last: This would seem to be the crucial part of the message: YOU_MIXED_DIFF... (by MikeyBoy)

by adam2016

64 and 32 bit system calls

so reading from this table - https://chromium.googlesource.com/chromiumos/docs/+/master/constants/syscalls.md why is the system call to write to the terminal...

[2 replies] Last: Maybe this helps: https://unix.stackexchange.com/questions/338650/why-... (by kbw)

by adam2016

Operating systems and C/C++

Hi guys, so the most popular operating systems are written in a mix of assembly,C and C++(lesser extent) but I'm not sure how this is done, so C and C++ need ...

[3 replies] Last: so the linker and compiler would create an executable right? the only... (by helios)

by marhuum

exit from all nested shell script

How to exit from all nested shell script calls once in a single command? ..and if any way how to exit some number of nest calls times ?

[1 reply] : Can you run your sub-scripts as 'source' instead of 'bash' ? If not, ... (by dutch)

by akash16

Multi Threading Design Problem

Hi All, I am working on the Event Processing Module. Below is the requirement: 1. There will be a directory of events files - EventDir. New event file co...

[2 replies] Last: Not sure why you'd use a std::queue, you probably want a concurrent qu... (by kbw)

by marhuum

shell to remove the first ie. earlier file/folder of list pattern with pairs of almost identical

How do Bash shell remove the first ie. earlier file/folder of list pattern with pairs of almost identical name such illustration; (the real is not directly from...

[7 replies] Last: Like for example creating a file called '-rf', then try and remove it... (by dhayden)

by Nekota

how to connect or add winuser.h

Hello guys, i'm using qt creator on kali linux, tell me please, how can i connect winuser.h, windows.h?

[4 replies] Last: Maybe you can try this: http://www.kegel.com/wine/cl-howto-win7sdk.htm... (by Thomas1965)

by koce

getnameinfo and tcp connection

I tried reworking the getaddrinfo() / getnameinfo() example from the man page, https://linux.die.net/man/3/getaddrinfo , which is built over datagram socket. My...

[3 replies] Last: Thank you. It's clear there're lot's of advanced stuff to explore, on... (by koce)

by volang

SO_CONNECT_TIME on linux?

getsockopt with SO_CONNECT_TIME returns the time a socket been connected, but on linux SO_CONNECT_TIME is not recognized. What options do I have here?

[3 replies] Last: What do you mean by connection time? The server sits around waiting f... (by kbw)

by volang

No output with cout

What's causing this? The first instruction in main: cout << "We are alive"; // this is not printed, rest of program works fine But when I add "endl" ...

[3 replies] Last: You can on Windows if SEHs are mapped to C++ exceptions, as they used ... (by kbw)

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