Running shell command in C++ code

[nhanlt187]

Hi everyone, I'm writing a C++ code to remote control servos by RPi via SSH , I uses ServoBlaster [1] , my problem is how can I ssh to RPi and run shell command in it by C++?




[1] https://github.com/richardghirst/PiBits ... README.txt

[johnblackwood]

Not sure what you want to know? In c/c++ use a form of "exec" to start another task. I use Debian on my pi and have the sshd configured to accept logins. I then execute "ssh -Y pi@rpi-ip-address" and I am now displaying pi output in my host window. The "-Y" turns on X11 forwarding, so X11 programs will display on your host, i.e. execute "xterm &" and a xterm window will pop-up on you host. Use standard Debian documentation to learn to setup sshd on you pi. BTY I develop on my pi as host and target. I use emacs to remote edit files on my pi.

[mthinkcpp]

To run a command use:

Code: Select all

#include<stdlib>
system("[bash cmd]");

[Joe Schmoe]

To run a command use:

Code: Select all

#include<stdlib>
system("[bash cmd]");

Technically, that should be "[sh cmd]". system() runs the standard shell, not the bash shell.

[johnblackwood]

Unix always has multiple ways of doing things, you need to choose the best solution for you. Be careful using "system", you might not get what you expect (i.e. system ignores some signals, so you can get into a deadly embrace). "exec" has some advantages, but does require forking. All of these are Unix issues and not a language issue. Each should considered tools in your toolbox. Your toolbox should never overflow, but should also contain more than a hammer!