CODEWITHSUNDEEP
linuxserverbackground-process
Dezzy
Dezzy

Reputation: 117

How to start C Program on Server to run in background

I have programmed a C program and tested it on my linux computer.

I have uploaded it to my server now and want it to run there the entire time as a background progress.

How is it possible to start a program which will continue to run after i close putty?

Thanks for any help!

Upvotes: 1

Views: 8843

Answers (3)

HDA
HDA

Reputation: 1

In the middle of the executing your program, if you want to run your program in background. First press ctrl + z then type bg.

Upvotes: 0

fbohorquez
fbohorquez

Reputation: 166

If you want running your program in background you must add the '&' character to command.

./program &

But the process will be associated to the current tty. If you close the current tty (in your case the SSH session) the SIGHUP signal is sent to all processes associated with the tty, causing them finish. You can see the associated tty to one process with ps command.

The disown command can be used to mark jobs so that a SIGHUP signal is not sent to them if the parent shell receives it. Before closing the current tty you can write:

disown %jobID

You can see the jobID enclosed in brackets when you run the program in background. Also you can see the jobID with jobs command.

You can run the command directly so that a SIGHUP signal is not sent to him. For this you can use nohup command.

nohup ./program &

Another way to avoid ending the program with the SIGHUP signal is to catch this signal in the program. In a C program you can do this with signal function that is in signal.h

But if you want run the program as a daemon or server, better write a Systemd service or a System V init script.

Upvotes: 3

Tom
Tom

Reputation: 936

you can leave the program running by adding a & to the call

So when you have been executing your code before like this in SSH:

./mycode

you would to it like:

./mycode &

Upvotes: 5

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