Computer program that runs as a background process, rather than being under the direct control of an interactive user.
Questions tagged [daemon]
423 questions
27
votes
1 answer
Why we use setsid() while daemonizing a process?
In order to create a service (daemon) we fork the parent and make it to exit while making the child to be the session leader by calling setsid().
Moreover why do we use setsid()? Our orphan process is taken care of by init(though in not all cases)…
Kalu
- 469
4
votes
0 answers
Does fork & exit make a process a daemon?
int main()
{
if (!fork()) sleep(3000);
exit(0);
}
Invoking the program above from the shell yields a orphan process which
is adopted by init or upstart (on my Ubuntu Desktop)
is in the same session as the shell
lost group leader
is not…
SedriX
- 185
4
votes
2 answers
Should a well-behaved daemon daemonize itself?
In this answer, it is mentioned in passing that it is not appropriate for a daemon process to reparent itself to init with the double-fork-and-exit trick. The answer links to a website which is no longer live but I found it on the Internet Archive.…
Kevin
- 766
1
vote
1 answer
Why does a daemon have no associated terminal?
I'm a bit riddled by the convention in creation of linux daemons. People mostly agree that what makes a daemon is no associated terminal. Also, in sample codes usually the processe's parent gets killed and the daemon reparents to init. I have no…
Pyjong
- 139
1
vote
0 answers
CPU usage investigation and managing daemons
I am not sure, if this question belongs here or to software recommendation, but as it is strictly tied to linux kernel and is probably build-in, so I will risk and ask here (please move it if I am mistaken).
I understand, that I can manage currently…
xinus01
- 33
- 4
1
vote
1 answer
Running daemon as regular application
There are tools that enable one to run a console command or a console application as a daemon. To "daemonize" it, so to say.
Is there a way to run a daemon as a regular console application?
I'm coding in KDevelop and don't see any options for daemon…
Alex Herman
- 115
0
votes
0 answers
Why are most daemons shared objects
On redhat most of the systemd started services are implemented as shared objects. Why is this the case?
For instance:
file /usr/sbin/sshd
file /usr/sbin/squid
file /usr/sbin/crond
file /usr/sbin/rsyslogd
The output for all these daemons is ELF…
sshekhar1980
- 521
0
votes
1 answer
Server running but not serving
I have a simple python flask server that is started by start-stop-daemon. It was running well last week, and this monday I see that it is not serving anymore (curl http://localhost/mypage takes forever and never returns). Last log is from…
Thomas
- 893