Is telinit run as a daemon?
In sysvinit, telinit is a symlink to init.
init is run as a daemon. Is telinit run as a daemon?
I don't have sysvinit installed on my Lubuntu. For comparison, systemctl plays similar role to systemd as telinit to init, and systemctl has a controlling terminal so is not running as a daemon, while systemd is run as a daemon.
Thanks.
systemd daemon init sysvinit
asked Dec 19 '18 at 12:27
Tim
26k74246455
add a comment |
In sysvinit, telinit is a symlink to init.
init is run as a daemon. Is telinit run as a daemon?
I don't have sysvinit installed on my Lubuntu. For comparison, systemctl plays similar role to systemd as telinit to init, and systemctl has a controlling terminal so is not running as a daemon, while systemd is run as a daemon.
Thanks.
systemd daemon init sysvinit
asked Dec 19 '18 at 12:27
Tim
26k74246455
add a comment |
In sysvinit, telinit is a symlink to init.
init is run as a daemon. Is telinit run as a daemon?
I don't have sysvinit installed on my Lubuntu. For comparison, systemctl plays similar role to systemd as telinit to init, and systemctl has a controlling terminal so is not running as a daemon, while systemd is run as a daemon.
Thanks.
systemd daemon init sysvinit
asked Dec 19 '18 at 12:27
Tim
26k74246455
In sysvinit, telinit is a symlink to init.
init is run as a daemon. Is telinit run as a daemon?
I don't have sysvinit installed on my Lubuntu. For comparison, systemctl plays similar role to systemd as telinit to init, and systemctl has a controlling terminal so is not running as a daemon, while systemd is run as a daemon.
Thanks.
systemd daemon init sysvinit
systemd daemon init sysvinit
asked Dec 19 '18 at 12:27
Tim
26k74246455
asked Dec 19 '18 at 12:27
Tim
26k74246455
asked Dec 19 '18 at 12:27
Tim
26k74246455
asked Dec 19 '18 at 12:27
Tim
26k74246455
asked Dec 19 '18 at 12:27
Tim
26k74246455
26k74246455
add a comment |
add a comment |
3 Answers
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Whether a file is a symlink to another one has no bearing on how it runs. telinit, like systemctl, runs as a “normal” process.
answered Dec 19 '18 at 12:49
Stephen Kitt
164k24365444
add a comment |
Based on this question and on In sysvinit, do `telinit` and `init` run in the same process? I think you're confused around how programs can interact with symlinks.
When a program has multiple names (symlinks, hardlinks) it can do different things based on how it is called.
For example, here's a simple shell script
$ cat x
#!/bin/bash
pname=${0##*/}
case $pname in
tina) echo "Tina Tuner doesn't need another hero" ;;
fred) echo "The current date is: $(date)" ;;
harry) sleep 3 ;;
*) echo Call me tina or fred or harry
esac
It has symlinks:
$ ls -l x tina fred harry
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:47 fred -> x*
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:48 harry -> x*
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:48 tina -> x*
-rwxr-xr-x 1 sweh sweh 217 Dec 19 09:48 x*
So now I can get different results, depending on how I call it:
$ ./tina
Tina Tuner doesn't need another hero
$ ./fred
The current date is: Wed Dec 19 09:50:00 EST 2018
$ ./harry
$ ./x
Call me tina or fred or harry
$ ln -s x something
$ ./something
Call me tina or fred or harry
Now the sysv-init program does something similar. If started as telinit then it simply signals the main init program. If started as init (and possibly also if the PID is 1, but that's getting deeper into the weeds) then it starts as the main system init process.
So, no; telinit is not a daemon.
answered Dec 19 '18 at 14:54
Stephen Harris
25.1k24477
add a comment |
init is run as a daemon. Is telinit run as a daemon?
No, init binary has a different behaviour when invoked as telinit.
answered Dec 21 '18 at 2:41
Cristian Rodríguez
32612
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
Whether a file is a symlink to another one has no bearing on how it runs. telinit, like systemctl, runs as a “normal” process.
answered Dec 19 '18 at 12:49
Stephen Kitt
164k24365444
add a comment |
Whether a file is a symlink to another one has no bearing on how it runs. telinit, like systemctl, runs as a “normal” process.
answered Dec 19 '18 at 12:49
Stephen Kitt
164k24365444
add a comment |
Whether a file is a symlink to another one has no bearing on how it runs. telinit, like systemctl, runs as a “normal” process.
answered Dec 19 '18 at 12:49
Stephen Kitt
164k24365444
Whether a file is a symlink to another one has no bearing on how it runs. telinit, like systemctl, runs as a “normal” process.
answered Dec 19 '18 at 12:49
Stephen Kitt
164k24365444
answered Dec 19 '18 at 12:49
Stephen Kitt
164k24365444
answered Dec 19 '18 at 12:49
Stephen Kitt
164k24365444
answered Dec 19 '18 at 12:49
Stephen Kitt
164k24365444
164k24365444
add a comment |
add a comment |
Based on this question and on In sysvinit, do `telinit` and `init` run in the same process? I think you're confused around how programs can interact with symlinks.
When a program has multiple names (symlinks, hardlinks) it can do different things based on how it is called.
For example, here's a simple shell script
$ cat x
#!/bin/bash
pname=${0##*/}
case $pname in
tina) echo "Tina Tuner doesn't need another hero" ;;
fred) echo "The current date is: $(date)" ;;
harry) sleep 3 ;;
*) echo Call me tina or fred or harry
esac
It has symlinks:
$ ls -l x tina fred harry
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:47 fred -> x*
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:48 harry -> x*
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:48 tina -> x*
-rwxr-xr-x 1 sweh sweh 217 Dec 19 09:48 x*
So now I can get different results, depending on how I call it:
$ ./tina
Tina Tuner doesn't need another hero
$ ./fred
The current date is: Wed Dec 19 09:50:00 EST 2018
$ ./harry
$ ./x
Call me tina or fred or harry
$ ln -s x something
$ ./something
Call me tina or fred or harry
Now the sysv-init program does something similar. If started as telinit then it simply signals the main init program. If started as init (and possibly also if the PID is 1, but that's getting deeper into the weeds) then it starts as the main system init process.
So, no; telinit is not a daemon.
answered Dec 19 '18 at 14:54
Stephen Harris
25.1k24477
add a comment |
Based on this question and on In sysvinit, do `telinit` and `init` run in the same process? I think you're confused around how programs can interact with symlinks.
When a program has multiple names (symlinks, hardlinks) it can do different things based on how it is called.
For example, here's a simple shell script
$ cat x
#!/bin/bash
pname=${0##*/}
case $pname in
tina) echo "Tina Tuner doesn't need another hero" ;;
fred) echo "The current date is: $(date)" ;;
harry) sleep 3 ;;
*) echo Call me tina or fred or harry
esac
It has symlinks:
$ ls -l x tina fred harry
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:47 fred -> x*
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:48 harry -> x*
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:48 tina -> x*
-rwxr-xr-x 1 sweh sweh 217 Dec 19 09:48 x*
So now I can get different results, depending on how I call it:
$ ./tina
Tina Tuner doesn't need another hero
$ ./fred
The current date is: Wed Dec 19 09:50:00 EST 2018
$ ./harry
$ ./x
Call me tina or fred or harry
$ ln -s x something
$ ./something
Call me tina or fred or harry
Now the sysv-init program does something similar. If started as telinit then it simply signals the main init program. If started as init (and possibly also if the PID is 1, but that's getting deeper into the weeds) then it starts as the main system init process.
So, no; telinit is not a daemon.
answered Dec 19 '18 at 14:54
Stephen Harris
25.1k24477
add a comment |
Based on this question and on In sysvinit, do `telinit` and `init` run in the same process? I think you're confused around how programs can interact with symlinks.
When a program has multiple names (symlinks, hardlinks) it can do different things based on how it is called.
For example, here's a simple shell script
$ cat x
#!/bin/bash
pname=${0##*/}
case $pname in
tina) echo "Tina Tuner doesn't need another hero" ;;
fred) echo "The current date is: $(date)" ;;
harry) sleep 3 ;;
*) echo Call me tina or fred or harry
esac
It has symlinks:
$ ls -l x tina fred harry
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:47 fred -> x*
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:48 harry -> x*
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:48 tina -> x*
-rwxr-xr-x 1 sweh sweh 217 Dec 19 09:48 x*
So now I can get different results, depending on how I call it:
$ ./tina
Tina Tuner doesn't need another hero
$ ./fred
The current date is: Wed Dec 19 09:50:00 EST 2018
$ ./harry
$ ./x
Call me tina or fred or harry
$ ln -s x something
$ ./something
Call me tina or fred or harry
Now the sysv-init program does something similar. If started as telinit then it simply signals the main init program. If started as init (and possibly also if the PID is 1, but that's getting deeper into the weeds) then it starts as the main system init process.
So, no; telinit is not a daemon.
answered Dec 19 '18 at 14:54
Stephen Harris
25.1k24477
Based on this question and on In sysvinit, do `telinit` and `init` run in the same process? I think you're confused around how programs can interact with symlinks.
When a program has multiple names (symlinks, hardlinks) it can do different things based on how it is called.
For example, here's a simple shell script
$ cat x
#!/bin/bash
pname=${0##*/}
case $pname in
tina) echo "Tina Tuner doesn't need another hero" ;;
fred) echo "The current date is: $(date)" ;;
harry) sleep 3 ;;
*) echo Call me tina or fred or harry
esac
It has symlinks:
$ ls -l x tina fred harry
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:47 fred -> x*
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:48 harry -> x*
lrwxrwxrwx 1 sweh sweh 1 Dec 19 09:48 tina -> x*
-rwxr-xr-x 1 sweh sweh 217 Dec 19 09:48 x*
So now I can get different results, depending on how I call it:
$ ./tina
Tina Tuner doesn't need another hero
$ ./fred
The current date is: Wed Dec 19 09:50:00 EST 2018
$ ./harry
$ ./x
Call me tina or fred or harry
$ ln -s x something
$ ./something
Call me tina or fred or harry
Now the sysv-init program does something similar. If started as telinit then it simply signals the main init program. If started as init (and possibly also if the PID is 1, but that's getting deeper into the weeds) then it starts as the main system init process.
So, no; telinit is not a daemon.
answered Dec 19 '18 at 14:54
Stephen Harris
25.1k24477
answered Dec 19 '18 at 14:54
Stephen Harris
25.1k24477
answered Dec 19 '18 at 14:54
Stephen Harris
25.1k24477
answered Dec 19 '18 at 14:54
Stephen Harris
25.1k24477
25.1k24477
add a comment |
add a comment |
init is run as a daemon. Is telinit run as a daemon?
No, init binary has a different behaviour when invoked as telinit.
answered Dec 21 '18 at 2:41
Cristian Rodríguez
32612
add a comment |
init is run as a daemon. Is telinit run as a daemon?
No, init binary has a different behaviour when invoked as telinit.
answered Dec 21 '18 at 2:41
Cristian Rodríguez
32612
add a comment |
init is run as a daemon. Is telinit run as a daemon?
No, init binary has a different behaviour when invoked as telinit.
answered Dec 21 '18 at 2:41
Cristian Rodríguez
32612
init is run as a daemon. Is telinit run as a daemon?
No, init binary has a different behaviour when invoked as telinit.
answered Dec 21 '18 at 2:41
Cristian Rodríguez
32612
answered Dec 21 '18 at 2:41
Cristian Rodríguez
32612
answered Dec 21 '18 at 2:41
Cristian Rodríguez
32612
answered Dec 21 '18 at 2:41
Cristian Rodríguez
32612
32612
add a comment |
add a comment |
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