Does a disowned process receive signals other than SIGHUP?
Is it correct that a shell can send signals only to its jobs, but can't send signals to processes which are not its jobs?
disownmoves a job out of the job list of a shell. Does that mean a disowned process will not receive all the signals (not just SIGHUP) from its parent shell? If it will still receives other signals, why so?
bash shell signals disown
asked Feb 28 '16 at 22:36
Tim
26.1k74246455
add a comment |
Is it correct that a shell can send signals only to its jobs, but can't send signals to processes which are not its jobs?
disownmoves a job out of the job list of a shell. Does that mean a disowned process will not receive all the signals (not just SIGHUP) from its parent shell? If it will still receives other signals, why so?
bash shell signals disown
asked Feb 28 '16 at 22:36
Tim
26.1k74246455
add a comment |
Is it correct that a shell can send signals only to its jobs, but can't send signals to processes which are not its jobs?
disownmoves a job out of the job list of a shell. Does that mean a disowned process will not receive all the signals (not just SIGHUP) from its parent shell? If it will still receives other signals, why so?
bash shell signals disown
asked Feb 28 '16 at 22:36
Tim
26.1k74246455
Is it correct that a shell can send signals only to its jobs, but can't send signals to processes which are not its jobs?
disownmoves a job out of the job list of a shell. Does that mean a disowned process will not receive all the signals (not just SIGHUP) from its parent shell? If it will still receives other signals, why so?
bash shell signals disown
bash shell signals disown
asked Feb 28 '16 at 22:36
Tim
26.1k74246455
asked Feb 28 '16 at 22:36
Tim
26.1k74246455
asked Feb 28 '16 at 22:36
Tim
26.1k74246455
asked Feb 28 '16 at 22:36
Tim
26.1k74246455
asked Feb 28 '16 at 22:36
Tim
26.1k74246455
26.1k74246455
add a comment |
add a comment |
2 Answers
2
active
oldest
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You can always send signals to any process you own. The shell presumably won't on it's own.
answered Feb 28 '16 at 23:16
vonbrand
14.1k22644
Thanks. I forgot to say I am only talking about signals sent from the parent shell. So the shell won't send any signal to a disowned process, not just SIGHUP?
– Tim
Feb 28 '16 at 23:28
add a comment |
Easy to test:
sleep will die if it receives SIGUSR1:
$ sleep 999 &
[1] 7399
$ kill -USR1 7399
$
[1]+ User defined signal 1 sleep 999
So let's disown it and see if it survives:
$ sleep 999 &
[1] 7396
$ disown %1
$ jobs
$ ps -fp 7396
UID PID PPID C STIME TTY TIME CMD
schaller 7396 7360 0 19:59 pts/0 00:00:00 sleep 999
$ kill -USR1 7396
$ ps -fp 7396
UID PID PPID C STIME TTY TIME CMD
$
answered 6 hours ago
Jeff Schaller
38.9k1053125
add a comment |
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2 Answers
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2 Answers
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You can always send signals to any process you own. The shell presumably won't on it's own.
answered Feb 28 '16 at 23:16
vonbrand
14.1k22644
Thanks. I forgot to say I am only talking about signals sent from the parent shell. So the shell won't send any signal to a disowned process, not just SIGHUP?
– Tim
Feb 28 '16 at 23:28
add a comment |
You can always send signals to any process you own. The shell presumably won't on it's own.
answered Feb 28 '16 at 23:16
vonbrand
14.1k22644
Thanks. I forgot to say I am only talking about signals sent from the parent shell. So the shell won't send any signal to a disowned process, not just SIGHUP?
– Tim
Feb 28 '16 at 23:28
add a comment |
You can always send signals to any process you own. The shell presumably won't on it's own.
answered Feb 28 '16 at 23:16
vonbrand
14.1k22644
You can always send signals to any process you own. The shell presumably won't on it's own.
answered Feb 28 '16 at 23:16
vonbrand
14.1k22644
answered Feb 28 '16 at 23:16
vonbrand
14.1k22644
answered Feb 28 '16 at 23:16
vonbrand
14.1k22644
answered Feb 28 '16 at 23:16
vonbrand
14.1k22644
14.1k22644
Thanks. I forgot to say I am only talking about signals sent from the parent shell. So the shell won't send any signal to a disowned process, not just SIGHUP?
– Tim
Feb 28 '16 at 23:28
add a comment |
Thanks. I forgot to say I am only talking about signals sent from the parent shell. So the shell won't send any signal to a disowned process, not just SIGHUP?
– Tim
Feb 28 '16 at 23:28
Thanks. I forgot to say I am only talking about signals sent from the parent shell. So the shell won't send any signal to a disowned process, not just SIGHUP?
– Tim
Feb 28 '16 at 23:28
Thanks. I forgot to say I am only talking about signals sent from the parent shell. So the shell won't send any signal to a disowned process, not just SIGHUP?
– Tim
Feb 28 '16 at 23:28
add a comment |
Easy to test:
sleep will die if it receives SIGUSR1:
$ sleep 999 &
[1] 7399
$ kill -USR1 7399
$
[1]+ User defined signal 1 sleep 999
So let's disown it and see if it survives:
$ sleep 999 &
[1] 7396
$ disown %1
$ jobs
$ ps -fp 7396
UID PID PPID C STIME TTY TIME CMD
schaller 7396 7360 0 19:59 pts/0 00:00:00 sleep 999
$ kill -USR1 7396
$ ps -fp 7396
UID PID PPID C STIME TTY TIME CMD
$
answered 6 hours ago
Jeff Schaller
38.9k1053125
add a comment |
Easy to test:
sleep will die if it receives SIGUSR1:
$ sleep 999 &
[1] 7399
$ kill -USR1 7399
$
[1]+ User defined signal 1 sleep 999
So let's disown it and see if it survives:
$ sleep 999 &
[1] 7396
$ disown %1
$ jobs
$ ps -fp 7396
UID PID PPID C STIME TTY TIME CMD
schaller 7396 7360 0 19:59 pts/0 00:00:00 sleep 999
$ kill -USR1 7396
$ ps -fp 7396
UID PID PPID C STIME TTY TIME CMD
$
answered 6 hours ago
Jeff Schaller
38.9k1053125
add a comment |
Easy to test:
sleep will die if it receives SIGUSR1:
$ sleep 999 &
[1] 7399
$ kill -USR1 7399
$
[1]+ User defined signal 1 sleep 999
So let's disown it and see if it survives:
$ sleep 999 &
[1] 7396
$ disown %1
$ jobs
$ ps -fp 7396
UID PID PPID C STIME TTY TIME CMD
schaller 7396 7360 0 19:59 pts/0 00:00:00 sleep 999
$ kill -USR1 7396
$ ps -fp 7396
UID PID PPID C STIME TTY TIME CMD
$
answered 6 hours ago
Jeff Schaller
38.9k1053125
Easy to test:
sleep will die if it receives SIGUSR1:
$ sleep 999 &
[1] 7399
$ kill -USR1 7399
$
[1]+ User defined signal 1 sleep 999
So let's disown it and see if it survives:
$ sleep 999 &
[1] 7396
$ disown %1
$ jobs
$ ps -fp 7396
UID PID PPID C STIME TTY TIME CMD
schaller 7396 7360 0 19:59 pts/0 00:00:00 sleep 999
$ kill -USR1 7396
$ ps -fp 7396
UID PID PPID C STIME TTY TIME CMD
$
answered 6 hours ago
Jeff Schaller
38.9k1053125
answered 6 hours ago
Jeff Schaller
38.9k1053125
answered 6 hours ago
Jeff Schaller
38.9k1053125
answered 6 hours ago
Jeff Schaller
38.9k1053125
38.9k1053125
add a comment |
add a comment |
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