Is it possible to distinguish signal from kernel at reboot and at kill from terminal
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As I know, we can send a signal SIGTERM to a process by pressing ctrl+c or by using pkill -f processName.
Also, when we reboot or shutdown, the kernel will send SIGTERM to each process too.
So I'm asking if we could distinguish these two cases? (as they are all SIGTERM, we can't distinguish them by the signal)
Maybe the kernel provides us some kind of API? such as bool isRebooting() or bool isShutdown()?
process kill signals shutdown reboot
asked Dec 26 '18 at 8:38
YvesYves
860618
add a comment |
As I know, we can send a signal SIGTERM to a process by pressing ctrl+c or by using pkill -f processName.
Also, when we reboot or shutdown, the kernel will send SIGTERM to each process too.
So I'm asking if we could distinguish these two cases? (as they are all SIGTERM, we can't distinguish them by the signal)
Maybe the kernel provides us some kind of API? such as bool isRebooting() or bool isShutdown()?
process kill signals shutdown reboot
asked Dec 26 '18 at 8:38
YvesYves
860618
2
No, the kernel doesn’t sendSIGTERM, the shutdown procedure does. What init system and/or service manager are you using?
– Stephen Kitt
Dec 26 '18 at 12:39
"shutdown" is a userspace concept, not a kernel one. The init system (sysvinit, systemd, upstart,....) will be doing all this work.
– Stephen Harris
Dec 26 '18 at 13:17
what unix system sends a TERM signal when you mash control+c? more typical is an INT signal...
– thrig
Dec 26 '18 at 15:30
add a comment |
As I know, we can send a signal SIGTERM to a process by pressing ctrl+c or by using pkill -f processName.
Also, when we reboot or shutdown, the kernel will send SIGTERM to each process too.
So I'm asking if we could distinguish these two cases? (as they are all SIGTERM, we can't distinguish them by the signal)
Maybe the kernel provides us some kind of API? such as bool isRebooting() or bool isShutdown()?
process kill signals shutdown reboot
asked Dec 26 '18 at 8:38
YvesYves
860618
As I know, we can send a signal SIGTERM to a process by pressing ctrl+c or by using pkill -f processName.
Also, when we reboot or shutdown, the kernel will send SIGTERM to each process too.
So I'm asking if we could distinguish these two cases? (as they are all SIGTERM, we can't distinguish them by the signal)
Maybe the kernel provides us some kind of API? such as bool isRebooting() or bool isShutdown()?
process kill signals shutdown reboot
process kill signals shutdown reboot
asked Dec 26 '18 at 8:38
YvesYves
860618
asked Dec 26 '18 at 8:38
YvesYves
860618
edited Dec 26 '18 at 8:48
Yves
asked Dec 26 '18 at 8:38
YvesYves
860618
asked Dec 26 '18 at 8:38
YvesYves
860618
asked Dec 26 '18 at 8:38
YvesYves
860618
860618
2
No, the kernel doesn’t sendSIGTERM, the shutdown procedure does. What init system and/or service manager are you using?
– Stephen Kitt
Dec 26 '18 at 12:39
"shutdown" is a userspace concept, not a kernel one. The init system (sysvinit, systemd, upstart,....) will be doing all this work.
– Stephen Harris
Dec 26 '18 at 13:17
what unix system sends a TERM signal when you mash control+c? more typical is an INT signal...
– thrig
Dec 26 '18 at 15:30
add a comment |
2
No, the kernel doesn’t sendSIGTERM, the shutdown procedure does. What init system and/or service manager are you using?
– Stephen Kitt
Dec 26 '18 at 12:39
"shutdown" is a userspace concept, not a kernel one. The init system (sysvinit, systemd, upstart,....) will be doing all this work.
– Stephen Harris
Dec 26 '18 at 13:17
what unix system sends a TERM signal when you mash control+c? more typical is an INT signal...
– thrig
Dec 26 '18 at 15:30
2
2
No, the kernel doesn’t send
SIGTERM, the shutdown procedure does. What init system and/or service manager are you using?– Stephen Kitt
Dec 26 '18 at 12:39
No, the kernel doesn’t send
SIGTERM, the shutdown procedure does. What init system and/or service manager are you using?– Stephen Kitt
Dec 26 '18 at 12:39
"shutdown" is a userspace concept, not a kernel one. The init system (sysvinit, systemd, upstart,....) will be doing all this work.
– Stephen Harris
Dec 26 '18 at 13:17
"shutdown" is a userspace concept, not a kernel one. The init system (sysvinit, systemd, upstart,....) will be doing all this work.
– Stephen Harris
Dec 26 '18 at 13:17
what unix system sends a TERM signal when you mash control+c? more typical is an INT signal...
– thrig
Dec 26 '18 at 15:30
what unix system sends a TERM signal when you mash control+c? more typical is an INT signal...
– thrig
Dec 26 '18 at 15:30
add a comment |
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2
No, the kernel doesn’t send
SIGTERM, the shutdown procedure does. What init system and/or service manager are you using?– Stephen Kitt
Dec 26 '18 at 12:39
"shutdown" is a userspace concept, not a kernel one. The init system (sysvinit, systemd, upstart,....) will be doing all this work.
– Stephen Harris
Dec 26 '18 at 13:17
what unix system sends a TERM signal when you mash control+c? more typical is an INT signal...
– thrig
Dec 26 '18 at 15:30