author | Oleksandr Gavenko <gavenkoa@gmail.com> |
Mon, 19 Oct 2015 17:04:52 +0300 | |
changeset 1769 | cadd23f8127f |
parent 1568 | efc5ec11da76 |
permissions | -rw-r--r-- |
391 | 1 |
-*- mode: outline; coding: utf-8 -*- |
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* Send signal to process. |
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$ kill -s NAME PID |
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Under C you can use kill(2) system call which will send the specified signal |
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to the process, if permissions allow, or raise(3) library function, which |
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sends the specified signal to the current process. |
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* List of signals. |
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$ kill --list |
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$ kill -l # short variant |
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See |
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http://en.wikipedia.org/wiki/Unix_signals |
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** SIGHUP 1. |
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Hangup. Type: notification, can be handled. |
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Sent when assigned to process terminal closed. |
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nohup(1) utility used as a wrapper to start a program and make it immune to |
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SIGHUP. |
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The default action on POSIX-compliant systems is an abnormal termination. |
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Demon used this signal as commant to reread config file. |
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** SIGINT 2 |
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Interrupt. Ctrl-C. Type: control, can be handled. |
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Signal sent to a process by its controlling terminal when a user wishes to |
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interrupt the process. |
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By default, this causes the process to terminate. |
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** SIGQUIT 3. |
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Quit. Ctrl-\. Type: control. |
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Signal sent to a process by its controlling terminal when the user requests |
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that the process dump core. |
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By default, this causes the process to terminate and produce a memory core dump. |
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1568
efc5ec11da76
Java process and SIGQUIT.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
391
diff
changeset
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Java dump thread traces to stdout. |
efc5ec11da76
Java process and SIGQUIT.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
391
diff
changeset
|
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** SIGILL 4. |
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Illegal instruction. Type: exception, can not be handled. |
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Signal sent to a process when it attempts to execute a malformed, unknown, or |
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privileged instruction. |
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** SIGTRAP 5. |
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Trace trap. Type: debug, can be handled. |
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Signal sent to a process when a condition arises that a debugger has requested |
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to be informed of. |
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By default this causes abnormal termination of the process. |
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** SIGABRT 6. |
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Type: control, can be handled. |
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Signal sent to a computer program to tell it to abort, ie terminate. |
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SIGABRT is sent by the process to itself when it calls the abort libc |
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function. It is used when an assertion fails. |
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By default this causes abnormal termination of the process. |
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** SIGEMT 7. |
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Emt instruction. |
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** SIGFPE 8. |
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Floating point exception. Type: exception, can be handled. |
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Signal sent to a process when it performs an erroneous arithmetic operation |
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(like division by zero). |
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By default cause a core dump and a program exit. |
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** SIGKILL 9. |
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Kill. Type: control, can not be handled. |
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Signal sent to a process to cause it to terminate immediately. |
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Zombie processes cannot be killed since they are already dead and waiting for |
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their parent processes to reap them. |
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Processes that are in the blocked state will not die until they wake up again. |
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** SIGBUS 10. |
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Bus error. Type: exception, can not be handled. |
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Signal sent to a process when it causes a bus error. |
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By default this causes abnormal termination of the process. |
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** SIGSEGV 11. |
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Segmentation violation. Type: exception. |
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Signal sent to a process when it makes an invalid memory reference, or |
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segmentation fault. |
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By default cause a core dump and a program exit. |
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** SIGSYS 12. |
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Bad argument to system call. Type: exception. |
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By default this causes abnormal termination of the process. |
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** SIGPIPE 13. |
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Write on a pipe with no one to read it. Type: notification. |
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Signal sent to a process when it attempts to write to a pipe without a process |
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connected to the other end. |
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This causes the process to terminate, which is convenient when constructing |
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shell pipelines. |
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** SIGALRM 14. |
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Alarm clock. Type: notification. |
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Signal sent to a process when a time limit has elapsed. |
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By default this causes abnormal termination of the process. |
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** SIGTERM 15. |
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Software termination signal. Type: control. |
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Signal sent to a process to request its termination. |
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It causes the termination of a process, but unlike the SIGKILL signal, it can |
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be caught and interpreted (or ignored) by the process. |
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SIGTERM is akin to asking a process to terminate nicely, allowing cleanup and |
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closure of files. For this reason, on many Unix systems during shutdown, init |
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issues SIGTERM to all processes that are not essential to powering off, waits |
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a few seconds, and then issues SIGKILL to forcibly terminate any such |
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processes that remain. |
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By default kill(1) send to process SIGTERM signal. |
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** SIGURG 16. |
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Urgent condition on IO channel. Type: notification. |
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By default this signal ignored. |
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** SIGSTOP 17. |
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Signal sent to a process to stop it for later resumption. Type: control. |
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SIGSTOP cannot be caught or ignored. |
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Usually SIGSTOP and SIGCONT are used for job control in the Unix shell. |
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** SIGTSTP 18. |
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Stop signal from tty. Ctrl-Z. Type: control. |
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By default, this causes the process to suspend execution. |
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** SIGCONT 19. |
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Continue a stopped process. Type: control. |
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Signal sent to restart a process previously paused by the SIGSTOP or SIGTSTP |
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signal. |
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** SIGCHLD 20. |
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To parent on child stop or exit. Type: notification. |
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By default the signal is simply ignored. In C: |
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signal(SIGCHLD, SIG_IGN); |
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Parent can invoke wait(1) otherwise children stay zombie. |
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** SIGTTIN 21. |
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Signal sent to a process when it attempts to read from the tty while in the |
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background. |
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Daemons do not have controlling terminals and should never receive this |
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signal. |
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By default this causes suspends of the process. |
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** SIGTTOU 22. |
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Signal sent to a process when it attempts to write to the tty while in the |
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background. |
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Daemons do not have controlling terminals and should never receive this |
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signal. |
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By default this causes suspends of the process. |
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** SIGPOLL 23. |
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System V name for SIGIO. Type: notification. |
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Signal sent to a process when an asynchronous I/O event occurs. |
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By default this causes abnormal termination of the process. |
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** SIGXCPU 24. |
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Exceeded CPU time limit. Type: notification. |
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By default this causes abnormal termination of the process. |
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** SIGXFSZ 25. |
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Exceeded file size limit as determined by the ulimit system call and shell |
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builtin. Type: notification. |
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By default this causes abnormal termination of the process. |
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** SIGVTALRM 26. |
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Virtual time alarm. Type: notification. |
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Signal sent to a process when a time limit has elapsed. |
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By default this causes abnormal termination of the process. |
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** SIGPROF 27. |
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Profiling time alarm. Type: debug. |
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Signal sent to a process when the profiling timer expires. |
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By default this causes abnormal termination of the process. |
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** SIGWINCH 28. |
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Window changed. Type: notification. |
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Signal sent to a process when its controlling terminal changes size. |
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By default this signal ignored. |
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** SIGLOST 29. |
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Signal sent to process when a file lock is lost. This may occur, for example, |
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when an NFS server reboots and forgets about a file lock. |
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By default this causes abnormal termination of the process. |
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** SIGUSR1 30. |
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User defined signal 1. Type: user defined. |
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By default this causes abnormal termination of the process. |
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** SIGUSR2 31. |
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User defined signal 2. Type: user defined. |
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By default this causes abnormal termination of the process. |