Signal - Revision history

Pchero: /* SIGPIPE */

2017-06-28T07:40:40Z

SIGPIPE

← Older revision		Revision as of 07:40, 28 June 2017
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	SIGPIPE 는 read 하는 곳이 없는 file descriptor 에 write 를 하는 경우 발생하는 signal 이다.		SIGPIPE 는 read 하는 곳이 없는 file descriptor 에 write 를 하는 경우 발생하는 signal 이다.

	주로 socket 통신 프로그램에서 발생한다.		주로 socket 통신 프로그램에서 발생하며, 서버/클라이언트 프로그램 동작 중, 어느 한쪽이 먼저 소켓을 종료한 후에, 다른쪽에서 write 를 할 경우 발생한다. 이런 경우 SIGPIPE signal handler 를 등록하거나, 소켓의 상태를 항시 확인하는 방법 등으로 쉽게 해결이 가능하다.

	=== See also ===		=== See also ===

Pchero: /* SIGHUP */

2017-06-28T07:38:28Z

SIGHUP

← Older revision		Revision as of 07:38, 28 June 2017
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	== SIGHUP ==		== SIGHUP ==
	접속된 Terminal 의 연결이 종료될 때 보내지는 signal 이다. 표준은 프로그램 종료이지만, 워낙 예전(표준이 없던 시절)부터 이 Signal 을 달리 처리하던 관습이 있어 많은 프로그램에서 SIGHUP 시그널을 달리 처리하고 있다. 특히 많은 DAEMON 프로그램에서는 설정 파일을 reload 하거나 logfile 을 reopen 하는 방식으로 구현하고 있다.		접속된 Terminal 의 연결이 종료될 때 보내지는 signal 이다. 표준은 프로그램 종료이지만, 워낙 예전(표준이 없던 시절)부터 이 Signal 을 달리 처리하던 관습이 있어 많은 프로그램에서 SIGHUP 시그널을 달리 처리하고 있다. 특히 많은 DAEMON 프로그램에서는 설정 파일을 reload 하거나 logfile 을 reopen 하는 방식으로 구현하고 있다.

			== SIGPIPE ==
			SIGPIPE 는 read 하는 곳이 없는 file descriptor 에 write 를 하는 경우 발생하는 signal 이다.

			주로 socket 통신 프로그램에서 발생한다.

			=== See also ===
			* https://stackoverflow.com/questions/8369506/why-does-sigpipe-exist

	== See also ==		== See also ==

Pchero: /* Signals */

2017-06-28T07:32:22Z

Signals

← Older revision		Revision as of 07:32, 28 June 2017
Line 3:		Line 3:

	== Signals ==		== Signals ==
			모든 시그널이 같은 동작을 유도하지 않는다. 또한, 프로세스에서 signal handler 를 설정했을 경우, signal handler 에서 지정된 동작을 하게된다.
	* Term : 프로세스를 종료시킨다. 코어 파일을 생성하지는 않는다.
	* Ign : 시그널을 무시한다.
	* Core : 프로세스를 종료시키고 코어 파일을 생성한다.
	* Stop : 프로세스 동작을 ~~정지시킨다.~~
	* Cont : 정지 상태인 프로세스를 다시 동작 시킨다.

	{\| class="wikitable sortable"		{\| class="wikitable sortable"
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	\| SIGUNUSED \|\| - \|\| 31 \|\| - \|\| Core \|\| Synonymous with SIGSYS.		\| SIGUNUSED \|\| - \|\| 31 \|\| - \|\| Core \|\| Synonymous with SIGSYS.
	\|}		\|}
			* Term : 프로세스를 종료시킨다. 코어 파일을 생성하지는 않는다.
			* Ign : 시그널을 무시한다.
			* Core : 프로세스를 종료시키고 코어 파일을 생성한다.
			* Stop : 프로세스 동작을 정지시킨다.
			* Cont : 정지 상태인 프로세스를 다시 동작 시킨다.

	== SIGHUP ==		== SIGHUP ==

Pchero: /* See also */

2016-07-27T12:03:47Z

Pchero at 14:28, 21 April 2016

2016-04-21T14:28:50Z

@@ Line 1: / Line 1: @@
 == Overview ==
 Signal 내용 정리
@@ Line 93: / Line 90: @@
 | SIGUNUSED || - || 31 || - || Core || Synonymous with SIGSYS.
 |}
 == SIGHUP ==

Pchero: /* Signals */

2016-04-21T14:27:41Z

Signals

← Older revision		Revision as of 14:27, 21 April 2016
Line 15:		Line 15:
	{\| class="wikitable sortable"		{\| class="wikitable sortable"
	\|-		\|-
	! Signal !! data-sort-type="number"\|~~Portable~~ number !! Default Action !! class="unsortable"\|Description		! Signal !! data-sort-type="number"\|Alpha/Sparc !! data-sort-type="number"\|X86/ARM/Others !! data-sort-type="number"\|Mips !! Default Action !! class="unsortable"\|Description
	\|-		\|-
	\| SIGABRT \|\| 6 \|\| Core \|\| Abort signal from abort(3).		\| SIGABRT \|\| 6 \|\| 6 \|\| 6 \|\| Core \|\| Abort signal from abort(3).
	\|-		\|-
	\| SIGALRM \|\| 14 \|\| Term \|\| Timer signal from alarm(2).		\| SIGALRM \|\| 14 \|\| 14 \|\| 14 \|\| Term \|\| Timer signal from alarm(2).
	\|-		\|-
	\| SIGBUS \|\| 10, 7, 10 \|\| Core \|\| Bus error(bad memory access).		\| SIGBUS \|\| 10 \|\| 7 \|\| 10 \|\| Core \|\| Bus error(bad memory access).
	\|-		\|-
	\| SIGCHLD \|\| 20, 17, 18 \|\| Ign \|\| Child stopped or terminated.		\| SIGCHLD \|\| 20 \|\| 17 \|\| 18 \|\| Ign \|\| Child stopped or terminated.
	\|-		\|-
	\| SIGCONT \|\| 19, 18, 25 \|\| Cont \|\| Continue if stopped.		\| SIGCONT \|\| 19 \|\| 18 \|\| 25 \|\| Cont \|\| Continue if stopped.
	\|-		\|-
	\| SIGFPE \|\| 8 \|\| Core \|\| Floating point exception.		\| SIGFPE \|\| 8 \|\| 8 \|\| 8 \|\| Core \|\| Floating point exception.
	\|-		\|-
	\| SIGHUP \|\| 1 \|\| Term \|\| Hangup detected on controlling terminal or death of controlling process.		\| SIGHUP \|\| 1 \|\| 1 \|\| 1 \|\| Term \|\| Hangup detected on controlling terminal or death of controlling process.
	\|-		\|-
	\| SIGILL \|\| 4 \|\| Core \|\| Illegal instruction.		\| SIGILL \|\| 4 \|\| 4 \|\| 4 \|\| Core \|\| Illegal instruction.
	\|-		\|-
	\| SIGINT \|\| 2 \|\| Term \|\| Interrupt from keyboard		\| SIGINT \|\| 2 \|\| 2 \|\| 2 \|\| Term \|\| Interrupt from keyboard
	\|-		\|-
	\| SIGKILL \|\| 9 \|\| Term \|\| Kill signal		\| SIGKILL \|\| 9 \|\| 9 \|\| 9 \|\| Term \|\| Kill signal
	\|-		\|-
	\| SIGPIPE \|\| 13 \|\| Term \|\| Broken pipe: write to pipe with no readers.		\| SIGPIPE \|\| 13 \|\| 13 \|\| 13 \|\| Term \|\| Broken pipe: write to pipe with no readers.
	\|-		\|-
	\| SIGPOLL \|\| \|\| Term \|\| Pollable event(Sys V). Synonym for SIGIO.		\| SIGPOLL \|\| - \|\| - \|\| - \|\| Term \|\| Pollable event(Sys V). Synonym for SIGIO.
	\|-		\|-
	\| SIGPROF \|\| 27, 27, 29 \|\| Term \|\| Profiling timer expired.		\| SIGPROF \|\| 27 \|\| 27 \|\| 29 \|\| Term \|\| Profiling timer expired.
	\|-		\|-
	\| SIGQUIT \|\| 3 \|\| Core \|\| Quit from keyboard.		\| SIGQUIT \|\| 3 \|\| 3 \|\| 3 \|\| Core \|\| Quit from keyboard.
	\|-		\|-
	\| SIGSEGV \|\| 11 \|\| Core \|\| Invalid memory reference.		\| SIGSEGV \|\| 11 \|\| 11 \|\| 11 \|\| Core \|\| Invalid memory reference.
	\|-		\|-
	\| SIGSTOP \|\| 17, 19, 23 \|\| Stop \|\| Stop process		\| SIGSTOP \|\| 17 \|\| 19 \|\| 23 \|\| Stop \|\| Stop process
	\|-		\|-
	\| SIGSYS \|\| 12, 31, 12 \|\| Core \|\| Bad argument to routine(SVr4).		\| SIGSYS \|\| 12 \|\| 31 \|\| 12 \|\| Core \|\| Bad argument to routine(SVr4).
	\|-		\|-
	\| SIGTERM \|\| 15 \|\| Term \|\| Termination signal.		\| SIGTERM \|\| 15 \|\| 15 \|\| 15 \|\| Term \|\| Termination signal.
	\|-		\|-
	\| SIGTRAP \|\| 5 \|\| Core \|\| Trace/breakpoint trap.		\| SIGTRAP \|\| 5 \|\| 5 \|\| 5 \|\| Core \|\| Trace/breakpoint trap.
	\|-		\|-
	\| SIGTSTP \|\| 18, 20, 24 \|\| Stop \|\| Stop typed at terminal.		\| SIGTSTP \|\| 18 \|\| 20 \|\| 24 \|\| Stop \|\| Stop typed at terminal.
	\|-		\|-
	\| SIGTTIN \|\| 21, 21, 26 \|\| Stop \|\| Terminal input for background process.		\| SIGTTIN \|\| 21 \|\| 21 \|\| 26 \|\| Stop \|\| Terminal input for background process.
	\|-		\|-
	\| SIGTTOU \|\| 22, 22, 27 \|\| Stop \|\| Terminal output for background process.		\| SIGTTOU \|\| 22 \|\| 22 \|\| 27 \|\| Stop \|\| Terminal output for background process.
	\|-		\|-
	\| SIGUSR1 \|\| 30, 10, 16 \|\| Term \|\| User-defined signal 1.		\| SIGUSR1 \|\| 30 \|\| 10 \|\| 16 \|\| Term \|\| User-defined signal 1.
	\|-		\|-
	\| SIGUSR2 \|\| 31, 12, 17 \|\| Term \|\| User-defined signal 2.		\| SIGUSR2 \|\| 31 \|\| 12 \|\| 17 \|\| Term \|\| User-defined signal 2.
	\|-		\|-
	\| SIGURG \|\| 16, 23, 21 \|\| Ign \|\| Urgent condition on socket(4.2BSD).		\| SIGURG \|\| 16 \|\| 23 \|\| 21 \|\| Ign \|\| Urgent condition on socket(4.2BSD).
	\|-		\|-
	\| SIGVTALRM \|\| 26, 26, 28 \|\| Term \|\| Virtual alarm clock(4.2BSD).		\| SIGVTALRM \|\| 26 \|\| 26 \|\| 28 \|\| Term \|\| Virtual alarm clock(4.2BSD).
	\|-		\|-
	\| SIGXCPU \|\| 24, 24, 30 \|\| Core \|\| CPU time limit exceeded(4.2BSD).		\| SIGXCPU \|\| 24 \|\| 24 \|\| 30 \|\| Core \|\| CPU time limit exceeded(4.2BSD).
	\|-		\|-
	\| SIGXFSZ \|\| 25, 25, 31 \|\| Core \|\| File size limit exceeded(4.2BSD).		\| SIGXFSZ \|\| 25 \|\| 25 \|\| 31 \|\| Core \|\| File size limit exceeded(4.2BSD).
	\|-		\|-
	\| SIGIOT \|\| 6 \|\| Core \|\| IOT trap. A synonym for SIGABRT.		\| SIGIOT \|\| 6 \|\| 6 \|\| 6 \|\| Core \|\| IOT trap. A synonym for SIGABRT.
	\|-		\|-
	\| SIGEMT \|\| 7, -, 7 \|\| Term \|\|		\| SIGEMT \|\| 7 \|\| - \|\| 7 \|\| Term \|\|
	\|-		\|-
	\| SIGSTKFLT \|\| -, 16, - \|\| Term \|\| Stack fault on coprocessor(unused).		\| SIGSTKFLT \|\| - \|\| 16 \|\| - \|\| Term \|\| Stack fault on coprocessor(unused).
	\|-		\|-
	\| SIGIO \|\| 23, 29, 22 \|\| Term \|\| I/O now possible(4.2BSD).		\| SIGIO \|\| 23 \|\| 29 \|\| 22 \|\| Term \|\| I/O now possible(4.2BSD).
	\|-		\|-
	\| SIGCLD \|\| -, -, 18 \|\| Ign \|\| A synonym for SIGCHLD		\| SIGCLD \|\| - \|\| - \|\| 18 \|\| Ign \|\| A synonym for SIGCHLD
	\|-		\|-
	\| SIGPWR \|\| 29, 30, 19 \|\| Term \|\| Power failure(System V).		\| SIGPWR \|\| 29 \|\| 30 \|\| 19 \|\| Term \|\| Power failure(System V).
	\|-		\|-
	\| SIGINFO \|\| 29, -, - \|\| Term \|\| A synonym for SIGPWR.		\| SIGINFO \|\| 29 \|\| - \|\| - \|\| Term \|\| A synonym for SIGPWR.
	\|-		\|-
	\| SIGLOST \|\| -, -, - \|\| Term \|\| File lock lost(unused).		\| SIGLOST \|\| - \|\| - \|\| - \|\| Term \|\| File lock lost(unused).
	\|-		\|-
	\| SIGWINCH \|\| 28, 28, 20 \|\| Ign \|\| Window resize signal(4.3BSD, Sun).		\| SIGWINCH \|\| 28 \|\| 28 \|\| 20 \|\| Ign \|\| Window resize signal(4.3BSD, Sun).
	\|-		\|-
	\| SIGUNUSED \|\| -, 31, - \|\| Core \|\| Synonymous with SIGSYS.		\| SIGUNUSED \|\| - \|\| 31 \|\| - \|\| Core \|\| Synonymous with SIGSYS.
	\|}		\|}

Pchero: /* Signals */

2016-04-21T14:21:15Z

Signals

← Older revision		Revision as of 14:21, 21 April 2016
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	\| SIGTERM \|\| 15 \|\| Term \|\| Termination signal.		\| SIGTERM \|\| 15 \|\| Term \|\| Termination signal.
	\|-		\|-
	\| SIGTRAP \|\| 5 \|\| ~~Terminate (core dump)~~ \|\| Trace/breakpoint trap.		\| SIGTRAP \|\| 5 \|\| Core \|\| Trace/breakpoint trap.
	\|-		\|-
	\| SIGTSTP \|\| 18, 20, 24 \|\| Stop \|\| Stop typed at terminal.		\| SIGTSTP \|\| 18, 20, 24 \|\| Stop \|\| Stop typed at terminal.
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	\| SIGUSR2 \|\| 31, 12, 17 \|\| Term \|\| User-defined signal 2.		\| SIGUSR2 \|\| 31, 12, 17 \|\| Term \|\| User-defined signal 2.
	\|-		\|-
	\| SIGURG \|\| ~~n/a~~ \|\| ~~Ignore~~ \|\| ~~High bandwidth data is available at a~~ socket.		\| SIGURG \|\| 16, 23, 21 \|\| Ign \|\| Urgent condition on socket(4.2BSD).
	\|-		\|-
	\| SIGVTALRM \|\| ~~n/a~~ \|\| ~~Terminate~~ \|\| Virtual ~~timer expired~~.		\| SIGVTALRM \|\| 26, 26, 28 \|\| Term \|\| Virtual alarm clock(4.2BSD).
	\|-		\|-
	\| SIGXCPU \|\| ~~n/a~~ \|\| ~~Terminate (core dump)~~ \|\| CPU time limit exceeded.		\| SIGXCPU \|\| 24, 24, 30 \|\| Core \|\| CPU time limit exceeded(4.2BSD).
	\|-		\|-
	\| SIGXFSZ \|\| n/a \|\| ~~Terminate~~ (~~core dump~~) \|\| File ~~size limit exceeded~~		\| SIGXFSZ \|\| 25, 25, 31 \|\| Core \|\| File size limit exceeded(4.2BSD).
			\|-
			\| SIGIOT \|\| 6 \|\| Core \|\| IOT trap. A synonym for SIGABRT.
			\|-
			\| SIGEMT \|\| 7, -, 7 \|\| Term \|\|
			\|-
			\| SIGSTKFLT \|\| -, 16, - \|\| Term \|\| Stack fault on coprocessor(unused).
			\|-
			\| SIGIO \|\| 23, 29, 22 \|\| Term \|\| I/O now possible(4.2BSD).
			\|-
			\| SIGCLD \|\| -, -, 18 \|\| Ign \|\| A synonym for SIGCHLD
			\|-
			\| SIGPWR \|\| 29, 30, 19 \|\| Term \|\| Power failure(System V).
			\|-
			\| SIGINFO \|\| 29, -, - \|\| Term \|\| A synonym for SIGPWR.
			\|-
			\| SIGLOST \|\| -, -, - \|\| Term \|\| File lock lost(unused).
			\|-
			\| SIGWINCH \|\| 28, 28, 20 \|\| Ign \|\| Window resize signal(4.3BSD, Sun).
			\|-
			\| SIGUNUSED \|\| -, 31, - \|\| Core \|\| Synonymous with SIGSYS.
	\|}		\|}


	== SIGHUP ==		== SIGHUP ==

Pchero at 12:06, 21 April 2016

2016-04-21T12:06:27Z

@@ Line 1: / Line 1: @@
 == Overview ==
 Signal 내용 정리
 == SIGHUP ==

Pchero: /* SIGHUP */

2016-04-21T08:59:32Z

SIGHUP

← Older revision		Revision as of 08:59, 21 April 2016
Line 3:		Line 3:

	== SIGHUP ==		== SIGHUP ==
			접속된 Terminal 의 연결이 종료될 때 보내지는 signal 이다. 표준은 프로그램 종료이지만, 워낙 예전(표준이 없던 시절)부터 이 Signal 을 달리 처리하던 관습이 있어 많은 프로그램에서 SIGHUP 시그널을 달리 처리하고 있다. 특히 많은 DAEMON 프로그램에서는 설정 파일을 reload 하거나 logfile 을 reopen 하는 방식으로 구현하고 있다.

	== See also ==		== See also ==

Pchero at 13:49, 20 April 2016

2016-04-20T13:49:53Z

← Older revision		Revision as of 13:49, 20 April 2016
Line 1:		Line 1:
	== Overview ==		== Overview ==
	Signal 내용 정리		Signal 내용 정리

			== SIGHUP ==

			== See also ==
			* https://en.wikipedia.org/wiki/SIGHUP - SIGHUP

	[[category:linux]]		[[category:linux]]

← Older revision		Revision as of 12:03, 27 July 2016
Line 97:		Line 97:
	* https://en.wikipedia.org/wiki/SIGHUP - SIGHUP		* https://en.wikipedia.org/wiki/SIGHUP - SIGHUP

	[[category:~~linux~~]]		[[category:system]]