Signal: Difference between revisions

From 탱이의 잡동사니
Jump to navigation Jump to search
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.
|}
|}


Revision as of 14:27, 21 April 2016

Overview

Signal 내용 정리

Overview

Signal 내용 정리

Signals

  • 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.
Signal Alpha/Sparc X86/ARM/Others Mips Default Action Description
SIGABRT 6 6 6 Core Abort signal from abort(3).
SIGALRM 14 14 14 Term Timer signal from alarm(2).
SIGBUS 10 7 10 Core Bus error(bad memory access).
SIGCHLD 20 17 18 Ign Child stopped or terminated.
SIGCONT 19 18 25 Cont Continue if stopped.
SIGFPE 8 8 8 Core Floating point exception.
SIGHUP 1 1 1 Term Hangup detected on controlling terminal or death of controlling process.
SIGILL 4 4 4 Core Illegal instruction.
SIGINT 2 2 2 Term Interrupt from keyboard
SIGKILL 9 9 9 Term Kill signal
SIGPIPE 13 13 13 Term Broken pipe: write to pipe with no readers.
SIGPOLL - - - Term Pollable event(Sys V). Synonym for SIGIO.
SIGPROF 27 27 29 Term Profiling timer expired.
SIGQUIT 3 3 3 Core Quit from keyboard.
SIGSEGV 11 11 11 Core Invalid memory reference.
SIGSTOP 17 19 23 Stop Stop process
SIGSYS 12 31 12 Core Bad argument to routine(SVr4).
SIGTERM 15 15 15 Term Termination signal.
SIGTRAP 5 5 5 Core Trace/breakpoint trap.
SIGTSTP 18 20 24 Stop Stop typed at terminal.
SIGTTIN 21 21 26 Stop Terminal input for background process.
SIGTTOU 22 22 27 Stop Terminal output for background process.
SIGUSR1 30 10 16 Term User-defined signal 1.
SIGUSR2 31 12 17 Term User-defined signal 2.
SIGURG 16 23 21 Ign Urgent condition on socket(4.2BSD).
SIGVTALRM 26 26 28 Term Virtual alarm clock(4.2BSD).
SIGXCPU 24 24 30 Core CPU time limit exceeded(4.2BSD).
SIGXFSZ 25 25 31 Core File size limit exceeded(4.2BSD).
SIGIOT 6 6 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

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


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

Retrieved from "http://wiki.pchero21.com/index.php?title=Signal&oldid=876"