UNIX signal

.core 덤프를 찾기 위해서

ulimit -c unlimited 를 실행하게 되면 core가 떨어지게 되며 해당 코어에 대해서 gdb 실행 실행.core 로

segv를 확인할 수 있다.

1. SIGHUP: 연결된terminal이hangup하였을때(terminate)

2. SIGINT: interrupt key(^C)를입력하였을때(terminate)

3. SIGQUIT: quit key(^\)를입력하였을때(terminate+core)

4. SIGILL: illegal instruction을수행하였을때(terminate+core)

5. SIGTRAP: implementation defined hardware fault (terminate+core)

6. SIGABRT: abort시스템호출을불렀을때(terminate+core)

7. SIGBUS: implementation defined hardware fault (terminate+core)

8. SIGFPE: arithmetic exception, /0, floating-point overflow (terminate+core)

9. SIGKILL: process를kill하기위핚signal, catch 혹은ignore될수없는signal임(terminate)

10. SIGUSR1: user defined signal 1 (terminate)

11. SIGSEGV: invalid memory reference (terminate+core)

12. SIGUSR2: user defined signal 2 (terminate)

13. SIGPIPE: reader가terminate된pipe에write핚경우발생(terminate)

14. SIGALRM: alarm시스템호출후timer가expire된경우(terminate)

15. SIGTERM: kill시스템호출이보내는software termination signal (terminate)

16. SIGCHLD: child가stop or exit되었을때parent에게전달되는신호(ignore)

17. SIGCONT: continue a stopped process (continue/ignore)

18. SIGSTOP: sendable stop signal, cannot be caught or ignored (stop process)

19. SIGTSTP: stop key(^Z)를입력하였을때(stop process)

20. SIGTTIN: background process가control tty로부터read핛경우(stop process)

21. SIGTTOU: background process가control tty로write핛경우(stop process)

22. SIGURG: urgent condition on IO, socket의OOB data (ignore)

23. SIGXCPU: exceeded CPU time limit (terminate+core/ignore)

24. SIGXFSZ: exceeded file size limit (terminate+core/ignore)

25. SIGVTALRM: virtual time alarm, setitimer, (terminate)

26. SIGPROF: profiling time alarm, setitimer, (terminate)

27. SIGWINCH: terminal window size changed, (ignore)

28. SIGIO: 어떤fd에서asynchronous I/O event가발생하였을경우(terminate/ignore)

29. SIGPWR: system power fail (terminate/ignore)

30. SIGSYS: bad argument to system call (terminate+core)

기본적인 Signal 처리 방식은 아래와 같다.

1. SIG_DFL (SIG_PF)0

2. SIG_ERR (SIG_PF)-1

3. SIG_IGN (SIG_PF)1

4. SIG_HOLD (SIG_PF)2