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| Problem | What is a signal and why does this matter for WebSphere Application Server? | | | | Solution | Signals are used for interprocess communication. For problem determination, it is often helpful to send signals to the WebSphere processes.
Signals- HUP 1 hangup
- INT 2 interrupt (rubout)
- QUIT 3 quit (ASCII FS)
- ILL 4 illegal instruction (not reset when caught)
- TRAP 5 trace trap (not reset when caught)
- IOT 6 IOT instruction
- ABRT 6 used by abort, replace SIGIOT in the future
- EMT 7 EMT instruction
- FPE 8 floating point exception
- KILL 9 kill (cannot be caught or ignored)
- BUS 10 bus error
- SEGV 11 segmentation violation
- SYS 12 bad argument to system call
- PIPE 13 write on a pipe with no one to read it
- ALRM 14 alarm clock
- TERM 15 software termination signal from kill
- USR1 16 user defined signal 1
- USR2 17 user defined signal 2
- CLD 18 child status change
- CHLD 18 child status change alias (POSIX)
- PWR 19 power-fail restart
- WINCH 20 window size change
- URG 21 urgent socket condition
- POLL 22 pollable event occured
- IO SIGPOLL socket I/O possible (SIGPOLL alias)
- STOP 23 stop (cannot be caught or ignored)
- TSTP 24 user stop requested from tty
- CONT 25 stopped process has been continued
- TTIN 26 background tty read attempted
- TTOU 27 background tty write attempted
- VTALRM 28 virtual timer expired
- PROF 29 profiling timer expired
- XCPU 30 exceeded cpu limit
- XFSZ 31 exceeded file size limit
- WAITING 32 process's lwps are blocked
- LWP 33 special signal used by thread library
- FREEZE 34 special signal used by CPR
- THAW 35 special signal used by CPR
See whitepaper on signals: http://www.ibm.com/support/docview.wss?rs=180&context=SSEQTP&uid=swg27003858
Each operating system has a unique list of signals. | |
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Product categories: Software, Application Servers, Distributed Application & Web Servers, WebSphere Application Server Operating system(s): AIX, Linux, Solaris Software version: 3.5, 4.0, 5.0, 5.1, 6.0 Software edition: Edition Independent Reference #: 1169590 IBM Group: Software Group Modified date: 2004-09-06
(C) Copyright IBM Corporation 2000, 2004. All Rights Reserved.
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