Signalling a process

In the Process Manager, select Process Signal. This function is intended for more knowledgeable users. You can test a program by sending signals to the process and checking the responses. See ``Signals'' for more information.

The most commonly used signal is KILL, used to terminate a process.

Types of signals

Signal	Purpose
HUP	hangup
INT	interrupt
QUIT	quit
ILL	illegal instruction (not reset when caught)
TRAP	trace trap (not reset when caught)
ABRT	IOT instruction
EMT	EMT instruction
FPE	floating point exception
KILL	kill (cannot be caught or ignored)
BUS	bus error
SEGV	segmentation violation
SYS	bad argument to system call
PIPE	write on a pipe with no one to read it
ALRM	alarm clock
TERM	software termination signal
USR1	user-defined signal 1
USR2	user-defined signal 2
CHLD	death of a child
PWR	power fail
WINCH	window change
POLL	selectable event pending
STOP	sendable stop signal not from tty
TSTP	stop signal from tty
CONT	continue a stopped process
TTIN	background tty read attempt
TTOU	background tty write attempt
VTALRM	virtual timer alarm
PROF	profile alarm
XCPU	exceeded CPUlimit
XFSZ	exceeded file size limit
WAITING	all lightweight processes blocked interruptibly notification
LWP	signal reserved for thread library implementation
AIO	asynchronous I/O signal

 Signal    Purpose
 HUP       hangup
 INT       interrupt
 QUIT      quit
 ILL       illegal instruction (not reset when caught)
 TRAP      trace trap (not reset when caught)
 ABRT      IOT instruction
 EMT       EMT instruction
 FPE       floating point exception
 KILL      kill (cannot be caught or ignored)
 BUS       bus error
 SEGV      segmentation violation
 SYS       bad argument to system call
 PIPE      write on a pipe with no one to read it
 ALRM      alarm clock
 TERM      software termination signal
 USR1      user-defined signal 1
 USR2      user-defined signal 2
 CHLD      death of a child
 PWR       power fail
 WINCH     window change
 POLL      selectable event pending
 STOP      sendable stop signal not from tty
 TSTP      stop signal from tty
 CONT      continue a stopped process
 TTIN      background tty read attempt
 TTOU      background tty write attempt
 VTALRM    virtual timer alarm
 PROF      profile alarm
 XCPU      exceeded CPUlimit
 XFSZ      exceeded file size limit
 WAITING   all lightweight processes blocked interruptibly notification
 LWP       signal reserved for thread library implementation
 AIO       asynchronous I/O signal

See also:

• kill(1)