The first 31 signals in Linux/i386

#

Signal name

Default action

Comment

POSIX

1

SIGHUP

Terminate

Hang up controlling terminal or process

Yes

2

SIGINT

Terminate

Interrupt from keyboard

Yes

3

SIGQUIT

Dump

Quit from keyboard

Yes

4

SIGILL

Dump

Illegal instruction

Yes

5

SIGTRAP

Dump

Breakpoint for debugging

No

6

SIGABRT

Dump

Abnormal termination

Yes

6

SIGIOT

Dump

Equivalent to SIGABRT

No

7

SIGBUS

Dump

Bus error

No

8

SIGFPE

Dump

Floating-point exception

Yes

9

SIGKILL

Terminate

Forced-process termination

Yes

10

SIGUSR1

Terminate

Available to processes

Yes

11

SIGSEGV

Dump

Invalid memory reference

Yes

12

SIGUSR2

Terminate

Available to processes

Yes

13

SIGPIPE

Terminate

Write to pipe with no readers

Yes

14

SIGALRM

Terminate

Real-timerclock

Yes

15

SIGTERM

Terminate

Process termination

Yes

16

SIGSTKFLT

Terminate

Coprocessor stack error

No

17

SIGCHLD

Ignore

Child process stopped or terminated, or got signal if traced

Yes

18

SIGCONT

Continue

Resume execution, if stopped

Yes

19

SIGSTOP

Stop

Stop process execution

Yes

20

SIGTSTP

Stop

Stop process issued from tty

Yes

21

SIGTTIN

Stop

Background process requires input

Yes

22

SIGTTOU

Stop

Background process requires output

Yes

23

SIGURG

Ignore

Urgent condition on socket

No

24

SIGXCPU

Dump

CPU time limit exceeded

No

25

SIGXFSZ

Dump

File size limit exceeded

No

26

SIGVTALRM

Terminate

Virtual timer clock

No

27

SIGPROF

Terminate

Profile timer clock

No

28

SIGWINCH

Ignore

Window resizing

No

29

SIGIO

Terminate

I/O now possible

No

29

SIGPOLL

Terminate

Equivalent to SIGIO

No

30

SIGPWR

Terminate

Power supply failure

No

31

SIGSYS

Dump

Bad system call

No

31

SIGUNUSED

Dump

Equivalent to SIGSYS

No