alp-apC-signal-table(2).pdf

Table of Signals

T ABLE C.1 LISTS SOME OF THE L INUX SIGNALS YOU ’ RE MOST LIKELY to encounter or

use. Note that some signals have multiple interpretations, depending on where they

occur.

The names of the signals listed here are deﬁned as preprocessor macros.To

use them in your program, include <signal.h> .The actual deﬁnitions are in

/usr/include/sys/signum.h , which is included as part of <signal.h> .

For a full list of Linux signals, including a short description of each and the default

behavior when the signal is delivered, consult the signal man page in Section 7 by

invoking the following:

% man 7 signal

Table C.1 Linux Signals

Name

Description

SIGHUP

Linux sends a process this signal when it becomes disconnected

from a terminal. Many Linux programs use SIGHUP for an unre-

lated purpose: to indicate to a running program that it should

reread its conﬁguration ﬁles.

continues

302 Appendix C Table of Signals

Table C.1 Continued

Name

Description

SIGINT

Linux sends a process this signal when the user tries to end it by

pressing Ctrl+C.

SIGILL

A process gets this signal when it attempts to execute an illegal

instruction.This could indicate that the program’s stack is

corrupted.

SIGABRT

The abort function causes the process to receive this signal.

SIGFPE

The process has executed an invalid ﬂoating-point math instruc-

tion. Depending on how the CPU is conﬁgured, an invalid

ﬂoating-point operation may return a special non-number value

such as inf (inﬁnity) or NaN (not a number) instead of raising

SIGFPE .

SIGKILL

This signal ends a process immediately and cannot be handled.

SIGUSR1

This signal is reserved for application use.

SIGUSR2

This signal is reserved for application use.

SIGSEGV

The program attempted an invalid memory access.The access

may be to an address that is invalid in the process’s virtual mem-

ory space, or the access may be forbidden by the target memory’s

permissions. Dereferencing a “wild pointer” can cause a SIGSEGV .

SIGPIPE

The program has attempted to access a broken data stream, such

as a socket connection that has been closed by the other party.

SIGALRM

The alarm system call schedules the delivery of this signal at a

later time. See Section 8.13, “ setitimer : Setting Interval Timers,”

in Chapter 8, “Linux System Calls,” for information about

setitimer , a generalized version of alarm .

SIGTERM

This signal requests that a process terminate.This is the default

signal sent by the kill command.

SIGCHLD

Linux sends a process this signal when a child process exits. See

Section 3.4.4, “Cleaning Up Children Asynchronously,” in

Chapter 3, “Processes.”

SIGXCPU

Linux sends a process this signal when it exceeds the limit of

CPU time that it can consume. See Section 8.5, “ getrlimit and

setrlimit : Resource Limits,” in Chapter 8 for information on

CPU time limits.

SIGVTALRM

The setitimer schedules the delivery of this signal at a future

time. See Section 8.13, “ setitimer : Setting Interval Timers.”

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