Language spec sez we must list exactly one parameter, even though we actually supply three. Ugh! SIG_HOLD is chosen to avoid KERN_SIG_* values in <sys/signalvar.h>

#define SIG_DFL (void (*)(int))0

macroSIG_IGN

#define SIG_IGN (void (*)(int))1

macroSIG_HOLD

#define SIG_HOLD (void (*)(int))5

macroSIG_ERR

#define SIG_ERR ((void (*)(int))-1)

unionsigval

size 8, align 8

int	sival_int	Members as suggested by Annex C of POSIX 1003.1b.
void *	sival_ptr

macroSIGEV_NONE

#define SIGEV_NONE 0

No async notification

macroSIGEV_SIGNAL

#define SIGEV_SIGNAL 1

aio - completion notification

macroSIGEV_THREAD

#define SIGEV_THREAD 3

[NOTIMP] [RTS] call notification function

macroSIGEV_KEVENT

#define SIGEV_KEVENT 4

Generate a kevent

structsigevent

size 32, align 8

int	sigev_notify	Notification type
int	sigev_signo	Signal number
union sigval	sigev_value	Signal value
void (*)(union sigval)	sigev_notify_function	Notification function
pthread_attr_t *	sigev_notify_attributes	Notification attributes

struct__siginfo

size 104, align 8

int	si_signo	signal number
int	si_errno	errno association
int	si_code	signal code
pid_t	si_pid	sending process
uid_t	si_uid	sender's ruid
int	si_status	exit value
void *	si_addr	faulting instruction
union sigval	si_value	signal value
long	si_band	band event for SIGPOLL
unsigned long[7]	__pad	Reserved for Future Use

typedefsiginfo_t

typedef struct __siginfo siginfo_t;

macroILL_NOOP

Codes for SIGILL

#define ILL_NOOP 0

if only I knew...

macroILL_ILLOPC

#define ILL_ILLOPC 1

[XSI] illegal opcode

macroILL_ILLTRP

#define ILL_ILLTRP 2

[XSI] illegal trap

macroILL_PRVOPC

#define ILL_PRVOPC 3

[XSI] privileged opcode

macroILL_ILLOPN

#define ILL_ILLOPN 4

[XSI] illegal operand -NOTIMP

macroILL_ILLADR

#define ILL_ILLADR 5

[XSI] illegal addressing mode -NOTIMP

macroILL_PRVREG

#define ILL_PRVREG 6

[XSI] privileged register -NOTIMP

macroILL_COPROC

#define ILL_COPROC 7

[XSI] coprocessor error -NOTIMP

macroILL_BADSTK

#define ILL_BADSTK 8

[XSI] internal stack error -NOTIMP

macroFPE_NOOP

Codes for SIGFPE

#define FPE_NOOP 0

if only I knew...

macroFPE_FLTDIV

#define FPE_FLTDIV 1

[XSI] floating point divide by zero

macroFPE_FLTOVF

#define FPE_FLTOVF 2

[XSI] floating point overflow

macroFPE_FLTUND

#define FPE_FLTUND 3

[XSI] floating point underflow

macroFPE_FLTRES

#define FPE_FLTRES 4

[XSI] floating point inexact result

macroFPE_FLTINV

#define FPE_FLTINV 5

[XSI] invalid floating point operation

macroFPE_FLTSUB

#define FPE_FLTSUB 6

[XSI] subscript out of range -NOTIMP

macroFPE_INTDIV

#define FPE_INTDIV 7

[XSI] integer divide by zero

macroFPE_INTOVF

#define FPE_INTOVF 8

[XSI] integer overflow

macroSEGV_NOOP

Codes for SIGSEGV

#define SEGV_NOOP 0

if only I knew...

macroSEGV_MAPERR

#define SEGV_MAPERR 1

[XSI] address not mapped to object

macroSEGV_ACCERR

#define SEGV_ACCERR 2

[XSI] invalid permission for mapped object

macroBUS_NOOP

Codes for SIGBUS

#define BUS_NOOP 0

if only I knew...

macroBUS_ADRALN

#define BUS_ADRALN 1

[XSI] Invalid address alignment

macroBUS_ADRERR

#define BUS_ADRERR 2

[XSI] Nonexistent physical address -NOTIMP

macroBUS_OBJERR

#define BUS_OBJERR 3

[XSI] Object-specific HW error - NOTIMP

macroTRAP_BRKPT

Codes for SIGTRAP

#define TRAP_BRKPT 1

[XSI] Process breakpoint -NOTIMP

macroTRAP_TRACE

#define TRAP_TRACE 2

[XSI] Process trace trap -NOTIMP

macroCLD_NOOP

Codes for SIGCHLD

#define CLD_NOOP 0

if only I knew...

macroCLD_EXITED

#define CLD_EXITED 1

[XSI] child has exited

macroCLD_KILLED

#define CLD_KILLED 2

[XSI] terminated abnormally, no core file

macroCLD_DUMPED

#define CLD_DUMPED 3

[XSI] terminated abnormally, core file

macroCLD_TRAPPED

#define CLD_TRAPPED 4

[XSI] traced child has trapped

macroCLD_STOPPED

#define CLD_STOPPED 5

[XSI] child has stopped

macroCLD_CONTINUED

#define CLD_CONTINUED 6

[XSI] stopped child has continued

macroPOLL_IN

Codes for SIGPOLL

#define POLL_IN 1

[XSR] Data input available

macroPOLL_OUT

#define POLL_OUT 2

[XSR] Output buffers available

macroPOLL_MSG

#define POLL_MSG 3

[XSR] Input message available

macroPOLL_ERR

#define POLL_ERR 4

[XSR] I/O error

macroPOLL_PRI

#define POLL_PRI 5

[XSR] High priority input available

macroPOLL_HUP

#define POLL_HUP 6

[XSR] Device disconnected

union__sigaction_u

union for signal handlers

size 8, align 8

void (*)(int)	__sa_handler
void ()(int, struct __siginfo , void *)	__sa_sigaction

struct__sigaction

Signal vector template for Kernel user boundary

size 24, align 8

union __sigaction_u	__sigaction_u	signal handler
void ()(void , int, int, siginfo_t , void )	sa_tramp
sigset_t	sa_mask	signal mask to apply
int	sa_flags	see signal options below

structsigaction

Signal vector "template" used in sigaction call.

size 16, align 8

union __sigaction_u	__sigaction_u	signal handler
sigset_t	sa_mask	signal mask to apply
int	sa_flags	see signal options below

macrosa_handler

if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler.

#define sa_handler __sigaction_u.__sa_handler

macrosa_sigaction

#define sa_sigaction __sigaction_u.__sa_sigaction

macroSA_ONSTACK

#define SA_ONSTACK 0x0001

take signal on signal stack

macroSA_RESTART

#define SA_RESTART 0x0002

restart system on signal return

macroSA_RESETHAND

#define SA_RESETHAND 0x0004

reset to SIG_DFL when taking signal

macroSA_NOCLDSTOP

#define SA_NOCLDSTOP 0x0008

do not generate SIGCHLD on child stop

macroSA_NODEFER

#define SA_NODEFER 0x0010

don't mask the signal we're delivering

macroSA_NOCLDWAIT

#define SA_NOCLDWAIT 0x0020

don't keep zombies around

macroSA_SIGINFO

#define SA_SIGINFO 0x0040

signal handler with SA_SIGINFO args

macroSA_USERTRAMP

#define SA_USERTRAMP 0x0100

do not bounce off kernel's sigtramp

macroSA_64REGSET

This will provide 64bit register set in a 32bit user address space

#define SA_64REGSET 0x0200

signal handler with SA_SIGINFO args with 64bit regs information

macroSA_USERSPACE_MASK

the following are the only bits we support from user space, the rest are for kernel use only.

#define SA_USERSPACE_MASK (SA_ONSTACK | SA_RESTART | SA_RESETHAND | SA_NOCLDSTOP | SA_NODEFER | SA_NOCLDWAIT | SA_SIGINFO)

macroSIG_BLOCK

Flags for sigprocmask:

#define SIG_BLOCK 1

block specified signal set

macroSIG_UNBLOCK

#define SIG_UNBLOCK 2

unblock specified signal set

macroSIG_SETMASK

#define SIG_SETMASK 3

set specified signal set

macroSI_USER

POSIX 1003.1b required values.

#define SI_USER 0x10001

[CX] signal from kill()

macroSI_QUEUE

#define SI_QUEUE 0x10002

[CX] signal from sigqueue()

macroSI_TIMER

#define SI_TIMER 0x10003

[CX] timer expiration

macroSI_ASYNCIO

#define SI_ASYNCIO 0x10004

[CX] aio request completion

macroSI_MESGQ

#define SI_MESGQ 0x10005

[CX] from message arrival on empty queue

typedefsig_t

typedef void (*sig_t)(int)

type of signal function

macroSS_ONSTACK

#define SS_ONSTACK 0x0001

take signal on signal stack

macroSS_DISABLE

#define SS_DISABLE 0x0004

disable taking signals on alternate stack

macroMINSIGSTKSZ

#define MINSIGSTKSZ 32768

(32K)minimum allowable stack

macroSIGSTKSZ

#define SIGSTKSZ 131072

(128K)recommended stack size

structsigvec

4.3 compatibility: Signal vector "template" used in sigvec call.

size 16, align 8

void (*)(int)	sv_handler	signal handler
int	sv_mask	signal mask to apply
int	sv_flags	see signal options below

macroSV_ONSTACK

#define SV_ONSTACK SA_ONSTACK

macroSV_INTERRUPT

#define SV_INTERRUPT SA_RESTART

same bit, opposite sense

macroSV_RESETHAND

#define SV_RESETHAND SA_RESETHAND

macroSV_NODEFER

#define SV_NODEFER SA_NODEFER

macroSV_NOCLDSTOP

#define SV_NOCLDSTOP SA_NOCLDSTOP

macroSV_SIGINFO

#define SV_SIGINFO SA_SIGINFO

macrosv_onstack

#define sv_onstack sv_flags

isn't compatibility wonderful!

structsigstack

Structure used in sigstack call.

size 16, align 8

char *	ss_sp	signal stack pointer
int	ss_onstack	current status

macrosigmask

Macro for converting signal number to a mask suitable for sigblock().

#define sigmask(m) (1 << ((m)-1))

macroBADSIG

#define BADSIG SIG_ERR

functionsignal

)(int)
void(*signal(int, void (*)(int))

man page · June 7, 2004

signal(3) — simplified software signal facilities