signal.h File Reference

#include <stdint.h>
#include "stdio.h"
#include "micros.h"

Go to the source code of this file.

Macros
#define	SIGABRT   0
	(Signal Abort) Abnormal termination, such as is initiated by the abort function. More...
#define	SIGFPE   1
	(Signal Floating-Point Exception) Erroneous arithmetic operation, such as zero divide or an operation resulting in overflow (not necessarily with a floating-point operation). More...
#define	SIGILL   2
	(Signal Illegal Instruction) Invalid function image, such as an illegal instruction. This is generally due to a corruption in the code or to an attempt to execute data. More...
#define	SIGINT   3
	(Signal Interrupt) Interactive attention signal. Generally generated by the application user. More...
#define	SIGSEGV   4
	(Signal Segmentation Violation) Invalid access to storage: When a program tries to read or write outside the memory it has allocated. More...
#define	SIGTERM   5
	(Signal Terminate) Termination request sent to program. More...
#define	SIG_IGN   0
	Ignore Signal: The signal is ignored. More...
#define	SIG_DFL   1
	Default handling: The signal is handled by the default action for that particular signal. More...
#define	SIG_ERR   2
	Special return value indicating failure. More...

Typedefs
typedef int32_t	sig_atomic_t
	Integral type. More...
typedef void(*	signal_func) (int)
	Signal function signature. More...

Functions
int	raise (int sig)
	Generates a signal. More...
int	raise_with_param (int sig, int param)
	Generates a signal with the specified parameter. More...
void	default_sigabrt_handler (int param)
	Default signal handle for SIGABRT. More...
void	default_sigfpe_handler (int param)
	Default signal handle for SIGFPE. More...
void	default_sigill_handler (int param)
	Default signal handle for SIGILL. More...
void	default_sigint_handler (int param)
	Default signal handle for SIGINT. More...
void	default_sigsegv_handler (int param)
	Default signal handle for SIGSEGV. More...
void	default_sigterm_handler (int param)
	Default signal handle for SIGTERM. More...
void	__signal_init ()
	Initialize default signal handlers. More...
signal_func	__signal_get_defualt_handler (int sig)
	Get default handler for the specified signal. More...

Variables
signal_func	signal_handlers [6]
	Array containing all signal handlers. More...
void(*)(int)	signal (int sig, signal_func func)
	Set function to handle signal. More...

Macro Definition Documentation

SIG_DFL

#define SIG_DFL   1

Default handling: The signal is handled by the default action for that particular signal.

SIG_ERR

#define SIG_ERR   2

Special return value indicating failure.

SIG_IGN

#define SIG_IGN   0

Ignore Signal: The signal is ignored.

SIGABRT

#define SIGABRT   0

(Signal Abort) Abnormal termination, such as is initiated by the abort function.

SIGFPE

#define SIGFPE   1

(Signal Floating-Point Exception) Erroneous arithmetic operation, such as zero divide or an operation resulting in overflow (not necessarily with a floating-point operation).

SIGILL

#define SIGILL   2

(Signal Illegal Instruction) Invalid function image, such as an illegal instruction. This is generally due to a corruption in the code or to an attempt to execute data.

SIGINT

#define SIGINT   3

(Signal Interrupt) Interactive attention signal. Generally generated by the application user.

SIGSEGV

#define SIGSEGV   4

(Signal Segmentation Violation) Invalid access to storage: When a program tries to read or write outside the memory it has allocated.

SIGTERM

#define SIGTERM   5

(Signal Terminate) Termination request sent to program.

Typedef Documentation

sig_atomic_t

typedef int32_t sig_atomic_t

Integral type.

Integral type of an object that can be accessed as an atomic entity, even in the presence of asynchronous signals. !

signal_func

typedef void(* signal_func) (int)

Signal function signature.

Function Documentation

__signal_get_defualt_handler()

signal_func __signal_get_defualt_handler

(

int

sig

)

Get default handler for the specified signal.

Gets default signal handler based on the passed signal type.

__signal_init()

void __signal_init

(

)

Initialize default signal handlers.

Assign default signal handlers to the internal array.

default_sigabrt_handler()

void default_sigabrt_handler

(

int

param

)

Default signal handle for SIGABRT.

This handler can be set by passing SIG_DFL in sig parameter in signal function.

Parameters

param

Signal parameter.

default_sigfpe_handler()

void default_sigfpe_handler

(

int

param

)

Default signal handle for SIGFPE.

This handler can be set by passing SIG_DFL in sig parameter in signal function.

Parameters

param

Signal parameter.

default_sigill_handler()

void default_sigill_handler

(

int

param

)

Default signal handle for SIGILL.

This handler can be set by passing SIG_DFL in sig parameter in signal function.

Parameters

param

Signal parameter.

default_sigint_handler()

void default_sigint_handler

(

int

param

)

Default signal handle for SIGINT.

This handler can be set by passing SIG_DFL in sig parameter in signal function.

Parameters

param

Signal parameter.

default_sigsegv_handler()

void default_sigsegv_handler

(

int

param

)

Default signal handle for SIGSEGV.

This handler can be set by passing SIG_DFL in sig parameter in signal function.

Parameters

param

Signal parameter.

default_sigterm_handler()

void default_sigterm_handler

(

int

param

)

Default signal handle for SIGTERM.

This handler can be set by passing SIG_DFL in sig parameter in signal function.

Parameters

param

Signal parameter.

raise()

int raise

(

int

sig

)

Generates a signal.

The signal value to raise.

Parameters

sig	The signal value to which a handling function is set.

Returns

Returns zero if successful, and a value different from zero otherwise.

raise_with_param()

int raise_with_param	(	int	sig,
		int	param
	)

Generates a signal with the specified parameter.

The signal value to raise.

Parameters

sig	The signal value to which a handling function is set.
param	The signal parameter.

Returns

Returns zero if successful, and a value different from zero otherwise.

Variable Documentation

signal

void(*)(int) signal(int sig, signal_func func)

Set function to handle signal.

Specifies a way to handle the signals with the signal number specified by sig.

Parameters

sig	The signal value to which a handling function is set.
func	A pointer to a function. This may either be a function defined by the programmer or one of the following predefined functions: SIG_DFL (handle) or SIG_IGN (ignore).

Returns

If the request is successful, the function returns a pointer to the particular handler function which was in charge of handling this signal before the call, if any. Or either SIG_DFL or SIG_IGN if before the call the signal was being handled by the default handler or was being ignored, respectivelly. If the function was not successful in registering the new signal handling procedure, it returns SIG_ERR and errno may be set to a positive value.

signal_handlers

signal_func signal_handlers[6]

Array containing all signal handlers.