1. signal ? ¶

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2. ��표�� signal ¶

SIGABRT - process aborted
SIGALRM - signal raised by alarm
SIGBUS - bus error "access to undefined portion of memory object"(SUS)
SIGCHLD - child process terminated, stopped (*or continued)
SIGCONT - continue if stopped
SIGFPE - floating point exception -- "erroneous arithmetic operation"(SUS)
SIGHUP - hangup
SIGILL - illegal instruction
SIGINT - interrupt
SIGKILL - kill
SIGPIPE - write to pipe with no one reading
SIGQUIT - quit
SIGSEGV - segmentation violation
SIGSTOP - stop executing
SIGTERM - termination
SIGTSTP - terminal stop signal
SIGTTIN - background process attempting to read ("in")
SIGTTOU - background process attempting to write ("out")
SIGUSR1 - user defined 1
SIGUSR2 - user defined 2
SIGURG - urgent data available on socket

SIGPOLL - pollable event
SIGPROF - profiling timer expired
SIGSYS - bad syscall
SIGTRAP - trace/breakpoint trap
SIGVTALRM - signal raised by timer counting virtual time -- "virtual timer expired"(SUS)
SIGXCPU - CPU time limit exceeded
SIGXFSZ - file size limit exceeded

3. sample code ¶

int signal() ��

~cpp
/**
code written by eternalbleu@gmail.com
desc: ctrl + c handling
**/
#include <stdio.h>
#include <unistd.h>
#include <signal.h>

void handler(int sig);

int main(int argc, char **argv)
{
	int state;
	int num = 0;

	signal(SIGINT, handler);

	while(1)
	{
		printf("%d : waiting \n", num ++);
		sleep(2);
		if(num > 5)
		break;
	}
	return 0;
}

void handler(int sig)
{
//	signal(SIGINT, handler);
	printf("which signal is passed : %d \n", sig);
}

int sigaction() ��

~cpp
/**
code written by eternalbleu@gmail.com
desc: ctrl + c handling
**/
#include <stdio.h>
#include <unistd.h>
#include <signal.h>

void handler(int sig);

int main(int argc, char **argv)
{
	int state;
	int num = 0;

	struct sigaction act;
	act.sa_handler	=	handler;
	sigemptyset(&act.sa_mask);
	act.sa_flags	=	0;

	state	=	sigaction(SIGINT, &act, 0);

	if (state != 0)
	{
		puts("sigaction() error");
		exit(1);
	}
		
	while(1)
	{
		printf("%d : waiting \n", num ++);
		sleep(2);
		if(num > 5)
		break;
	}
	return 0;
}

void handler(int sig)
{
	printf("which signal is passed : %d \n", sig);
}

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4. signal �� 한 �� ¶

~cpp
/**
code written by eternalbleu@gmail.com
desc: timer program that use SIGALRM signal.
**/
#include <stdio.h>
#include <unistd.h>
#include <signal.h>

void timer(int sig);

int main(int argc, char **argv)
{
	int state;
	int num = 0;

	struct sigaction act;
	act.sa_handler	=	timer;
	sigemptyset(&act.sa_mask);
	act.sa_flags	=	0;
	
	state	=	sigaction(SIGALRM, &act, 0);
	
	if (state != 0) {
		puts("sigaction() error");
		exit(1);
	}

	alarm(5);

	while(1) {
		puts("waiting");
		sleep(2);
	}
	return 0;
}

void timer(int sig)
{
	puts("this is time for you to reserve");
	exit(0);
}

----
LinuxProgramming

Linux Programming/Signal Handling

Contents

1. signal ? ¶

2. ��표�� signal ¶

3. sample code ¶

4. signal �� 한 �� ¶

Linux Programming/Signal Handling

Contents

1. signal ? ¶

2. ���표��� signal ¶

3. sample code ¶

4. signal ��� ������한 �������� ¶

2. ��표�� signal ¶

4. signal �� 한 �� ¶