Set signal handling

This function is compatible with the following targets:

ANSI

BeOS

EMB/RTOS

Mac OS

Palm OS

Win32

#include <signal.h>

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

Parameters for this facility are:

sig	int	A number associated with the signal handling function
func	void *	A pointer to a signal handling function

The signal() function returns a pointer to a signal handling routine that takes an int value argument.

The sig argument is the signal number associated with the signal handling function. The signals defined in signal.h are listed in "signal.h Signal descriptions".

The func argument is the signal handling function. This function is either programmer-supplied or one of the pre-defined signal handlers described in "Signal function handling arguments".

When it is raised, a signal handler's execution is preceded by the invocation of signal(sig, SIG_DFL). This call to signal() effectively disables the user's handler. It can be reinstalled by placing a call within the user handler to signal() with the user's handler as its function argument.

signal() returns a pointer to the signal handling function set by the last call to signal() for signal sig. If the request cannot be honored, signal() returns SIG_ERR.

"raise"

"abort"

"atexit"

"exit"

#include <signal.h>
#include <stdio.h>
#include <stdlib.h>

void userhandler(int);

void userhandler(int sig)
{
	char c;

	printf("userhandler!\nPress return.\n");

	/* wait for the return key to be pressed */
	c = getchar();
}
int main(void)
{
	void (*handlerptr)(int);
	int i;
	
	handlerptr = signal(SIGINT, userhandler);
	if (handlerptr  == SIG_ERR)
		printf("Can't assign signal handler.\n");

	for (i = 0; i < 10; i++) {
		printf("%d\n", i);
		if (i == 5) raise(SIGINT);
	}

	return 0;
}
Output:

0
1
2
3
4
5
userhandler!
Press return.

6
7
8
9





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Last updated: August 16, 2000