SIGACTION

Section: Linux Programmer's Manual (2)
Updated: 24 September 1994
Index Return to Main Contents

 

NAME

signal - ANSI C signal handling.

 

SYNOPSIS

#include <signal.h>

void (*signal(int signum, void (*handler)(int)))(int);

 

DESCRIPTION

The signal system call installs a new signal handler for signal signum. The signal handler is set to handler which may be a user specified function, or one of the following:
SIG_IGN
Ignore the signal.
SIG_DFL
Reset the signal to its default behavior.

 

RETURN VALUE

signal returns the previous value of the signal handler, or SIG_ERR on error.

 

NOTES

Signal handlers cannot be set for SIGKILL or SIGSTOP.

Unlike BSD systems, signals under Linux are reset to their default behavior when raised.

If you're confused by the prototype at the top of this manpage, it may help to see it separated out thus:

typedef void (*sighandler_t)(int);
sighandler_t signal(int signum, sighandler_t handler);

 

CONFORMING TO

ANSI C

 

SEE ALSO

kill(1), kill(2), killpg(2), pause(2), raise(3), sigaction(2), signal(7), sigsetops(3), sigvec(2)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
NOTES
CONFORMING TO
SEE ALSO

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