Signal catching

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LEARN ABOUT NETBSD

raise_default_signal

RAISE_DEFAULT_SIGNAL(3) 				   BSD Library Functions Manual 				   RAISE_DEFAULT_SIGNAL(3)

NAME

     raise_default_signal -- raise the default signal handler

LIBRARY

     System Utilities Library (libutil, -lutil)

SYNOPSIS

     #include <util.h>

     int
     raise_default_signal(int sig);

DESCRIPTION

     The raise_default_signal() function raises the default signal handler for the signal sig.	This function may be used by a user-defined signal
     handler router to ensure that a parent process receives the correct notification of a process termination by a signal.  This can be used to
     avoid a common programming mistake when terminating a process from a custom SIGINT or SIGQUIT signal handler.

     The operations performed are:

	   1.	Block all signals, using sigprocmask(2).

	   2.	Set the signal handler for signal sig to the default signal handler (SIG_DFL).

	   3.	raise(3) signal sig.

	   4.	Unblock signal sig to deliver it.

	   5.	Restore the original signal mask and handler, even if there was a failure.

     See signal(7) for a table of signals and default actions.

     The raise_default_signal() function should be async-signal-safe.

RETURN VALUES

     Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned and the global variable errno is set to indicate
     the error.

ERRORS

     The raise_default_signal() function may fail and set errno for any of the errors specified for the functions sigemptyset(3), sigfillset(3),
     sigaddset(3), sigprocmask(2), sigaction(2), or raise(3).

SEE ALSO

     sigaction(2), sigprocmask(2), raise(3), signal(7)

HISTORY

     The raise_default_signal() function first appeared in NetBSD 5.0.

BSD
								September 25, 2007							       BSD

Programming