Originální popis anglicky:
bsd_signal - simplified signal facilities
Návod, kniha: POSIX Programmer's Manual
#include <signal.h>
void (*bsd_signal(int
sig, void
(*func )(int)))(int);
The
bsd_signal() function provides a partially compatible interface for
programs written to historical system interfaces (see APPLICATION USAGE).
The function call
bsd_signal(
sig,
func) shall be equivalent
to the following:
void (*bsd_signal(int sig, void (*func)(int)))(int)
{
struct sigaction act, oact;
act.sa_handler = func;
act.sa_flags = SA_RESTART;
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask, sig);
if (sigaction(sig, &act, &oact) == -1)
return(SIG_ERR);
return(oact.sa_handler);
}
The handler function should be declared:
where
sig is the signal number. The behavior is undefined if
func
is a function that takes more than one argument, or an argument of a different
type.
Upon successful completion,
bsd_signal() shall return the previous action
for
sig. Otherwise, SIG_ERR shall be returned and
errno shall be
set to indicate the error.
Refer to
sigaction() .
The following sections are informative.
None.
This function is a direct replacement for the BSD
signal() function for
simple applications that are installing a single-argument signal handler
function. If a BSD signal handler function is being installed that expects
more than one argument, the application has to be modified to use
sigaction(). The
bsd_signal() function differs from
signal() in that the SA_RESTART flag is set and the SA_RESETHAND is
clear when
bsd_signal() is used. The state of these flags is not
specified for
signal().
It is recommended that new applications use the
sigaction() function.
None.
None.
sigaction() ,
sigaddset() ,
sigemptyset() ,
signal()
, the Base Definitions volume of IEEE Std 1003.1-2001,
<signal.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.