BSD_SIGNAL(3) |
Linux Programmer's Manual |
BSD_SIGNAL(3) |
NAME
bsd_signal - signal handling with BSD semantics
SYNOPSIS
#define _XOPEN_SOURCE /* See feature_test_macros(7) */
#include <signal.h>
typedef void (*sighandler_t)(int);
sighandler_t bsd_signal(int
signum
, sighandler_t
handler
);
DESCRIPTION
The
bsd_signal() function takes the same arguments, and performs the same task, as
signal(2).
The difference between the two is that
bsd_signal() is guaranteed to provide reliable signal semantics, that is: a) the disposition of the signal is not reset to the default when the handler is invoked; b) delivery of further instances of the signal is blocked while the signal handler is executing; and c) if the handler interrupts a blocking system call, then the system call is automatically restarted. A portable application cannot rely on
signal(2) to provide these guarantees.
RETURN VALUE
The
bsd_signal() function returns the previous value of the signal handler, or
SIG_ERR on error.
ERRORS
As for
signal(2).
CONFORMING TO
4.2BSD, POSIX.1-2001. POSIX.1-2008 removes the specification of
bsd_signal(), recommending the use of
sigaction(2) instead.
NOTES
Use of
bsd_signal() should be avoided; use
sigaction(2) instead.
On modern Linux systems,
bsd_signal() and
signal(2) are equivalent. But on older systems,
signal(2) provided unreliable signal semantics; see
signal(2) for details.
The use of
sighandler_t is a GNU extension; this type is defined only if the
_GNU_SOURCE feature test macro is defined.
SEE ALSO
sigaction(2),
signal(2),
sysv_signal(3),
signal(7)
COLOPHON
This page is part of release 3.53 of the Linux
man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.