NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON
BSD_SIGNAL(3) Linux Programmer's Manual BSD_SIGNAL(3)
bsd_signal - signal handling with BSD semantics
#define _XOPEN_SOURCE
#include <signal.h>
typedef void (*sighandler_t)(int);
sighandler_t bsd_signal(int signum, sighandler_t handler);
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.
The bsd_signal() function returns the previous value of the signal handler, or
SIG_ERR on error.
As for signal(2).
4.2BSD, POSIX.1-2001. POSIX.1-2008 removes the specification of bsd_signal(),
recommending the use of sigaction(2) instead.
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 only defined if the
_GNU_SOURCE feature test macro is defined.
sigaction(2), signal(2), sysv_signal(3), feature_test_macros(7), signal(7)
This page is part of release 3.23 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/.
2009-03-15 BSD_SIGNAL(3)