|| Linux Programmer's Manual
NAME bsd_signal - signal handling with BSD semantics
/* See feature_test_macros(7) */
typedef void (*sighandler_t)(int);
() function takes the same arguments, and performs the same task, as
The difference between the two is that
() 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
(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
CONFORMING TO 4.2BSD, POSIX.1-2001. POSIX.1-2008 removes the specification of
bsd_signal(), recommending the use of
() should be avoided; use
On modern Linux systems,
(2) are equivalent. But on older systems,
(2) provided unreliable signal semantics; see
(2) for details.
The use of
is a GNU extension; this type is defined only if the
feature test macro is defined.
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/.