Section (3) bsd_signal
bsd_signal — signal handling with BSD semantics
#include <signal.h> typedef void (*sighandler_t)(int);
takes the same arguments, and performs the same task, as
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
returns the previous value of the signal handler, or
SIG_ERR on error.
As for signal(2).
For an explanation of the terms used in this section, see attributes(7).
4.2BSD, POSIX.1-2001. POSIX.1-2008 removes the
recommending the use of sigaction(2) instead.
be avoided; use sigaction(2) instead.
The use of sighandler_t is a GNU
extension; this type is defined only if the
_GNU_SOURCE feature test macro is
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