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/* setsig.c - Set a signal handler, trying to turning on the SA_RESTART bit
Copyright (C) 1997-2025 Free Software Foundation, Inc.
This file is part of GNU Inetutils.
GNU Inetutils is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
GNU Inetutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see `http://www.gnu.org/licenses/'. */
/* Written by Miles Bader. */
#include <config.h>
#include <stdlib.h>
#include <signal.h>
/* This is exactly like the traditional signal function, but turns on the
SA_RESTART bit where possible. */
sighandler_t
setsig (int sig, sighandler_t handler)
{
#ifdef HAVE_SIGACTION
struct sigaction sa, osa;
sigemptyset (&sa.sa_mask);
sigemptyset (&osa.sa_mask);
# ifdef SA_RESTART
sa.sa_flags |= SA_RESTART;
# endif
sa.sa_handler = handler;
if (sigaction (sig, &sa, &osa) < 0)
return SIG_ERR;
return osa.sa_handler;
#else /* !HAVE_SIGACTION */
# ifdef HAVE_SIGVEC
struct sigvec sv, osv;
sigemptyset (&sv.sv_mask);
sigemptyset (&osv.sv_mask);
sv.sv_handler = handler;
if (sigvec (sig, &sv, &osv) < 0)
return SIG_ERR;
return osv.sv_handler;
# else/* !HAVE_SIGVEC */
return signal (sig, handler);
# endif/* HAVE_SIGVEC */
#endif /* HAVE_SIGACTION */
}
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