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59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/* setsig.c - Set a signal handler, trying to turning on the SA_RESTART bit
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Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016,
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2017, 2018, 2019, 2020, 2021 Free Software Foundation, Inc.
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This file is part of GNU Inetutils.
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GNU Inetutils is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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GNU Inetutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see `http://www.gnu.org/licenses/'. */
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/* Written by Miles Bader. */
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#include <config.h>
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#include <stdlib.h>
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#include <signal.h>
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/* This is exactly like the traditional signal function, but turns on the
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SA_RESTART bit where possible. */
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sighandler_t
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setsig (int sig, sighandler_t handler)
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{
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#ifdef HAVE_SIGACTION
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struct sigaction sa, osa;
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sigemptyset (&sa.sa_mask);
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sigemptyset (&osa.sa_mask);
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# ifdef SA_RESTART
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sa.sa_flags |= SA_RESTART;
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# endif
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sa.sa_handler = handler;
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if (sigaction (sig, &sa, &osa) < 0)
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return SIG_ERR;
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return osa.sa_handler;
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#else /* !HAVE_SIGACTION */
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# ifdef HAVE_SIGVEC
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struct sigvec sv, osv;
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sigemptyset (&sv.sv_mask);
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sigemptyset (&osv.sv_mask);
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sv.sv_handler = handler;
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if (sigvec (sig, &sv, &osv) < 0)
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return SIG_ERR;
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return osv.sv_handler;
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# else /* !HAVE_SIGVEC */
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return signal (sig, handler);
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# endif /* HAVE_SIGVEC */
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#endif /* HAVE_SIGACTION */
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}
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