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/*
* ircsig.c: has a `my_signal()' that uses sigaction().
*
* Copyright (c) 1993-2016 Matthew R. Green.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* written by matthew green, 1993.
*
* i stole bits of this from w. richard stevens' `advanced programming
* in the unix environment' -mrg
*/
#include "irc.h"
IRCII_RCSID("@(#)$eterna: ircsig.c,v 1.20 2016/12/04 21:40:49 gkm Exp $");
sigfunc *
my_signal(int sig_no, sigfunc *sig_handler, int misc_flags)
{
/*
* misc_flags is unused currently. it's planned to be used
* to use some of the doovier bits of sigaction(), if at
* some point we need them, -mrg
*/
struct sigaction sa, osa;
/*
* have to (void *) this because of strict type checking
* on some systems -glen
*/
sa.sa_handler = (void (*)(int)) sig_handler;
sigemptyset(&sa.sa_mask);
sigaddset(&sa.sa_mask, sig_no);
/* this is ugly, but the `correct' way. i hate c. -mrg */
sa.sa_flags = 0;
#if defined(SA_RESTART) || defined(SA_INTERRUPT)
if (SIGALRM == sig_no)
{
# if defined(SA_INTERRUPT)
sa.sa_flags |= SA_INTERRUPT;
# endif /* SA_INTERRUPT */
}
else
{
# if defined(SA_RESTART)
sa.sa_flags |= SA_RESTART;
# endif /* SA_RESTART */
}
#endif /* SA_RESTART || SA_INTERRUPT */
if (0 > sigaction(sig_no, &sa, &osa))
return ((sigfunc *)SIG_ERR);
return ((sigfunc *)osa.sa_handler);
}
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