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1 /*
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2 * Copyright (c) 2004 Gunnar Ritter
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3 *
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4 * This software is provided 'as-is', without any express or implied
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5 * warranty. In no event will the authors be held liable for any damages
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6 * arising from the use of this software.
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7 *
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8 * Permission is granted to anyone to use this software for any purpose,
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9 * including commercial applications, and to alter it and redistribute
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10 * it freely, subject to the following restrictions:
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11 *
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12 * 1. The origin of this software must not be misrepresented; you must not
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13 * claim that you wrote the original software. If you use this software
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14 * in a product, an acknowledgment in the product documentation would be
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15 * appreciated but is not required.
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16 *
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17 * 2. Altered source versions must be plainly marked as such, and must not be
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18 * misrepresented as being the original software.
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19 *
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20 * 3. This notice may not be removed or altered from any source distribution.
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21 */
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22 /* Sccsid @(#)sigset.c 1.7 (gritter) 1/22/06 */
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23
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24 #if defined (__FreeBSD__) || defined (__dietlibc__) || defined (__NetBSD__) || \
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25 defined (__OpenBSD__) || defined (__DragonFly__) || defined (__APPLE__)
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26 #include <signal.h>
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27 #include "sigset.h"
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28
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29 void (*sigset(int sig, void (*func)(int)))(int)
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30 {
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31 struct sigaction nact, oact;
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32 sigset_t nset, oset;
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33
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34 if (sig <= 0)
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35 return SIG_ERR;
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36 sigemptyset(&nset);
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37 sigaddset(&nset, sig);
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38 if (sigprocmask(func==SIG_HOLD?SIG_BLOCK:SIG_UNBLOCK, &nset, &oset) < 0)
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39 return SIG_ERR;
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40 nact.sa_handler = func;
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41 nact.sa_flags = 0;
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42 if (sig == SIGCHLD && func == SIG_IGN)
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43 nact.sa_flags |= SA_NOCLDSTOP|SA_NOCLDWAIT;
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44 sigemptyset(&nact.sa_mask);
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45 sigaddset(&nact.sa_mask, sig);
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46 if (sigaction(sig, func==SIG_HOLD?(struct sigaction *)0:&nact, &oact)
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47 == -1)
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48 return SIG_ERR;
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49 if (sigismember(&oset, sig))
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50 return SIG_HOLD;
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51 else
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52 return (oact.sa_handler);
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53 }
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54 #endif /* __FreeBSD__ || __dietlibc__ || __NetBSD__ || __OpenBSD__ ||
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55 __DragonFly__ || __APPLE__ */
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