scoutos / prex-0.9.0 / usr / lib / posix / signal / sigaction.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2005, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #include <sys/signal.h> |
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31 | |||
32 | #include <stddef.h> |
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33 | #include <signal.h> |
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34 | #include <errno.h> |
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35 | |||
36 | /*
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37 | * If act is not NULL, set the action for signum.
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38 | * If oact is not NULL. store the old action to oact.
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39 | */
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40 | int
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41 | sigaction(int signum, const struct sigaction *act, struct sigaction *oact) |
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42 | { |
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43 | struct sigaction *sa;
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44 | |||
45 | if (signum <= 0 || signum >= NSIG || |
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46 | signum == SIGSTOP || signum == SIGKILL) { |
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47 | errno = EINVAL; |
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48 | return -1; |
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49 | } |
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50 | |||
51 | SIGNAL_LOCK(); |
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52 | |||
53 | sa = &__sig_act[signum]; |
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54 | |||
55 | if (oact != NULL) |
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56 | *oact = *sa; |
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57 | |||
58 | if (act != NULL) |
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59 | *sa = *act; |
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60 | |||
61 | /* Discard pending signal in some cases */
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62 | if (sa->sa_handler == SIG_IGN ||
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63 | (sa->sa_handler == SIG_DFL && signum == SIGCHLD)) |
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64 | __sig_pending &= ~sigmask(signum); |
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65 | |||
66 | SIGNAL_UNLOCK(); |
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67 | |||
68 | /* Process pending signal */
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69 | __sig_flush(); |
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70 | |||
71 | return 0; |
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72 | } |