4.104.114.84.95
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1 | /* |
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2 | * signal(2) - Install signal handler |
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3 | * |
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4 | * COPYRIGHT (c) 1989-1999. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.OARcorp.com/rtems/license.html. |
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10 | * |
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11 | * $Id$ |
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12 | */ |
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13 | |
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14 | |
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15 | #include <signal.h> |
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16 | #include <errno.h> |
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17 | |
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18 | typedef void (*sighandler_t)(int); |
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19 | |
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20 | sighandler_t signal( |
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21 | int signum, |
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22 | sighandler_t handler |
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23 | ) |
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24 | { |
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25 | struct sigaction s; |
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26 | struct sigaction old; |
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27 | |
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28 | s.sa_handler = handler ; |
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29 | sigemptyset(&s.sa_mask); |
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30 | |
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31 | /* |
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32 | * Depending on which system we want to behave like, one of |
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33 | * the following versions should be chosen. |
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34 | */ |
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35 | |
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36 | /* #define signal_like_linux */ |
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37 | |
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38 | #if defined(signal_like_linux) |
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39 | s.sa_flags = SA_RESTART | SA_INTERRUPT | SA_NOMASK; |
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40 | s.sa_restorer= NULL ; |
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41 | #elif defined(signal_like_SVR4) |
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42 | s.sa_flags = SA_RESTART; |
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43 | #else |
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44 | s.sa_flags = 0; |
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45 | #endif |
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46 | |
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47 | sigaction( signum, &s, &old ); |
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48 | return (sighandler_t) old.sa_handler; |
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49 | } |
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