1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Replacing signal mask with *sigmask and suspending calling process |
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5 | * @ingroup POSIXAPI |
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6 | */ |
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7 | |
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8 | /* |
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9 | * 3.3.7 Wait for a Signal, P1003.1b-1993, p. 75 |
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10 | * |
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11 | * COPYRIGHT (c) 1989-2004. |
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12 | * On-Line Applications Research Corporation (OAR). |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.com/license/LICENSE. |
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17 | */ |
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18 | |
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19 | #if HAVE_CONFIG_H |
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20 | #include "config.h" |
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21 | #endif |
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22 | |
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23 | #include <stddef.h> |
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24 | #include <assert.h> |
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25 | #include <signal.h> |
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26 | #include <errno.h> |
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27 | |
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28 | #include <rtems/seterr.h> |
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29 | |
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30 | int sigsuspend( |
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31 | const sigset_t *sigmask |
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32 | ) |
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33 | { |
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34 | sigset_t saved_signals_blocked; |
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35 | sigset_t current_unblocked_signals; |
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36 | #if defined(RTEMS_DEBUG) |
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37 | int status; |
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38 | #endif |
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39 | |
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40 | /* |
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41 | * We use SIG_BLOCK and not SIG_SETMASK because there may be |
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42 | * signals which might be pending, which might get caught here. |
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43 | * We want the signals to be caught inside sigtimedwait. |
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44 | * |
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45 | * We ignore the return status codes because sigsuspend() is |
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46 | * defined to either terminate or return -1 with errno set to |
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47 | * EINTR. |
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48 | */ |
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49 | #if defined(RTEMS_DEBUG) |
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50 | status = |
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51 | #else |
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52 | (void) |
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53 | #endif |
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54 | sigprocmask( SIG_BLOCK, sigmask, &saved_signals_blocked ); |
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55 | |
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56 | current_unblocked_signals = ~(*sigmask); |
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57 | |
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58 | #if defined(RTEMS_DEBUG) |
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59 | status = |
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60 | #else |
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61 | (void) |
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62 | #endif |
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63 | sigtimedwait( ¤t_unblocked_signals, NULL, NULL ); |
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64 | |
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65 | (void) sigprocmask( SIG_SETMASK, &saved_signals_blocked, NULL ); |
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66 | |
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67 | /* |
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68 | * sigtimedwait() returns the signal number while sigsuspend() |
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69 | * is supposed to return -1 and EINTR when a signal is caught. |
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70 | */ |
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71 | #if defined(RTEMS_DEBUG) |
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72 | assert( status != -1 ); |
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73 | #endif |
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74 | |
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75 | rtems_set_errno_and_return_minus_one( EINTR ); |
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76 | } |
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