1 | /* |
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2 | * 3.3.4 Examine and Change Signal Action, P1003.1b-1993, p. 70 |
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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.rtems.com/license/LICENSE. |
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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 | #if HAVE_CONFIG_H |
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15 | #include "config.h" |
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16 | #endif |
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17 | |
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18 | #include <pthread.h> |
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19 | #include <signal.h> |
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20 | #include <errno.h> |
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21 | |
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22 | #include <rtems/system.h> |
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23 | #include <rtems/posix/pthread.h> |
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24 | #include <rtems/posix/psignal.h> |
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25 | #include <rtems/seterr.h> |
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26 | #include <rtems/score/isr.h> |
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27 | |
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28 | /* |
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29 | * PARAMETERS_PASSING_S is defined in ptimer.c |
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30 | */ |
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31 | |
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32 | extern void PARAMETERS_PASSING_S (int num_signal, const struct sigaction inf); |
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33 | |
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34 | int sigaction( |
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35 | int sig, |
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36 | const struct sigaction *act, |
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37 | struct sigaction *oact |
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38 | ) |
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39 | { |
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40 | ISR_Level level; |
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41 | |
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42 | if ( oact ) |
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43 | *oact = _POSIX_signals_Vectors[ sig ]; |
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44 | |
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45 | if ( !sig ) |
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46 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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47 | |
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48 | if ( !is_valid_signo(sig) ) |
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49 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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50 | |
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51 | /* |
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52 | * Some signals cannot be ignored (P1003.1b-1993, pp. 70-72 and references. |
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53 | * |
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54 | * NOTE: Solaris documentation claims to "silently enforce" this which |
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55 | * contradicts the POSIX specification. |
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56 | */ |
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57 | |
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58 | if ( sig == SIGKILL ) |
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59 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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60 | |
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61 | /* |
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62 | * Evaluate the new action structure and set the global signal vector |
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63 | * appropriately. |
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64 | */ |
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65 | |
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66 | if ( act ) { |
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67 | |
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68 | /* |
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69 | * Unless the user is installing the default signal actions, then |
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70 | * we can just copy the provided sigaction structure into the vectors. |
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71 | */ |
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72 | |
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73 | _ISR_Disable( level ); |
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74 | if ( act->sa_handler == SIG_DFL ) { |
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75 | _POSIX_signals_Vectors[ sig ] = _POSIX_signals_Default_vectors[ sig ]; |
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76 | } else { |
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77 | _POSIX_signals_Clear_process_signals( sig ); |
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78 | _POSIX_signals_Vectors[ sig ] = *act; |
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79 | } |
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80 | _ISR_Enable( level ); |
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81 | } |
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82 | |
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83 | /* |
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84 | * No need to evaluate or dispatch because: |
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85 | * |
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86 | * + If we were ignoring the signal before, none could be pending |
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87 | * now (signals not posted when SIG_IGN). |
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88 | * + If we are now ignoring a signal that was previously pending, |
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89 | * we clear the pending signal indicator. |
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90 | */ |
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91 | |
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92 | return 0; |
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93 | } |
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