1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Create a Per-Process Timer |
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5 | * @ingroup POSIX_PRIV_TIMERS Timers |
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6 | */ |
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7 | |
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8 | /* |
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9 | * 14.2.2 Create a Per-Process Timer, P1003.1b-1993, p. 264 |
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10 | * |
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11 | * COPYRIGHT (c) 1989-2007. |
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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.org/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 <time.h> |
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24 | #include <errno.h> |
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25 | #include <signal.h> |
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26 | |
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27 | #include <rtems/system.h> |
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28 | #include <rtems/seterr.h> |
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29 | #include <rtems/score/thread.h> |
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30 | #include <rtems/posix/sigset.h> |
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31 | #include <rtems/posix/timerimpl.h> |
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32 | #include <rtems/score/watchdogimpl.h> |
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33 | |
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34 | int timer_create( |
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35 | clockid_t clock_id, |
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36 | struct sigevent *__restrict evp, |
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37 | timer_t *__restrict timerid |
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38 | ) |
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39 | { |
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40 | POSIX_Timer_Control *ptimer; |
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41 | |
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42 | if ( clock_id != CLOCK_REALTIME ) |
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43 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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44 | |
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45 | if ( !timerid ) |
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46 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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47 | |
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48 | /* |
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49 | * The data of the structure evp are checked in order to verify if they |
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50 | * are coherent. |
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51 | */ |
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52 | |
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53 | if (evp != NULL) { |
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54 | /* The structure has data */ |
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55 | if ( ( evp->sigev_notify != SIGEV_NONE ) && |
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56 | ( evp->sigev_notify != SIGEV_SIGNAL ) ) { |
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57 | /* The value of the field sigev_notify is not valid */ |
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58 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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59 | } |
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60 | |
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61 | if ( !evp->sigev_signo ) |
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62 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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63 | |
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64 | if ( !is_valid_signo(evp->sigev_signo) ) |
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65 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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66 | } |
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67 | |
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68 | /* |
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69 | * Allocate a timer |
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70 | */ |
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71 | ptimer = _POSIX_Timer_Allocate(); |
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72 | if ( !ptimer ) { |
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73 | _Objects_Allocator_unlock(); |
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74 | rtems_set_errno_and_return_minus_one( EAGAIN ); |
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75 | } |
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76 | |
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77 | /* The data of the created timer are stored to use them later */ |
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78 | |
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79 | ptimer->state = POSIX_TIMER_STATE_CREATE_NEW; |
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80 | ptimer->thread_id = _Thread_Get_executing()->Object.id; |
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81 | |
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82 | if ( evp != NULL ) { |
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83 | ptimer->inf.sigev_notify = evp->sigev_notify; |
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84 | ptimer->inf.sigev_signo = evp->sigev_signo; |
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85 | ptimer->inf.sigev_value = evp->sigev_value; |
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86 | } |
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87 | |
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88 | ptimer->overrun = 0; |
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89 | ptimer->timer_data.it_value.tv_sec = 0; |
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90 | ptimer->timer_data.it_value.tv_nsec = 0; |
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91 | ptimer->timer_data.it_interval.tv_sec = 0; |
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92 | ptimer->timer_data.it_interval.tv_nsec = 0; |
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93 | |
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94 | _Watchdog_Preinitialize( &ptimer->Timer ); |
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95 | _Objects_Open_u32(&_POSIX_Timer_Information, &ptimer->Object, 0); |
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96 | |
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97 | *timerid = ptimer->Object.id; |
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98 | _Objects_Allocator_unlock(); |
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99 | return 0; |
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100 | } |
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