1 |
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2 #include "signals.h" |
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3 #include "log.h" |
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4 |
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5 #define _GNU_SOURCE |
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6 |
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7 #include <string.h> |
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8 #include <signal.h> |
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9 #include <stdlib.h> |
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10 #include <assert.h> |
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11 |
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12 struct signals { |
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13 /** The libevent base to use */ |
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14 struct event_base *ev_base; |
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15 |
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16 /** Information about up to MAX_SIGNALS signals */ |
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17 struct signal { |
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18 /** The event we use to handle the signal */ |
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19 struct event *ev; |
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20 |
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21 } sig_list[MAX_SIGNALS]; |
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22 |
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23 /** Number of used sig_list slots */ |
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24 int sig_count; |
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25 }; |
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26 |
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27 void signals_loopexit (int signal, short event, void *arg) |
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28 { |
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29 struct signals *signals = arg; |
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30 |
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31 (void) event; |
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32 |
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33 log_info("caught %s: exiting", /* strsignal(signal) */ "xxx"); |
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34 |
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35 if (event_base_loopexit(signals->ev_base, NULL)) |
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36 FATAL("event_base_loopexit"); |
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37 } |
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38 |
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39 void signals_ignore (int signal, short event, void *arg) |
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40 { |
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41 struct signals *signals = arg; |
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42 |
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43 (void) signal; |
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44 (void) event; |
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45 (void) arg; |
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46 (void) signals; |
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47 |
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48 /* ignore */ |
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49 } |
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50 |
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51 err_t signals_create (struct signals **signals_ptr, struct event_base *ev_base) |
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52 { |
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53 struct signals *signals; |
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54 |
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55 if ((signals = calloc(1, sizeof(*signals))) == NULL) |
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56 return ERR_CALLOC; |
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57 |
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58 // simple attributes |
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59 signals->ev_base = ev_base; |
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60 |
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61 // done |
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62 *signals_ptr = signals; |
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63 |
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64 return SUCCESS; |
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65 } |
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66 |
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67 err_t signals_add (struct signals *signals, int sigval, void (*sig_handler)(evutil_socket_t, short, void *), void *arg) |
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68 { |
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69 struct signal *sig_info; |
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70 |
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71 // find our sig_info |
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72 assert(signals->sig_count < MAX_SIGNALS); |
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73 sig_info = signals->sig_list + (signals->sig_count++); |
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74 |
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75 // set up the libevent signal events |
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76 if ((sig_info->ev = evsignal_new(signals->ev_base, sigval, sig_handler, arg)) == NULL) |
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77 return ERR_EVENT_NEW; |
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78 |
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79 if (evsignal_add(sig_info->ev, NULL)) |
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80 return ERR_EVENT_ADD; |
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81 |
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82 // ok |
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83 return SUCCESS; |
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84 } |
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85 |
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86 err_t signal_ignore (int signum, struct error_info *err) |
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87 { |
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88 struct sigaction act = { |
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89 .sa_handler = SIG_IGN, |
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90 }; |
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91 |
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92 // signall the handler |
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93 if (sigaction(signum, &act, NULL)) |
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94 RETURN_SET_ERROR_ERRNO(err, ERR_SIGACTION); |
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95 |
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96 // ok |
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97 return SUCCESS; |
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98 } |
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99 |
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100 struct signals *signals_default (struct event_base *ev_base) |
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101 { |
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102 struct signals *signals = NULL; |
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103 struct error_info err; |
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104 |
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105 // alloc signals |
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106 if (signals_create(&signals, ev_base)) |
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107 return NULL; |
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108 |
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109 // add the set of default signals |
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110 if (signal_ignore(SIGPIPE, &err)) |
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111 log_error(&err, "signal_ignore(SIGPIPE)"); |
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112 |
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113 if ((ERROR_CODE(&err) = signals_add(signals, SIGINT, &signals_loopexit, signals))) { |
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114 log_error(&err, "signals_add(SIGINT)"); |
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115 goto error; |
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116 } |
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117 |
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118 // ok |
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119 return signals; |
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120 |
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121 error: |
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122 signals_free(signals); |
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123 |
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124 return NULL; |
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125 } |
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126 |
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127 void signals_free (struct signals *signals) |
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128 { |
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129 int i; |
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130 |
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131 // free all events |
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132 for (i = 0; i < signals->sig_count; i++) { |
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133 event_free(signals->sig_list[i].ev); |
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134 } |
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135 |
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136 // free the info itself |
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137 free(signals); |
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138 } |
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139 |
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