0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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58
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9 #include <ngx_setproctitle.h>
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0
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10
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11
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22
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12 ngx_int_t ngx_ncpu;
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13 ngx_int_t ngx_max_sockets;
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14 ngx_uint_t ngx_inherited_nonblocking;
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15 ngx_uint_t ngx_tcp_nodelay_and_tcp_nopush;
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0
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16
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17
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18 struct rlimit rlmt;
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19
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20
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21 #if (NGX_POSIX_IO)
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22
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23 ngx_os_io_t ngx_os_io = {
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24 ngx_unix_recv,
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25 ngx_readv_chain,
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26 NULL,
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27 ngx_writev_chain,
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28 0
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29 };
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30
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31
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48
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32 ngx_int_t ngx_os_init(ngx_log_t *log)
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0
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33 {
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34 return ngx_posix_init(log);
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35 }
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36
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37
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4
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38 void ngx_os_status(ngx_log_t *log)
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39 {
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40 ngx_posix_status(log);
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41 }
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42
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43
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0
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44 #endif
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45
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46
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47 void ngx_signal_handler(int signo);
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48
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49
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50 typedef struct {
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51 int signo;
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52 char *signame;
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53 void (*handler)(int signo);
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54 } ngx_signal_t;
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55
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56
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57 ngx_signal_t signals[] = {
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58 { ngx_signal_value(NGX_RECONFIGURE_SIGNAL),
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59 "SIG" ngx_value(NGX_RECONFIGURE_SIGNAL),
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60 ngx_signal_handler },
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61
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62 { ngx_signal_value(NGX_REOPEN_SIGNAL),
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63 "SIG" ngx_value(NGX_REOPEN_SIGNAL),
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64 ngx_signal_handler },
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65
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66 { ngx_signal_value(NGX_NOACCEPT_SIGNAL),
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67 "SIG" ngx_value(NGX_NOACCEPT_SIGNAL),
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68 ngx_signal_handler },
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69
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70 { ngx_signal_value(NGX_TERMINATE_SIGNAL),
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71 "SIG" ngx_value(NGX_TERMINATE_SIGNAL),
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72 ngx_signal_handler },
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73
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74 { ngx_signal_value(NGX_SHUTDOWN_SIGNAL),
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75 "SIG" ngx_value(NGX_SHUTDOWN_SIGNAL),
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76 ngx_signal_handler },
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77
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78 { ngx_signal_value(NGX_CHANGEBIN_SIGNAL),
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79 "SIG" ngx_value(NGX_CHANGEBIN_SIGNAL),
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80 ngx_signal_handler },
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81
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82 { SIGALRM, "SIGALRM", ngx_signal_handler },
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83
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84 { SIGINT, "SIGINT", ngx_signal_handler },
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85
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86 { SIGIO, "SIGIO", ngx_signal_handler },
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87
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88 { SIGCHLD, "SIGCHLD", ngx_signal_handler },
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89
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90 { SIGPIPE, "SIGPIPE, SIG_IGN", SIG_IGN },
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91
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92 { 0, NULL, NULL }
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93 };
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94
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95
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96 ngx_int_t ngx_posix_init(ngx_log_t *log)
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97 {
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98 ngx_signal_t *sig;
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99 struct sigaction sa;
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100
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101 ngx_init_setproctitle(log);
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102
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0
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103 ngx_pagesize = getpagesize();
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104
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105 if (ngx_ncpu == 0) {
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106 ngx_ncpu = 1;
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107 }
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108
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109 for (sig = signals; sig->signo != 0; sig++) {
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110 ngx_memzero(&sa, sizeof(struct sigaction));
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111 sa.sa_handler = sig->handler;
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112 sigemptyset(&sa.sa_mask);
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113 if (sigaction(sig->signo, &sa, NULL) == -1) {
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114 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
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115 "sigaction(%s) failed", sig->signame);
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116 return NGX_ERROR;
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117 }
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118 }
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119
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120 if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) {
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121 ngx_log_error(NGX_LOG_ALERT, log, errno,
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122 "getrlimit(RLIMIT_NOFILE) failed)");
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123 return NGX_ERROR;
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124 }
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125
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126 ngx_max_sockets = rlmt.rlim_cur;
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127
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128 #if (NGX_HAVE_INHERITED_NONBLOCK)
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129 ngx_inherited_nonblocking = 1;
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130 #else
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131 ngx_inherited_nonblocking = 0;
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132 #endif
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133
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134 return NGX_OK;
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135 }
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136
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137
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138 void ngx_posix_status(ngx_log_t *log)
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139 {
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140 ngx_log_error(NGX_LOG_INFO, log, 0,
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10
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141 "getrlimit(RLIMIT_NOFILE): %r:%r",
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0
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142 rlmt.rlim_cur, rlmt.rlim_max);
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143 }
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144
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145
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146 void ngx_signal_handler(int signo)
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147 {
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148 char *action;
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149 struct timeval tv;
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150 ngx_int_t ignore;
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151 ngx_err_t err;
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152 ngx_signal_t *sig;
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153
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154 ignore = 0;
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155
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156 err = ngx_errno;
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157
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158 for (sig = signals; sig->signo != 0; sig++) {
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159 if (sig->signo == signo) {
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160 break;
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161 }
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162 }
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163
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164 ngx_gettimeofday(&tv);
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165 ngx_time_update(tv.tv_sec);
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166
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167 action = "";
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168
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169 switch (ngx_process) {
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170
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171 case NGX_PROCESS_MASTER:
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172 case NGX_PROCESS_SINGLE:
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173 switch (signo) {
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174
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175 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
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176 ngx_quit = 1;
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177 action = ", shutting down";
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178 break;
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179
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180 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
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181 case SIGINT:
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182 ngx_terminate = 1;
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183 action = ", exiting";
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184 break;
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185
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186 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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187 ngx_noaccept = 1;
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188 action = ", stop accepting connections";
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189 break;
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190
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191 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
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192 ngx_reconfigure = 1;
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193 action = ", reconfiguring";
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194 break;
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195
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196 case ngx_signal_value(NGX_REOPEN_SIGNAL):
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197 ngx_reopen = 1;
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198 action = ", reopening logs";
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199 break;
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200
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201 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
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202 if (getppid() > 1 || ngx_new_binary > 0) {
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203
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204 /*
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205 * Ignore the signal in the new binary if its parent is
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206 * not the init process, i.e. the old binary's process
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207 * is still running. Or ingore the signal in the old binary's
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208 * process if the new binary's process is already running.
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209 */
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210
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211 action = ", ignoring";
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212 ignore = 1;
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213 break;
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214 }
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215
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216 ngx_change_binary = 1;
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217 action = ", changing binary";
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218 break;
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219
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220 case SIGALRM:
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221 if (!ngx_terminate) {
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222 ngx_timer = 1;
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223 action = ", shutting down old worker processes";
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224 }
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225
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226 break;
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227
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228 case SIGIO:
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229 ngx_sigio = 1;
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230 break;
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231
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232 case SIGCHLD:
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233 ngx_reap = 1;
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234 break;
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235 }
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236
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237 break;
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238
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239 case NGX_PROCESS_WORKER:
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240 switch (signo) {
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241
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26
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242 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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243 ngx_debug_quit = 1;
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244 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
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245 ngx_quit = 1;
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246 action = ", shutting down";
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247 break;
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248
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249 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
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250 case SIGINT:
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251 ngx_terminate = 1;
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252 action = ", exiting";
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253 break;
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254
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255 case ngx_signal_value(NGX_REOPEN_SIGNAL):
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256 ngx_reopen = 1;
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257 action = ", reopening logs";
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258 break;
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259
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260 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
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261 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
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262 case SIGIO:
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263 action = ", ignoring";
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264 break;
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265 }
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266
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267 break;
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268 }
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269
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26
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270 ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
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271 "signal %d (%s) received%s", signo, sig->signame, action);
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272
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273 if (ignore) {
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274 ngx_log_error(NGX_LOG_CRIT, ngx_cycle->log, 0,
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275 "the changing binary signal is ignored: "
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276 "you should shutdown or terminate "
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277 "before either old or new binary's process");
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278 }
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279
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280 if (signo == SIGCHLD) {
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281 ngx_process_get_status();
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282 }
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283
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284 ngx_set_errno(err);
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285 }
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286
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287
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288 ngx_int_t ngx_posix_post_conf_init(ngx_log_t *log)
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0
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289 {
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290 ngx_fd_t pp[2];
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291
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292 if (pipe(pp) == -1) {
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293 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "pipe() failed");
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294 return NGX_ERROR;
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295 }
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296
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297 if (dup2(pp[1], STDERR_FILENO) == -1) {
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298 ngx_log_error(NGX_LOG_EMERG, log, errno, "dup2(STDERR) failed");
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299 return NGX_ERROR;
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300 }
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301
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302 if (pp[1] > STDERR_FILENO) {
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303 if (close(pp[1]) == -1) {
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304 ngx_log_error(NGX_LOG_EMERG, log, errno, "close() failed");
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305 return NGX_ERROR;
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306 }
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307 }
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308
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309 return NGX_OK;
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310 }
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