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