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