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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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48
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31 ngx_int_t ngx_os_init(ngx_log_t *log)
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0
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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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58
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100 ngx_init_setproctitle(log);
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101
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0
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102 ngx_pagesize = getpagesize();
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103
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104 if (ngx_ncpu == 0) {
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105 ngx_ncpu = 1;
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106 }
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107
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108 for (sig = signals; sig->signo != 0; sig++) {
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109 ngx_memzero(&sa, sizeof(struct sigaction));
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110 sa.sa_handler = sig->handler;
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111 sigemptyset(&sa.sa_mask);
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112 if (sigaction(sig->signo, &sa, NULL) == -1) {
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113 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
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114 "sigaction(%s) failed", sig->signame);
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115 return NGX_ERROR;
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116 }
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117 }
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118
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119 if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) {
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120 ngx_log_error(NGX_LOG_ALERT, log, errno,
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121 "getrlimit(RLIMIT_NOFILE) failed)");
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122 return NGX_ERROR;
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123 }
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124
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125 ngx_max_sockets = rlmt.rlim_cur;
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126
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18
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127 #if (NGX_HAVE_INHERITED_NONBLOCK)
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0
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128 ngx_inherited_nonblocking = 1;
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129 #else
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130 ngx_inherited_nonblocking = 0;
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131 #endif
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132
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133 return NGX_OK;
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134 }
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135
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136
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137 void ngx_posix_status(ngx_log_t *log)
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138 {
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80
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139 ngx_log_error(NGX_LOG_NOTICE, log, 0,
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10
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140 "getrlimit(RLIMIT_NOFILE): %r:%r",
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0
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141 rlmt.rlim_cur, rlmt.rlim_max);
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142 }
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143
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144
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145 void ngx_signal_handler(int signo)
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146 {
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147 char *action;
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148 struct timeval tv;
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149 ngx_int_t ignore;
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150 ngx_err_t err;
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151 ngx_signal_t *sig;
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152
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153 ignore = 0;
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154
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155 err = ngx_errno;
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156
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157 for (sig = signals; sig->signo != 0; sig++) {
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158 if (sig->signo == signo) {
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159 break;
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160 }
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161 }
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162
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163 ngx_gettimeofday(&tv);
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164 ngx_time_update(tv.tv_sec);
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165
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166 action = "";
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167
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168 switch (ngx_process) {
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169
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170 case NGX_PROCESS_MASTER:
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171 case NGX_PROCESS_SINGLE:
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172 switch (signo) {
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173
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174 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
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175 ngx_quit = 1;
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176 action = ", shutting down";
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177 break;
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178
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179 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
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180 case SIGINT:
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181 ngx_terminate = 1;
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182 action = ", exiting";
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183 break;
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184
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185 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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186 ngx_noaccept = 1;
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50
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187 action = ", stop accepting connections";
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0
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188 break;
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189
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190 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
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191 ngx_reconfigure = 1;
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192 action = ", reconfiguring";
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193 break;
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194
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195 case ngx_signal_value(NGX_REOPEN_SIGNAL):
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196 ngx_reopen = 1;
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197 action = ", reopening logs";
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0
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198 break;
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199
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200 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
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201 if (getppid() > 1 || ngx_new_binary > 0) {
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202
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203 /*
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204 * Ignore the signal in the new binary if its parent is
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205 * not the init process, i.e. the old binary's process
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206 * is still running. Or ingore the signal in the old binary's
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207 * process if the new binary's process is already running.
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208 */
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209
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210 action = ", ignoring";
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211 ignore = 1;
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212 break;
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213 }
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214
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215 ngx_change_binary = 1;
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216 action = ", changing binary";
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217 break;
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218
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219 case SIGALRM:
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220 if (!ngx_terminate) {
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221 ngx_timer = 1;
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222 action = ", shutting down old worker processes";
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223 }
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224
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225 break;
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226
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227 case SIGIO:
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228 ngx_sigio = 1;
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229 break;
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230
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231 case SIGCHLD:
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232 ngx_reap = 1;
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233 break;
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234 }
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235
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236 break;
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237
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238 case NGX_PROCESS_WORKER:
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239 switch (signo) {
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240
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26
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241 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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242 ngx_debug_quit = 1;
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0
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243 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
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244 ngx_quit = 1;
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245 action = ", shutting down";
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246 break;
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247
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248 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
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249 case SIGINT:
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250 ngx_terminate = 1;
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251 action = ", exiting";
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252 break;
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253
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254 case ngx_signal_value(NGX_REOPEN_SIGNAL):
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255 ngx_reopen = 1;
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256 action = ", reopening logs";
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0
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257 break;
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258
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259 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
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260 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
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261 case SIGIO:
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262 action = ", ignoring";
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263 break;
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264 }
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265
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266 break;
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267 }
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268
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26
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269 ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
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0
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270 "signal %d (%s) received%s", signo, sig->signame, action);
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271
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272 if (ignore) {
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273 ngx_log_error(NGX_LOG_CRIT, ngx_cycle->log, 0,
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274 "the changing binary signal is ignored: "
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275 "you should shutdown or terminate "
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276 "before either old or new binary's process");
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277 }
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278
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279 if (signo == SIGCHLD) {
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280 ngx_process_get_status();
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281 }
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282
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283 ngx_set_errno(err);
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284 }
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285
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286
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48
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287 ngx_int_t ngx_posix_post_conf_init(ngx_log_t *log)
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0
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288 {
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289 ngx_fd_t pp[2];
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290
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291 if (pipe(pp) == -1) {
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292 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "pipe() failed");
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293 return NGX_ERROR;
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294 }
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295
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296 if (dup2(pp[1], STDERR_FILENO) == -1) {
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297 ngx_log_error(NGX_LOG_EMERG, log, errno, "dup2(STDERR) failed");
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298 return NGX_ERROR;
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299 }
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300
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301 if (pp[1] > STDERR_FILENO) {
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302 if (close(pp[1]) == -1) {
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303 ngx_log_error(NGX_LOG_EMERG, log, errno, "close() failed");
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304 return NGX_ERROR;
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305 }
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306 }
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307
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308 return NGX_OK;
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309 }
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