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