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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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9 #include <ngx_event.h>
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10 #include <ngx_channel.h>
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11
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12
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13 static void ngx_execute_proc(ngx_cycle_t *cycle, void *data);
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14
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2
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15
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16 int ngx_argc;
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17 char **ngx_argv;
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18 char **ngx_os_argv;
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19
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20 ngx_int_t ngx_process_slot;
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21 ngx_socket_t ngx_channel;
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22 ngx_int_t ngx_last_process;
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23 ngx_process_t ngx_processes[NGX_MAX_PROCESSES];
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0
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24
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25
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26 ngx_pid_t ngx_spawn_process(ngx_cycle_t *cycle,
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27 ngx_spawn_proc_pt proc, void *data,
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28 char *name, ngx_int_t respawn)
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29 {
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30 u_long on;
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31 ngx_pid_t pid;
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32 ngx_int_t s;
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33
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34 if (respawn >= 0) {
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35 s = respawn;
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36
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37 } else {
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38 for (s = 0; s < ngx_last_process; s++) {
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39 if (ngx_processes[s].pid == -1) {
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40 break;
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41 }
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42 }
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43
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44 if (s == NGX_MAX_PROCESSES) {
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45 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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46 "no more than %d processes can be spawned",
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47 NGX_MAX_PROCESSES);
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48 return NGX_ERROR;
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49 }
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50 }
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51
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52
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53 if (respawn != NGX_PROCESS_DETACHED) {
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54
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55 /* Solaris 9 still has no AF_LOCAL */
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56
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57 if (socketpair(AF_UNIX, SOCK_STREAM, 0, ngx_processes[s].channel) == -1)
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58 {
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59 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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60 "socketpair() failed while spawning \"%s\"", name);
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61 return NGX_ERROR;
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62 }
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63
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64 ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
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65 "channel %d:%d",
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66 ngx_processes[s].channel[0],
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67 ngx_processes[s].channel[1]);
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68
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69 if (ngx_nonblocking(ngx_processes[s].channel[0]) == -1) {
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70 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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71 ngx_nonblocking_n " failed while spawning \"%s\"",
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72 name);
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73 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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74 return NGX_ERROR;
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75 }
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76
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77 if (ngx_nonblocking(ngx_processes[s].channel[1]) == -1) {
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78 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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79 ngx_nonblocking_n " failed while spawning \"%s\"",
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80 name);
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81 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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82 return NGX_ERROR;
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83 }
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84
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85 on = 1;
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86 if (ioctl(ngx_processes[s].channel[0], FIOASYNC, &on) == -1) {
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87 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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88 "ioctl(FIOASYNC) failed while spawning \"%s\"", name);
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89 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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90 return NGX_ERROR;
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91 }
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92
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93 if (fcntl(ngx_processes[s].channel[0], F_SETOWN, ngx_pid) == -1) {
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94 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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95 "fcntl(F_SETOWN) failed while spawning \"%s\"", name);
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96 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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97 return NGX_ERROR;
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98 }
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99
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100 if (fcntl(ngx_processes[s].channel[0], F_SETFD, FD_CLOEXEC) == -1) {
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101 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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102 "fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
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103 name);
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104 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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105 return NGX_ERROR;
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106 }
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107
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108 if (fcntl(ngx_processes[s].channel[1], F_SETFD, FD_CLOEXEC) == -1) {
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109 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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110 "fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
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111 name);
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112 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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113 return NGX_ERROR;
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114 }
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115
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116 ngx_channel = ngx_processes[s].channel[1];
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117
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118 } else {
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119 ngx_processes[s].channel[0] = -1;
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120 ngx_processes[s].channel[1] = -1;
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121 }
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122
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123 ngx_process_slot = s;
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124
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125
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126 pid = fork();
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127
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128 switch (pid) {
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129
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130 case -1:
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131 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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132 "fork() failed while spawning \"%s\"", name);
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133 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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134 return NGX_ERROR;
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135
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136 case 0:
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137 ngx_pid = ngx_getpid();
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138 proc(cycle, data);
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139 break;
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140
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141 default:
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142 break;
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143 }
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144
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26
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145 ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "start %s %P", name, pid);
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0
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146
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147 ngx_processes[s].pid = pid;
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148 ngx_processes[s].exited = 0;
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149
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150 if (respawn >= 0) {
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151 return pid;
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152 }
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153
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154 ngx_processes[s].proc = proc;
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155 ngx_processes[s].data = data;
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156 ngx_processes[s].name = name;
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157 ngx_processes[s].exiting = 0;
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158
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159 switch (respawn) {
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160
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161 case NGX_PROCESS_RESPAWN:
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162 ngx_processes[s].respawn = 1;
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163 ngx_processes[s].just_respawn = 0;
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164 ngx_processes[s].detached = 0;
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165 break;
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166
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167 case NGX_PROCESS_JUST_RESPAWN:
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168 ngx_processes[s].respawn = 1;
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169 ngx_processes[s].just_respawn = 1;
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170 ngx_processes[s].detached = 0;
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171 break;
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172
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173 case NGX_PROCESS_DETACHED:
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174 ngx_processes[s].respawn = 0;
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175 ngx_processes[s].just_respawn = 0;
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176 ngx_processes[s].detached = 1;
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177 break;
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178 }
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179
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180 if (s == ngx_last_process) {
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181 ngx_last_process++;
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182 }
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183
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184 return pid;
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185 }
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186
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187
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188 ngx_pid_t ngx_execute(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx)
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189 {
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190 return ngx_spawn_process(cycle, ngx_execute_proc, ctx, ctx->name,
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191 NGX_PROCESS_DETACHED);
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192 }
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193
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194
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195 static void ngx_execute_proc(ngx_cycle_t *cycle, void *data)
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196 {
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197 ngx_exec_ctx_t *ctx = data;
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198
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199 if (execve(ctx->path, ctx->argv, ctx->envp) == -1) {
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200 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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201 "execve() failed while executing %s \"%s\"",
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202 ctx->name, ctx->path);
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203 }
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204
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205 exit(1);
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206 }
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207
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208
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209 void ngx_process_get_status()
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210 {
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211 int status;
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212 char *process;
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213 ngx_pid_t pid;
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214 ngx_err_t err;
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215 ngx_int_t i;
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216 ngx_uint_t one;
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217 struct timeval tv;
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26
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218
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0
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219 one = 0;
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220
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221 for ( ;; ) {
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222 pid = waitpid(-1, &status, WNOHANG);
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223
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224 if (pid == 0) {
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225 return;
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226 }
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227
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228 if (pid == -1) {
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229 err = ngx_errno;
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230
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231 if (err == NGX_EINTR) {
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232 continue;
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233 }
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234
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235 if (err == NGX_ECHILD && one) {
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236 return;
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237 }
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238
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4
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239 #if (NGX_SOLARIS)
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2
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240
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241 /*
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242 * Solaris always calls the signal handler for each exited process
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243 * despite waitpid() may be already called for this process
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244 */
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245
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246 if (err == NGX_ECHILD) {
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247 ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, errno,
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248 "waitpid() failed");
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249 }
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250
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251 #endif
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252
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0
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253 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, errno,
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254 "waitpid() failed");
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2
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255
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0
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256 return;
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257 }
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258
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259
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260 if (ngx_accept_mutex_ptr) {
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261
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262 /*
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263 * unlock the accept mutex if the abnormally exited process
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264 * held it
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265 */
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266
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267 ngx_atomic_cmp_set(ngx_accept_mutex_ptr, pid, 0);
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268 }
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269
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270
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271 one = 1;
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272 process = "unknown process";
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273
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274 for (i = 0; i < ngx_last_process; i++) {
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275 if (ngx_processes[i].pid == pid) {
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276 ngx_processes[i].status = status;
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277 ngx_processes[i].exited = 1;
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278 process = ngx_processes[i].name;
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279 break;
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280 }
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281 }
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282
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283 if (WTERMSIG(status)) {
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284 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
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10
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285 "%s %P exited on signal %d%s",
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0
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286 process, pid, WTERMSIG(status),
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287 WCOREDUMP(status) ? " (core dumped)" : "");
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288
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289 } else {
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26
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290 ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
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10
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291 "%s %P exited with code %d",
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0
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292 process, pid, WEXITSTATUS(status));
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293 }
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294
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295 if (WEXITSTATUS(status) == 2 && ngx_processes[i].respawn) {
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296 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
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10
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297 "%s %P exited with fatal code %d and could not respawn",
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298 process, pid, WEXITSTATUS(status));
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0
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299 ngx_processes[i].respawn = 0;
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300 }
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301 }
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302 }
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10
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303
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304
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305 void ngx_debug_point()
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306 {
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307 ngx_core_conf_t *ccf;
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308
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309 ccf = (ngx_core_conf_t *) ngx_get_conf(ngx_cycle->conf_ctx,
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310 ngx_core_module);
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311
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312 switch (ccf->debug_points) {
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313
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314 case NGX_DEBUG_POINTS_STOP:
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315 raise(SIGSTOP);
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316 break;
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317
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318 case NGX_DEBUG_POINTS_ABORT:
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319 abort();
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320 }
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321 }
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