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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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88
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13 typedef struct {
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14 int signo;
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15 char *signame;
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16 void (*handler)(int signo);
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17 } ngx_signal_t;
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18
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19
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20
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0
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21 static void ngx_execute_proc(ngx_cycle_t *cycle, void *data);
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88
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22 static void ngx_signal_handler(int signo);
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23 static void ngx_process_get_status(void);
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0
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24
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2
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25
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26 int ngx_argc;
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27 char **ngx_argv;
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28 char **ngx_os_argv;
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29
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30 ngx_int_t ngx_process_slot;
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31 ngx_socket_t ngx_channel;
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32 ngx_int_t ngx_last_process;
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33 ngx_process_t ngx_processes[NGX_MAX_PROCESSES];
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0
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34
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35
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88
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36 ngx_signal_t signals[] = {
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37 { ngx_signal_value(NGX_RECONFIGURE_SIGNAL),
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38 "SIG" ngx_value(NGX_RECONFIGURE_SIGNAL),
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39 ngx_signal_handler },
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40
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41 { ngx_signal_value(NGX_REOPEN_SIGNAL),
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42 "SIG" ngx_value(NGX_REOPEN_SIGNAL),
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43 ngx_signal_handler },
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44
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45 { ngx_signal_value(NGX_NOACCEPT_SIGNAL),
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46 "SIG" ngx_value(NGX_NOACCEPT_SIGNAL),
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47 ngx_signal_handler },
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48
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49 { ngx_signal_value(NGX_TERMINATE_SIGNAL),
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50 "SIG" ngx_value(NGX_TERMINATE_SIGNAL),
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51 ngx_signal_handler },
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52
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53 { ngx_signal_value(NGX_SHUTDOWN_SIGNAL),
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54 "SIG" ngx_value(NGX_SHUTDOWN_SIGNAL),
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55 ngx_signal_handler },
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56
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57 { ngx_signal_value(NGX_CHANGEBIN_SIGNAL),
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58 "SIG" ngx_value(NGX_CHANGEBIN_SIGNAL),
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59 ngx_signal_handler },
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60
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61 { SIGALRM, "SIGALRM", ngx_signal_handler },
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62
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63 { SIGINT, "SIGINT", ngx_signal_handler },
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64
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65 { SIGIO, "SIGIO", ngx_signal_handler },
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66
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67 { SIGCHLD, "SIGCHLD", ngx_signal_handler },
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68
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69 { SIGPIPE, "SIGPIPE, SIG_IGN", SIG_IGN },
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70
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71 { 0, NULL, NULL }
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72 };
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73
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74
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64
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75 ngx_pid_t
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76 ngx_spawn_process(ngx_cycle_t *cycle, ngx_spawn_proc_pt proc, void *data,
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77 char *name, ngx_int_t respawn)
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0
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78 {
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79 u_long on;
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80 ngx_pid_t pid;
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81 ngx_int_t s;
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82
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83 if (respawn >= 0) {
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84 s = respawn;
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85
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86 } else {
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87 for (s = 0; s < ngx_last_process; s++) {
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88 if (ngx_processes[s].pid == -1) {
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89 break;
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90 }
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91 }
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92
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93 if (s == NGX_MAX_PROCESSES) {
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94 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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95 "no more than %d processes can be spawned",
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96 NGX_MAX_PROCESSES);
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92
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97 return NGX_INVALID_PID;
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0
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98 }
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99 }
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100
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101
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102 if (respawn != NGX_PROCESS_DETACHED) {
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103
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104 /* Solaris 9 still has no AF_LOCAL */
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105
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106 if (socketpair(AF_UNIX, SOCK_STREAM, 0, ngx_processes[s].channel) == -1)
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107 {
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108 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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109 "socketpair() failed while spawning \"%s\"", name);
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92
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110 return NGX_INVALID_PID;
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0
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111 }
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112
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113 ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
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114 "channel %d:%d",
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115 ngx_processes[s].channel[0],
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116 ngx_processes[s].channel[1]);
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117
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118 if (ngx_nonblocking(ngx_processes[s].channel[0]) == -1) {
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119 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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120 ngx_nonblocking_n " failed while spawning \"%s\"",
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121 name);
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122 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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123 return NGX_INVALID_PID;
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0
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124 }
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125
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126 if (ngx_nonblocking(ngx_processes[s].channel[1]) == -1) {
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127 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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128 ngx_nonblocking_n " failed while spawning \"%s\"",
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129 name);
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130 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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131 return NGX_INVALID_PID;
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0
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132 }
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133
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134 on = 1;
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135 if (ioctl(ngx_processes[s].channel[0], FIOASYNC, &on) == -1) {
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136 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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137 "ioctl(FIOASYNC) failed while spawning \"%s\"", name);
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138 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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139 return NGX_INVALID_PID;
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0
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140 }
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141
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142 if (fcntl(ngx_processes[s].channel[0], F_SETOWN, ngx_pid) == -1) {
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143 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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144 "fcntl(F_SETOWN) failed while spawning \"%s\"", name);
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145 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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146 return NGX_INVALID_PID;
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0
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147 }
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148
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149 if (fcntl(ngx_processes[s].channel[0], F_SETFD, FD_CLOEXEC) == -1) {
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150 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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151 "fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
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152 name);
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153 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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154 return NGX_INVALID_PID;
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0
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155 }
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156
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157 if (fcntl(ngx_processes[s].channel[1], F_SETFD, FD_CLOEXEC) == -1) {
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158 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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159 "fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
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160 name);
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161 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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162 return NGX_INVALID_PID;
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0
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163 }
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164
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165 ngx_channel = ngx_processes[s].channel[1];
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166
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167 } else {
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168 ngx_processes[s].channel[0] = -1;
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169 ngx_processes[s].channel[1] = -1;
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170 }
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171
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172 ngx_process_slot = s;
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173
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174
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175 pid = fork();
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176
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177 switch (pid) {
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178
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179 case -1:
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180 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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181 "fork() failed while spawning \"%s\"", name);
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182 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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183 return NGX_INVALID_PID;
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0
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184
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185 case 0:
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186 ngx_pid = ngx_getpid();
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187 proc(cycle, data);
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188 break;
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189
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190 default:
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191 break;
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192 }
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193
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26
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194 ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "start %s %P", name, pid);
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0
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195
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196 ngx_processes[s].pid = pid;
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197 ngx_processes[s].exited = 0;
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198
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199 if (respawn >= 0) {
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200 return pid;
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201 }
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202
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203 ngx_processes[s].proc = proc;
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204 ngx_processes[s].data = data;
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205 ngx_processes[s].name = name;
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206 ngx_processes[s].exiting = 0;
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207
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208 switch (respawn) {
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209
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210 case NGX_PROCESS_RESPAWN:
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211 ngx_processes[s].respawn = 1;
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212 ngx_processes[s].just_respawn = 0;
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213 ngx_processes[s].detached = 0;
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214 break;
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215
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216 case NGX_PROCESS_JUST_RESPAWN:
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217 ngx_processes[s].respawn = 1;
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218 ngx_processes[s].just_respawn = 1;
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219 ngx_processes[s].detached = 0;
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220 break;
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221
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222 case NGX_PROCESS_DETACHED:
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223 ngx_processes[s].respawn = 0;
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224 ngx_processes[s].just_respawn = 0;
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225 ngx_processes[s].detached = 1;
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226 break;
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227 }
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228
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229 if (s == ngx_last_process) {
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230 ngx_last_process++;
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231 }
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232
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233 return pid;
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234 }
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235
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236
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64
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237 ngx_pid_t
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238 ngx_execute(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx)
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0
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239 {
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240 return ngx_spawn_process(cycle, ngx_execute_proc, ctx, ctx->name,
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241 NGX_PROCESS_DETACHED);
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242 }
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243
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244
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64
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245 static void
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246 ngx_execute_proc(ngx_cycle_t *cycle, void *data)
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0
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247 {
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248 ngx_exec_ctx_t *ctx = data;
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249
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250 if (execve(ctx->path, ctx->argv, ctx->envp) == -1) {
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251 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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252 "execve() failed while executing %s \"%s\"",
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253 ctx->name, ctx->path);
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254 }
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255
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256 exit(1);
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257 }
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258
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259
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88
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260 ngx_int_t
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261 ngx_init_signals(ngx_log_t *log)
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262 {
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263 ngx_signal_t *sig;
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264 struct sigaction sa;
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265
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266 for (sig = signals; sig->signo != 0; sig++) {
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267 ngx_memzero(&sa, sizeof(struct sigaction));
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268 sa.sa_handler = sig->handler;
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269 sigemptyset(&sa.sa_mask);
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270 if (sigaction(sig->signo, &sa, NULL) == -1) {
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271 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
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272 "sigaction(%s) failed", sig->signame);
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273 return NGX_ERROR;
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274 }
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275 }
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276
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277 return NGX_OK;
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278 }
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279
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280
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64
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281 void
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88
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282 ngx_signal_handler(int signo)
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283 {
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284 char *action;
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285 ngx_int_t ignore;
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286 ngx_err_t err;
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287 ngx_signal_t *sig;
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288
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289 ignore = 0;
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290
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291 err = ngx_errno;
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292
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293 for (sig = signals; sig->signo != 0; sig++) {
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294 if (sig->signo == signo) {
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295 break;
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296 }
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297 }
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298
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112
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299 ngx_time_update(0, 0);
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88
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300
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301 action = "";
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302
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303 switch (ngx_process) {
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304
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305 case NGX_PROCESS_MASTER:
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306 case NGX_PROCESS_SINGLE:
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307 switch (signo) {
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308
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309 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
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310 ngx_quit = 1;
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311 action = ", shutting down";
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312 break;
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313
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314 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
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315 case SIGINT:
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316 ngx_terminate = 1;
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317 action = ", exiting";
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318 break;
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319
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320 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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321 ngx_noaccept = 1;
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322 action = ", stop accepting connections";
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323 break;
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324
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325 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
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326 ngx_reconfigure = 1;
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327 action = ", reconfiguring";
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328 break;
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329
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330 case ngx_signal_value(NGX_REOPEN_SIGNAL):
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331 ngx_reopen = 1;
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332 action = ", reopening logs";
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333 break;
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334
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335 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
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336 if (getppid() > 1 || ngx_new_binary > 0) {
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337
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338 /*
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339 * Ignore the signal in the new binary if its parent is
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340 * not the init process, i.e. the old binary's process
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236
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341 * is still running. Or ignore the signal in the old binary's
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88
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342 * process if the new binary's process is already running.
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343 */
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344
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345 action = ", ignoring";
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346 ignore = 1;
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347 break;
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348 }
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349
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350 ngx_change_binary = 1;
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351 action = ", changing binary";
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352 break;
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353
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354 case SIGALRM:
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355 break;
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356
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357 case SIGIO:
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358 ngx_sigio = 1;
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359 break;
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360
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361 case SIGCHLD:
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362 ngx_reap = 1;
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363 break;
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364 }
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365
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366 break;
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367
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368 case NGX_PROCESS_WORKER:
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369 switch (signo) {
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370
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371 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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372 ngx_debug_quit = 1;
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373 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
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374 ngx_quit = 1;
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375 action = ", shutting down";
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376 break;
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377
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378 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
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379 case SIGINT:
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380 ngx_terminate = 1;
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381 action = ", exiting";
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382 break;
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383
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384 case ngx_signal_value(NGX_REOPEN_SIGNAL):
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385 ngx_reopen = 1;
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386 action = ", reopening logs";
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387 break;
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388
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389 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
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390 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
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391 case SIGIO:
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392 action = ", ignoring";
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393 break;
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394 }
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395
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396 break;
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397 }
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398
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399 ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
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400 "signal %d (%s) received%s", signo, sig->signame, action);
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401
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402 if (ignore) {
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403 ngx_log_error(NGX_LOG_CRIT, ngx_cycle->log, 0,
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404 "the changing binary signal is ignored: "
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405 "you should shutdown or terminate "
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406 "before either old or new binary's process");
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407 }
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408
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409 if (signo == SIGCHLD) {
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410 ngx_process_get_status();
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411 }
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412
|
|
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413 ngx_set_errno(err);
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|
|
414 }
|
|
|
415
|
|
|
416
|
|
|
417 static void
|
|
64
|
418 ngx_process_get_status(void)
|
|
0
|
419 {
|
|
|
420 int status;
|
|
|
421 char *process;
|
|
|
422 ngx_pid_t pid;
|
|
|
423 ngx_err_t err;
|
|
|
424 ngx_int_t i;
|
|
|
425 ngx_uint_t one;
|
|
26
|
426
|
|
0
|
427 one = 0;
|
|
|
428
|
|
|
429 for ( ;; ) {
|
|
|
430 pid = waitpid(-1, &status, WNOHANG);
|
|
|
431
|
|
|
432 if (pid == 0) {
|
|
|
433 return;
|
|
|
434 }
|
|
|
435
|
|
|
436 if (pid == -1) {
|
|
|
437 err = ngx_errno;
|
|
|
438
|
|
|
439 if (err == NGX_EINTR) {
|
|
|
440 continue;
|
|
|
441 }
|
|
|
442
|
|
|
443 if (err == NGX_ECHILD && one) {
|
|
|
444 return;
|
|
|
445 }
|
|
|
446
|
|
270
|
447 #if (NGX_SOLARIS || NGX_FREEBSD)
|
|
2
|
448
|
|
|
449 /*
|
|
|
450 * Solaris always calls the signal handler for each exited process
|
|
270
|
451 * despite waitpid() may be already called for this process.
|
|
|
452 *
|
|
|
453 * When several processes exit at the same time FreeBSD may
|
|
|
454 * erroneously call the signal handler for exited process
|
|
372
|
455 * despite waitpid() may be already called for this process.
|
|
2
|
456 */
|
|
|
457
|
|
|
458 if (err == NGX_ECHILD) {
|
|
|
459 ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, errno,
|
|
|
460 "waitpid() failed");
|
|
112
|
461 return;
|
|
2
|
462 }
|
|
|
463
|
|
|
464 #endif
|
|
|
465
|
|
0
|
466 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, errno,
|
|
|
467 "waitpid() failed");
|
|
2
|
468
|
|
0
|
469 return;
|
|
|
470 }
|
|
|
471
|
|
|
472
|
|
|
473 if (ngx_accept_mutex_ptr) {
|
|
|
474
|
|
|
475 /*
|
|
|
476 * unlock the accept mutex if the abnormally exited process
|
|
|
477 * held it
|
|
|
478 */
|
|
|
479
|
|
|
480 ngx_atomic_cmp_set(ngx_accept_mutex_ptr, pid, 0);
|
|
|
481 }
|
|
|
482
|
|
|
483
|
|
|
484 one = 1;
|
|
|
485 process = "unknown process";
|
|
|
486
|
|
|
487 for (i = 0; i < ngx_last_process; i++) {
|
|
|
488 if (ngx_processes[i].pid == pid) {
|
|
|
489 ngx_processes[i].status = status;
|
|
|
490 ngx_processes[i].exited = 1;
|
|
|
491 process = ngx_processes[i].name;
|
|
|
492 break;
|
|
|
493 }
|
|
|
494 }
|
|
|
495
|
|
|
496 if (WTERMSIG(status)) {
|
|
|
497 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
10
|
498 "%s %P exited on signal %d%s",
|
|
0
|
499 process, pid, WTERMSIG(status),
|
|
|
500 WCOREDUMP(status) ? " (core dumped)" : "");
|
|
|
501
|
|
|
502 } else {
|
|
26
|
503 ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
|
|
10
|
504 "%s %P exited with code %d",
|
|
0
|
505 process, pid, WEXITSTATUS(status));
|
|
|
506 }
|
|
|
507
|
|
|
508 if (WEXITSTATUS(status) == 2 && ngx_processes[i].respawn) {
|
|
|
509 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
372
|
510 "%s %P exited with fatal code %d "
|
|
|
511 "and can not be respawn",
|
|
|
512 process, pid, WEXITSTATUS(status));
|
|
0
|
513 ngx_processes[i].respawn = 0;
|
|
|
514 }
|
|
|
515 }
|
|
|
516 }
|
|
10
|
517
|
|
|
518
|
|
64
|
519 void
|
|
|
520 ngx_debug_point(void)
|
|
10
|
521 {
|
|
|
522 ngx_core_conf_t *ccf;
|
|
|
523
|
|
|
524 ccf = (ngx_core_conf_t *) ngx_get_conf(ngx_cycle->conf_ctx,
|
|
|
525 ngx_core_module);
|
|
|
526
|
|
|
527 switch (ccf->debug_points) {
|
|
|
528
|
|
|
529 case NGX_DEBUG_POINTS_STOP:
|
|
|
530 raise(SIGSTOP);
|
|
|
531 break;
|
|
|
532
|
|
|
533 case NGX_DEBUG_POINTS_ABORT:
|
|
112
|
534 ngx_abort();
|
|
10
|
535 }
|
|
|
536 }
|
