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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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482
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16 char *name;
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88
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17 void (*handler)(int signo);
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18 } ngx_signal_t;
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19
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20
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21
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0
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22 static void ngx_execute_proc(ngx_cycle_t *cycle, void *data);
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88
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23 static void ngx_signal_handler(int signo);
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24 static void ngx_process_get_status(void);
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0
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25
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2
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26
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27 int ngx_argc;
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28 char **ngx_argv;
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29 char **ngx_os_argv;
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30
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31 ngx_int_t ngx_process_slot;
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32 ngx_socket_t ngx_channel;
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33 ngx_int_t ngx_last_process;
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34 ngx_process_t ngx_processes[NGX_MAX_PROCESSES];
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0
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35
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36
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88
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37 ngx_signal_t signals[] = {
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38 { ngx_signal_value(NGX_RECONFIGURE_SIGNAL),
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39 "SIG" ngx_value(NGX_RECONFIGURE_SIGNAL),
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482
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40 "reload",
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88
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41 ngx_signal_handler },
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42
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43 { ngx_signal_value(NGX_REOPEN_SIGNAL),
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44 "SIG" ngx_value(NGX_REOPEN_SIGNAL),
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482
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45 "reopen",
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88
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46 ngx_signal_handler },
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47
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48 { ngx_signal_value(NGX_NOACCEPT_SIGNAL),
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49 "SIG" ngx_value(NGX_NOACCEPT_SIGNAL),
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482
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50 "",
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88
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51 ngx_signal_handler },
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52
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53 { ngx_signal_value(NGX_TERMINATE_SIGNAL),
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54 "SIG" ngx_value(NGX_TERMINATE_SIGNAL),
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482
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55 "stop",
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88
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56 ngx_signal_handler },
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57
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58 { ngx_signal_value(NGX_SHUTDOWN_SIGNAL),
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59 "SIG" ngx_value(NGX_SHUTDOWN_SIGNAL),
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482
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60 "quit",
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88
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61 ngx_signal_handler },
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62
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63 { ngx_signal_value(NGX_CHANGEBIN_SIGNAL),
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64 "SIG" ngx_value(NGX_CHANGEBIN_SIGNAL),
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482
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65 "",
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88
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66 ngx_signal_handler },
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67
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482
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68 { SIGALRM, "SIGALRM", "", ngx_signal_handler },
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88
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69
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482
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70 { SIGINT, "SIGINT", "", ngx_signal_handler },
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88
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71
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482
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72 { SIGIO, "SIGIO", "", ngx_signal_handler },
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88
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73
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482
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74 { SIGCHLD, "SIGCHLD", "", ngx_signal_handler },
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88
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75
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482
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76 { SIGPIPE, "SIGPIPE, SIG_IGN", "", SIG_IGN },
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88
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77
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482
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78 { 0, NULL, "", NULL }
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88
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79 };
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80
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81
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64
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82 ngx_pid_t
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83 ngx_spawn_process(ngx_cycle_t *cycle, ngx_spawn_proc_pt proc, void *data,
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84 char *name, ngx_int_t respawn)
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0
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85 {
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86 u_long on;
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87 ngx_pid_t pid;
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88 ngx_int_t s;
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89
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90 if (respawn >= 0) {
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91 s = respawn;
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92
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93 } else {
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94 for (s = 0; s < ngx_last_process; s++) {
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95 if (ngx_processes[s].pid == -1) {
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96 break;
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97 }
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98 }
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99
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100 if (s == NGX_MAX_PROCESSES) {
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101 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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102 "no more than %d processes can be spawned",
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103 NGX_MAX_PROCESSES);
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92
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104 return NGX_INVALID_PID;
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0
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105 }
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106 }
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107
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108
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109 if (respawn != NGX_PROCESS_DETACHED) {
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110
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111 /* Solaris 9 still has no AF_LOCAL */
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112
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113 if (socketpair(AF_UNIX, SOCK_STREAM, 0, ngx_processes[s].channel) == -1)
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114 {
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115 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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116 "socketpair() failed while spawning \"%s\"", name);
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92
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117 return NGX_INVALID_PID;
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0
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118 }
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119
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120 ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
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121 "channel %d:%d",
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122 ngx_processes[s].channel[0],
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123 ngx_processes[s].channel[1]);
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124
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125 if (ngx_nonblocking(ngx_processes[s].channel[0]) == -1) {
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126 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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127 ngx_nonblocking_n " failed while spawning \"%s\"",
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128 name);
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129 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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130 return NGX_INVALID_PID;
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0
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131 }
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132
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133 if (ngx_nonblocking(ngx_processes[s].channel[1]) == -1) {
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134 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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135 ngx_nonblocking_n " failed while spawning \"%s\"",
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136 name);
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137 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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138 return NGX_INVALID_PID;
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0
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139 }
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140
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141 on = 1;
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142 if (ioctl(ngx_processes[s].channel[0], FIOASYNC, &on) == -1) {
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143 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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144 "ioctl(FIOASYNC) 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_SETOWN, ngx_pid) == -1) {
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150 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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151 "fcntl(F_SETOWN) failed while spawning \"%s\"", name);
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152 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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153 return NGX_INVALID_PID;
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0
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154 }
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155
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156 if (fcntl(ngx_processes[s].channel[0], F_SETFD, FD_CLOEXEC) == -1) {
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157 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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158 "fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
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159 name);
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160 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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161 return NGX_INVALID_PID;
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0
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162 }
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163
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164 if (fcntl(ngx_processes[s].channel[1], F_SETFD, FD_CLOEXEC) == -1) {
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165 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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166 "fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
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167 name);
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168 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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169 return NGX_INVALID_PID;
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0
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170 }
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171
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172 ngx_channel = ngx_processes[s].channel[1];
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173
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174 } else {
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175 ngx_processes[s].channel[0] = -1;
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176 ngx_processes[s].channel[1] = -1;
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177 }
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178
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179 ngx_process_slot = s;
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180
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181
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182 pid = fork();
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183
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184 switch (pid) {
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185
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186 case -1:
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187 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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188 "fork() failed while spawning \"%s\"", name);
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189 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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190 return NGX_INVALID_PID;
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0
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191
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192 case 0:
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193 ngx_pid = ngx_getpid();
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194 proc(cycle, data);
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195 break;
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196
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197 default:
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198 break;
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199 }
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200
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26
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201 ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "start %s %P", name, pid);
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0
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202
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203 ngx_processes[s].pid = pid;
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204 ngx_processes[s].exited = 0;
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205
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206 if (respawn >= 0) {
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207 return pid;
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208 }
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209
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210 ngx_processes[s].proc = proc;
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211 ngx_processes[s].data = data;
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212 ngx_processes[s].name = name;
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213 ngx_processes[s].exiting = 0;
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214
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215 switch (respawn) {
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216
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217 case NGX_PROCESS_RESPAWN:
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218 ngx_processes[s].respawn = 1;
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219 ngx_processes[s].just_respawn = 0;
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220 ngx_processes[s].detached = 0;
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221 break;
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222
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223 case NGX_PROCESS_JUST_RESPAWN:
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224 ngx_processes[s].respawn = 1;
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225 ngx_processes[s].just_respawn = 1;
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226 ngx_processes[s].detached = 0;
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227 break;
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228
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229 case NGX_PROCESS_DETACHED:
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230 ngx_processes[s].respawn = 0;
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231 ngx_processes[s].just_respawn = 0;
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232 ngx_processes[s].detached = 1;
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233 break;
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234 }
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235
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236 if (s == ngx_last_process) {
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237 ngx_last_process++;
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238 }
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239
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240 return pid;
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241 }
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242
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243
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64
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244 ngx_pid_t
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245 ngx_execute(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx)
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0
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246 {
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247 return ngx_spawn_process(cycle, ngx_execute_proc, ctx, ctx->name,
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248 NGX_PROCESS_DETACHED);
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249 }
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250
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251
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64
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252 static void
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253 ngx_execute_proc(ngx_cycle_t *cycle, void *data)
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0
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254 {
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255 ngx_exec_ctx_t *ctx = data;
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256
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257 if (execve(ctx->path, ctx->argv, ctx->envp) == -1) {
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258 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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259 "execve() failed while executing %s \"%s\"",
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260 ctx->name, ctx->path);
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261 }
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262
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263 exit(1);
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264 }
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265
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266
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88
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267 ngx_int_t
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268 ngx_init_signals(ngx_log_t *log)
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269 {
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270 ngx_signal_t *sig;
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271 struct sigaction sa;
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272
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273 for (sig = signals; sig->signo != 0; sig++) {
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274 ngx_memzero(&sa, sizeof(struct sigaction));
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275 sa.sa_handler = sig->handler;
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276 sigemptyset(&sa.sa_mask);
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277 if (sigaction(sig->signo, &sa, NULL) == -1) {
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278 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
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279 "sigaction(%s) failed", sig->signame);
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280 return NGX_ERROR;
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281 }
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282 }
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283
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284 return NGX_OK;
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285 }
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286
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287
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64
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288 void
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88
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289 ngx_signal_handler(int signo)
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290 {
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291 char *action;
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292 ngx_int_t ignore;
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293 ngx_err_t err;
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294 ngx_signal_t *sig;
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295
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296 ignore = 0;
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297
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298 err = ngx_errno;
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299
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300 for (sig = signals; sig->signo != 0; sig++) {
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301 if (sig->signo == signo) {
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302 break;
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303 }
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304 }
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305
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112
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306 ngx_time_update(0, 0);
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88
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307
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308 action = "";
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309
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310 switch (ngx_process) {
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311
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312 case NGX_PROCESS_MASTER:
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313 case NGX_PROCESS_SINGLE:
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314 switch (signo) {
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315
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316 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
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317 ngx_quit = 1;
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318 action = ", shutting down";
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319 break;
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320
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321 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
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322 case SIGINT:
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323 ngx_terminate = 1;
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324 action = ", exiting";
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325 break;
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326
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327 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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328 ngx_noaccept = 1;
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329 action = ", stop accepting connections";
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330 break;
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331
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332 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
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333 ngx_reconfigure = 1;
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334 action = ", reconfiguring";
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335 break;
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336
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337 case ngx_signal_value(NGX_REOPEN_SIGNAL):
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338 ngx_reopen = 1;
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339 action = ", reopening logs";
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340 break;
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341
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342 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
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343 if (getppid() > 1 || ngx_new_binary > 0) {
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344
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345 /*
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346 * Ignore the signal in the new binary if its parent is
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347 * not the init process, i.e. the old binary's process
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236
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348 * is still running. Or ignore the signal in the old binary's
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88
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349 * process if the new binary's process is already running.
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350 */
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351
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352 action = ", ignoring";
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353 ignore = 1;
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354 break;
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355 }
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356
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357 ngx_change_binary = 1;
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358 action = ", changing binary";
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359 break;
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360
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361 case SIGALRM:
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362 break;
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363
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364 case SIGIO:
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365 ngx_sigio = 1;
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366 break;
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367
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368 case SIGCHLD:
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369 ngx_reap = 1;
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370 break;
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371 }
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372
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373 break;
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374
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375 case NGX_PROCESS_WORKER:
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376 switch (signo) {
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377
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378 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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379 ngx_debug_quit = 1;
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380 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
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381 ngx_quit = 1;
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382 action = ", shutting down";
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383 break;
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384
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385 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
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386 case SIGINT:
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387 ngx_terminate = 1;
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388 action = ", exiting";
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389 break;
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390
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391 case ngx_signal_value(NGX_REOPEN_SIGNAL):
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392 ngx_reopen = 1;
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393 action = ", reopening logs";
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394 break;
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395
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396 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
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397 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
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398 case SIGIO:
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399 action = ", ignoring";
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400 break;
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401 }
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402
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403 break;
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404 }
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405
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406 ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
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407 "signal %d (%s) received%s", signo, sig->signame, action);
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|
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408
|
|
|
409 if (ignore) {
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410 ngx_log_error(NGX_LOG_CRIT, ngx_cycle->log, 0,
|
|
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411 "the changing binary signal is ignored: "
|
|
|
412 "you should shutdown or terminate "
|
|
|
413 "before either old or new binary's process");
|
|
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414 }
|
|
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415
|
|
|
416 if (signo == SIGCHLD) {
|
|
|
417 ngx_process_get_status();
|
|
|
418 }
|
|
|
419
|
|
|
420 ngx_set_errno(err);
|
|
|
421 }
|
|
|
422
|
|
|
423
|
|
|
424 static void
|
|
64
|
425 ngx_process_get_status(void)
|
|
0
|
426 {
|
|
|
427 int status;
|
|
|
428 char *process;
|
|
|
429 ngx_pid_t pid;
|
|
|
430 ngx_err_t err;
|
|
|
431 ngx_int_t i;
|
|
|
432 ngx_uint_t one;
|
|
26
|
433
|
|
0
|
434 one = 0;
|
|
|
435
|
|
|
436 for ( ;; ) {
|
|
|
437 pid = waitpid(-1, &status, WNOHANG);
|
|
|
438
|
|
|
439 if (pid == 0) {
|
|
|
440 return;
|
|
|
441 }
|
|
|
442
|
|
|
443 if (pid == -1) {
|
|
|
444 err = ngx_errno;
|
|
|
445
|
|
|
446 if (err == NGX_EINTR) {
|
|
|
447 continue;
|
|
|
448 }
|
|
|
449
|
|
|
450 if (err == NGX_ECHILD && one) {
|
|
|
451 return;
|
|
|
452 }
|
|
|
453
|
|
270
|
454 #if (NGX_SOLARIS || NGX_FREEBSD)
|
|
2
|
455
|
|
|
456 /*
|
|
|
457 * Solaris always calls the signal handler for each exited process
|
|
270
|
458 * despite waitpid() may be already called for this process.
|
|
|
459 *
|
|
|
460 * When several processes exit at the same time FreeBSD may
|
|
|
461 * erroneously call the signal handler for exited process
|
|
372
|
462 * despite waitpid() may be already called for this process.
|
|
2
|
463 */
|
|
|
464
|
|
|
465 if (err == NGX_ECHILD) {
|
|
|
466 ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, errno,
|
|
|
467 "waitpid() failed");
|
|
112
|
468 return;
|
|
2
|
469 }
|
|
|
470
|
|
|
471 #endif
|
|
|
472
|
|
0
|
473 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, errno,
|
|
|
474 "waitpid() failed");
|
|
2
|
475
|
|
0
|
476 return;
|
|
|
477 }
|
|
|
478
|
|
|
479
|
|
|
480 if (ngx_accept_mutex_ptr) {
|
|
|
481
|
|
|
482 /*
|
|
|
483 * unlock the accept mutex if the abnormally exited process
|
|
|
484 * held it
|
|
|
485 */
|
|
|
486
|
|
|
487 ngx_atomic_cmp_set(ngx_accept_mutex_ptr, pid, 0);
|
|
|
488 }
|
|
|
489
|
|
|
490
|
|
|
491 one = 1;
|
|
|
492 process = "unknown process";
|
|
|
493
|
|
|
494 for (i = 0; i < ngx_last_process; i++) {
|
|
|
495 if (ngx_processes[i].pid == pid) {
|
|
|
496 ngx_processes[i].status = status;
|
|
|
497 ngx_processes[i].exited = 1;
|
|
|
498 process = ngx_processes[i].name;
|
|
|
499 break;
|
|
|
500 }
|
|
|
501 }
|
|
|
502
|
|
|
503 if (WTERMSIG(status)) {
|
|
444
|
504 #ifdef WCOREDUMP
|
|
0
|
505 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
10
|
506 "%s %P exited on signal %d%s",
|
|
0
|
507 process, pid, WTERMSIG(status),
|
|
|
508 WCOREDUMP(status) ? " (core dumped)" : "");
|
|
444
|
509 #else
|
|
|
510 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
|
511 "%s %P exited on signal %d",
|
|
|
512 process, pid, WTERMSIG(status));
|
|
|
513 #endif
|
|
0
|
514
|
|
|
515 } else {
|
|
26
|
516 ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
|
|
10
|
517 "%s %P exited with code %d",
|
|
0
|
518 process, pid, WEXITSTATUS(status));
|
|
|
519 }
|
|
|
520
|
|
|
521 if (WEXITSTATUS(status) == 2 && ngx_processes[i].respawn) {
|
|
|
522 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
372
|
523 "%s %P exited with fatal code %d "
|
|
|
524 "and can not be respawn",
|
|
|
525 process, pid, WEXITSTATUS(status));
|
|
0
|
526 ngx_processes[i].respawn = 0;
|
|
|
527 }
|
|
|
528 }
|
|
|
529 }
|
|
10
|
530
|
|
|
531
|
|
64
|
532 void
|
|
|
533 ngx_debug_point(void)
|
|
10
|
534 {
|
|
|
535 ngx_core_conf_t *ccf;
|
|
|
536
|
|
|
537 ccf = (ngx_core_conf_t *) ngx_get_conf(ngx_cycle->conf_ctx,
|
|
|
538 ngx_core_module);
|
|
|
539
|
|
|
540 switch (ccf->debug_points) {
|
|
|
541
|
|
|
542 case NGX_DEBUG_POINTS_STOP:
|
|
|
543 raise(SIGSTOP);
|
|
|
544 break;
|
|
|
545
|
|
|
546 case NGX_DEBUG_POINTS_ABORT:
|
|
112
|
547 ngx_abort();
|
|
10
|
548 }
|
|
|
549 }
|
|
482
|
550
|
|
|
551
|
|
|
552 ngx_int_t
|
|
|
553 ngx_os_signal_process(ngx_cycle_t *cycle, char *name, ngx_int_t pid)
|
|
|
554 {
|
|
|
555 ngx_signal_t *sig;
|
|
|
556
|
|
|
557 for (sig = signals; sig->signo != 0; sig++) {
|
|
|
558 if (ngx_strcmp(name, sig->name) == 0) {
|
|
|
559 if (kill(pid, sig->signo) != -1) {
|
|
|
560 return 0;
|
|
|
561 }
|
|
|
562
|
|
|
563 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
564 "kill(%P, %d) failed", pid, sig->signo);
|
|
|
565 }
|
|
|
566 }
|
|
|
567
|
|
|
568 return 1;
|
|
|
569 }
|
