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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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518
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76 { SIGSYS, "SIGSYS, SIG_IGN", "", SIG_IGN },
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77
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482
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78 { SIGPIPE, "SIGPIPE, SIG_IGN", "", SIG_IGN },
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88
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79
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482
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80 { 0, NULL, "", NULL }
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88
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81 };
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82
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83
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64
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84 ngx_pid_t
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85 ngx_spawn_process(ngx_cycle_t *cycle, ngx_spawn_proc_pt proc, void *data,
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86 char *name, ngx_int_t respawn)
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0
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87 {
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88 u_long on;
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89 ngx_pid_t pid;
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90 ngx_int_t s;
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91
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92 if (respawn >= 0) {
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93 s = respawn;
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94
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95 } else {
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96 for (s = 0; s < ngx_last_process; s++) {
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97 if (ngx_processes[s].pid == -1) {
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98 break;
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99 }
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100 }
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101
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102 if (s == NGX_MAX_PROCESSES) {
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103 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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104 "no more than %d processes can be spawned",
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105 NGX_MAX_PROCESSES);
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92
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106 return NGX_INVALID_PID;
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0
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107 }
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108 }
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109
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110
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111 if (respawn != NGX_PROCESS_DETACHED) {
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112
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113 /* Solaris 9 still has no AF_LOCAL */
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114
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115 if (socketpair(AF_UNIX, SOCK_STREAM, 0, ngx_processes[s].channel) == -1)
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116 {
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117 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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118 "socketpair() failed while spawning \"%s\"", name);
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92
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119 return NGX_INVALID_PID;
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0
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120 }
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121
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122 ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
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123 "channel %d:%d",
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124 ngx_processes[s].channel[0],
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125 ngx_processes[s].channel[1]);
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126
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127 if (ngx_nonblocking(ngx_processes[s].channel[0]) == -1) {
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128 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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129 ngx_nonblocking_n " failed while spawning \"%s\"",
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130 name);
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131 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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132 return NGX_INVALID_PID;
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0
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133 }
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134
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135 if (ngx_nonblocking(ngx_processes[s].channel[1]) == -1) {
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136 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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137 ngx_nonblocking_n " failed while spawning \"%s\"",
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138 name);
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139 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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140 return NGX_INVALID_PID;
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0
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141 }
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142
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143 on = 1;
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144 if (ioctl(ngx_processes[s].channel[0], FIOASYNC, &on) == -1) {
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145 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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146 "ioctl(FIOASYNC) failed while spawning \"%s\"", name);
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147 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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148 return NGX_INVALID_PID;
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0
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149 }
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150
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151 if (fcntl(ngx_processes[s].channel[0], F_SETOWN, ngx_pid) == -1) {
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152 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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153 "fcntl(F_SETOWN) failed while spawning \"%s\"", name);
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154 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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155 return NGX_INVALID_PID;
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0
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156 }
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157
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158 if (fcntl(ngx_processes[s].channel[0], F_SETFD, FD_CLOEXEC) == -1) {
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159 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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160 "fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
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161 name);
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162 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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163 return NGX_INVALID_PID;
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0
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164 }
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165
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166 if (fcntl(ngx_processes[s].channel[1], F_SETFD, FD_CLOEXEC) == -1) {
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167 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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168 "fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
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169 name);
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170 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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171 return NGX_INVALID_PID;
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0
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172 }
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173
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174 ngx_channel = ngx_processes[s].channel[1];
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175
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176 } else {
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177 ngx_processes[s].channel[0] = -1;
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178 ngx_processes[s].channel[1] = -1;
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179 }
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180
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181 ngx_process_slot = s;
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182
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183
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184 pid = fork();
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185
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186 switch (pid) {
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187
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188 case -1:
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189 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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190 "fork() failed while spawning \"%s\"", name);
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191 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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192 return NGX_INVALID_PID;
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0
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193
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194 case 0:
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195 ngx_pid = ngx_getpid();
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196 proc(cycle, data);
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197 break;
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198
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199 default:
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200 break;
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201 }
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202
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26
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203 ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "start %s %P", name, pid);
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0
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204
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205 ngx_processes[s].pid = pid;
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206 ngx_processes[s].exited = 0;
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207
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208 if (respawn >= 0) {
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209 return pid;
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210 }
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211
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212 ngx_processes[s].proc = proc;
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213 ngx_processes[s].data = data;
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214 ngx_processes[s].name = name;
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215 ngx_processes[s].exiting = 0;
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216
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217 switch (respawn) {
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218
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514
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219 case NGX_PROCESS_NORESPAWN:
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220 ngx_processes[s].respawn = 0;
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221 ngx_processes[s].just_spawn = 0;
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222 ngx_processes[s].detached = 0;
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223 break;
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224
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225 case NGX_PROCESS_JUST_SPAWN:
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226 ngx_processes[s].respawn = 0;
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227 ngx_processes[s].just_spawn = 1;
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228 ngx_processes[s].detached = 0;
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229 break;
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230
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0
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231 case NGX_PROCESS_RESPAWN:
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232 ngx_processes[s].respawn = 1;
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514
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233 ngx_processes[s].just_spawn = 0;
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0
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234 ngx_processes[s].detached = 0;
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235 break;
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236
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237 case NGX_PROCESS_JUST_RESPAWN:
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238 ngx_processes[s].respawn = 1;
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514
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239 ngx_processes[s].just_spawn = 1;
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0
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240 ngx_processes[s].detached = 0;
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241 break;
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242
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243 case NGX_PROCESS_DETACHED:
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244 ngx_processes[s].respawn = 0;
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514
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245 ngx_processes[s].just_spawn = 0;
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0
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246 ngx_processes[s].detached = 1;
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247 break;
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248 }
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249
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250 if (s == ngx_last_process) {
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251 ngx_last_process++;
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252 }
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253
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254 return pid;
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255 }
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256
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257
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64
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258 ngx_pid_t
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259 ngx_execute(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx)
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0
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260 {
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261 return ngx_spawn_process(cycle, ngx_execute_proc, ctx, ctx->name,
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262 NGX_PROCESS_DETACHED);
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263 }
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264
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265
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64
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266 static void
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267 ngx_execute_proc(ngx_cycle_t *cycle, void *data)
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0
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268 {
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269 ngx_exec_ctx_t *ctx = data;
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270
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271 if (execve(ctx->path, ctx->argv, ctx->envp) == -1) {
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272 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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273 "execve() failed while executing %s \"%s\"",
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274 ctx->name, ctx->path);
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275 }
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276
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277 exit(1);
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278 }
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279
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280
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88
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281 ngx_int_t
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282 ngx_init_signals(ngx_log_t *log)
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283 {
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284 ngx_signal_t *sig;
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285 struct sigaction sa;
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286
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287 for (sig = signals; sig->signo != 0; sig++) {
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288 ngx_memzero(&sa, sizeof(struct sigaction));
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289 sa.sa_handler = sig->handler;
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290 sigemptyset(&sa.sa_mask);
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291 if (sigaction(sig->signo, &sa, NULL) == -1) {
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292 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
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293 "sigaction(%s) failed", sig->signame);
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294 return NGX_ERROR;
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295 }
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296 }
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297
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298 return NGX_OK;
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299 }
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300
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301
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64
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302 void
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88
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303 ngx_signal_handler(int signo)
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304 {
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305 char *action;
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306 ngx_int_t ignore;
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307 ngx_err_t err;
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308 ngx_signal_t *sig;
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309
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310 ignore = 0;
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311
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312 err = ngx_errno;
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313
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314 for (sig = signals; sig->signo != 0; sig++) {
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315 if (sig->signo == signo) {
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316 break;
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317 }
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318 }
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319
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112
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320 ngx_time_update(0, 0);
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88
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321
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322 action = "";
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323
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324 switch (ngx_process) {
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325
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326 case NGX_PROCESS_MASTER:
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327 case NGX_PROCESS_SINGLE:
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328 switch (signo) {
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329
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330 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
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331 ngx_quit = 1;
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332 action = ", shutting down";
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333 break;
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334
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335 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
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336 case SIGINT:
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337 ngx_terminate = 1;
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338 action = ", exiting";
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339 break;
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340
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341 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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342 ngx_noaccept = 1;
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343 action = ", stop accepting connections";
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344 break;
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345
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346 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
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347 ngx_reconfigure = 1;
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348 action = ", reconfiguring";
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349 break;
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350
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351 case ngx_signal_value(NGX_REOPEN_SIGNAL):
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352 ngx_reopen = 1;
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353 action = ", reopening logs";
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354 break;
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355
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356 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
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357 if (getppid() > 1 || ngx_new_binary > 0) {
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358
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359 /*
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360 * Ignore the signal in the new binary if its parent is
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361 * not the init process, i.e. the old binary's process
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236
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362 * is still running. Or ignore the signal in the old binary's
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88
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363 * process if the new binary's process is already running.
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364 */
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365
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366 action = ", ignoring";
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367 ignore = 1;
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368 break;
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369 }
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370
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371 ngx_change_binary = 1;
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372 action = ", changing binary";
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373 break;
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374
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375 case SIGALRM:
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518
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376 ngx_sigalrm = 1;
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88
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377 break;
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378
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379 case SIGIO:
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380 ngx_sigio = 1;
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381 break;
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382
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383 case SIGCHLD:
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384 ngx_reap = 1;
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385 break;
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386 }
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387
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388 break;
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389
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390 case NGX_PROCESS_WORKER:
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552
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391 case NGX_PROCESS_HELPER:
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88
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392 switch (signo) {
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393
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394 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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395 ngx_debug_quit = 1;
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396 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
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397 ngx_quit = 1;
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398 action = ", shutting down";
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399 break;
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400
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401 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
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402 case SIGINT:
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403 ngx_terminate = 1;
|
|
|
404 action = ", exiting";
|
|
|
405 break;
|
|
|
406
|
|
|
407 case ngx_signal_value(NGX_REOPEN_SIGNAL):
|
|
|
408 ngx_reopen = 1;
|
|
|
409 action = ", reopening logs";
|
|
|
410 break;
|
|
|
411
|
|
|
412 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
|
|
|
413 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
|
|
|
414 case SIGIO:
|
|
|
415 action = ", ignoring";
|
|
|
416 break;
|
|
|
417 }
|
|
|
418
|
|
|
419 break;
|
|
|
420 }
|
|
|
421
|
|
|
422 ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
|
|
|
423 "signal %d (%s) received%s", signo, sig->signame, action);
|
|
|
424
|
|
|
425 if (ignore) {
|
|
|
426 ngx_log_error(NGX_LOG_CRIT, ngx_cycle->log, 0,
|
|
|
427 "the changing binary signal is ignored: "
|
|
|
428 "you should shutdown or terminate "
|
|
|
429 "before either old or new binary's process");
|
|
|
430 }
|
|
|
431
|
|
|
432 if (signo == SIGCHLD) {
|
|
|
433 ngx_process_get_status();
|
|
|
434 }
|
|
|
435
|
|
|
436 ngx_set_errno(err);
|
|
|
437 }
|
|
|
438
|
|
|
439
|
|
|
440 static void
|
|
64
|
441 ngx_process_get_status(void)
|
|
0
|
442 {
|
|
|
443 int status;
|
|
|
444 char *process;
|
|
|
445 ngx_pid_t pid;
|
|
|
446 ngx_err_t err;
|
|
|
447 ngx_int_t i;
|
|
|
448 ngx_uint_t one;
|
|
26
|
449
|
|
0
|
450 one = 0;
|
|
|
451
|
|
|
452 for ( ;; ) {
|
|
|
453 pid = waitpid(-1, &status, WNOHANG);
|
|
|
454
|
|
|
455 if (pid == 0) {
|
|
|
456 return;
|
|
|
457 }
|
|
|
458
|
|
|
459 if (pid == -1) {
|
|
|
460 err = ngx_errno;
|
|
|
461
|
|
|
462 if (err == NGX_EINTR) {
|
|
|
463 continue;
|
|
|
464 }
|
|
|
465
|
|
|
466 if (err == NGX_ECHILD && one) {
|
|
|
467 return;
|
|
|
468 }
|
|
|
469
|
|
270
|
470 #if (NGX_SOLARIS || NGX_FREEBSD)
|
|
2
|
471
|
|
|
472 /*
|
|
|
473 * Solaris always calls the signal handler for each exited process
|
|
270
|
474 * despite waitpid() may be already called for this process.
|
|
|
475 *
|
|
|
476 * When several processes exit at the same time FreeBSD may
|
|
|
477 * erroneously call the signal handler for exited process
|
|
372
|
478 * despite waitpid() may be already called for this process.
|
|
2
|
479 */
|
|
|
480
|
|
|
481 if (err == NGX_ECHILD) {
|
|
|
482 ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, errno,
|
|
|
483 "waitpid() failed");
|
|
112
|
484 return;
|
|
2
|
485 }
|
|
|
486
|
|
|
487 #endif
|
|
|
488
|
|
0
|
489 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, errno,
|
|
|
490 "waitpid() failed");
|
|
2
|
491
|
|
0
|
492 return;
|
|
|
493 }
|
|
|
494
|
|
|
495
|
|
|
496 if (ngx_accept_mutex_ptr) {
|
|
|
497
|
|
|
498 /*
|
|
|
499 * unlock the accept mutex if the abnormally exited process
|
|
|
500 * held it
|
|
|
501 */
|
|
|
502
|
|
|
503 ngx_atomic_cmp_set(ngx_accept_mutex_ptr, pid, 0);
|
|
|
504 }
|
|
|
505
|
|
|
506
|
|
|
507 one = 1;
|
|
|
508 process = "unknown process";
|
|
|
509
|
|
|
510 for (i = 0; i < ngx_last_process; i++) {
|
|
|
511 if (ngx_processes[i].pid == pid) {
|
|
|
512 ngx_processes[i].status = status;
|
|
|
513 ngx_processes[i].exited = 1;
|
|
|
514 process = ngx_processes[i].name;
|
|
|
515 break;
|
|
|
516 }
|
|
|
517 }
|
|
|
518
|
|
|
519 if (WTERMSIG(status)) {
|
|
444
|
520 #ifdef WCOREDUMP
|
|
0
|
521 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
10
|
522 "%s %P exited on signal %d%s",
|
|
0
|
523 process, pid, WTERMSIG(status),
|
|
|
524 WCOREDUMP(status) ? " (core dumped)" : "");
|
|
444
|
525 #else
|
|
|
526 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
|
527 "%s %P exited on signal %d",
|
|
|
528 process, pid, WTERMSIG(status));
|
|
|
529 #endif
|
|
0
|
530
|
|
|
531 } else {
|
|
26
|
532 ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
|
|
10
|
533 "%s %P exited with code %d",
|
|
0
|
534 process, pid, WEXITSTATUS(status));
|
|
|
535 }
|
|
|
536
|
|
|
537 if (WEXITSTATUS(status) == 2 && ngx_processes[i].respawn) {
|
|
|
538 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
372
|
539 "%s %P exited with fatal code %d "
|
|
|
540 "and can not be respawn",
|
|
|
541 process, pid, WEXITSTATUS(status));
|
|
0
|
542 ngx_processes[i].respawn = 0;
|
|
|
543 }
|
|
|
544 }
|
|
|
545 }
|
|
10
|
546
|
|
|
547
|
|
64
|
548 void
|
|
|
549 ngx_debug_point(void)
|
|
10
|
550 {
|
|
|
551 ngx_core_conf_t *ccf;
|
|
|
552
|
|
|
553 ccf = (ngx_core_conf_t *) ngx_get_conf(ngx_cycle->conf_ctx,
|
|
|
554 ngx_core_module);
|
|
|
555
|
|
|
556 switch (ccf->debug_points) {
|
|
|
557
|
|
|
558 case NGX_DEBUG_POINTS_STOP:
|
|
|
559 raise(SIGSTOP);
|
|
|
560 break;
|
|
|
561
|
|
|
562 case NGX_DEBUG_POINTS_ABORT:
|
|
112
|
563 ngx_abort();
|
|
10
|
564 }
|
|
|
565 }
|
|
482
|
566
|
|
|
567
|
|
|
568 ngx_int_t
|
|
|
569 ngx_os_signal_process(ngx_cycle_t *cycle, char *name, ngx_int_t pid)
|
|
|
570 {
|
|
|
571 ngx_signal_t *sig;
|
|
|
572
|
|
|
573 for (sig = signals; sig->signo != 0; sig++) {
|
|
|
574 if (ngx_strcmp(name, sig->name) == 0) {
|
|
|
575 if (kill(pid, sig->signo) != -1) {
|
|
|
576 return 0;
|
|
|
577 }
|
|
|
578
|
|
|
579 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
580 "kill(%P, %d) failed", pid, sig->signo);
|
|
|
581 }
|
|
|
582 }
|
|
|
583
|
|
|
584 return 1;
|
|
|
585 }
|
