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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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586
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14 int signo;
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15 char *signame;
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16 char *name;
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17 void (*handler)(int signo);
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88
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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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650
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25 static void ngx_unlock_mutexes(ngx_pid_t pid);
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0
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26
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2
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27
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28 int ngx_argc;
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29 char **ngx_argv;
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30 char **ngx_os_argv;
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31
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32 ngx_int_t ngx_process_slot;
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33 ngx_socket_t ngx_channel;
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34 ngx_int_t ngx_last_process;
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35 ngx_process_t ngx_processes[NGX_MAX_PROCESSES];
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0
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36
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37
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88
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38 ngx_signal_t signals[] = {
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39 { ngx_signal_value(NGX_RECONFIGURE_SIGNAL),
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40 "SIG" ngx_value(NGX_RECONFIGURE_SIGNAL),
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482
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41 "reload",
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88
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42 ngx_signal_handler },
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43
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44 { ngx_signal_value(NGX_REOPEN_SIGNAL),
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45 "SIG" ngx_value(NGX_REOPEN_SIGNAL),
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482
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46 "reopen",
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88
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47 ngx_signal_handler },
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48
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49 { ngx_signal_value(NGX_NOACCEPT_SIGNAL),
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50 "SIG" ngx_value(NGX_NOACCEPT_SIGNAL),
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482
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51 "",
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88
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52 ngx_signal_handler },
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53
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54 { ngx_signal_value(NGX_TERMINATE_SIGNAL),
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55 "SIG" ngx_value(NGX_TERMINATE_SIGNAL),
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482
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56 "stop",
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88
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57 ngx_signal_handler },
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58
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59 { ngx_signal_value(NGX_SHUTDOWN_SIGNAL),
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60 "SIG" ngx_value(NGX_SHUTDOWN_SIGNAL),
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482
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61 "quit",
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88
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62 ngx_signal_handler },
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63
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64 { ngx_signal_value(NGX_CHANGEBIN_SIGNAL),
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65 "SIG" ngx_value(NGX_CHANGEBIN_SIGNAL),
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482
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66 "",
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88
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67 ngx_signal_handler },
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68
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482
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69 { SIGALRM, "SIGALRM", "", ngx_signal_handler },
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88
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70
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482
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71 { SIGINT, "SIGINT", "", ngx_signal_handler },
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88
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72
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482
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73 { SIGIO, "SIGIO", "", ngx_signal_handler },
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88
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74
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482
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75 { SIGCHLD, "SIGCHLD", "", ngx_signal_handler },
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88
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76
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518
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77 { SIGSYS, "SIGSYS, SIG_IGN", "", SIG_IGN },
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78
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482
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79 { SIGPIPE, "SIGPIPE, SIG_IGN", "", SIG_IGN },
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88
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80
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482
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81 { 0, NULL, "", NULL }
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88
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82 };
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83
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84
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64
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85 ngx_pid_t
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86 ngx_spawn_process(ngx_cycle_t *cycle, ngx_spawn_proc_pt proc, void *data,
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87 char *name, ngx_int_t respawn)
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0
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88 {
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89 u_long on;
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90 ngx_pid_t pid;
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91 ngx_int_t s;
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92
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93 if (respawn >= 0) {
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94 s = respawn;
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95
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96 } else {
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97 for (s = 0; s < ngx_last_process; s++) {
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98 if (ngx_processes[s].pid == -1) {
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99 break;
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100 }
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101 }
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102
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103 if (s == NGX_MAX_PROCESSES) {
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104 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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105 "no more than %d processes can be spawned",
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106 NGX_MAX_PROCESSES);
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92
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107 return NGX_INVALID_PID;
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0
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108 }
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109 }
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110
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111
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112 if (respawn != NGX_PROCESS_DETACHED) {
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113
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114 /* Solaris 9 still has no AF_LOCAL */
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115
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116 if (socketpair(AF_UNIX, SOCK_STREAM, 0, ngx_processes[s].channel) == -1)
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117 {
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118 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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119 "socketpair() failed while spawning \"%s\"", name);
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92
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120 return NGX_INVALID_PID;
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0
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121 }
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122
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123 ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
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124 "channel %d:%d",
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125 ngx_processes[s].channel[0],
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126 ngx_processes[s].channel[1]);
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127
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128 if (ngx_nonblocking(ngx_processes[s].channel[0]) == -1) {
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129 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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130 ngx_nonblocking_n " failed while spawning \"%s\"",
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131 name);
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132 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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133 return NGX_INVALID_PID;
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0
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134 }
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135
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136 if (ngx_nonblocking(ngx_processes[s].channel[1]) == -1) {
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137 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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138 ngx_nonblocking_n " failed while spawning \"%s\"",
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139 name);
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140 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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141 return NGX_INVALID_PID;
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0
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142 }
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143
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144 on = 1;
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145 if (ioctl(ngx_processes[s].channel[0], FIOASYNC, &on) == -1) {
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146 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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147 "ioctl(FIOASYNC) failed while spawning \"%s\"", name);
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148 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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149 return NGX_INVALID_PID;
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0
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150 }
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151
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152 if (fcntl(ngx_processes[s].channel[0], F_SETOWN, ngx_pid) == -1) {
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153 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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154 "fcntl(F_SETOWN) failed while spawning \"%s\"", name);
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155 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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156 return NGX_INVALID_PID;
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0
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157 }
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158
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159 if (fcntl(ngx_processes[s].channel[0], F_SETFD, FD_CLOEXEC) == -1) {
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160 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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161 "fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
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162 name);
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163 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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164 return NGX_INVALID_PID;
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0
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165 }
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166
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167 if (fcntl(ngx_processes[s].channel[1], F_SETFD, FD_CLOEXEC) == -1) {
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168 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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169 "fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
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170 name);
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171 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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172 return NGX_INVALID_PID;
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0
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173 }
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174
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175 ngx_channel = ngx_processes[s].channel[1];
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176
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177 } else {
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178 ngx_processes[s].channel[0] = -1;
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179 ngx_processes[s].channel[1] = -1;
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180 }
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181
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182 ngx_process_slot = s;
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183
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184
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185 pid = fork();
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186
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187 switch (pid) {
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188
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189 case -1:
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190 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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191 "fork() failed while spawning \"%s\"", name);
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192 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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193 return NGX_INVALID_PID;
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0
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194
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195 case 0:
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196 ngx_pid = ngx_getpid();
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197 proc(cycle, data);
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198 break;
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199
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200 default:
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201 break;
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202 }
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203
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26
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204 ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "start %s %P", name, pid);
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0
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205
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206 ngx_processes[s].pid = pid;
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207 ngx_processes[s].exited = 0;
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208
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209 if (respawn >= 0) {
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210 return pid;
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211 }
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212
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213 ngx_processes[s].proc = proc;
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214 ngx_processes[s].data = data;
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215 ngx_processes[s].name = name;
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216 ngx_processes[s].exiting = 0;
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217
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218 switch (respawn) {
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219
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514
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220 case NGX_PROCESS_NORESPAWN:
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221 ngx_processes[s].respawn = 0;
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222 ngx_processes[s].just_spawn = 0;
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223 ngx_processes[s].detached = 0;
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224 break;
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225
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226 case NGX_PROCESS_JUST_SPAWN:
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227 ngx_processes[s].respawn = 0;
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228 ngx_processes[s].just_spawn = 1;
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229 ngx_processes[s].detached = 0;
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230 break;
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231
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0
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232 case NGX_PROCESS_RESPAWN:
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233 ngx_processes[s].respawn = 1;
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514
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234 ngx_processes[s].just_spawn = 0;
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0
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235 ngx_processes[s].detached = 0;
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236 break;
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237
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238 case NGX_PROCESS_JUST_RESPAWN:
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239 ngx_processes[s].respawn = 1;
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514
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240 ngx_processes[s].just_spawn = 1;
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0
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241 ngx_processes[s].detached = 0;
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242 break;
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243
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244 case NGX_PROCESS_DETACHED:
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245 ngx_processes[s].respawn = 0;
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514
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246 ngx_processes[s].just_spawn = 0;
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0
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247 ngx_processes[s].detached = 1;
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248 break;
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249 }
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250
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251 if (s == ngx_last_process) {
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252 ngx_last_process++;
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253 }
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254
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255 return pid;
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256 }
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257
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258
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64
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259 ngx_pid_t
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260 ngx_execute(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx)
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0
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261 {
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262 return ngx_spawn_process(cycle, ngx_execute_proc, ctx, ctx->name,
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263 NGX_PROCESS_DETACHED);
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264 }
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265
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266
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64
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267 static void
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268 ngx_execute_proc(ngx_cycle_t *cycle, void *data)
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0
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269 {
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270 ngx_exec_ctx_t *ctx = data;
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271
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272 if (execve(ctx->path, ctx->argv, ctx->envp) == -1) {
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273 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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274 "execve() failed while executing %s \"%s\"",
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275 ctx->name, ctx->path);
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276 }
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277
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278 exit(1);
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279 }
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280
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281
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88
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282 ngx_int_t
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283 ngx_init_signals(ngx_log_t *log)
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284 {
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285 ngx_signal_t *sig;
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286 struct sigaction sa;
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287
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288 for (sig = signals; sig->signo != 0; sig++) {
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289 ngx_memzero(&sa, sizeof(struct sigaction));
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290 sa.sa_handler = sig->handler;
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291 sigemptyset(&sa.sa_mask);
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292 if (sigaction(sig->signo, &sa, NULL) == -1) {
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293 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
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294 "sigaction(%s) failed", sig->signame);
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295 return NGX_ERROR;
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296 }
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297 }
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298
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299 return NGX_OK;
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300 }
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301
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302
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64
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303 void
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88
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304 ngx_signal_handler(int signo)
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305 {
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306 char *action;
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307 ngx_int_t ignore;
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308 ngx_err_t err;
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309 ngx_signal_t *sig;
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310
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311 ignore = 0;
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312
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313 err = ngx_errno;
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314
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315 for (sig = signals; sig->signo != 0; sig++) {
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316 if (sig->signo == signo) {
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317 break;
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318 }
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319 }
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320
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566
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321 ngx_time_sigsafe_update();
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88
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322
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323 action = "";
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324
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325 switch (ngx_process) {
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326
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327 case NGX_PROCESS_MASTER:
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328 case NGX_PROCESS_SINGLE:
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329 switch (signo) {
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330
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331 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
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332 ngx_quit = 1;
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333 action = ", shutting down";
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334 break;
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335
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336 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
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337 case SIGINT:
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338 ngx_terminate = 1;
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339 action = ", exiting";
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340 break;
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341
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342 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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634
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343 if (ngx_daemonized) {
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344 ngx_noaccept = 1;
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345 action = ", stop accepting connections";
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346 }
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88
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347 break;
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348
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349 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
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350 ngx_reconfigure = 1;
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351 action = ", reconfiguring";
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352 break;
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353
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354 case ngx_signal_value(NGX_REOPEN_SIGNAL):
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355 ngx_reopen = 1;
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356 action = ", reopening logs";
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357 break;
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358
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359 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
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360 if (getppid() > 1 || ngx_new_binary > 0) {
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361
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362 /*
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363 * Ignore the signal in the new binary if its parent is
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364 * not the init process, i.e. the old binary's process
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236
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365 * is still running. Or ignore the signal in the old binary's
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88
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366 * process if the new binary's process is already running.
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367 */
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368
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369 action = ", ignoring";
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370 ignore = 1;
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371 break;
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372 }
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373
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374 ngx_change_binary = 1;
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375 action = ", changing binary";
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376 break;
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377
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378 case SIGALRM:
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518
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379 ngx_sigalrm = 1;
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88
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380 break;
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381
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382 case SIGIO:
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383 ngx_sigio = 1;
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384 break;
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385
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386 case SIGCHLD:
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387 ngx_reap = 1;
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388 break;
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389 }
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390
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391 break;
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392
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393 case NGX_PROCESS_WORKER:
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552
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394 case NGX_PROCESS_HELPER:
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88
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395 switch (signo) {
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396
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397 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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634
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398 if (!ngx_daemonized) {
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399 break;
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400 }
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88
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401 ngx_debug_quit = 1;
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|
402 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
|
|
|
403 ngx_quit = 1;
|
|
|
404 action = ", shutting down";
|
|
|
405 break;
|
|
|
406
|
|
|
407 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
|
|
|
408 case SIGINT:
|
|
|
409 ngx_terminate = 1;
|
|
|
410 action = ", exiting";
|
|
|
411 break;
|
|
|
412
|
|
|
413 case ngx_signal_value(NGX_REOPEN_SIGNAL):
|
|
|
414 ngx_reopen = 1;
|
|
|
415 action = ", reopening logs";
|
|
|
416 break;
|
|
|
417
|
|
|
418 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
|
|
|
419 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
|
|
|
420 case SIGIO:
|
|
|
421 action = ", ignoring";
|
|
|
422 break;
|
|
|
423 }
|
|
|
424
|
|
|
425 break;
|
|
|
426 }
|
|
|
427
|
|
|
428 ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
|
|
|
429 "signal %d (%s) received%s", signo, sig->signame, action);
|
|
|
430
|
|
|
431 if (ignore) {
|
|
|
432 ngx_log_error(NGX_LOG_CRIT, ngx_cycle->log, 0,
|
|
|
433 "the changing binary signal is ignored: "
|
|
|
434 "you should shutdown or terminate "
|
|
|
435 "before either old or new binary's process");
|
|
|
436 }
|
|
|
437
|
|
|
438 if (signo == SIGCHLD) {
|
|
|
439 ngx_process_get_status();
|
|
|
440 }
|
|
|
441
|
|
|
442 ngx_set_errno(err);
|
|
|
443 }
|
|
|
444
|
|
|
445
|
|
|
446 static void
|
|
64
|
447 ngx_process_get_status(void)
|
|
0
|
448 {
|
|
|
449 int status;
|
|
|
450 char *process;
|
|
|
451 ngx_pid_t pid;
|
|
|
452 ngx_err_t err;
|
|
|
453 ngx_int_t i;
|
|
|
454 ngx_uint_t one;
|
|
26
|
455
|
|
0
|
456 one = 0;
|
|
|
457
|
|
|
458 for ( ;; ) {
|
|
|
459 pid = waitpid(-1, &status, WNOHANG);
|
|
|
460
|
|
|
461 if (pid == 0) {
|
|
|
462 return;
|
|
|
463 }
|
|
|
464
|
|
|
465 if (pid == -1) {
|
|
|
466 err = ngx_errno;
|
|
|
467
|
|
|
468 if (err == NGX_EINTR) {
|
|
|
469 continue;
|
|
|
470 }
|
|
|
471
|
|
|
472 if (err == NGX_ECHILD && one) {
|
|
|
473 return;
|
|
|
474 }
|
|
|
475
|
|
270
|
476 #if (NGX_SOLARIS || NGX_FREEBSD)
|
|
2
|
477
|
|
|
478 /*
|
|
|
479 * Solaris always calls the signal handler for each exited process
|
|
270
|
480 * despite waitpid() may be already called for this process.
|
|
|
481 *
|
|
|
482 * When several processes exit at the same time FreeBSD may
|
|
|
483 * erroneously call the signal handler for exited process
|
|
372
|
484 * despite waitpid() may be already called for this process.
|
|
2
|
485 */
|
|
|
486
|
|
|
487 if (err == NGX_ECHILD) {
|
|
604
|
488 ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, err,
|
|
|
489 "waitpid() failed");
|
|
112
|
490 return;
|
|
2
|
491 }
|
|
|
492
|
|
|
493 #endif
|
|
|
494
|
|
604
|
495 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, err,
|
|
|
496 "waitpid() failed");
|
|
0
|
497 return;
|
|
|
498 }
|
|
|
499
|
|
|
500
|
|
|
501 one = 1;
|
|
|
502 process = "unknown process";
|
|
|
503
|
|
|
504 for (i = 0; i < ngx_last_process; i++) {
|
|
|
505 if (ngx_processes[i].pid == pid) {
|
|
|
506 ngx_processes[i].status = status;
|
|
|
507 ngx_processes[i].exited = 1;
|
|
|
508 process = ngx_processes[i].name;
|
|
|
509 break;
|
|
|
510 }
|
|
|
511 }
|
|
|
512
|
|
|
513 if (WTERMSIG(status)) {
|
|
444
|
514 #ifdef WCOREDUMP
|
|
0
|
515 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
10
|
516 "%s %P exited on signal %d%s",
|
|
0
|
517 process, pid, WTERMSIG(status),
|
|
|
518 WCOREDUMP(status) ? " (core dumped)" : "");
|
|
444
|
519 #else
|
|
|
520 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
|
521 "%s %P exited on signal %d",
|
|
|
522 process, pid, WTERMSIG(status));
|
|
|
523 #endif
|
|
0
|
524
|
|
|
525 } else {
|
|
26
|
526 ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
|
|
10
|
527 "%s %P exited with code %d",
|
|
0
|
528 process, pid, WEXITSTATUS(status));
|
|
|
529 }
|
|
|
530
|
|
|
531 if (WEXITSTATUS(status) == 2 && ngx_processes[i].respawn) {
|
|
|
532 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
372
|
533 "%s %P exited with fatal code %d "
|
|
640
|
534 "and cannot be respawned",
|
|
372
|
535 process, pid, WEXITSTATUS(status));
|
|
0
|
536 ngx_processes[i].respawn = 0;
|
|
|
537 }
|
|
650
|
538
|
|
|
539 ngx_unlock_mutexes(pid);
|
|
|
540 }
|
|
|
541 }
|
|
|
542
|
|
|
543
|
|
|
544 static void
|
|
|
545 ngx_unlock_mutexes(ngx_pid_t pid)
|
|
|
546 {
|
|
|
547 ngx_uint_t i;
|
|
|
548 ngx_shm_zone_t *shm_zone;
|
|
|
549 ngx_list_part_t *part;
|
|
|
550 ngx_slab_pool_t *sp;
|
|
|
551
|
|
|
552 /*
|
|
|
553 * unlock the accept mutex if the abnormally exited process
|
|
|
554 * held it
|
|
|
555 */
|
|
|
556
|
|
|
557 if (ngx_accept_mutex_ptr) {
|
|
|
558 (void) ngx_shmtx_force_unlock(&ngx_accept_mutex, pid);
|
|
|
559 }
|
|
|
560
|
|
|
561 /*
|
|
|
562 * unlock shared memory mutexes if held by the abnormally exited
|
|
|
563 * process
|
|
|
564 */
|
|
|
565
|
|
|
566 part = (ngx_list_part_t *) &ngx_cycle->shared_memory.part;
|
|
|
567 shm_zone = part->elts;
|
|
|
568
|
|
|
569 for (i = 0; /* void */ ; i++) {
|
|
|
570
|
|
|
571 if (i >= part->nelts) {
|
|
|
572 if (part->next == NULL) {
|
|
|
573 break;
|
|
|
574 }
|
|
|
575 part = part->next;
|
|
|
576 shm_zone = part->elts;
|
|
|
577 i = 0;
|
|
|
578 }
|
|
|
579
|
|
|
580 sp = (ngx_slab_pool_t *) shm_zone[i].shm.addr;
|
|
|
581
|
|
|
582 if (ngx_shmtx_force_unlock(&sp->mutex, pid)) {
|
|
|
583 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
|
584 "shared memory zone \"%V\" was locked by %P",
|
|
|
585 &shm_zone[i].shm.name, pid);
|
|
|
586 }
|
|
0
|
587 }
|
|
|
588 }
|
|
10
|
589
|
|
|
590
|
|
64
|
591 void
|
|
|
592 ngx_debug_point(void)
|
|
10
|
593 {
|
|
|
594 ngx_core_conf_t *ccf;
|
|
|
595
|
|
|
596 ccf = (ngx_core_conf_t *) ngx_get_conf(ngx_cycle->conf_ctx,
|
|
|
597 ngx_core_module);
|
|
|
598
|
|
|
599 switch (ccf->debug_points) {
|
|
|
600
|
|
|
601 case NGX_DEBUG_POINTS_STOP:
|
|
|
602 raise(SIGSTOP);
|
|
|
603 break;
|
|
|
604
|
|
|
605 case NGX_DEBUG_POINTS_ABORT:
|
|
112
|
606 ngx_abort();
|
|
10
|
607 }
|
|
|
608 }
|
|
482
|
609
|
|
|
610
|
|
|
611 ngx_int_t
|
|
|
612 ngx_os_signal_process(ngx_cycle_t *cycle, char *name, ngx_int_t pid)
|
|
|
613 {
|
|
|
614 ngx_signal_t *sig;
|
|
|
615
|
|
|
616 for (sig = signals; sig->signo != 0; sig++) {
|
|
|
617 if (ngx_strcmp(name, sig->name) == 0) {
|
|
|
618 if (kill(pid, sig->signo) != -1) {
|
|
|
619 return 0;
|
|
|
620 }
|
|
|
621
|
|
|
622 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
623 "kill(%P, %d) failed", pid, sig->signo);
|
|
|
624 }
|
|
|
625 }
|
|
|
626
|
|
|
627 return 1;
|
|
|
628 }
|
