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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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660
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4 * Copyright (C) Nginx, Inc.
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0
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11 #include <ngx_channel.h>
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12
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13
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88
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14 typedef struct {
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586
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15 int signo;
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16 char *signame;
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17 char *name;
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18 void (*handler)(int signo);
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88
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19 } ngx_signal_t;
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20
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21
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22
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0
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23 static void ngx_execute_proc(ngx_cycle_t *cycle, void *data);
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88
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24 static void ngx_signal_handler(int signo);
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25 static void ngx_process_get_status(void);
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650
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26 static void ngx_unlock_mutexes(ngx_pid_t pid);
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0
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27
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2
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28
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29 int ngx_argc;
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30 char **ngx_argv;
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31 char **ngx_os_argv;
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32
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33 ngx_int_t ngx_process_slot;
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34 ngx_socket_t ngx_channel;
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35 ngx_int_t ngx_last_process;
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36 ngx_process_t ngx_processes[NGX_MAX_PROCESSES];
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0
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37
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38
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88
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39 ngx_signal_t signals[] = {
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40 { ngx_signal_value(NGX_RECONFIGURE_SIGNAL),
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41 "SIG" ngx_value(NGX_RECONFIGURE_SIGNAL),
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482
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42 "reload",
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88
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43 ngx_signal_handler },
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44
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45 { ngx_signal_value(NGX_REOPEN_SIGNAL),
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46 "SIG" ngx_value(NGX_REOPEN_SIGNAL),
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482
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47 "reopen",
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88
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48 ngx_signal_handler },
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49
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50 { ngx_signal_value(NGX_NOACCEPT_SIGNAL),
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51 "SIG" ngx_value(NGX_NOACCEPT_SIGNAL),
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482
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52 "",
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88
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53 ngx_signal_handler },
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54
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55 { ngx_signal_value(NGX_TERMINATE_SIGNAL),
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56 "SIG" ngx_value(NGX_TERMINATE_SIGNAL),
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482
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57 "stop",
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88
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58 ngx_signal_handler },
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59
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60 { ngx_signal_value(NGX_SHUTDOWN_SIGNAL),
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61 "SIG" ngx_value(NGX_SHUTDOWN_SIGNAL),
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482
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62 "quit",
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88
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63 ngx_signal_handler },
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64
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65 { ngx_signal_value(NGX_CHANGEBIN_SIGNAL),
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66 "SIG" ngx_value(NGX_CHANGEBIN_SIGNAL),
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482
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67 "",
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88
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68 ngx_signal_handler },
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69
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482
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70 { SIGALRM, "SIGALRM", "", ngx_signal_handler },
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88
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71
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482
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72 { SIGINT, "SIGINT", "", ngx_signal_handler },
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88
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73
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482
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74 { SIGIO, "SIGIO", "", ngx_signal_handler },
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88
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75
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482
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76 { SIGCHLD, "SIGCHLD", "", ngx_signal_handler },
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88
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77
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518
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78 { SIGSYS, "SIGSYS, SIG_IGN", "", SIG_IGN },
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79
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482
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80 { SIGPIPE, "SIGPIPE, SIG_IGN", "", SIG_IGN },
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88
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81
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482
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82 { 0, NULL, "", NULL }
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88
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83 };
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84
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85
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64
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86 ngx_pid_t
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87 ngx_spawn_process(ngx_cycle_t *cycle, ngx_spawn_proc_pt proc, void *data,
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88 char *name, ngx_int_t respawn)
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0
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89 {
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90 u_long on;
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91 ngx_pid_t pid;
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92 ngx_int_t s;
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93
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94 if (respawn >= 0) {
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95 s = respawn;
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96
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97 } else {
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98 for (s = 0; s < ngx_last_process; s++) {
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99 if (ngx_processes[s].pid == -1) {
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100 break;
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101 }
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102 }
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103
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104 if (s == NGX_MAX_PROCESSES) {
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105 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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106 "no more than %d processes can be spawned",
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107 NGX_MAX_PROCESSES);
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92
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108 return NGX_INVALID_PID;
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0
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109 }
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110 }
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111
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112
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113 if (respawn != NGX_PROCESS_DETACHED) {
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114
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115 /* Solaris 9 still has no AF_LOCAL */
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116
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117 if (socketpair(AF_UNIX, SOCK_STREAM, 0, ngx_processes[s].channel) == -1)
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118 {
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119 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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120 "socketpair() failed while spawning \"%s\"", name);
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92
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121 return NGX_INVALID_PID;
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0
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122 }
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123
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124 ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
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125 "channel %d:%d",
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126 ngx_processes[s].channel[0],
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127 ngx_processes[s].channel[1]);
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128
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129 if (ngx_nonblocking(ngx_processes[s].channel[0]) == -1) {
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130 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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131 ngx_nonblocking_n " failed while spawning \"%s\"",
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132 name);
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133 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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134 return NGX_INVALID_PID;
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0
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135 }
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136
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137 if (ngx_nonblocking(ngx_processes[s].channel[1]) == -1) {
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138 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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139 ngx_nonblocking_n " failed while spawning \"%s\"",
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140 name);
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141 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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142 return NGX_INVALID_PID;
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0
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143 }
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144
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145 on = 1;
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146 if (ioctl(ngx_processes[s].channel[0], FIOASYNC, &on) == -1) {
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147 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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148 "ioctl(FIOASYNC) failed while spawning \"%s\"", name);
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149 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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150 return NGX_INVALID_PID;
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0
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151 }
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152
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153 if (fcntl(ngx_processes[s].channel[0], F_SETOWN, ngx_pid) == -1) {
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154 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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155 "fcntl(F_SETOWN) failed while spawning \"%s\"", name);
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156 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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157 return NGX_INVALID_PID;
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0
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158 }
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159
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160 if (fcntl(ngx_processes[s].channel[0], F_SETFD, FD_CLOEXEC) == -1) {
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161 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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162 "fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
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163 name);
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164 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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165 return NGX_INVALID_PID;
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0
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166 }
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167
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168 if (fcntl(ngx_processes[s].channel[1], F_SETFD, FD_CLOEXEC) == -1) {
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169 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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170 "fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
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171 name);
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172 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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173 return NGX_INVALID_PID;
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0
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174 }
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175
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176 ngx_channel = ngx_processes[s].channel[1];
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177
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178 } else {
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179 ngx_processes[s].channel[0] = -1;
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180 ngx_processes[s].channel[1] = -1;
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181 }
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182
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183 ngx_process_slot = s;
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184
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185
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186 pid = fork();
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187
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188 switch (pid) {
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189
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190 case -1:
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191 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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192 "fork() failed while spawning \"%s\"", name);
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193 ngx_close_channel(ngx_processes[s].channel, cycle->log);
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92
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194 return NGX_INVALID_PID;
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0
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195
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196 case 0:
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197 ngx_pid = ngx_getpid();
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198 proc(cycle, data);
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199 break;
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200
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201 default:
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202 break;
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203 }
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204
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26
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205 ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "start %s %P", name, pid);
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0
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206
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207 ngx_processes[s].pid = pid;
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208 ngx_processes[s].exited = 0;
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209
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210 if (respawn >= 0) {
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211 return pid;
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212 }
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213
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214 ngx_processes[s].proc = proc;
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215 ngx_processes[s].data = data;
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216 ngx_processes[s].name = name;
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217 ngx_processes[s].exiting = 0;
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218
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219 switch (respawn) {
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220
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514
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221 case NGX_PROCESS_NORESPAWN:
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222 ngx_processes[s].respawn = 0;
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223 ngx_processes[s].just_spawn = 0;
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224 ngx_processes[s].detached = 0;
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225 break;
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226
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227 case NGX_PROCESS_JUST_SPAWN:
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228 ngx_processes[s].respawn = 0;
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229 ngx_processes[s].just_spawn = 1;
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230 ngx_processes[s].detached = 0;
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231 break;
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232
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0
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233 case NGX_PROCESS_RESPAWN:
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234 ngx_processes[s].respawn = 1;
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514
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235 ngx_processes[s].just_spawn = 0;
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0
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236 ngx_processes[s].detached = 0;
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237 break;
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238
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239 case NGX_PROCESS_JUST_RESPAWN:
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240 ngx_processes[s].respawn = 1;
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514
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241 ngx_processes[s].just_spawn = 1;
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0
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242 ngx_processes[s].detached = 0;
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243 break;
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244
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245 case NGX_PROCESS_DETACHED:
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246 ngx_processes[s].respawn = 0;
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514
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247 ngx_processes[s].just_spawn = 0;
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0
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248 ngx_processes[s].detached = 1;
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249 break;
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250 }
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251
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252 if (s == ngx_last_process) {
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253 ngx_last_process++;
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254 }
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255
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256 return pid;
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257 }
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258
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259
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64
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260 ngx_pid_t
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261 ngx_execute(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx)
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0
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262 {
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263 return ngx_spawn_process(cycle, ngx_execute_proc, ctx, ctx->name,
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264 NGX_PROCESS_DETACHED);
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265 }
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266
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267
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64
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268 static void
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269 ngx_execute_proc(ngx_cycle_t *cycle, void *data)
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0
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270 {
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271 ngx_exec_ctx_t *ctx = data;
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272
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273 if (execve(ctx->path, ctx->argv, ctx->envp) == -1) {
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274 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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275 "execve() failed while executing %s \"%s\"",
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276 ctx->name, ctx->path);
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277 }
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278
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279 exit(1);
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280 }
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281
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282
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88
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283 ngx_int_t
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284 ngx_init_signals(ngx_log_t *log)
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285 {
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286 ngx_signal_t *sig;
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287 struct sigaction sa;
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288
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289 for (sig = signals; sig->signo != 0; sig++) {
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290 ngx_memzero(&sa, sizeof(struct sigaction));
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291 sa.sa_handler = sig->handler;
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292 sigemptyset(&sa.sa_mask);
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293 if (sigaction(sig->signo, &sa, NULL) == -1) {
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294 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
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295 "sigaction(%s) failed", sig->signame);
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296 return NGX_ERROR;
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297 }
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298 }
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299
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300 return NGX_OK;
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301 }
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302
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303
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64
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304 void
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88
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305 ngx_signal_handler(int signo)
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306 {
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307 char *action;
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308 ngx_int_t ignore;
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309 ngx_err_t err;
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310 ngx_signal_t *sig;
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311
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312 ignore = 0;
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313
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314 err = ngx_errno;
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315
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316 for (sig = signals; sig->signo != 0; sig++) {
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317 if (sig->signo == signo) {
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318 break;
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319 }
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320 }
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321
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566
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322 ngx_time_sigsafe_update();
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88
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323
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324 action = "";
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325
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326 switch (ngx_process) {
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327
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328 case NGX_PROCESS_MASTER:
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329 case NGX_PROCESS_SINGLE:
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330 switch (signo) {
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331
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332 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
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333 ngx_quit = 1;
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334 action = ", shutting down";
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335 break;
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336
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337 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
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338 case SIGINT:
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339 ngx_terminate = 1;
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340 action = ", exiting";
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341 break;
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342
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343 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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634
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344 if (ngx_daemonized) {
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345 ngx_noaccept = 1;
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346 action = ", stop accepting connections";
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347 }
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88
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348 break;
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349
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350 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
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351 ngx_reconfigure = 1;
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352 action = ", reconfiguring";
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353 break;
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354
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355 case ngx_signal_value(NGX_REOPEN_SIGNAL):
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356 ngx_reopen = 1;
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357 action = ", reopening logs";
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358 break;
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359
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360 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
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361 if (getppid() > 1 || ngx_new_binary > 0) {
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362
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363 /*
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364 * Ignore the signal in the new binary if its parent is
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365 * not the init process, i.e. the old binary's process
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236
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366 * is still running. Or ignore the signal in the old binary's
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88
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367 * process if the new binary's process is already running.
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368 */
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369
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370 action = ", ignoring";
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371 ignore = 1;
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372 break;
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373 }
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374
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375 ngx_change_binary = 1;
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376 action = ", changing binary";
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377 break;
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378
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379 case SIGALRM:
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518
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380 ngx_sigalrm = 1;
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88
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381 break;
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382
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383 case SIGIO:
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384 ngx_sigio = 1;
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385 break;
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386
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387 case SIGCHLD:
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388 ngx_reap = 1;
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389 break;
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390 }
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391
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392 break;
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393
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394 case NGX_PROCESS_WORKER:
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552
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395 case NGX_PROCESS_HELPER:
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88
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396 switch (signo) {
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397
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398 case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
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634
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399 if (!ngx_daemonized) {
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400 break;
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401 }
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88
|
402 ngx_debug_quit = 1;
|
|
|
403 case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
|
|
|
404 ngx_quit = 1;
|
|
|
405 action = ", shutting down";
|
|
|
406 break;
|
|
|
407
|
|
|
408 case ngx_signal_value(NGX_TERMINATE_SIGNAL):
|
|
|
409 case SIGINT:
|
|
|
410 ngx_terminate = 1;
|
|
|
411 action = ", exiting";
|
|
|
412 break;
|
|
|
413
|
|
|
414 case ngx_signal_value(NGX_REOPEN_SIGNAL):
|
|
|
415 ngx_reopen = 1;
|
|
|
416 action = ", reopening logs";
|
|
|
417 break;
|
|
|
418
|
|
|
419 case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
|
|
|
420 case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
|
|
|
421 case SIGIO:
|
|
|
422 action = ", ignoring";
|
|
|
423 break;
|
|
|
424 }
|
|
|
425
|
|
|
426 break;
|
|
|
427 }
|
|
|
428
|
|
|
429 ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
|
|
|
430 "signal %d (%s) received%s", signo, sig->signame, action);
|
|
|
431
|
|
|
432 if (ignore) {
|
|
|
433 ngx_log_error(NGX_LOG_CRIT, ngx_cycle->log, 0,
|
|
|
434 "the changing binary signal is ignored: "
|
|
|
435 "you should shutdown or terminate "
|
|
|
436 "before either old or new binary's process");
|
|
|
437 }
|
|
|
438
|
|
|
439 if (signo == SIGCHLD) {
|
|
|
440 ngx_process_get_status();
|
|
|
441 }
|
|
|
442
|
|
|
443 ngx_set_errno(err);
|
|
|
444 }
|
|
|
445
|
|
|
446
|
|
|
447 static void
|
|
64
|
448 ngx_process_get_status(void)
|
|
0
|
449 {
|
|
|
450 int status;
|
|
|
451 char *process;
|
|
|
452 ngx_pid_t pid;
|
|
|
453 ngx_err_t err;
|
|
|
454 ngx_int_t i;
|
|
|
455 ngx_uint_t one;
|
|
26
|
456
|
|
0
|
457 one = 0;
|
|
|
458
|
|
|
459 for ( ;; ) {
|
|
|
460 pid = waitpid(-1, &status, WNOHANG);
|
|
|
461
|
|
|
462 if (pid == 0) {
|
|
|
463 return;
|
|
|
464 }
|
|
|
465
|
|
|
466 if (pid == -1) {
|
|
|
467 err = ngx_errno;
|
|
|
468
|
|
|
469 if (err == NGX_EINTR) {
|
|
|
470 continue;
|
|
|
471 }
|
|
|
472
|
|
|
473 if (err == NGX_ECHILD && one) {
|
|
|
474 return;
|
|
|
475 }
|
|
|
476
|
|
2
|
477 /*
|
|
|
478 * Solaris always calls the signal handler for each exited process
|
|
270
|
479 * despite waitpid() may be already called for this process.
|
|
|
480 *
|
|
|
481 * When several processes exit at the same time FreeBSD may
|
|
|
482 * erroneously call the signal handler for exited process
|
|
372
|
483 * despite waitpid() may be already called for this process.
|
|
2
|
484 */
|
|
|
485
|
|
|
486 if (err == NGX_ECHILD) {
|
|
604
|
487 ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, err,
|
|
|
488 "waitpid() failed");
|
|
112
|
489 return;
|
|
2
|
490 }
|
|
|
491
|
|
604
|
492 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, err,
|
|
|
493 "waitpid() failed");
|
|
0
|
494 return;
|
|
|
495 }
|
|
|
496
|
|
|
497
|
|
|
498 one = 1;
|
|
|
499 process = "unknown process";
|
|
|
500
|
|
|
501 for (i = 0; i < ngx_last_process; i++) {
|
|
|
502 if (ngx_processes[i].pid == pid) {
|
|
|
503 ngx_processes[i].status = status;
|
|
|
504 ngx_processes[i].exited = 1;
|
|
|
505 process = ngx_processes[i].name;
|
|
|
506 break;
|
|
|
507 }
|
|
|
508 }
|
|
|
509
|
|
|
510 if (WTERMSIG(status)) {
|
|
444
|
511 #ifdef WCOREDUMP
|
|
0
|
512 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
10
|
513 "%s %P exited on signal %d%s",
|
|
0
|
514 process, pid, WTERMSIG(status),
|
|
|
515 WCOREDUMP(status) ? " (core dumped)" : "");
|
|
444
|
516 #else
|
|
|
517 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
|
518 "%s %P exited on signal %d",
|
|
|
519 process, pid, WTERMSIG(status));
|
|
|
520 #endif
|
|
0
|
521
|
|
|
522 } else {
|
|
26
|
523 ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
|
|
10
|
524 "%s %P exited with code %d",
|
|
0
|
525 process, pid, WEXITSTATUS(status));
|
|
|
526 }
|
|
|
527
|
|
|
528 if (WEXITSTATUS(status) == 2 && ngx_processes[i].respawn) {
|
|
|
529 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
372
|
530 "%s %P exited with fatal code %d "
|
|
640
|
531 "and cannot be respawned",
|
|
372
|
532 process, pid, WEXITSTATUS(status));
|
|
0
|
533 ngx_processes[i].respawn = 0;
|
|
|
534 }
|
|
650
|
535
|
|
|
536 ngx_unlock_mutexes(pid);
|
|
|
537 }
|
|
|
538 }
|
|
|
539
|
|
|
540
|
|
|
541 static void
|
|
|
542 ngx_unlock_mutexes(ngx_pid_t pid)
|
|
666
|
543 {
|
|
650
|
544 ngx_uint_t i;
|
|
|
545 ngx_shm_zone_t *shm_zone;
|
|
|
546 ngx_list_part_t *part;
|
|
|
547 ngx_slab_pool_t *sp;
|
|
|
548
|
|
|
549 /*
|
|
|
550 * unlock the accept mutex if the abnormally exited process
|
|
|
551 * held it
|
|
|
552 */
|
|
|
553
|
|
|
554 if (ngx_accept_mutex_ptr) {
|
|
|
555 (void) ngx_shmtx_force_unlock(&ngx_accept_mutex, pid);
|
|
|
556 }
|
|
|
557
|
|
|
558 /*
|
|
|
559 * unlock shared memory mutexes if held by the abnormally exited
|
|
|
560 * process
|
|
|
561 */
|
|
|
562
|
|
|
563 part = (ngx_list_part_t *) &ngx_cycle->shared_memory.part;
|
|
|
564 shm_zone = part->elts;
|
|
|
565
|
|
|
566 for (i = 0; /* void */ ; i++) {
|
|
|
567
|
|
|
568 if (i >= part->nelts) {
|
|
|
569 if (part->next == NULL) {
|
|
|
570 break;
|
|
|
571 }
|
|
|
572 part = part->next;
|
|
|
573 shm_zone = part->elts;
|
|
|
574 i = 0;
|
|
|
575 }
|
|
|
576
|
|
|
577 sp = (ngx_slab_pool_t *) shm_zone[i].shm.addr;
|
|
|
578
|
|
|
579 if (ngx_shmtx_force_unlock(&sp->mutex, pid)) {
|
|
|
580 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
|
|
|
581 "shared memory zone \"%V\" was locked by %P",
|
|
|
582 &shm_zone[i].shm.name, pid);
|
|
|
583 }
|
|
0
|
584 }
|
|
|
585 }
|
|
10
|
586
|
|
|
587
|
|
64
|
588 void
|
|
|
589 ngx_debug_point(void)
|
|
10
|
590 {
|
|
|
591 ngx_core_conf_t *ccf;
|
|
|
592
|
|
|
593 ccf = (ngx_core_conf_t *) ngx_get_conf(ngx_cycle->conf_ctx,
|
|
|
594 ngx_core_module);
|
|
|
595
|
|
|
596 switch (ccf->debug_points) {
|
|
|
597
|
|
|
598 case NGX_DEBUG_POINTS_STOP:
|
|
|
599 raise(SIGSTOP);
|
|
|
600 break;
|
|
|
601
|
|
|
602 case NGX_DEBUG_POINTS_ABORT:
|
|
112
|
603 ngx_abort();
|
|
10
|
604 }
|
|
|
605 }
|
|
482
|
606
|
|
|
607
|
|
|
608 ngx_int_t
|
|
|
609 ngx_os_signal_process(ngx_cycle_t *cycle, char *name, ngx_int_t pid)
|
|
|
610 {
|
|
|
611 ngx_signal_t *sig;
|
|
|
612
|
|
|
613 for (sig = signals; sig->signo != 0; sig++) {
|
|
|
614 if (ngx_strcmp(name, sig->name) == 0) {
|
|
|
615 if (kill(pid, sig->signo) != -1) {
|
|
|
616 return 0;
|
|
|
617 }
|
|
|
618
|
|
|
619 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
620 "kill(%P, %d) failed", pid, sig->signo);
|
|
|
621 }
|
|
|
622 }
|
|
|
623
|
|
|
624 return 1;
|
|
|
625 }
|
