Mercurial > hg > nginx
annotate src/os/unix/ngx_daemon.c @ 9331:dbf76fdd109f default tip
release-1.27.4 tag
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Tue, 03 Sep 2024 13:11:25 +0300 |
parents | 3d455e37abf8 |
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rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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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 |
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12 static ngx_fd_t ngx_daemon_fd = NGX_INVALID_FILE; |
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13 |
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14 |
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15 ngx_int_t |
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16 ngx_daemon(ngx_log_t *log) |
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17 { |
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18 u_char buf[1]; |
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19 ssize_t n; |
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20 ngx_fd_t fd, pp[2]; |
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21 |
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22 if (pipe(pp) == -1) { |
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23 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "pipe() failed"); |
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24 return NGX_ERROR; |
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25 } |
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26 |
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27 switch (fork()) { |
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28 case -1: |
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29 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "fork() failed"); |
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30 return NGX_ERROR; |
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31 |
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32 case 0: |
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33 if (close(pp[0]) == -1) { |
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34 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "close() pipe failed"); |
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35 return NGX_ERROR; |
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36 } |
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37 |
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38 ngx_daemon_fd = pp[1]; |
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39 break; |
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40 |
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41 default: |
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42 if (close(pp[1]) == -1) { |
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43 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "close() pipe failed"); |
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44 return NGX_ERROR; |
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45 } |
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46 |
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47 n = read(pp[0], buf, 1); |
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48 |
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49 if (n == 0) { |
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50 /* child exited */ |
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51 return NGX_ERROR; |
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52 } |
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53 |
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54 if (n != 1) { |
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55 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, |
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56 "read() pipe failed"); |
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57 return NGX_ERROR; |
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58 } |
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59 |
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60 if (close(pp[0]) == -1) { |
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61 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "close() pipe failed"); |
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62 return NGX_ERROR; |
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63 } |
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64 |
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65 exit(0); |
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66 } |
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67 |
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68 ngx_parent = ngx_pid; |
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69 ngx_pid = ngx_getpid(); |
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70 |
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71 if (setsid() == -1) { |
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72 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "setsid() failed"); |
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73 return NGX_ERROR; |
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74 } |
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75 |
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76 umask(0); |
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77 |
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78 fd = open("/dev/null", O_RDWR); |
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79 if (fd == -1) { |
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80 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, |
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81 "open(\"/dev/null\") failed"); |
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82 return NGX_ERROR; |
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83 } |
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84 |
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85 if (dup2(fd, STDIN_FILENO) == -1) { |
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86 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDIN) failed"); |
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87 return NGX_ERROR; |
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88 } |
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89 |
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90 if (dup2(fd, STDOUT_FILENO) == -1) { |
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91 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDOUT) failed"); |
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92 return NGX_ERROR; |
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93 } |
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94 |
105
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95 #if 0 |
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96 if (dup2(fd, STDERR_FILENO) == -1) { |
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97 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDERR) failed"); |
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98 return NGX_ERROR; |
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99 } |
105
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100 #endif |
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101 |
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102 if (fd > STDERR_FILENO) { |
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103 if (close(fd) == -1) { |
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104 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "close() failed"); |
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105 return NGX_ERROR; |
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106 } |
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107 } |
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108 |
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109 return NGX_OK; |
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110 } |
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111 |
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112 |
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113 ngx_int_t |
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114 ngx_daemon_sync(ngx_log_t *log) |
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115 { |
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116 if (ngx_daemon_fd == NGX_INVALID_FILE) { |
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117 return NGX_OK; |
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118 } |
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119 |
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120 if (write(ngx_daemon_fd, "", 1) != 1) { |
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121 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "write() pipe failed"); |
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122 return NGX_ERROR; |
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123 } |
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124 |
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125 if (close(ngx_daemon_fd) == -1) { |
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126 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "close() pipe failed"); |
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127 return NGX_ERROR; |
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128 } |
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129 |
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130 ngx_daemon_fd = NGX_INVALID_FILE; |
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131 |
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132 return NGX_OK; |
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133 } |