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annotate src/os/unix/ngx_daemon.c @ 7162:8b84d60ef13d

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Fixed "changing binary" when reaper is not init. On some systems, it's possible that reaper of orphaned processes is set to something other than "init" process. On such systems, the changing binary procedure did not work. The fix is to check if PPID has changed, instead of assuming it's always 1 for orphaned processes.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 28 Nov 2017 12:00:24 +0300
parents b1ba43f905f8
children 3d455e37abf8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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2 /*
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42d11f017717 nginx-0.1.0-2004-09-29-20:00:49 import; remove years from copyright
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3 * Copyright (C) Igor Sysoev
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d620f497c50f Copyright updated.
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4 * Copyright (C) Nginx, Inc.
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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5 */
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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11
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12 ngx_int_t
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13 ngx_daemon(ngx_log_t *log)
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14 {
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15 int fd;
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16
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17 switch (fork()) {
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18 case -1:
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71ce40b3c37b nginx-0.0.1-2003-11-19-19:26:41 import
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19 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "fork() failed");
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20 return NGX_ERROR;
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21
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22 case 0:
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23 break;
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24
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25 default:
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26 exit(0);
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27 }
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28
7162
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29 ngx_parent = ngx_pid;
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2a0540287298 nginx-0.0.2-2004-02-03-19:43:54 import
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30 ngx_pid = ngx_getpid();
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31
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32 if (setsid() == -1) {
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33 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "setsid() failed");
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34 return NGX_ERROR;
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35 }
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36
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37 umask(0);
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38
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
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39 fd = open("/dev/null", O_RDWR);
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40 if (fd == -1) {
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41 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
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42 "open(\"/dev/null\") failed");
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43 return NGX_ERROR;
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44 }
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45
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46 if (dup2(fd, STDIN_FILENO) == -1) {
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47 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDIN) failed");
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48 return NGX_ERROR;
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49 }
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50
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51 if (dup2(fd, STDOUT_FILENO) == -1) {
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52 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDOUT) failed");
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53 return NGX_ERROR;
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54 }
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55
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56 #if 0
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57 if (dup2(fd, STDERR_FILENO) == -1) {
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58 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDERR) failed");
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59 return NGX_ERROR;
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60 }
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61 #endif
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62
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63 if (fd > STDERR_FILENO) {
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64 if (close(fd) == -1) {
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65 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "close() failed");
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66 return NGX_ERROR;
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67 }
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68 }
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69
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70 return NGX_OK;
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71 }