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annotate src/os/unix/ngx_daemon.c @ 5992:174512857ccf

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Cache: do not inherit last_modified and etag from stale response. When replacing a stale cache entry, its last_modified and etag could be inherited from the old entry if the response code is not 200 or 206. Moreover, etag could be inherited with any response code if it's missing in the new response. As a result, the cache entry is left with invalid last_modified or etag which could lead to broken revalidation. For example, when a file is deleted from backend, its last_modified is copied to the new 404 cache entry and is used later for revalidation. Once the old file appears again with its original timestamp, revalidation succeeds and the cached 404 response is sent to client instead of the file. The problem appeared with etags in 44b9ab7752e3 (1.7.3) and affected last_modified in 1573fc7875fa (1.7.9).
author Roman Arutyunyan <arut@nginx.com>
date Mon, 02 Mar 2015 19:47:13 +0300
parents b1ba43f905f8
children 8b84d60ef13d
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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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5 */
da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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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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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
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2a0540287298 nginx-0.0.2-2004-02-03-19:43:54 import
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29 ngx_pid = ngx_getpid();
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30
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31 if (setsid() == -1) {
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32 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "setsid() failed");
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33 return NGX_ERROR;
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34 }
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35
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
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36 umask(0);
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37
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
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38 fd = open("/dev/null", O_RDWR);
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39 if (fd == -1) {
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40 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
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41 "open(\"/dev/null\") failed");
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42 return NGX_ERROR;
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43 }
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3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
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45 if (dup2(fd, STDIN_FILENO) == -1) {
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46 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDIN) failed");
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47 return NGX_ERROR;
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48 }
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49
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
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50 if (dup2(fd, STDOUT_FILENO) == -1) {
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51 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDOUT) failed");
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52 return NGX_ERROR;
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53 }
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54
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00bee6e7b485 nginx-0.0.1-2003-06-15-22:32:13 import
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55 #if 0
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56 if (dup2(fd, STDERR_FILENO) == -1) {
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57 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDERR) failed");
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58 return NGX_ERROR;
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59 }
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00bee6e7b485 nginx-0.0.1-2003-06-15-22:32:13 import
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60 #endif
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61
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
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62 if (fd > STDERR_FILENO) {
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63 if (close(fd) == -1) {
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64 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "close() failed");
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65 return NGX_ERROR;
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66 }
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67 }
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68
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69 return NGX_OK;
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70 }