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annotate src/os/unix/ngx_daemon.c @ 5356:acd51b0f6fd4

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Disable symlinks: use O_PATH to open path components. It was introduced in Linux 2.6.39, glibc 2.14 and allows to obtain file descriptors without actually opening files. Thus made it possible to traverse path with openat() syscalls without the need to have read permissions for path components. It is effectively emulates O_SEARCH which is missing on Linux. O_PATH is used in combination with O_RDONLY. The last one is ignored if O_PATH is used, but it allows nginx to not fail when it was built on modern system (i.e. glibc 2.14+) and run with a kernel older than 2.6.39. Then O_PATH is unknown to the kernel and ignored, while O_RDONLY is used. Sadly, fstat() is not working with O_PATH descriptors till Linux 3.6. As a workaround we fallback to fstatat() with the AT_EMPTY_PATH flag that was introduced at the same time as O_PATH.
author Valentin Bartenev <vbart@nginx.com>
date Mon, 02 Sep 2013 08:07:59 +0400
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 */
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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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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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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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
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36 umask(0);
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37
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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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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
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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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60 #endif
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61
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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 }