Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_daemon.c @ 4311:45272aab5eea
Unlock of shared memory zones on process crash.
If process exited abnormally while holding lock on some shared memory zone -
unlock it. It may be not safe thing to do (as crash with lock held may
result in corrupted shared memory structure, and other processes will
subsequently crash while trying to access shared data), therefore complain
loudly if unlock succeeds.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Wed, 23 Nov 2011 14:09:19 +0000 |
parents | 64d9afb209da |
children | d620f497c50f |
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 |
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4 */ |
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6 |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 |
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499 | 11 ngx_int_t ngx_daemon(ngx_log_t *log) |
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12 { |
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13 int fd; |
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14 |
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15 switch (fork()) { |
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16 case -1: |
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17 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "fork() failed"); |
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18 return NGX_ERROR; |
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19 |
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20 case 0: |
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21 break; |
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22 |
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23 default: |
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24 exit(0); |
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25 } |
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26 |
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27 ngx_pid = ngx_getpid(); |
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28 |
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29 if (setsid() == -1) { |
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30 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "setsid() failed"); |
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31 return NGX_ERROR; |
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32 } |
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33 |
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34 umask(0); |
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35 |
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36 fd = open("/dev/null", O_RDWR); |
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37 if (fd == -1) { |
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38 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, |
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39 "open(\"/dev/null\") failed"); |
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40 return NGX_ERROR; |
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41 } |
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42 |
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43 if (dup2(fd, STDIN_FILENO) == -1) { |
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44 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDIN) failed"); |
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45 return NGX_ERROR; |
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46 } |
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47 |
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48 if (dup2(fd, STDOUT_FILENO) == -1) { |
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49 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDOUT) failed"); |
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50 return NGX_ERROR; |
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51 } |
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52 |
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53 #if 0 |
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54 if (dup2(fd, STDERR_FILENO) == -1) { |
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55 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDERR) failed"); |
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56 return NGX_ERROR; |
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57 } |
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58 #endif |
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59 |
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60 if (fd > STDERR_FILENO) { |
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61 if (close(fd) == -1) { |
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62 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "close() failed"); |
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63 return NGX_ERROR; |
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64 } |
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65 } |
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66 |
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67 return NGX_OK; |
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68 } |