Mercurial > hg > nginx
annotate src/core/ngx_crc.h @ 9269:4eb02e5ddb48
Core: added realpath() checking when testing PID files.
This ensures that if the PID file path is changed, yet resolves to the
same file via symbolic links, trying to recreate the PID file won't
remove it. In particular, this resolves issues as observed on Linux
systems with "/var/run/nginx.pid" changed to "/run/nginx.pid".
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 13 May 2024 06:13:12 +0300 |
parents | d620f497c50f |
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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. |
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5 */ |
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8 #ifndef _NGX_CRC_H_INCLUDED_ |
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9 #define _NGX_CRC_H_INCLUDED_ |
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11 |
792 | 12 #include <ngx_config.h> |
13 #include <ngx_core.h> | |
14 | |
15 | |
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16 /* 32-bit crc16 */ |
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17 |
776 | 18 static ngx_inline uint32_t |
789 | 19 ngx_crc(u_char *data, size_t len) |
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20 { |
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21 uint32_t sum; |
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23 for (sum = 0; len; len--) { |
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25 /* |
776 | 26 * gcc 2.95.2 x86 and icc 7.1.006 compile |
27 * that operator into the single "rol" opcode, | |
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28 * msvc 6.0sp2 compiles it into four opcodes. |
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29 */ |
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30 sum = sum >> 1 | sum << 31; |
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31 |
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32 sum += *data++; |
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33 } |
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34 |
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35 return sum; |
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36 } |
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37 |
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38 |
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39 #endif /* _NGX_CRC_H_INCLUDED_ */ |