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annotate src/os/unix/ngx_socket.h @ 7668:0a04e5e4c40b

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Large block sizes on Linux are now ignored (ticket #1168). NFS on Linux is known to report wsize as a block size (in both f_bsize and f_frsize, both in statfs() and statvfs()). On the other hand, typical file system block sizes on Linux (ext2/ext3/ext4, XFS) are limited to pagesize. (With FAT, block sizes can be at least up to 512k in extreme cases, but this doesn't really matter, see below.) To avoid too aggressive cache clearing on NFS volumes on Linux, block sizes larger than pagesize are now ignored. Note that it is safe to ignore large block sizes. Since 3899:e7cd13b7f759 (1.0.1) cache size is calculated based on fstat() st_blocks, and rounding to file system block size is preserved mostly for Windows. Note well that on other OSes valid block sizes seen are at least up to 65536. In particular, UFS on FreeBSD is known to work well with block and fragment sizes set to 65536.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 22 Jun 2020 18:02:58 +0300
parents efd71d49bde0
children 23880e4ad3e2
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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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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 #ifndef _NGX_SOCKET_H_INCLUDED_
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9 #define _NGX_SOCKET_H_INCLUDED_
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12 #include <ngx_config.h>
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15 #define NGX_WRITE_SHUTDOWN SHUT_WR
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17 typedef int ngx_socket_t;
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19 #define ngx_socket socket
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20 #define ngx_socket_n "socket()"
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23 #if (NGX_HAVE_FIONBIO)
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25 int ngx_nonblocking(ngx_socket_t s);
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26 int ngx_blocking(ngx_socket_t s);
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28 #define ngx_nonblocking_n "ioctl(FIONBIO)"
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29 #define ngx_blocking_n "ioctl(!FIONBIO)"
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31 #else
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33 #define ngx_nonblocking(s) fcntl(s, F_SETFL, fcntl(s, F_GETFL) | O_NONBLOCK)
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34 #define ngx_nonblocking_n "fcntl(O_NONBLOCK)"
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36 #define ngx_blocking(s) fcntl(s, F_SETFL, fcntl(s, F_GETFL) & ~O_NONBLOCK)
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37 #define ngx_blocking_n "fcntl(!O_NONBLOCK)"
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39 #endif
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40
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41 #if (NGX_HAVE_FIONREAD)
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43 #define ngx_socket_nread(s, n) ioctl(s, FIONREAD, n)
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44 #define ngx_socket_nread_n "ioctl(FIONREAD)"
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46 #endif
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48 int ngx_tcp_nopush(ngx_socket_t s);
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49 int ngx_tcp_push(ngx_socket_t s);
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51 #if (NGX_LINUX)
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53 #define ngx_tcp_nopush_n "setsockopt(TCP_CORK)"
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54 #define ngx_tcp_push_n "setsockopt(!TCP_CORK)"
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56 #else
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58 #define ngx_tcp_nopush_n "setsockopt(TCP_NOPUSH)"
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59 #define ngx_tcp_push_n "setsockopt(!TCP_NOPUSH)"
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61 #endif
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64 #define ngx_shutdown_socket shutdown
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65 #define ngx_shutdown_socket_n "shutdown()"
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67 #define ngx_close_socket close
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68 #define ngx_close_socket_n "close() socket"
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71 #endif /* _NGX_SOCKET_H_INCLUDED_ */