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annotate src/os/unix/ngx_os.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 56fc55e32f23
children 3d455e37abf8
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
Igor Sysoev <igor@sysoev.ru>
parents: 417
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
Igor Sysoev <igor@sysoev.ru>
parents: 417
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2 /*
444
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
4412
d620f497c50f Copyright updated.
Maxim Konovalov <maxim@nginx.com>
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4 * Copyright (C) Nginx, Inc.
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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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5 */
da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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4c698194c56d nginx-0.0.1-2003-11-13-19:16:33 import
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8 #ifndef _NGX_OS_H_INCLUDED_
4c698194c56d nginx-0.0.1-2003-11-13-19:16:33 import
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9 #define _NGX_OS_H_INCLUDED_
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4c698194c56d nginx-0.0.1-2003-11-13-19:16:33 import
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12 #include <ngx_config.h>
4c698194c56d nginx-0.0.1-2003-11-13-19:16:33 import
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13 #include <ngx_core.h>
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16 #define NGX_IO_SENDFILE 1
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4c698194c56d nginx-0.0.1-2003-11-13-19:16:33 import
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5659d773cfa8 nginx-0.0.7-2004-07-15-20:35:51 import
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19 typedef ssize_t (*ngx_recv_pt)(ngx_connection_t *c, u_char *buf, size_t size);
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20 typedef ssize_t (*ngx_recv_chain_pt)(ngx_connection_t *c, ngx_chain_t *in,
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21 off_t limit);
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22 typedef ssize_t (*ngx_send_pt)(ngx_connection_t *c, u_char *buf, size_t size);
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23 typedef ngx_chain_t *(*ngx_send_chain_pt)(ngx_connection_t *c, ngx_chain_t *in,
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24 off_t limit);
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26 typedef struct {
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27 ngx_recv_pt recv;
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28 ngx_recv_chain_pt recv_chain;
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29 ngx_recv_pt udp_recv;
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30 ngx_send_pt send;
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31 ngx_send_pt udp_send;
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32 ngx_send_chain_pt udp_send_chain;
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33 ngx_send_chain_pt send_chain;
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34 ngx_uint_t flags;
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35 } ngx_os_io_t;
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38 ngx_int_t ngx_os_init(ngx_log_t *log);
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39 void ngx_os_status(ngx_log_t *log);
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40 ngx_int_t ngx_os_specific_init(ngx_log_t *log);
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41 void ngx_os_specific_status(ngx_log_t *log);
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42 ngx_int_t ngx_daemon(ngx_log_t *log);
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43 ngx_int_t ngx_os_signal_process(ngx_cycle_t *cycle, char *sig, ngx_pid_t pid);
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46 ssize_t ngx_unix_recv(ngx_connection_t *c, u_char *buf, size_t size);
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47 ssize_t ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *entry, off_t limit);
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48 ssize_t ngx_udp_unix_recv(ngx_connection_t *c, u_char *buf, size_t size);
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49 ssize_t ngx_unix_send(ngx_connection_t *c, u_char *buf, size_t size);
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7650aea1816f nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
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50 ngx_chain_t *ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in,
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51 off_t limit);
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52 ssize_t ngx_udp_unix_send(ngx_connection_t *c, u_char *buf, size_t size);
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Roman Arutyunyan <arut@nginx.com>
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53 ngx_chain_t *ngx_udp_unix_sendmsg_chain(ngx_connection_t *c, ngx_chain_t *in,
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54 off_t limit);
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56
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57 #if (IOV_MAX > 64)
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58 #define NGX_IOVS_PREALLOCATE 64
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59 #else
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60 #define NGX_IOVS_PREALLOCATE IOV_MAX
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61 #endif
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62
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63
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64 typedef struct {
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65 struct iovec *iovs;
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66 ngx_uint_t count;
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67 size_t size;
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68 ngx_uint_t nalloc;
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69 } ngx_iovec_t;
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70
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71 ngx_chain_t *ngx_output_chain_to_iovec(ngx_iovec_t *vec, ngx_chain_t *in,
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72 size_t limit, ngx_log_t *log);
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73
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74
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75 ssize_t ngx_writev(ngx_connection_t *c, ngx_iovec_t *vec);
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76
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77
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78 extern ngx_os_io_t ngx_os_io;
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79 extern ngx_int_t ngx_ncpu;
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80 extern ngx_int_t ngx_max_sockets;
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8e8f3af115b5 nginx-0.1.11-RELEASE import
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81 extern ngx_uint_t ngx_inherited_nonblocking;
8e8f3af115b5 nginx-0.1.11-RELEASE import
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82 extern ngx_uint_t ngx_tcp_nodelay_and_tcp_nopush;
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84
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85 #if (NGX_FREEBSD)
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86 #include <ngx_freebsd.h>
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88
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89 #elif (NGX_LINUX)
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90 #include <ngx_linux.h>
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92
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93 #elif (NGX_SOLARIS)
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94 #include <ngx_solaris.h>
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95
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96
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97 #elif (NGX_DARWIN)
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98 #include <ngx_darwin.h>
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99 #endif
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102 #endif /* _NGX_OS_H_INCLUDED_ */