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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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5
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6
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7 #ifndef _NGX_BUF_H_INCLUDED_
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8 #define _NGX_BUF_H_INCLUDED_
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9
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10
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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13
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14
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15 typedef void * ngx_buf_tag_t;
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16
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17 typedef struct ngx_buf_s ngx_buf_t;
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18
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19 struct ngx_buf_s {
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20 u_char *pos;
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21 u_char *last;
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22 off_t file_pos;
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23 off_t file_last;
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24
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25 u_char *start; /* start of buffer */
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26 u_char *end; /* end of buffer */
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27 ngx_buf_tag_t tag;
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28 ngx_file_t *file;
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29 ngx_buf_t *shadow;
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30
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31
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32 /* the buf's content could be changed */
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33 unsigned temporary:1;
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34
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35 /*
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36 * the buf's content is in a memory cache or in a read only memory
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37 * and must not be changed
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38 */
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39 unsigned memory:1;
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40
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41 /* the buf's content is mmap()ed and must not be changed */
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42 unsigned mmap:1;
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43
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44 unsigned recycled:1;
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45 unsigned in_file:1;
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46 unsigned flush:1;
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58
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47 unsigned sync:1;
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0
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48 unsigned last_buf:1;
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58
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49 unsigned last_in_chain:1;
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0
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50
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51 unsigned last_shadow:1;
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52 unsigned temp_file:1;
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53
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54 /* STUB */ int num;
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55 };
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56
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57
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58 struct ngx_chain_s {
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59 ngx_buf_t *buf;
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60 ngx_chain_t *next;
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61 };
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62
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63
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64 typedef struct {
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65 ngx_int_t num;
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66 size_t size;
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67 } ngx_bufs_t;
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68
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69
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518
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70 typedef struct ngx_output_chain_ctx_s ngx_output_chain_ctx_t;
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71
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28
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72 typedef ngx_int_t (*ngx_output_chain_filter_pt)(void *ctx, ngx_chain_t *in);
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0
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73
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518
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74 #if (NGX_HAVE_FILE_AIO)
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75 typedef void (*ngx_output_chain_aio_pt)(ngx_output_chain_ctx_t *ctx,
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76 ngx_file_t *file);
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77 #endif
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78
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79 struct ngx_output_chain_ctx_s {
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80 ngx_buf_t *buf;
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81 ngx_chain_t *in;
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82 ngx_chain_t *free;
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83 ngx_chain_t *busy;
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84
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516
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85 unsigned sendfile:1;
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86 unsigned directio:1;
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410
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87 #if (NGX_HAVE_ALIGNED_DIRECTIO)
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516
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88 unsigned unaligned:1;
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410
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89 #endif
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516
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90 unsigned need_in_memory:1;
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91 unsigned need_in_temp:1;
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0
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92
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518
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93 off_t alignment;
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94
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95 ngx_pool_t *pool;
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96 ngx_int_t allocated;
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97 ngx_bufs_t bufs;
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98 ngx_buf_tag_t tag;
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99
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100 ngx_output_chain_filter_pt output_filter;
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101 void *filter_ctx;
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518
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102
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103 #if (NGX_HAVE_FILE_AIO)
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104 ngx_output_chain_aio_pt aio;
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105 #endif
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106 };
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0
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107
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108
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109 typedef struct {
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110 ngx_chain_t *out;
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111 ngx_chain_t **last;
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112 ngx_connection_t *connection;
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113 ngx_pool_t *pool;
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114 off_t limit;
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115 } ngx_chain_writer_ctx_t;
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116
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117
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118 #define NGX_CHAIN_ERROR (ngx_chain_t *) NGX_ERROR
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119
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120
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121 #define ngx_buf_in_memory(b) (b->temporary || b->memory || b->mmap)
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122 #define ngx_buf_in_memory_only(b) (ngx_buf_in_memory(b) && !b->in_file)
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144
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123
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0
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124 #define ngx_buf_special(b) \
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58
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125 ((b->flush || b->last_buf || b->sync) \
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126 && !ngx_buf_in_memory(b) && !b->in_file)
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0
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127
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144
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128 #define ngx_buf_sync_only(b) \
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129 (b->sync \
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130 && !ngx_buf_in_memory(b) && !b->in_file && !b->flush && !b->last_buf)
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131
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0
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132 #define ngx_buf_size(b) \
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48
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133 (ngx_buf_in_memory(b) ? (off_t) (b->last - b->pos): \
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134 (b->file_last - b->file_pos))
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0
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135
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136 ngx_buf_t *ngx_create_temp_buf(ngx_pool_t *pool, size_t size);
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137 ngx_chain_t *ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs);
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138
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139
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140 #define ngx_alloc_buf(pool) ngx_palloc(pool, sizeof(ngx_buf_t))
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141 #define ngx_calloc_buf(pool) ngx_pcalloc(pool, sizeof(ngx_buf_t))
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142
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56
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143 ngx_chain_t *ngx_alloc_chain_link(ngx_pool_t *pool);
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144 #define ngx_free_chain(pool, cl) \
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145 cl->next = pool->chain; \
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146 pool->chain = cl
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147
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0
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148
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149
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150 ngx_int_t ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in);
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28
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151 ngx_int_t ngx_chain_writer(void *ctx, ngx_chain_t *in);
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152
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153 ngx_int_t ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
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48
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154 ngx_chain_t *in);
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130
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155 ngx_chain_t *ngx_chain_get_free_buf(ngx_pool_t *p, ngx_chain_t **free);
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0
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156 void ngx_chain_update_chains(ngx_chain_t **free, ngx_chain_t **busy,
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48
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157 ngx_chain_t **out, ngx_buf_tag_t tag);
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0
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158
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159
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160 #endif /* _NGX_BUF_H_INCLUDED_ */
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