基本数据结构

<code><span>typedef</span> intptr_t        ngx_int_t;
<span>typedef</span> uintptr_t       ngx_uint_t;
<span>typedef</span> intptr_t        ngx_flag_t;</code>

<code><span>/* Types for `void *' pointers.  */</span><span>#if __WORDSIZE == 64</span><span># ifndef __intptr_t_defined</span>
typedef <span>long</span><span>int</span>        intptr_t;
<span>#  define __intptr_t_defined</span><span># endif</span>
typedef unsigned <span>long</span><span>int</span>   uintptr_t;
<span>#else</span><span># ifndef __intptr_t_defined</span>
typedef <span>int</span>         intptr_t;
<span>#  define __intptr_t_defined</span><span># endif</span>
typedef unsigned <span>int</span>        uintptr_t;
<span>#endif</span></code>

<code><span>typedef</span> struct {
    size_t      len;
    u_char     *<span><span>data</span>;</span>
} ngx_str_t;
</code>

<code><span>typedef</span><span>struct</span> {
    ngx_str_t   key;
    ngx_str_t   value;
} ngx_keyval_t;


<span>typedef</span><span>struct</span> {  <span>// 位域用来标示类型等元信息</span><span>unsigned</span>    len:<span>28</span>;
    <span>unsigned</span>    valid:<span>1</span>;
    <span>unsigned</span>    no_cacheable:<span>1</span>;
    <span>unsigned</span>    not_found:<span>1</span>;
    <span>unsigned</span>    escape:<span>1</span>;

    u_char     *data;
} ngx_variable_value_t;
<span>typedef</span><span>struct</span> {
    ngx_rbtree_node_t         node;
    ngx_str_t                 str;
} ngx_str_node_t;</code>

<code><span>typedef</span><span>int</span>               ngx_err_t;
<span>// 根据错误号err,将对应的描述信息拷贝到errstr，最多拷贝size字节</span>
u_char *ngx_strerror(ngx_err_t err, u_char *errstr, size_t size); 
ngx_int_t ngx_strerror_init(<span>void</span>);</code>