helloworld
config
ngx_addon_name=ngx_http_mytest_module HTTP_MODULES="$HTTP_MODULES ngx_http_mytest_module" NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_mytest_module.c"
ngx_http_mytest_module.c
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#define HELLO 42
static char * ngx_http_mytest(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static ngx_int_t ngx_http_mytest_handler(ngx_http_request_t *r);
static ngx_command_t ngx_http_mytest_commands[] =
{
{
ngx_string("mytest"),
NGX_HTTP_MAIN_CONF | NGX_HTTP_SRV_CONF | NGX_HTTP_LOC_CONF | NGX_HTTP_LMT_CONF | NGX_CONF_NOARGS,
ngx_http_mytest,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL
},
ngx_null_command
};
static ngx_http_module_t ngx_http_mytest_module_ctx =
{
NULL,/* preconfiguration */
NULL,/* postconfiguration */
NULL,/* create main configuration */
NULL,/* init main configuration */
NULL,/* create server configuration */
NULL,/* merge server configuration */
NULL,/* create location configuration */
NULL /* merge location configuration */
};
ngx_module_t ngx_http_mytest_module =
{
NGX_MODULE_V1,
&ngx_http_mytest_module_ctx,/* module context */
ngx_http_mytest_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static char * ngx_http_mytest(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_core_loc_conf_t *clcf;
//First find the configuration block to which the mytest configuration item belongs, clcf seems to be the data in the location block
//Structure, in fact, it can be a main, srv or loc level configuration item, that is to say, in each
//http{} and server{} also have an ngx_http_core_loc_conf_t structure
clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
//When the http framework processes user requests to the NGX_HTTP_CONTENT_PHASE stage, if
//The requested host domain name and URI match the configuration block where the mytest configuration item is located, and we will be called
//The implemented ngx_http_mytest_handler method handles this request
clcf->handler = ngx_http_mytest_handler;
return NGX_CONF_OK;
}
static ngx_int_t ngx_http_mytest_handler(ngx_http_request_t *r)
{
int watchpoint = 12;
printf("this is ngx_hello %d \n",HELLO);
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0," haoning error \n");
//Must be GET or HEAD method, otherwise return 405 Not Allowed
if (!(r->method & (NGX_HTTP_GET | NGX_HTTP_HEAD)))
{
return NGX_HTTP_NOT_ALLOWED;
}
//Discard the body of the request
ngx_int_t rc = ngx_http_discard_request_body(r);
if (rc != NGX_OK)
{
return rc;
}
//Set the returned Content-Type. Note that ngx_str_t has a handy initialization macro
//ngx_string, it can set the data and len members of ngx_str_t
ngx_str_t type = ngx_string("text/plain");
//returned package body content
ngx_str_t response = ngx_string("Hello World!");
//Set the return status code
r->headers_out.status = NGX_HTTP_OK;
//The response packet has body content, so you need to set the Content-Length length
r->headers_out.content_length_n = response.len;
//Set Content-Type
r->headers_out.content_type = type;
//send http header
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || rc > NGX_OK || r->header_only)
{
return rc;
}
//Construct the ngx_buf_t structure to prepare to send the packet body
ngx_buf_t * b;
b = ngx_create_temp_buf(r->pool, response.len);
watchpoint = 42;
if (b == NULL)
{
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
//Copy Hello World to the memory pointed to by ngx_buf_t
ngx_memcpy (b-> pos, response.data, response.len);
//Note, be sure to set the last pointer
b->last = b->pos + response.len;
//declare this is the last buffer
b->last_buf = 1;
//Construct the ngx_chain_t structure when sending
ngx_chain_t out;
//Assign ngx_buf_t
out.buf = b;
//Set next to NULL
out.next = NULL;
//The last step to send the packet body, the http framework will call the ngx_http_finalize_request method
//end request
return ngx_http_output_filter(r, &out);
}
./configure --prefix=/usr/local/nginx --add-module=/opt/chapter3/helloworld
make
./configure --prefix=/usr/local/nginx --add-module=/opt/chapter3/helloworld
#./configure --with-debug --prefix=/usr/local/nginx --add-module=/opt/chapter3/helloworld
#CFLAGS="-g3 -O0" ./configure --prefix=/usr/local/nginx --with-debug --add-module=/opt/chapter3/helloworld
#./configure --with-cc-opt='-ggdb3 -O0' --prefix=/usr/local/nginx --with-debug
make
#make CFLAGS="-ggdb3 -O0"
grep -nR hello *
/opt/nginx-1.13.3/objs/addon/helloworld
vim /usr/local/nginx/conf/nginx.conf
location /hello {
mytest;
}
###########
curl localhost/hello
If you bring -ggdb3 or -g3
info macro ,
if you don't need to l
gdb /usr/local/nginx/sbin/nginx
or gdb -p `nginx worker process`
set args -c /usr/local/nginx/conf/nginx.conf b ngx_cycle.c: 1264 b ngx_http_mytest_module.c:63 set follow-fork-mode child
Switch to the subprocess
r
info macro
to find the worker process of nginx
gdb -q -p `pidof nginx`