nginx执行流程

最新推荐文章于 2024-05-22 09:58:16 发布

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最新推荐文章于 2024-05-22 09:58:16 发布

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分类专栏： nginx 文章标签： nginx debug

本文链接：https://blog.youkuaiyun.com/leafrenchleaf/article/details/84549473

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目标：打印nginx执行之后的流程方法

my_debug.c


cat my_debug.c
#include "my_debug.h"
#define MY_DEBUG_FILE_PATH1 "/usr/local/nginx_sendfile/sbin/trace.txt"
#define MY_DEBUG_FILE_PATH "/data/haoning/mygit/mynginxmodule/nginx_release/debug/my_debug.log"
int _flag=0;
#define open_my_debug_file() \
    (my_debug_fd=fopen(MY_DEBUG_FILE_PATH,"a"))
#define close_my_debug_file() \
    do { \
        if (NULL != my_debug_fd) { \
            fclose(my_debug_fd); \
        } \
    }while(0)

#define my_debug_print(args,fmt...) \
    do{ \
        if (0 == _flag) { \
            break; \
        } \
        if (NULL == my_debug_fd && NULL == open_my_debug_file()) { \
            printf("Err: can not open output file.\n"); \
            break; \
        } \
        fprintf(my_debug_fd,args,##fmt); \
        fflush(my_debug_fd); \
    }while(0)

void enable_my_debug( void )
{
    _flag = 1;
}
void disable_my_debug( void )
{
    _flag = 0;
}
int get_my_debug_flag( void )
{
    return _flag;
}
void set_my_debug_flag( int flag )
{
    _flag = flag;
}
void main_constructor( void )
{
    //do nothing
}
void main_destructor( void )
{
    close_my_debug_file();
}
void __cyg_profile_func_enter( void *this,void *call )
{
    my_debug_print("enter\n%p\n%p\n",call,this);
}
void __cyg_profile_func_exit( void *this,void *call )
{
    my_debug_print("exit\n%p\n%p\n",call,this);
}

my_debug.h


#ifndef MY_DEBUG_LENKY_H
#define MY_DEBUG_LENKY_H
#include <stdio.h>

void enable_my_debug( void ) __attribute__((no_instrument_function));
void disable_my_debug( void ) __attribute__((no_instrument_function));
int get_my_debug_flag( void ) __attribute__((no_instrument_function));
void set_my_debug_flag( int ) __attribute__((no_instrument_function));
void main_constructor( void  ) __attribute__((no_instrument_function,constructor));
void main_destructor( void  ) __attribute__((no_instrument_function,destructor));
void __cyg_profile_func_enter( void *,void *  ) __attribute__((no_instrument_function));
void __cyg_profile_func_exit( void *,void *  ) __attribute__((no_instrument_function));

#ifndef MY_DEBUG_MAIN
extern FILE *my_debug_fd;
#else
FILE *my_debug_fd;
#endif
#endif

cp my_debug.c my_debug.h ../nginx-1.5.6/src/core/

vim ../nginx-1.5.6/src/core/nginx.c


  11 #include   <nginx.h>
  12 #include   "my_debug.h"
.....
204 main(int argc, char *const *argv)
205 {
206     enable_my_debug();

configure之后修改objs/Makefile


CFLAGS =  -pipe  -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Werror -g -finstrument-functions
...
18 CORE_DEPS = src/core/nginx.h \
19     src/core/my_debug.h \ 
.....
  84 HTTP_DEPS = src/http/ngx_http.h \
  85     src/core/my_debug.h \
....

 105 objs/nginx: objs/src/core/nginx.o \
 106     objs/src/core/my_debug.o \  
......
 216     $(LINK) -o objs/nginx \
 217     objs/src/core/nginx.o \
 218     objs/src/core/my_debug.o \ 
......
 331 objs/src/core/my_debug.o:   $(CORE_DEPS) src/core/my_debug.c                                                                                                       
 332     $(CC) -c $(CFLAGS) $(CORE_INCS) \
 333         -o objs/src/core/my_debug.o \
 334         src/core/my_debug.c

make &&make install 之后
启动
./nginx
得到
/data/haoning/mygit/mynginxmodule/nginx_release/debug/my_debug.log
编写处理脚本
addr2line.sh


#!/bin/sh
if [ $# != 3 ]; then
    echo 'Usage: addr2line.sh executefile addressfile functionfile'
    exit;
fi;
echo "begin"
cat $2 |while read line
do
    if [ "$line" = 'enter' ]; then
        read line1
        read line2
#       echo $line >> $3
        addr2line -e $1 -f $line1 -s >>$3
        echo "--->" >> $3
        addr2line -e $1 -f $line2 -s | sed 's/^/  /' >> $3
        echo  >> $3
    elif [ "$line" = 'exit' ]; then
        read line1
        read line2
        addr2line -e $1 -f $line2 -s | sed 's/^/  /' >> $3
        echo "<---" >> $3
        addr2line -e $1 -f $line1 -s  >> $3
#       echo $line >> $3
        echo >> $3
    fi;
done
echo "end"

./addr2line.sh /usr/local/nginx_sendfile/sbin/nginx my_debug.log a.log
生成a.log为所要的结果
类似如下


main                                                                                                                                                                    
nginx.c:216
--->
  ngx_strerror_init
  ngx_errno.c:47

  ngx_strerror_init
  ngx_errno.c:47
<---
main
nginx.c:216

??
??:0
--->
  main
  nginx.c:205

  main
  nginx.c:205
<---
??
??:0

main
nginx.c:280
--->
  ngx_time_init
  ngx_times.c:61

ngx_time_init
ngx_times.c:69
--->
  ngx_time_update
  ngx_times.c:75

ngx_time_update
ngx_times.c:116
--->
  ngx_gmtime
  ngx_times.c:284

  ngx_gmtime
  ngx_times.c:284
<---
ngx_time_update
ngx_times.c:116