dump function call trace

dump function call trace: You can get the function call graph, some of the time for tracking bug, understand the program structure is of particular importance.

Kernel function call trace

The kernel provides dump_stack () function, use this function, you can print out the current function call path.

dump_stack is an architecture-related functions, for the arm platform, implementation of this function position arch/arm/kernel/traps.c

Application layer function call trace

glibc provides a backtrace and backtrace_symbols function, the application layer can use their print function calls

backtrace, backtrace_symbols examples of the use

[Cpp] View PlainCopy

1. # Include <stdio.h>  
2. # Include <stdlib.h>  
3. # Include <execinfo.h>  
4.   
5. void  do_backtrace ()  
6. {  
7. # Define BACKTRACE_SIZ 100  
8.     void  * array [BACKTRACE_SIZ];  
9.     int  size, i;  
10.     char  ** strings;  
11.   
12.     size = backtrace (array, BACKTRACE_SIZ);  
13.     strings = backtrace_symbols (array, size);  
14.   
15.     for  (i = 0; i <size; + + i) {  
16.         printf ( "% P:% s \ N" , array [i], strings [i]);  
17.     }  
18.   
19.     printf ( "----------------------------------------------- ---------- \ N " );  
20.     free (strings);  
21. }  
22.   
23. int  foo ()  
24. {  
25.     do_backtrace ();  
26. }  
27.   
28. int  Bar ( void )  
29. {  
30.     foo ();  
31.     return  0;  
32. }  
33.   
34. int  Boo ( void )  
35. {  
36.     bar ();  
37.     return  0;  
38. }  
39.   
40. int  baz ( void )  
41. {  
42.     boo ();  
43.     return  0;  
44. }  
45.   
46. int  main ( void )  
47. {  
48.     baz ();  
49.     return  0;  
50. }