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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <execinfo.h>
  4. #include <signal.h>
  5. #include <unistd.h>
  6.  
  7. void handler ( int sig ) {
  8. 	void *array [ 10 ];
  9. 	size_t size;
  10.  
  11. 	// get void*'s for all entries on the stack
  12. 	size = backtrace ( array, 10 );
  13.  
  14. 	// print out all the frames to stderr
  15. 	fprintf ( stderr, "Error: signal %d\n", sig );
  16.  
  17. 	char **buffer = backtrace_symbols ( array, size );
  18.  
  19. 	if ( buffer == 0 ) {
  20. 		fprintf ( stderr, "backtrace_symbols" );
  21. 		exit ( 1 );
  22. 	}
  23.  
  24. 	fprintf ( stderr, "Obtained %zd stack frames.\n", size );
  25. 	for ( size_t i = 0; i < size; i++ ) {
  26. 		//fprintf ( stderr, "%lu. %s - %p\n", i, buffer [ i ], array [ i ] );
  27. 		fprintf ( stderr, "%d. %s - %p\n", i, buffer [ i ], array [ i ] );
  28. 	}
  29. 	fprintf ( stderr, "\n\n" );
  30.  
  31. 	free ( buffer );
  32. 	exit ( 1 );
  33. }
  34.  
  35. void baz ( ) {
  36. 	int *foo = ( int * ) -1;      // Make a bad pointer
  37. 	printf ( "%d\n", *foo );  // causes segfault
  38. }
  39.  
  40. void bar ( ) {
  41. 	baz ( );
  42. }
  43.  
  44. void foo ( ) {
  45. 	bar ( );
  46. }
  47.  
  48. int main ( int argc, char ** argv ) {
  49. 	signal ( SIGSEGV, handler );
  50. 	foo ( );
  51. 	return 0;
  52. }
  53.  
Runtime error #stdin #stdout #stderr 0s 3424KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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Error: signal 11
Obtained 5 stack frames.
0. ./prog() [0x804868b] - 0x804868b
1. linux-gate.so.1(__kernel_sigreturn+0) [0xb775a400] - 0xb775a400
2. ./prog() [0x804855d] - 0x804855d
3. /lib/i386-linux-gnu/i686/cmov/libc.so.6(__libc_start_main+0xf5) [0xb74748f5] - 0xb74748f5
4. ./prog() [0x8048599] - 0x8048599
https://ideone.com/nGy8Kg
Blogget Post (http://c...content-available-to-author-only...m.br/2014/05/debugging-simple-program-after-sigsegv.html)
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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