应用程序段错误堆栈打印

应用程序段错误堆栈打印，嵌入到应用程序，打印同时记录到syslog，方便查看段错误原因
gcc -g -rdynamic -O0 strlen_test.c -o strlen_test

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1. #include <stdio.h>
   
2. #include <string.h>
   
3. #include <unistd.h>
   
4. 
   
5. #include <signal.h>
   
6. #include <execinfo.h>
   
7. #include <syslog.h>
   
8. #include <stdlib.h>
   
9. 
   
10. #define SIZE 1024
    
11. static void *trap_buffer[SIZE];
    
12. static void fault_trap(int n, siginfo_t* msiginfo, void* myact)
    
13. {
    
14.     int i, num;
    
15.     char **calls;
    
16.     
    
17.     printf("Fault address:%p\n", msiginfo->si_addr);
    
18.     syslog(LOG_USER | LOG_ERR, "DROPSTAT:SIGSEGV-%p \n", msiginfo->si_addr);
    
19.     num = backtrace(trap_buffer, SIZE);
    
20.     calls = backtrace_symbols(trap_buffer, num);
    
21.     for (i = 0; i < num; i++) {
    
22.             printf("%s\n", calls[i]);
    
23.             syslog(LOG_USER | LOG_ERR, "DROPSTAT:SIGSEGV-%s \n", calls[i]);
    
24.     }            
    
25.     exit(1);
    
26. }
    
27. static void setup_trap()
    
28. {
    
29.     struct sigaction act;
    
30. 
    
31.     sigemptyset(&act.sa_mask);
    
32.     act.sa_flags=SA_SIGINFO;
    
33.     act.sa_sigaction=fault_trap;
    
34.     sigaction(SIGSEGV,&act,NULL);
    
35. }
    
36. 
    
37. 
    
38. int main()
    
39. {
    
40.     //char *p = 100 ;
    
41.     char *p = NULL ;
    
42.     unsigned long len = 0 ;
    
43.     
    
44.     sleep(30);
    
45.     
    
46.     setup_trap();
    
47.     
    
48.     //len = strlen(p) ; //报错
    
49.     *p = 5;
    
50.     
    
51.     return 0;
    
52. }

===============



/ # ./strlen_test
Fault address:(nil)
./strlen_test() [0x400981]
/lib/libc.so.6() [0x3902833350]
./strlen_test(main+0x30) [0x400a7f]
/lib/libc.so.6(__libc_start_main+0xf1) [0x3902820531]
./strlen_test(_start+0x2a) [0x40085a]
/ #

sh-4.4# cat var/log/syslog | tail
2019-09-23T19:55:34.574950+00:00 (none) strlen_test: DROPSTAT:SIGSEGV-(nil)
2019-09-23T19:55:34.575243+00:00 (none) strlen_test: DROPSTAT:SIGSEGV-./strlen_test() [0x400981]
2019-09-23T19:55:34.575279+00:00 (none) strlen_test: DROPSTAT:SIGSEGV-/lib/libc.so.6() [0x3902833350]
2019-09-23T19:55:34.575306+00:00 (none) strlen_test: DROPSTAT:SIGSEGV-./strlen_test(main+0x30) [0x400a7f]
2019-09-23T19:55:34.575334+00:00 (none) strlen_test: DROPSTAT:SIGSEGV-/lib/libc.so.6(__libc_start_main+0xf1) [0x3902820531]
2019-09-23T19:55:34.575359+00:00 (none) strlen_test: DROPSTAT:SIGSEGV-./strlen_test(_start+0x2a) [0x40085a]

其他：
参数解释
If SA_SIGINFO is specified in sa_flags, then sa_sigaction (instead of sa_handler) specifies the signal-handling function for signum.  This
       function  receives  the signal number as its first argument, a pointer to a siginfo_t as its second argument and a pointer to a ucontext_t
       (cast to void *) as its third argument.  (Commonly, the handler function doesn't make any use of the third  argument.   See  getcontext(3)
       for further information about ucontext_t.)