#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<signal.h>
#include<execinfo.h>
#include<time.h>

//signal 函数用法参考http://www.kernel.org/doc/man-pages/online/pages/man2/signal.2.html
//backtrace ，backtrace_symbols函数用法参考 http://www.kernel.org/doc/man-pages/online/pages/man3/backtrace.3.html
#if 0
static void WidebrightSegvHandler(int signum)
{
        void *array[10];
        size_t size;
        char **strings;
        size_t i, j;
        // 获取当前时间
        struct tm *newtime;
        char tmpbuf[128]={0};
        time_t lt1;
        lt1=time(NULL);
        newtime=localtime(&lt1);
        strftime(tmpbuf, 128, "Today is %A, day %d of %B in the year %Y.\n", newtime);
        fprintf(stderr,tmpbuf);

        signal(signum, SIG_DFL); /* 还原默认的信号处理handler */

        size = backtrace (array, 10);
        strings = (char **)backtrace_symbols (array, size);

        fprintf(stderr, "widebright received SIGSEGV! Stack trace:\n");
        for (i = 0; i < size; i++)
        {
                fprintf(stderr, "%zu %s \n",i,strings[i]);
        }

        free (strings);
        exit(1);
}
#else
// 写文件
static void WidebrightSegvHandler(int signum)
{
        void *array[10];
        size_t size;
        char **strings;
        size_t i, j;
        FILE  *  pFile =  fopen ("./backtrace", "a" );
        if  (pFile == NULL)
        {
                return ;
        }
        // 获取当前时间
        struct tm *newtime;
        char tmpbuf[128]={0};
        time_t lt1;
        lt1=time(NULL);
        newtime=localtime(&lt1);
        strftime(tmpbuf, 128, "Today is %A, day %d of %B in the year %Y.\n", newtime);
        fprintf(pFile,tmpbuf);

        signal(signum, SIG_DFL); /* 还原默认的信号处理handler */

        size = backtrace (array, 10);
        strings = (char **)backtrace_symbols (array, size);

        fprintf(pFile, "widebright received SIGSEGV! Stack trace:\n");
        for (i = 0; i < size; i++)
        {
                fprintf(pFile, "%zu %s \n",i,strings[i]);
        }

        free (strings);
        fclose(pFile);
        exit(1);
}
#endif

int invalide_pointer_error(char * p)
{
        *p = 'd'; //让这里出现一个访问非法指针的错误
        return 0;
}

void error_2(char * p)
{
        invalide_pointer_error(p);
}

void error_1(char * p)
{
        error_2(p);
}

void error_0(char * p)
{
        error_1(p);
}

int main()
{
        //设置 信好的处理函数,各种 信号的定义见http://www.kernel.org/doc/man-pages/online/pages/man7/signal.7.html
        signal(SIGSEGV, WidebrightSegvHandler); // SIGSEGV 11 Core Invalid memory reference
        signal(SIGABRT, WidebrightSegvHandler); // SIGABRT 6 Core Abort signal from

        char *a = NULL;
        error_0(a);
        exit(0);
}

widebright@widebright:~/桌面$ gcc main.c
widebright@widebright:~/桌面$ ./a.out
widebright received SIGSEGV! Stack trace:
0 ./a.out [0x8048580]
1 [0xb807a400]
2 ./a.out [0x8048636]
3 ./a.out [0x8048649]
4 ./a.out [0x804865c]
5 ./a.out [0x80486a9]
6 /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7f19775]

widebright@widebright:~/桌面$ gcc -g main.c
widebright@widebright:~/桌面$ ./a.out
widebright received SIGSEGV! Stack trace:
0 ./a.out [0x8048580]
1 [0xb7fb3400]
2 ./a.out [0x8048636]
3 ./a.out [0x8048649]
4 ./a.out [0x804865c]
5 ./a.out [0x80486a9]
6 /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7e52775]
7 ./a.out [0x80484c1]

widebright@widebright:~/桌面$ gcc -g -rdynamic main.c
widebright@widebright:~/桌面$ ./a.out
widebright received SIGSEGV! Stack trace:
0 ./a.out [0x8048840]
1 [0xb7f3d400]
2 ./a.out(error_2+0x11) [0x80488f6]
3 ./a.out(error_1+0x11) [0x8048909]
4 ./a.out(error_0+0x11) [0x804891c]
5 ./a.out(main+0x4b) [0x8048969]
6 /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7ddc775]
7 ./a.out [0x8048781]

-----------------------
(gdb) info line *0x8048580
Line 19 of "main.c" starts at address 0x804856d <WidebrightSegvHandler+25>
and ends at 0x8048583 <WidebrightSegvHandler+47>.
(gdb) list *0x8048580
0x8048580 is in WidebrightSegvHandler (main.c:19).
14 char **strings;
15 size_t i, j;
16
17 signal(signum, SIG_DFL); /* 还原默认的信号处理handler */
18
19 size = backtrace (array, 10);
20 strings = (char **)backtrace_symbols (array, size);
21
22 fprintf(stderr, "widebright received SIGSEGV! Stack trace:\n");
23 for (i = 0; i < size; i++) {
-----------------
(gdb) list *0x8048636
0x8048636 is in error_2 (main.c:41).
36
37
38 void error_2(char * p)
39 {
40 invalide_pointer_error(p);
41 }
42
43 void error_1(char * p)
44 {
45 error_2(p);
--------------
(gdb) list *0x8048649
0x8048649 is in error_1 (main.c:46).
41 }
42
43 void error_1(char * p)
44 {
45 error_2(p);
46 }
47
48 void error_0(char * p)
49 {
50 error_1(p);

=============
(gdb) br main.c:40
Breakpoint 1 at 0x804862b: file main.c, line 40.
(gdb) run
Starting program: /home/widebright/桌面/a.out

Breakpoint 1, error_2 (p=0x0) at main.c:40
40 invalide_pointer_error(p);
(gdb) stepi
0x0804862e 40 invalide_pointer_error(p);
(gdb) stepi
0x08048631 40 invalide_pointer_error(p);
(gdb) stepi
invalide_pointer_error (p=0x0) at main.c:32
32 {
(gdb) stepi
0x08048616 32 {
(gdb) stepi
33 *p = 'd'; //让这里出现一个访问非法指针的错误
(gdb) stepi
0x0804861b 33 *p = 'd'; //让这里出现一个访问非法指针的错误
(gdb) stepi

Program received signal SIGSEGV, Segmentation fault.
0x0804861b in invalide_pointer_error (p=0x0) at main.c:33
33 *p = 'd'; //让这里出现一个访问非法指针的错误

(gdb) print p
$1 = 0x0
(gdb) print *p
Cannot access memory at address 0x0

 


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