使用backtrace和backtrace_symbols打印函数调用链

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代码来源：http://man7.org/linux/man-pages/man3/backtrace.3.html

#include <execinfo.h>#include <stdio.h>#include <stdlib.h>#include <unistd.h>void myfunc3(void){        int j, nptrs;#define SIZE 100        void *buffer[100];        char **strings;        nptrs = backtrace(buffer, SIZE);        printf("backtrace() returned %d addresses\n", nptrs);        /* The call backtrace_symbols_fd(buffer, nptrs, STDOUT_FILENO)         *               would produce similar output to the following: */        strings = backtrace_symbols(buffer, nptrs);        if (strings == NULL) {                perror("backtrace_symbols");                exit(EXIT_FAILURE);        }        for (j = 0; j < nptrs; j++)                printf("%s\n", strings[j]);        free(strings);}static void /* "static" means don't export the symbol... */ myfunc2(void){        myfunc3();}void myfunc(int ncalls){        if (ncalls > 1)                myfunc(ncalls - 1);        else                myfunc2();}int main(int argc, char *argv[]){        if (argc != 2) {                fprintf(stderr, "%s num-calls\n", argv[0]);                exit(EXIT_FAILURE);        }        myfunc(atoi(argv[1]));        exit(EXIT_SUCCESS);}

编译需要带上-rdynamic选项

$ cc -rdynamic prog.c -o prog

运行结果

$ ./prog 3           backtrace() returned 8 addresses           ./prog(myfunc3+0x5c) [0x80487f0]           ./prog [0x8048871]           ./prog(myfunc+0x21) [0x8048894]           ./prog(myfunc+0x1a) [0x804888d]           ./prog(myfunc+0x1a) [0x804888d]           ./prog(main+0x65) [0x80488fb]           /lib/libc.so.6(__libc_start_main+0xdc) [0xb7e38f9c]           ./prog [0x8048711]

注意函数myfunc2使用了static

在编译时候被优化掉了

打印的调用链里没有myfunc2函数

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