backtrace获取堆栈

#include <stdio.h>
#include <unistd.h>
#include <stdio.h>
#include <execinfo.h>
#include <stdlib.h>
#include <string.h>
void backtrace()
{
    const int maxLevel = 200;
    void* buffer[maxLevel];
    int level = backtrace(buffer, maxLevel);
    const int SIZE = 1024;
    char cmd[SIZE] = "addr2line -C -f -e ";

    char* prog = cmd + strlen(cmd);

    int r = readlink("/proc/self/exe", prog, sizeof(cmd) - (prog-cmd)-1);

    FILE* fp = popen(cmd, "w");
    if (!fp)
    {
        perror("popen");
        return;
    }
    for (int i = 0; i < level; ++i)
    {
        fprintf(fp, "%p\n", buffer[i]);
    }
    fclose(fp);
}


void foo(int, char*)
{
    backtrace();
}
void bar(double)
{
    foo(0, NULL);
}

int main()
{
    bar(0.0);
    return 0;
}