c++ - memcpy() 给我段错误

Question

我的程序是一个 OpenGL 程序，当我不使用 memcopy 时编译和运行良好，但是当在程序中使用这个函数时，当我尝试在编译后运行程序时它给我一个段错误，它仍然编译案例，但是当我用这个函数编译程序时给我 seg 错误，并且在 gdb 中检查时的 seg 错误没有显示 memcpy 作为问题而是一个初始化函数 init() 为我创建了 opengl 上下文，但奇怪的是是只有当我在程序中包含 memcpy 并编译它时才会发生，否则 init() 工作正常，我还在另一个文件中测试它以确认它自己工作

我不知道为什么会这样，我确实注意到自从 linux mint 升级了一些软件包后就发生了这种情况，程序在升级前运行良好

这是程序源码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <GL/glew.h>
#include <GL/glx.h>

#include <time.h>
#include <math.h>

#include "glx2.c"
#include "renderBuffer.h"
#include "new.hpp"

#define WIDTH 1080 
#define HEIGHT 720

int main(){

   init(WIDTH,HEIGHT);
   createShaders();

   char name[1][25];

   float returned[720][1080][2] = {0.0f};


   strcpy(name[0],"ryu2.bmp");

   GLuint frameBuffer = createFramebuffer(frameBuffer);

   GLuint renderTexture = createRenderTexture(renderTexture, WIDTH,HEIGHT);
   //GLuint depth_texture;

   //glGenTextures(1, &depth_texture);
   //glBindTexture(GL_TEXTURE_2D, depth_texture);
   //glTexStorage2D(GL_TEXTURE_2D, 1, GL_DEPTH_COMPONENT32F, 1080, 720);

   //glFramebufferTexture(GL_FRAMEBUFFER,GL_DEPTH_ATTACHMENT,depth_texture, 0);

   glFramebufferTexture(GL_FRAMEBUFFER,GL_COLOR_ATTACHMENT0,renderTexture,0);

   static const GLenum draw_buffers[] = { GL_COLOR_ATTACHMENT0 };
   glDrawBuffers(1, draw_buffers);


   //bind framebuffer 
   glBindFramebuffer(GL_FRAMEBUFFER,frameBuffer);
   checkFramebuffer();

   GLfloat vertices[] = { 

   //   
   //  X      Y                  U            V
   //triangle 1
     -1.0,       -1.0,          0.0,         0.0,
     -22.0/27.0, -1.0,          100.0/800.0, 0.0,
     -1.0,       -41.0/60.0,    0.0,         114.0/342.0,
     -22.0/27.0, -41.0/60.0,    100.0/800.0, 114.0/342.0};   


   GLuint vao1 = createVao();
   GLuint vbo1 = createVbo();

   glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);  

   GLuint tex = createTexture(name[0]);

   //set up data format in opengl and save in vao
   glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*sizeof(GLfloat), 0);
   glEnableVertexAttribArray(0);

   glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4*sizeof(GLfloat), (const GLvoid*)(2 * sizeof(GLfloat)));
   glEnableVertexAttribArray(1);


   bindObject(vao1, tex);

   glBindFramebuffer(GL_FRAMEBUFFER, frameBuffer);
   glViewport(0,0, WIDTH,HEIGHT);

   glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

   //////completed drawing to framebuffer original values 

   glBindFramebuffer(GL_FRAMEBUFFER,0);

   glBindTexture(GL_TEXTURE_2D, renderTexture);

   glGetTexImage(GL_TEXTURE_2D, 0,GL_RG,GL_FLOAT,(void *)&returned);

   float another[720][1080][2];

   memcpy((void *)another, (const void *)returned, sizeof(returned));
   //----------------------completed copying original values to array for all comparison

   int i = 0,j=0;

   //for(j=0; j<114;j++)
   //   for(i=0; i<100;i++){   
         //printf("%f %f\n",another[j][i][0], another[j][i][1]);
   //}



   //from this point on there will be change and comparison

   //GLuint disp = glGetUniformLocation(shader_program, "disp");

   //glUniform2f(disp, 1.0/540,1.0/360);




   glXMakeCurrent( dpy, 0, 0 );
   glXDestroyContext( dpy, ctx );
   glXDestroyWindow(dpy, glxWin);
   XDestroyWindow( dpy, win );
   XFreeColormap( dpy, cmap );
   XCloseDisplay( dpy );

    return 0;

}

当我运行 gdb 时，这是它给出的问题，尽管当我注释掉 memcpy 时它工作正常并且没有给我任何段错误

Program received signal SIGSEGV, Segmentation fault.
0x0000000000402876 in main () at untitled.cpp:22
22     init(WIDTH,HEIGHT);
(gdb) 

Answer 1

@BarmakShemirani 指出的答案是 linux 的堆栈限制为 8mb，并且由于两个数组加在一起超过 12mb，因此会覆盖堆栈，因此问题发生在我身上，解决方案是写入/用 malloc() 代替分配给堆