linux heapdump_oracle dump函数

#include

#include

#include

#include

//http://androidxref.com/7.1.1_r6/xref/external/avahi/avahi-compat-howl/text-test.c#33

static void hexdump(const void* p, size_t size) {

const uint8_t *c = p;

assert(p);

printf(“Dumping %u bytes from %p:\n”, size, p);

while (size > 0) {

unsigned i;

for (i = 0; i < 16; i++) {

if (i < size)

printf(“%02x “, c[i]);

else

printf(” “);

}

for (i = 0; i < 16; i++) {

if (i < size)

printf(“%c”, c[i] >= 32 && c[i] < 127 ? c[i] : ‘.’);

else

printf(” “);

}

printf(“\n”);

c += 16;

if (size <= 16)

break;

size -= 16;

}

}

//默认8的倍数对齐 4+1+10=15=>16

typedef struct Person

{

int age;

char sex;

char city[10];

} Person;

//默认8的倍数对齐 4+4+10=18=>24

typedef struct Student2

{

Person* parent; //4 //存在指针到文件中的话，指针对应的数据会丢失，因为你只存储了他的地址，没有保存他的数据

int weight;//4

char classroom[10];//10+6

} Student2;

int main(void)

{

Person person;

person.age=26;

person.sex=’m’;

strcpy(person.city,”shenzhen”);

hexdump(&person,sizeof(person));

Student2 stu;

stu.parent=&person;//16

stu.weight=140;

memset(stu.classroom,0,sizeof(stu.classroom));//清零，否则是随机值

strcpy(stu.classroom,”204″);

hexdump(&stu,sizeof(stu));

FILE* fp=fopen(“student2.struct.bin”,”wb”);

fwrite(&stu,sizeof(stu),1,fp);

fclose(fp);

printf(“write_Student2_struct sizeof=%d ok!\n”,sizeof(stu));//24

printf(“Hello World!\n”);

return 0;

}