尝试将内存分配给结构元素时收到分段错误错误

Question

typedef struct Node
{
    void ** pointers;
    Value ** keys;
    struct Node * parent;
    bool is_leaf;
    int num_keys;
    struct Node * next;
 } Node;

typedef struct ScanManager {
    int keyIndex;
    int totalKeys;
    Node * node;
} ScanManager;

当我尝试为我的结构 ScanManager 分配内存时出现错误 "Segmentation fault (core dumped)"。我在写 -

ScanManager * scanmeta = (ScanManager *) malloc(sizeof(ScanManager));

我曾尝试使用 calloc 而不是 malloc，但这没有用。由于我想在我的代码中进一步使用它，我该如何为该结构分配内存？

typedef struct Value {
  DataType dt;
  union v {
    int intV;
    char *stringV;
    float floatV;
    bool boolV;
  } v;
} Value;

另外，我还有一个结构-

typedef struct BT_ScanHandle {
    BTreeHandle *tree;
    void *mgmtData;
} BT_ScanHandle;

我正在如下所述的函数中传递此结构的引用，并尝试在此处访问我的 ScanManager 结构 -

openTreeScan(BT_ScanHandle **handle)
{
    struct ScanManager *scanmeta = malloc (sizeof (struct ScanManager));
    (** handle).mgmtData = scanmeta;

    /* Remaining code */
}

Answer 1

我终于弄清楚了错误。它不在将 space 分配给 ScanManager。相反，我试图初始化 BT_ScanHandle 结构的一些成员，而不为其自身分配内存 space。工作代码是 -

openTreeScan(BT_ScanHandle **handle)
{
    struct ScanManager *scanmeta = malloc(sizeof(ScanManager));
    *handle = malloc(sizeof(BT_ScanHandle)); //Allocating some space
    (*handle)->mgmtData = scanmeta; // Initializing

    /* Remaining code */
}

尝试将内存分配给结构元素时收到分段错误错误

Receiving segmentation fault error when trying to allocate memory to a structure element

c

malloc

struct

pointers

memory-management