如何分配结构的内存？

Question

I am trying to allocate memory and zero it out for the sender struct but I'm not sure if I am doing this correctly. I'm trying to learn how to manage memory in C while I am doing this project. How can I test it to see what I set the memory to? And will what I am trying to do work, or is there a better way of doing this?

typedef unsigned char uchar;

typedef struct {
    uchar Seq;
    uchar Ack;
    uchar Flags;
} Header;

#define FRAME_PAYLOAD_SIZE 50
struct Frame_t
{
    Header header;
    char data[FRAME_PAYLOAD_SIZE];
    uchar CRC;
};
typedef struct Frame_t Frame;

struct Sender
{
    uchar winSize;

    struct sendSlot {
        struct timeval timeout;
        Frame msg;
    } sendQ[5];
};


    initSend(Sender* sender) {
        sender->winSize = -1;

        char* send_buf = (char*) malloc(5 * sizeof(sender->sendQ[0]));
        memset(send_buf, 0, 5 * sizeof(sender->sendQ[0]));
        int i;
        for (i=0; i<sizeof(sender->sendQ)/sizeof(sender->sendQ[0]); i++) {
             memset(sender->sendQ[i].timeout, 0, sizeof(struct timeval));
            sender->sendQ = NULL;
         }
    }

Answer 1

sendQ is an array member of Sender , it is not a pointer. There is no need for allocating memory using malloc . You can use:

initSend(Sender* sender) {
   sender->winSize = -1;
   memset(sender->sendQ, 0, sizeof(sender->sendQ));
}