recvfrom():: Bad address

This is a discussion on recvfrom():: Bad address within the C Programming forums, part of the General Programming Boards category; Im not sure if you need more code but Code: struct Ethfrm_t { struct FCfrm_t* ptr; unsigned char DestEthAdr[6]; unsigned ...

  1. #1
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    recvfrom():: Bad address

    Im not sure if you need more code but
    Code:
     
    struct Ethfrm_t
    {
    	struct FCfrm_t* ptr;
    	unsigned char DestEthAdr[6];
    	unsigned char SrcEthAdr[6];
    	UINT32  VLAN_HdrSave;
    	//unsigned char  reserved[4];
    	void* buffer;
    }  __attribute__ ((packed));
    
    Ethfrm_t* Ethfrm;
    Ethfrm = malloc(sizeof(Ethfrm));
    
    Ethfrm->buffer = (void*)malloc(BUF_SIZE); 	/*Buffer for Ethernet Frame*/
    
    length = recvfrom(s, Ethfrm->buffer, BUF_SIZE, 0, NULL, NULL);
    
    		if (length == -1) {
    
    			perror("recvfrom():");
    
    			exit(1);
    
    		}
    This works but when i uncomment the unsigned char reserved i get the BAD ADDRESS error after like 2 seconds of the server running Im not really sure what that means or how to fix it?

  2. #2
    Captain Crash brewbuck's Avatar
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    Quote Originally Posted by kiros88 View Post
    Code:
     
    Ethfrm = malloc(sizeof(Ethfrm));
    Should be

    Code:
    Ethfrm = malloc(sizeof(*Ethfrm));
    You're only allocating a pointer's worth of space.
    Code:
    //try
    //{
    	if (a) do { f( b); } while(1);
    	else   do { f(!b); } while(1);
    //}

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