os_msys_get_pkthdr

struct os_mbuf *os_msys_get_pkthdr(uint16_t dsize, uint16_t user_hdr_len)

Retrieve a packet header mbuf from the system mbuf pools with user_hdr_len bytes available for the user header in the mbuf.

Arguments

Arguments	Description
dsize	Minimum requested size of mbuf. Actual mbuf allocated may not accommodate dsize
user_hdr_len	Size, in of bytes, of user header in the mbuf

Returned values

Pointer to mbuf or NULL if no mbufs were available.

Notes

The same notes apply to this API as to os_msys_get().

Example

    struct os_mbuf *om;
    struct my_user_hdr_struct my_usr_hdr;

    /*
     * Allocate an mbuf with hopefully at least 100 bytes in its user data buffer
     * and that has a user header of size sizeof(struct my_user_hdr_struct)
     */
    om = os_msys_get_pkthdr(100, sizeof(struct my_user_hdr_struct));
    if (!om) {
        /* No mbufs available. */
        return -1;
    }
}