LwIP协议栈的内存管理

case PBUF_POOL: p = memp_malloc(MEMP_PBUF_POOL); case PBUF_RAM: p = (struct pbuf*)mem_malloc(LWIP_MEM_ALIGN_SIZE(SIZEOF_STRUCT_PBUF + offset) + LWIP_MEM_ALIGN_SIZE(length));  case PBUF_ROM:  case PBUF

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