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lwip_netbuf.c File Reference
Network buffer management. More...
Go to the source code of this file.
Functions | |
| struct netbuf * | netbuf_new (void) |
| Create (allocate) and initialize a new netbuf. | |
| void | netbuf_delete (struct netbuf *buf) |
| Deallocate a netbuf allocated by netbuf_new(). | |
| void * | netbuf_alloc (struct netbuf *buf, u16_t size) |
| Allocate memory for a packet buffer for a given netbuf. | |
| void | netbuf_free (struct netbuf *buf) |
| Free the packet buffer included in a netbuf. | |
| err_t | netbuf_ref (struct netbuf *buf, const void *dataptr, u16_t size) |
| Let a netbuf reference existing (non-volatile) data. | |
| void | netbuf_chain (struct netbuf *head, struct netbuf *tail) |
| Chain one netbuf to another (. | |
| err_t | netbuf_data (struct netbuf *buf, void **dataptr, u16_t *len) |
| Get the data pointer and length of the data inside a netbuf. | |
| s8_t | netbuf_next (struct netbuf *buf) |
| Move the current data pointer of a packet buffer contained in a netbuf to the next part. | |
| void | netbuf_first (struct netbuf *buf) |
| Move the current data pointer of a packet buffer contained in a netbuf to the beginning of the packet. | |
Detailed Description
Network buffer management.
Definition in file lwip_netbuf.c.
Function Documentation
| void* netbuf_alloc | ( | struct netbuf * | buf, |
| u16_t | size | ||
| ) |
Allocate memory for a packet buffer for a given netbuf.
- Parameters:
-
buf the netbuf for which to allocate a packet buffer size the size of the packet buffer to allocate
- Returns:
- pointer to the allocated memory NULL if no memory could be allocated
Definition at line 107 of file lwip_netbuf.c.
| void netbuf_chain | ( | struct netbuf * | head, |
| struct netbuf * | tail | ||
| ) |
Chain one netbuf to another (.
- See also:
- pbuf_chain)
- Parameters:
-
head the first netbuf tail netbuf to chain after head, freed by this function, may not be reference after returning
Definition at line 174 of file lwip_netbuf.c.
| err_t netbuf_data | ( | struct netbuf * | buf, |
| void ** | dataptr, | ||
| u16_t * | len | ||
| ) |
Get the data pointer and length of the data inside a netbuf.
- Parameters:
-
buf netbuf to get the data from dataptr pointer to a void pointer where to store the data pointer len pointer to an u16_t where the length of the data is stored
- Returns:
- ERR_OK if the information was retreived, ERR_BUF on error.
Definition at line 193 of file lwip_netbuf.c.
| void netbuf_delete | ( | struct netbuf * | buf ) |
Deallocate a netbuf allocated by netbuf_new().
- Parameters:
-
buf pointer to a netbuf allocated by netbuf_new()
Definition at line 87 of file lwip_netbuf.c.
| void netbuf_first | ( | struct netbuf * | buf ) |
Move the current data pointer of a packet buffer contained in a netbuf to the beginning of the packet.
The packet buffer itself is not modified.
- Parameters:
-
buf the netbuf to modify
Definition at line 239 of file lwip_netbuf.c.
| void netbuf_free | ( | struct netbuf * | buf ) |
Free the packet buffer included in a netbuf.
- Parameters:
-
buf pointer to the netbuf which contains the packet buffer to free
Definition at line 131 of file lwip_netbuf.c.
| struct netbuf* netbuf_new | ( | void | ) | [read] |
Create (allocate) and initialize a new netbuf.
The netbuf doesn't yet contain a packet buffer!
- Returns:
- a pointer to a new netbuf NULL on lack of memory
Definition at line 56 of file lwip_netbuf.c.
| s8_t netbuf_next | ( | struct netbuf * | buf ) |
Move the current data pointer of a packet buffer contained in a netbuf to the next part.
The packet buffer itself is not modified.
- Parameters:
-
buf the netbuf to modify
- Returns:
- -1 if there is no next part 1 if moved to the next part but now there is no next part 0 if moved to the next part and there are still more parts
Definition at line 218 of file lwip_netbuf.c.
| err_t netbuf_ref | ( | struct netbuf * | buf, |
| const void * | dataptr, | ||
| u16_t | size | ||
| ) |
Let a netbuf reference existing (non-volatile) data.
- Parameters:
-
buf netbuf which should reference the data dataptr pointer to the data to reference size size of the data
- Returns:
- ERR_OK if data is referenced ERR_MEM if data couldn't be referenced due to lack of memory
Definition at line 150 of file lwip_netbuf.c.
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