#include <event2/visibility.h>
Go to the source code of this file.
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typedef void(* | evbuffer_cb) (struct evbuffer *buffer, size_t old_len, size_t new_len, void *arg) |
| Type definition for a callback that is invoked whenever data is added or removed from an evbuffer. More...
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Obsolete and deprecated versions of the functions in buffer.h: provided only for backward compatibility.
◆ evbuffer_cb
typedef void(* evbuffer_cb) (struct evbuffer *buffer, size_t old_len, size_t new_len, void *arg) |
Type definition for a callback that is invoked whenever data is added or removed from an evbuffer.
An evbuffer may have one or more callbacks set at a time. The order in which they are executed is undefined.
A callback function may add more callbacks, or remove itself from the list of callbacks, or add or remove data from the buffer. It may not remove another callback from the list.
If a callback adds or removes data from the buffer or from another buffer, this can cause a recursive invocation of your callback or other callbacks. If you ask for an infinite loop, you might just get one: watch out!
- Parameters
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buffer | the buffer whose size has changed |
old_len | the previous length of the buffer |
new_len | the current length of the buffer |
arg | a pointer to user data |
◆ evbuffer_find()
EVENT2_EXPORT_SYMBOL unsigned char* evbuffer_find |
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struct evbuffer * |
buffer, |
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const unsigned char * |
what, |
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size_t |
len |
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) |
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Find a string within an evbuffer.
- Parameters
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buffer | the evbuffer to be searched |
what | the string to be searched for |
len | the length of the search string |
- Returns
- a pointer to the beginning of the search string, or NULL if the search failed.
◆ evbuffer_readline()
EVENT2_EXPORT_SYMBOL char* evbuffer_readline |
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struct evbuffer * |
buffer | ) |
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Obsolete alias for evbuffer_readln(buffer, NULL, EVBUFFER_EOL_ANY).
- Deprecated:
- This function is deprecated because its behavior is not correct for almost any protocol, and also because it's wholly subsumed by evbuffer_readln().
- Parameters
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buffer | the evbuffer to read from |
- Returns
- pointer to a single line, or NULL if an error occurred
◆ evbuffer_setcb()
EVENT2_EXPORT_SYMBOL void evbuffer_setcb |
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struct evbuffer * |
buffer, |
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evbuffer_cb |
cb, |
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void * |
cbarg |
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) |
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Replace all callbacks on an evbuffer with a single new callback, or remove them.
Subsequent calls to evbuffer_setcb() replace callbacks set by previous calls. Setting the callback to NULL removes any previously set callback.
- Deprecated:
- This function is deprecated because it clears all previous callbacks set on the evbuffer, which can cause confusing behavior if multiple parts of the code all want to add their own callbacks on a buffer. Instead, use evbuffer_add(), evbuffer_del(), and evbuffer_setflags() to manage your own evbuffer callbacks without interfering with callbacks set by others.
- Parameters
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buffer | the evbuffer to be monitored |
cb | the callback function to invoke when the evbuffer is modified, or NULL to remove all callbacks. |
cbarg | an argument to be provided to the callback function |