Added utility function docs

doc/api/httplib_kill.md

@@ -0,0 +1,26 @@
+# LibHTTP API Reference
+
+### `httplib_kill( pid, sig );`
+
+### Parameters
+
+| Parameter | Type | Description |
+| :--- | :--- | :--- |
+|**`pid`**|`pid_t`| The process identifier of the process |
+|**`sig`**|`int`| The signal to be sent to the process |
+
+### Return Value
+
+| Type | Description |
+| :--- | :--- |
+|`int`|An integer which indicates success or failure|
+
+### Description
+
+The function `httplib_kill()` provides a platform independent way to send a signal to a process. The function uses the Postfix `kill()` functions in environments where that function is supported or emulates that function with own code for other operating systems. The function call returns **0** if sending the signal was successful and **-1** otherwise.
+
+Please note that for non Posix-compliant systems the functionality of the Posix `kill()` function has not been fully implemented. Currently only the `SIGKILL` has been implemented and tested fully. For other signals the functionality is unknown and may not lead to the desired results.
+
+### See Also
+
+* [`httplib_poll();`](httplib_poll.md)