httplib_poll( pfd, nfds, timeout );
Parameters
| Parameter | Type | Description |
|---|---|---|
pfd |
struct pollfd * |
List of file descriptors |
nfds |
unsigned int |
Number of file descriptors |
timeout |
int |
Timeout of the wait in milliseconds |
Return Value
| Type | Description |
|---|---|
int |
The number of descriptors ready for I/O or an error code |
Description
The function httplib_poll() provides a platform independent way to perform asynchronous I/O. A list with file descriptors is provided as parameter to the function call. When one or more file desciptors are ready to provide I/O the function returns with the number of descriptors which are ready. An error is indicated with the value -1. An optional timeout value specifies in milliseconds after which time the function should return, even if no file descriptors are ready. The value -1 as timeout is interpreted as an infinite wait.
On Posix compliant systems the call to this function is just a wrapper around the Posix poll() function. On other systems this function is implemented with own code to emulate the Posix functionality.