gp_poll.h File Reference

A simple epoll wrapper. More...

#include <utils/gp_types.h>
#include <utils/gp_list.h>

Go to the source code of this file.

Data Structures
struct	gp_poll
	An epoll instance. More...
struct	gp_fd
	An epoll file descriptor. More...

Typedefs
typedef struct gp_poll	gp_poll
	An epoll instance.

Enumerations
enum	gp_poll_events {   GP_POLLIN = 0x01 , GP_POLLPRI = 0x02 , GP_POLLOUT = 0x04 , GP_POLLERR = 0x08 ,   GP_POLLHUP = 0x10 }
	A gp_epoll flags. More...
enum	gp_poll_event_ret { GP_POLL_RET_OK = 0 , GP_POLL_RET_REM = 1 }
	A return value from the event() callback. More...

Functions
void	gp_poll_clear (gp_poll *self)
	Removes all file descriptors from the poll.
int	gp_poll_add (gp_poll *self, gp_fd *fd)
	Adds a file descriptor.
int	gp_poll_rem (gp_poll *self, gp_fd *fd)
	Removes a file descriptor.
gp_fd *	gp_poll_rem_by_fd (gp_poll *self, int fd)
	Looks up and removes a gp_fd by a fd.
int	gp_poll_wait (gp_poll *self, int timeout_ms)
	A wrapper around the poll().
static size_t	gp_poll_fds (gp_poll *self)
	Returns a number of fds in the poll instance.

Detailed Description

A simple epoll wrapper.

Definition in file gp_poll.h.

Enumeration Type Documentation

gp_poll_event_ret

enum gp_poll_event_ret

A return value from the event() callback.

Enumerator
GP_POLL_RET_OK	Processing datat was fine
GP_POLL_RET_REM	Remove the fd from the epoll list

Definition at line 56 of file gp_poll.h.

gp_poll_events

enum gp_poll_events

A gp_epoll flags.

This maps 1:1 to epoll and poll

Enumerator
GP_POLLIN	There are data to read
GP_POLLPRI	There is exceptional condition on the fd
GP_POLLOUT	Writing is now possible
GP_POLLERR	Error condition has happended
GP_POLLHUP	Hang up

Definition at line 24 of file gp_poll.h.

Function Documentation

gp_poll_add()

int gp_poll_add	(	gp_poll *	self,
		gp_fd *	fd
	)

Adds a file descriptor.

Parameters

self	The gp_poll struct.
fd	A struct gp_fd filled in by the user.

Returns

0 on success and -1 if the underlying epoll() call failed.

Referenced by gp_backend_poll_add().

gp_poll_clear()

void gp_poll_clear

(

gp_poll *

self

)

Removes all file descriptors from the poll.

Parameters

self	The gp_poll struct.

gp_poll_fds()

static size_t gp_poll_fds ( gp_poll *  self )

inlinestatic

Returns a number of fds in the poll instance.

Parameters

self	The fds struct.

Returns

Number of fds in the queue.

Definition at line 152 of file gp_poll.h.

References gp_dlist::cnt, and gp_poll::fds.

gp_poll_rem()

int gp_poll_rem	(	gp_poll *	self,
		gp_fd *	fd
	)

Removes a file descriptor.

Parameters

self	The poll struct.
fd	File descriptor to be removed.

Returns

0 on success and -1 if fd is not in fds.

Referenced by gp_backend_poll_rem().

gp_poll_rem_by_fd()

gp_fd * gp_poll_rem_by_fd	(	gp_poll *	self,
		int	fd
	)

Looks up and removes a gp_fd by a fd.

Parameters

self	The poll struct.
fd	A file descriptor for the lookup.

Returns

A gp_fd if found or NULL.

Referenced by gp_backend_poll_rem_by_fd().

gp_poll_wait()

int gp_poll_wait	(	gp_poll *	self,
		int	timeout_ms
	)

A wrapper around the poll().

Polls for file descriptors added by the gp_fds_add() function, calls event() callback for each fd if events are returned.

Parameters

self	The fds struct.
timeout_ms	Timeout passed to poll().

Returns

A zero on success, -1 otherwise.