select.c File Reference

select filedescriptor handling. More...

#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdbool.h>
#include <errno.h>
#include <osmocom/core/select.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/stat_item.h>
#include <osmocom/core/stats_tcp.h>
#include "../config.h"
#include <sys/select.h>
#include <poll.h>
#include <sys/timerfd.h>
#include <sys/signalfd.h>

Data Structures
struct	poll_state

Functions
void	osmo_fd_setup (struct osmo_fd *ofd, int fd, unsigned int when, int(*cb)(struct osmo_fd *fd, unsigned int what), void *data, unsigned int priv_nr)
	Set up an osmo-fd.
void	osmo_fd_update_when (struct osmo_fd *ofd, unsigned int when_mask, unsigned int when)
	Update the 'when' field of osmo_fd.
bool	osmo_fd_is_registered (struct osmo_fd *fd)
	Check if a file descriptor is already registered.
int	osmo_fd_register (struct osmo_fd *fd)
	Register a new file descriptor with select loop abstraction.
void	osmo_fd_unregister (struct osmo_fd *fd)
	Unregister a file descriptor from select loop abstraction.
void	osmo_fd_close (struct osmo_fd *fd)
	Close a file descriptor, mark it as closed + unregister from select loop abstraction.
int	osmo_fd_fill_fds (void *_rset, void *_wset, void *_eset)
	Populate the fd_sets and return the highest fd number.
int	osmo_fd_disp_fds (void *readset, void *writeset, void *exceptset)
static unsigned int	poll_fill_fds (void)
static int	poll_disp_fds (unsigned int n_fd)
static int	_osmo_select_main (int polling)
int	osmo_select_main (int polling)
	select main loop integration
int	osmo_select_main_ctx (int polling)
	select main loop integration with temporary select-dispatch talloc context
struct osmo_fd *	osmo_fd_get_by_fd (int fd)
	find an osmo_fd based on the integer fd
void	osmo_select_init (void)
	initialize the osmocom select abstraction for the current thread
static	__attribute__ ((constructor))
int	osmo_timerfd_disable (struct osmo_fd *ofd)
	disable the osmocom-wrapped timerfd
int	osmo_timerfd_schedule (struct osmo_fd *ofd, const struct timespec *first, const struct timespec *interval)
	schedule the osmocom-wrapped timerfd to occur first at first, then periodically at interval
int	osmo_timerfd_setup (struct osmo_fd *ofd, int(*cb)(struct osmo_fd *, unsigned int), void *data)
	setup osmocom-wrapped timerfd
static int	signalfd_callback (struct osmo_fd *ofd, unsigned int what)
struct osmo_signalfd *	osmo_signalfd_setup (void *ctx, sigset_t set, osmo_signalfd_cb *cb, void *data)
	create a signalfd and register it with osmocom select loop.
void	osmo_select_shutdown_request ()
	Request osmo_select_* to only service pending OSMO_FD_WRITE requests.
int	osmo_select_shutdown_requested ()
	Return the number of times osmo_select_shutdown_request() was called before.
bool	osmo_select_shutdown_done ()
	Return true after osmo_select_shutdown_requested() was called, and after an osmo_select poll loop found no more pending OSMO_FD_WRITE on any registered socket.

Variables
static __thread int	maxfd = 0
static __thread struct llist_head	osmo_fds
static __thread int	unregistered_count
static __thread struct poll_state	g_poll
static int	_osmo_select_shutdown_requested = 0
	See osmo_select_shutdown_request()
static bool	_osmo_select_shutdown_done = false
	See osmo_select_shutdown_request()

Detailed Description

select filedescriptor handling.

Taken from: userspace logging daemon for the iptables ULOG target of the linux 2.4 netfilter subsystem.