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/*! \file select.h
* select loop abstraction.
*/
#pragma once
#include <osmocom/core/linuxlist.h>
#include <stdbool.h>
#include <time.h>
/*! \defgroup select Select loop abstraction
* @{
* \file select.h */
/*! Indicate interest in reading from the file descriptor */
#define OSMO_FD_READ 0x0001
/*! Indicate interest in writing to the file descriptor */
#define OSMO_FD_WRITE 0x0002
/*! Indicate interest in exceptions from the file descriptor */
#define OSMO_FD_EXCEPT 0x0004
/* legacy naming dating back to early OpenBSC / bsc_hack of 2008 */
#define BSC_FD_READ OSMO_FD_READ
#define BSC_FD_WRITE OSMO_FD_WRITE
#define BSC_FD_EXCEPT OSMO_FD_EXCEPT
/*! Structure representing a file dsecriptor */
struct osmo_fd {
/*! linked list for internal management */
struct llist_head list;
/*! actual operating-system level file decriptor */
int fd;
/*! bit-mask or of \ref OSMO_FD_READ, \ref OSMO_FD_WRITE and/or
* \ref OSMO_FD_EXCEPT */
unsigned int when;
/*! call-back function to be called once file descriptor becomes
* available */
int (*cb)(struct osmo_fd *fd, unsigned int what);
/*! data pointer passed through to call-back function */
void *data;
/*! private number, extending \a data */
unsigned int priv_nr;
};
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);
bool osmo_fd_is_registered(struct osmo_fd *fd);
int osmo_fd_register(struct osmo_fd *fd);
void osmo_fd_unregister(struct osmo_fd *fd);
void osmo_fd_close(struct osmo_fd *fd);
int osmo_select_main(int polling);
struct osmo_fd *osmo_fd_get_by_fd(int fd);
/*
* foreign event loop integration
*/
int osmo_fd_fill_fds(void *readset, void *writeset, void *exceptset);
int osmo_fd_disp_fds(void *readset, void *writeset, void *exceptset);
/* timerfd integration */
int osmo_timerfd_disable(struct osmo_fd *ofd);
int osmo_timerfd_schedule(struct osmo_fd *ofd, const struct timespec *first,
const struct timespec *interval);
int osmo_timerfd_setup(struct osmo_fd *ofd, int (*cb)(struct osmo_fd *, unsigned int), void *data);
/*! @} */
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