summaryrefslogtreecommitdiffstats
path: root/include/osmocom/core/select.h
blob: 9b5f372bf6bd37a98876a6e689ed7c9c16ef27fe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
/*! \file select.h
 *  select loop abstraction.
 */

#pragma once

#include <osmocom/core/linuxlist.h>
#include <stdbool.h>

/*! \defgroup select Select loop abstraction
 *  @{
 * \file select.h */

/*! Indicate interest in reading from the file descriptor */
#define BSC_FD_READ	0x0001
/*! Indicate interest in writing to the file descriptor */
#define BSC_FD_WRITE	0x0002
/*! Indicate interest in exceptions from the file descriptor */
#define BSC_FD_EXCEPT	0x0004

/*! 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 BSC_FD_READ, \ref BSC_FD_WRITE and/or
	 * \ref BSC_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;
};

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);
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);

/*! @} */