Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __API_FD_ARRAY__
3#define __API_FD_ARRAY__
4
5#include <stdio.h>
6
7struct pollfd;
8
9/**
10 * struct fdarray: Array of file descriptors
11 *
12 * @priv: Per array entry priv area, users should access just its contents,
13 * not set it to anything, as it is kept in synch with @entries, being
14 * realloc'ed, * for instance, in fdarray__{grow,filter}.
15 *
16 * I.e. using 'fda->priv[N].idx = * value' where N < fda->nr is ok,
17 * but doing 'fda->priv = malloc(M)' is not allowed.
18 */
19struct fdarray {
20 int nr;
21 int nr_alloc;
22 int nr_autogrow;
23 struct pollfd *entries;
24 union {
25 int idx;
26 void *ptr;
27 } *priv;
28};
29
30void fdarray__init(struct fdarray *fda, int nr_autogrow);
31void fdarray__exit(struct fdarray *fda);
32
33struct fdarray *fdarray__new(int nr_alloc, int nr_autogrow);
34void fdarray__delete(struct fdarray *fda);
35
36int fdarray__add(struct fdarray *fda, int fd, short revents);
37int fdarray__poll(struct fdarray *fda, int timeout);
38int fdarray__filter(struct fdarray *fda, short revents,
39 void (*entry_destructor)(struct fdarray *fda, int fd, void *arg),
40 void *arg);
41int fdarray__grow(struct fdarray *fda, int extra);
42int fdarray__fprintf(struct fdarray *fda, FILE *fp);
43
44static inline int fdarray__available_entries(struct fdarray *fda)
45{
46 return fda->nr_alloc - fda->nr;
47}
48
49#endif /* __API_FD_ARRAY__ */