1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __API_FD_ARRAY__
3 #define __API_FD_ARRAY__
4
5 #include <stdio.h>
6
7 struct 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 */
19 struct fdarray {
20 int nr;
21 int nr_alloc;
22 int nr_autogrow;
23 struct pollfd *entries;
24 struct priv {
25 union {
26 int idx;
27 void *ptr;
28 };
29 unsigned int flags;
30 } *priv;
31 };
32
33 enum fdarray_flags {
34 fdarray_flag__default = 0x00000000,
35 fdarray_flag__nonfilterable = 0x00000001,
36 fdarray_flag__non_perf_event = 0x00000002,
37 };
38
39 void fdarray__init(struct fdarray *fda, int nr_autogrow);
40 void fdarray__exit(struct fdarray *fda);
41
42 struct fdarray *fdarray__new(int nr_alloc, int nr_autogrow);
43 void fdarray__delete(struct fdarray *fda);
44
45 int fdarray__add(struct fdarray *fda, int fd, short revents, enum fdarray_flags flags);
46 int fdarray__dup_entry_from(struct fdarray *fda, int pos, struct fdarray *from);
47 int fdarray__poll(struct fdarray *fda, int timeout);
48 int fdarray__filter(struct fdarray *fda, short revents,
49 void (*entry_destructor)(struct fdarray *fda, int fd, void *arg),
50 void *arg);
51 int fdarray__grow(struct fdarray *fda, int extra);
52 int fdarray__fprintf(struct fdarray *fda, FILE *fp);
53
54 static inline int fdarray__available_entries(struct fdarray *fda)
55 {
56 return fda->nr_alloc - fda->nr;
57 }
58
59 #endif /* __API_FD_ARRAY__ */
60
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