1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef __API_FD_ARRAY__
3*4882a593Smuzhiyun #define __API_FD_ARRAY__
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <stdio.h>
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun struct pollfd;
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun /**
10*4882a593Smuzhiyun * struct fdarray: Array of file descriptors
11*4882a593Smuzhiyun *
12*4882a593Smuzhiyun * @priv: Per array entry priv area, users should access just its contents,
13*4882a593Smuzhiyun * not set it to anything, as it is kept in synch with @entries, being
14*4882a593Smuzhiyun * realloc'ed, * for instance, in fdarray__{grow,filter}.
15*4882a593Smuzhiyun *
16*4882a593Smuzhiyun * I.e. using 'fda->priv[N].idx = * value' where N < fda->nr is ok,
17*4882a593Smuzhiyun * but doing 'fda->priv = malloc(M)' is not allowed.
18*4882a593Smuzhiyun */
19*4882a593Smuzhiyun struct fdarray {
20*4882a593Smuzhiyun int nr;
21*4882a593Smuzhiyun int nr_alloc;
22*4882a593Smuzhiyun int nr_autogrow;
23*4882a593Smuzhiyun struct pollfd *entries;
24*4882a593Smuzhiyun struct priv {
25*4882a593Smuzhiyun union {
26*4882a593Smuzhiyun int idx;
27*4882a593Smuzhiyun void *ptr;
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun unsigned int flags;
30*4882a593Smuzhiyun } *priv;
31*4882a593Smuzhiyun };
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun enum fdarray_flags {
34*4882a593Smuzhiyun fdarray_flag__default = 0x00000000,
35*4882a593Smuzhiyun fdarray_flag__nonfilterable = 0x00000001
36*4882a593Smuzhiyun };
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun void fdarray__init(struct fdarray *fda, int nr_autogrow);
39*4882a593Smuzhiyun void fdarray__exit(struct fdarray *fda);
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun struct fdarray *fdarray__new(int nr_alloc, int nr_autogrow);
42*4882a593Smuzhiyun void fdarray__delete(struct fdarray *fda);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun int fdarray__add(struct fdarray *fda, int fd, short revents, enum fdarray_flags flags);
45*4882a593Smuzhiyun int fdarray__poll(struct fdarray *fda, int timeout);
46*4882a593Smuzhiyun int fdarray__filter(struct fdarray *fda, short revents,
47*4882a593Smuzhiyun void (*entry_destructor)(struct fdarray *fda, int fd, void *arg),
48*4882a593Smuzhiyun void *arg);
49*4882a593Smuzhiyun int fdarray__grow(struct fdarray *fda, int extra);
50*4882a593Smuzhiyun int fdarray__fprintf(struct fdarray *fda, FILE *fp);
51*4882a593Smuzhiyun
fdarray__available_entries(struct fdarray * fda)52*4882a593Smuzhiyun static inline int fdarray__available_entries(struct fdarray *fda)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun return fda->nr_alloc - fda->nr;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun #endif /* __API_FD_ARRAY__ */
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