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	struct priv {
25		union {
26			int    idx;
27			void   *ptr;
28		};
29		unsigned int flags;
30	} *priv;
31};
32
33enum fdarray_flags {
34	fdarray_flag__default		= 0x00000000,
35	fdarray_flag__nonfilterable	= 0x00000001,
36	fdarray_flag__non_perf_event	= 0x00000002,
37};
38
39void fdarray__init(struct fdarray *fda, int nr_autogrow);
40void fdarray__exit(struct fdarray *fda);
41
42struct fdarray *fdarray__new(int nr_alloc, int nr_autogrow);
43void fdarray__delete(struct fdarray *fda);
44
45int fdarray__add(struct fdarray *fda, int fd, short revents, enum fdarray_flags flags);
46int fdarray__dup_entry_from(struct fdarray *fda, int pos, struct fdarray *from);
47int fdarray__poll(struct fdarray *fda, int timeout);
48int fdarray__filter(struct fdarray *fda, short revents,
49		    void (*entry_destructor)(struct fdarray *fda, int fd, void *arg),
50		    void *arg);
51int fdarray__grow(struct fdarray *fda, int extra);
52int fdarray__fprintf(struct fdarray *fda, FILE *fp);
53
54static inline int fdarray__available_entries(struct fdarray *fda)
55{
56	return fda->nr_alloc - fda->nr;
57}
58
59#endif /* __API_FD_ARRAY__ */

 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	struct priv {
25		union {
26			int    idx;
27			void   *ptr;
28		};
29		unsigned int flags;
30	} *priv;
31};
32
33enum fdarray_flags {
34	fdarray_flag__default		= 0x00000000,
35	fdarray_flag__nonfilterable	= 0x00000001,
36	fdarray_flag__non_perf_event	= 0x00000002,
37};
38
39void fdarray__init(struct fdarray *fda, int nr_autogrow);
40void fdarray__exit(struct fdarray *fda);
41
42struct fdarray *fdarray__new(int nr_alloc, int nr_autogrow);
43void fdarray__delete(struct fdarray *fda);
44
45int fdarray__add(struct fdarray *fda, int fd, short revents, enum fdarray_flags flags);
46int fdarray__dup_entry_from(struct fdarray *fda, int pos, struct fdarray *from);
47int fdarray__poll(struct fdarray *fda, int timeout);
48int fdarray__filter(struct fdarray *fda, short revents,
49		    void (*entry_destructor)(struct fdarray *fda, int fd, void *arg),
50		    void *arg);
51int fdarray__grow(struct fdarray *fda, int extra);
52int fdarray__fprintf(struct fdarray *fda, FILE *fp);
53
54static inline int fdarray__available_entries(struct fdarray *fda)
55{
56	return fda->nr_alloc - fda->nr;
57}
58
59#endif /* __API_FD_ARRAY__ */