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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 descriptors11 *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, being14 * 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__ */60