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