LXR linux/tools/lib/api/fd/array.h

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