tools/lib/api/fd/array.h

   1 #ifndef __API_FD_ARRAY__
   2 #define __API_FD_ARRAY__
   3
   4 #include <stdio.h>
   5
   6 struct 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  */
  18 struct fdarray {
  19         int            nr;
  20         int            nr_alloc;
  21         int            nr_autogrow;
  22         struct pollfd *entries;
  23         union {
  24                 int    idx;
  25         } *priv;
  26 };
  27
  28 void fdarray__init(struct fdarray *fda, int nr_autogrow);
  29 void fdarray__exit(struct fdarray *fda);
  30
  31 struct fdarray *fdarray__new(int nr_alloc, int nr_autogrow);
  32 void fdarray__delete(struct fdarray *fda);
  33
  34 int fdarray__add(struct fdarray *fda, int fd, short revents);
  35 int fdarray__poll(struct fdarray *fda, int timeout);
  36 int fdarray__filter(struct fdarray *fda, short revents,
  37                     void (*entry_destructor)(struct fdarray *fda, int fd));
  38 int fdarray__grow(struct fdarray *fda, int extra);
  39 int fdarray__fprintf(struct fdarray *fda, FILE *fp);
  40
  41 static inline int fdarray__available_entries(struct fdarray *fda)
  42 {
  43         return fda->nr_alloc - fda->nr;
  44 }
  45
  46 #endif /* __API_FD_ARRAY__ */