headers/posix/sys/select.h

   1 /*
   2  * Copyright 2002-2012 Haiku, Inc. All Rights Reserved.
   3  * Distributed under the terms of the MIT License.
   4  */
   5 #ifndef _SYS_SELECT_H
   6 #define _SYS_SELECT_H
   7
   8
   9 #include <config/types.h>
  10
  11 #include <sys/time.h>
  12 #include <signal.h>
  13
  14
  15 /* If FD_SET is already defined, only the select() prototype is
  16  * exported in this header.
  17  */
  18 #ifndef FD_SET
  19
  20 /* You can define your own FDSETSIZE if you need more bits - but
  21  * it should be enough for most uses.
  22  */
  23 #ifndef FD_SETSIZE
  24 #       define FD_SETSIZE 1024
  25 #endif
  26
  27 typedef __haiku_uint32 fd_mask;
  28
  29 #ifndef _howmany
  30 #       define _howmany(x, y) (((x) + ((y) - 1)) / (y))
  31 #endif
  32
  33 #ifndef howmany
  34 #       define howmany(x, y) (((x) + ((y) - 1)) / (y))
  35 #endif
  36
  37 #define NFDBITS (sizeof(fd_mask) * 8)   /* bits per mask */
  38
  39 typedef struct fd_set {
  40         fd_mask bits[_howmany(FD_SETSIZE, NFDBITS)];
  41 } fd_set;
  42
  43 #define _FD_BITSINDEX(fd) ((fd) / NFDBITS)
  44 #define _FD_BIT(fd) (1L << ((fd) % NFDBITS))
  45
  46 /* FD_ZERO uses memset */
  47 #include <string.h>
  48
  49 #define FD_ZERO(set) memset((set), 0, sizeof(fd_set))
  50 #define FD_SET(fd, set) ((set)->bits[_FD_BITSINDEX(fd)] |= _FD_BIT(fd))
  51 #define FD_CLR(fd, set) ((set)->bits[_FD_BITSINDEX(fd)] &= ~_FD_BIT(fd))
  52 #define FD_ISSET(fd, set) ((set)->bits[_FD_BITSINDEX(fd)] & _FD_BIT(fd))
  53 #define FD_COPY(source, target) (*(target) = *(source))
  54
  55 #endif  /* FD_SET */
  56
  57 #ifdef __cplusplus
  58 extern "C" {
  59 #endif
  60
  61 extern int pselect(int numBits, struct fd_set *readBits, struct fd_set *writeBits,
  62                         struct fd_set *errorBits, const struct timespec *timeout, const sigset_t *sigMask);
  63 extern int select(int numBits, struct fd_set *readBits, struct fd_set *writeBits,
  64                         struct fd_set *errorBits, struct timeval *timeout);
  65
  66 #ifdef __cplusplus
  67 }
  68 #endif
  69
  70 #endif  /* _SYS_SELECT_H */