newlib/libc/include/sys/select.h

   1 #ifndef _SYS_SELECT_H
   2 #define _SYS_SELECT_H
   3
   4 /* We don't define fd_set and friends if we are compiling POSIX
   5    source, or if we have included (or may include as indicated
   6    by __USE_W32_SOCKETS) the W32api winsock[2].h header which
   7    defines Windows versions of them.   Note that a program which
   8    includes the W32api winsock[2].h header must know what it is doing;
   9    it must not call the Cygwin select function.
  10 */
  11 # if !(defined (_WINSOCK_H) || defined (_WINSOCKAPI_) || defined (__USE_W32_SOCKETS))
  12
  13 #include <sys/cdefs.h>
  14 #include <sys/_sigset.h>
  15 #include <sys/_timeval.h>
  16 #include <sys/timespec.h>
  17
  18 #if !defined(_SIGSET_T_DECLARED)
  19 #define _SIGSET_T_DECLARED
  20 typedef __sigset_t      sigset_t;
  21 #endif
  22
  23 #  define _SYS_TYPES_FD_SET
  24 /*
  25  * Select uses bit masks of file descriptors in longs.
  26  * These macros manipulate such bit fields (the filesystem macros use chars).
  27  * FD_SETSIZE may be defined by the user, but the default here
  28  * should be enough for most uses.
  29  */
  30 #ifndef FD_SETSIZE
  31 # ifdef __CYGWIN__
  32 #  define FD_SETSIZE    1024
  33 # elif defined(__rtems__)
  34 #  define FD_SETSIZE    256
  35 # else
  36 #  define FD_SETSIZE    64
  37 # endif
  38 #endif
  39
  40 typedef unsigned long   __fd_mask;
  41 #if __BSD_VISIBLE
  42 typedef __fd_mask       fd_mask;
  43 #endif
  44
  45 #define _NFDBITS        ((int)sizeof(__fd_mask) * 8) /* bits per mask */
  46 #if __BSD_VISIBLE
  47 #define NFDBITS         _NFDBITS
  48 #endif
  49
  50 #ifndef _howmany
  51 #define _howmany(x,y)   (((x) + ((y) - 1)) / (y))
  52 #endif
  53
  54 typedef struct fd_set {
  55         __fd_mask       __fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];
  56 } fd_set;
  57 #if __BSD_VISIBLE
  58 #define fds_bits        __fds_bits
  59 #endif
  60
  61 #define __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS))
  62 #define FD_CLR(n, p)    ((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
  63 #if __BSD_VISIBLE
  64 #define FD_COPY(f, t)   (void)(*(t) = *(f))
  65 #endif
  66 #define FD_ISSET(n, p)  (((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n)) != 0)
  67 #define FD_SET(n, p)    ((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
  68 #define FD_ZERO(p) do {                                 \
  69         fd_set *_p;                                     \
  70         __size_t _n;                                    \
  71                                                         \
  72         _p = (p);                                       \
  73         _n = _howmany(FD_SETSIZE, _NFDBITS);            \
  74         while (_n > 0)                                  \
  75                 _p->__fds_bits[--_n] = 0;               \
  76 } while (0)
  77
  78 #if !defined (__INSIDE_CYGWIN_NET__)
  79
  80 __BEGIN_DECLS
  81
  82 int select __P ((int __n, fd_set *__readfds, fd_set *__writefds,
  83                  fd_set *__exceptfds, struct timeval *__timeout));
  84 #if __POSIX_VISIBLE >= 200112
  85 int pselect __P ((int __n, fd_set *__readfds, fd_set *__writefds,
  86                   fd_set *__exceptfds, const struct timespec *__timeout,
  87                   const sigset_t *__set));
  88 #endif
  89
  90 __END_DECLS
  91
  92 #endif /* !__INSIDE_CYGWIN_NET__ */
  93
  94 #endif /* !(_WINSOCK_H || _WINSOCKAPI_ || __USE_W32_SOCKETS) */
  95
  96 #endif /* sys/select.h */