poll.h 1.8 KB

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  1. /* Compatibility definitions for System V `poll' interface.
  2. Copyright (C) 1994,96,97,98,99,2000,2001 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #ifndef _SYS_POLL_H
  17. #define _SYS_POLL_H 1
  18. #include <features.h>
  19. /* Get the platform dependent bits of `poll'. */
  20. #include <bits/poll.h>
  21. /* Type used for the number of file descriptors. */
  22. typedef unsigned long int nfds_t;
  23. /* Data structure describing a polling request. */
  24. struct pollfd
  25. {
  26. int fd; /* File descriptor to poll. */
  27. short int events; /* Types of events poller cares about. */
  28. short int revents; /* Types of events that actually occurred. */
  29. };
  30. __BEGIN_DECLS
  31. /* Poll the file descriptors described by the NFDS structures starting at
  32. FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
  33. an event to occur; if TIMEOUT is -1, block until an event occurs.
  34. Returns the number of file descriptors with events, zero if timed out,
  35. or -1 for errors. */
  36. extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout) __THROW;
  37. __END_DECLS
  38. #endif /* sys/poll.h */