poll.h 2.6 KB

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  1. /* Compatibility definitions for System V `poll' interface.
  2. Copyright (C) 1994,1996-2001,2004,2005,2006 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. #ifdef __USE_GNU
  22. /* Get the __sigset_t definition. */
  23. # include <bits/sigset.h>
  24. /* Get the timespec definition. */
  25. # define __need_timespec
  26. # include <time.h>
  27. /* get NULL definition. */
  28. # include <stddef.h>
  29. #endif
  30. /* Type used for the number of file descriptors. */
  31. typedef unsigned long int nfds_t;
  32. /* Data structure describing a polling request. */
  33. struct pollfd
  34. {
  35. int fd; /* File descriptor to poll. */
  36. short int events; /* Types of events poller cares about. */
  37. short int revents; /* Types of events that actually occurred. */
  38. };
  39. __BEGIN_DECLS
  40. /* Poll the file descriptors described by the NFDS structures starting at
  41. FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
  42. an event to occur; if TIMEOUT is -1, block until an event occurs.
  43. Returns the number of file descriptors with events, zero if timed out,
  44. or -1 for errors.
  45. This function is a cancellation point and therefore not marked with
  46. __THROW. */
  47. extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout);
  48. #if defined __USE_GNU && defined __UCLIBC_LINUX_SPECIFIC__
  49. /* Like poll, but before waiting the threads signal mask is replaced
  50. with that specified in the fourth parameter. For better usability,
  51. the timeout value is specified using a TIMESPEC object.
  52. This function is a cancellation point and therefore not marked with
  53. __THROW. */
  54. extern int ppoll (struct pollfd *__fds, nfds_t __nfds,
  55. __const struct timespec *__timeout,
  56. __const __sigset_t *__ss);
  57. #endif
  58. __END_DECLS
  59. #endif /* sys/poll.h */