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uclibc-ng
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libc
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sysdeps
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linux
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common
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bits
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poll.h

poll.h 2.0 KB
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  1. /* Copyright (C) 1997, 2001, 2006 Free Software Foundation, Inc.
    2. 

  2.    This file is part of the GNU C Library.
    3. 

  3. 

  4.    The GNU C Library is free software; you can redistribute it and/or
    5. 

  5.    modify it under the terms of the GNU Lesser General Public
    6. 

  6.    License as published by the Free Software Foundation; either
    7. 

  7.    version 2.1 of the License, or (at your option) any later version.
    8. 

  8. 

  9.    The GNU C Library is distributed in the hope that it will be useful,
    10. 

  10.    but WITHOUT ANY WARRANTY; without even the implied warranty of
    11. 

  11.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    12. 

  12.    Lesser General Public License for more details.
    13. 

  13. 

  14.    You should have received a copy of the GNU Lesser General Public
    15. 

  15.    License along with the GNU C Library; if not, see
    16. 

  16.    <http://www.gnu.org/licenses/>.  */
    17. 

  17. 

  18. #ifndef _SYS_POLL_H
    19. 

  19. # error "Never use <bits/poll.h> directly; include <sys/poll.h> instead."
    20. 

  20. #endif
    21. 

  21. 

  22. /* Event types that can be polled for.  These bits may be set in `events'
    23. 

  23.    to indicate the interesting event types; they will appear in `revents'
    24. 

  24.    to indicate the status of the file descriptor.  */
    25. 

  25. #define POLLIN		0x001		/* There is data to read.  */
    26. 

  26. #define POLLPRI		0x002		/* There is urgent data to read.  */
    27. 

  27. #define POLLOUT		0x004		/* Writing now will not block.  */
    28. 

  28. 

  29. #ifdef __USE_XOPEN
    30. 

  30. /* These values are defined in XPG4.2.  */
    31. 

  31. # define POLLRDNORM	0x040		/* Normal data may be read.  */
    32. 

  32. # define POLLRDBAND	0x080		/* Priority data may be read.  */
    33. 

  33. # define POLLWRNORM	0x100		/* Writing now will not block.  */
    34. 

  34. # define POLLWRBAND	0x200		/* Priority data may be written.  */
    35. 

  35. #endif
    36. 

  36. 

  37. #ifdef __USE_GNU
    38. 

  38. /* These are extensions for Linux.  */
    39. 

  39. # define POLLMSG	0x400
    40. 

  40. # define POLLREMOVE	0x1000
    41. 

  41. # define POLLRDHUP	0x2000
    42. 

  42. #endif
    43. 

  43. 

  44. /* Event types always implicitly polled for.  These bits need not be set in
    45. 

  45.    `events', but they will appear in `revents' to indicate the status of
    46. 

  46.    the file descriptor.  */
    47. 

  47. #define POLLERR		0x008		/* Error condition.  */
    48. 

  48. #define POLLHUP		0x010		/* Hung up.  */
    49. 

  49. #define POLLNVAL	0x020		/* Invalid polling request.  */
    50.