timer_gettime.c 2.5 KB

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  1. /* Copyright (C) 2003 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
  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 License as
  6. published by the Free Software Foundation; either version 2.1 of the
  7. 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; see the file COPYING.LIB. If
  14. not, see <http://www.gnu.org/licenses/>. */
  15. #include <errno.h>
  16. #include <stdlib.h>
  17. #include <time.h>
  18. #include <sysdep.h>
  19. #include <bits/kernel-features.h>
  20. #include "kernel-posix-timers.h"
  21. #if defined(__NR_timer_gettime) || defined(__NR_timer_gettime64)
  22. # ifndef __ASSUME_POSIX_TIMERS
  23. static int compat_timer_gettime (timer_t timerid, struct itimerspec *value);
  24. # define timer_gettime static compat_timer_gettime
  25. # include <nptl/sysdeps/pthread/timer_gettime.c>
  26. # undef timer_gettime
  27. # endif
  28. # ifdef timer_gettime_alias
  29. # define timer_gettime timer_gettime_alias
  30. # endif
  31. int
  32. timer_gettime (
  33. timer_t timerid,
  34. struct itimerspec *value)
  35. {
  36. # undef timer_gettime
  37. # ifndef __ASSUME_POSIX_TIMERS
  38. if (__no_posix_timers >= 0)
  39. # endif
  40. {
  41. struct timer *kt = (struct timer *) timerid;
  42. /* Delete the kernel timer object. */
  43. # if defined(__UCLIBC_USE_TIME64__) && defined(__NR_timer_gettime64)
  44. int res = INLINE_SYSCALL (timer_gettime64, 2, kt->ktimerid, value);
  45. # else
  46. int res = INLINE_SYSCALL (timer_gettime, 2, kt->ktimerid, value);
  47. # endif
  48. # ifndef __ASSUME_POSIX_TIMERS
  49. if (res != -1 || errno != ENOSYS)
  50. {
  51. /* We know the syscall support is available. */
  52. __no_posix_timers = 1;
  53. # endif
  54. return res;
  55. # ifndef __ASSUME_POSIX_TIMERS
  56. }
  57. # endif
  58. # ifndef __ASSUME_POSIX_TIMERS
  59. __no_posix_timers = -1;
  60. # endif
  61. }
  62. # ifndef __ASSUME_POSIX_TIMERS
  63. return compat_timer_gettime (timerid, value);
  64. # endif
  65. }
  66. #else
  67. # ifdef timer_gettime_alias
  68. # define timer_gettime timer_gettime_alias
  69. # endif
  70. /* The new system calls are not available. Use the userlevel
  71. implementation. */
  72. # include <nptl/sysdeps/pthread/timer_gettime.c>
  73. #endif