projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| c000cdad | 1 | /* High-resolution sleep with the specified clock. |
| 04277e02 | 2 | Copyright (C) 2000-2019 Free Software Foundation, Inc. |
| c000cdad UD |
3 | This file is part of the GNU C Library. |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| c000cdad UD |
9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 13 | Lesser General Public License for more details. |
| c000cdad | 14 | |
| 41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| c000cdad UD |
18 | |
| 19 | #include <assert.h> | |
| 20 | #include <errno.h> | |
| 8be918b7 | 21 | #include <time.h> |
| 7a114794 | 22 | #include <sysdep-cancel.h> |
| c000cdad | 23 | |
| c000cdad UD |
24 | /* This implementation assumes that these is only a `nanosleep' system |
| 25 | call. So we have to remap all other activities. */ | |
| 26 | int | |
| 89fb6835 SP |
27 | __clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req, |
| 28 | struct timespec *rem) | |
| c000cdad UD |
29 | { |
| 30 | struct timespec now; | |
| 31 | ||
| 32 | if (__builtin_expect (req->tv_nsec, 0) < 0 | |
| 33 | || __builtin_expect (req->tv_nsec, 0) >= 1000000000) | |
| 34 | return EINVAL; | |
| 35 | ||
| 60fce589 RM |
36 | if (clock_id == CLOCK_THREAD_CPUTIME_ID) |
| 37 | return EINVAL; /* POSIX specifies EINVAL for this case. */ | |
| 38 | ||
| 38cc11da | 39 | if (clock_id < CLOCK_REALTIME || clock_id > CLOCK_THREAD_CPUTIME_ID) |
| ad0e8eb0 UD |
40 | return EINVAL; |
| 41 | ||
| c000cdad UD |
42 | /* If we got an absolute time, remap it. */ |
| 43 | if (flags == TIMER_ABSTIME) | |
| 44 | { | |
| 45 | long int nsec; | |
| 46 | long int sec; | |
| 47 | ||
| 48 | /* Make sure we use safe data types. */ | |
| 49 | assert (sizeof (sec) >= sizeof (now.tv_sec)); | |
| 50 | ||
| 51 | /* Get the current time for this clock. */ | |
| 38cc11da | 52 | if (__clock_gettime (clock_id, &now) != 0) |
| c000cdad UD |
53 | return errno; |
| 54 | ||
| 55 | /* Compute the difference. */ | |
| 56 | nsec = req->tv_nsec - now.tv_nsec; | |
| 57 | sec = req->tv_sec - now.tv_sec - (nsec < 0); | |
| 58 | if (sec < 0) | |
| 59 | /* The time has already elapsed. */ | |
| 60 | return 0; | |
| 61 | ||
| 62 | now.tv_sec = sec; | |
| 63 | now.tv_nsec = nsec + (nsec < 0 ? 1000000000 : 0); | |
| 64 | ||
| 65 | /* From now on this is our time. */ | |
| 66 | req = &now; | |
| 67 | ||
| 68 | /* Make sure we are not modifying the struct pointed to by REM. */ | |
| 69 | rem = NULL; | |
| 70 | } | |
| 38cc11da | 71 | else if (flags != 0) |
| c000cdad UD |
72 | return EINVAL; |
| 73 | else if (clock_id != CLOCK_REALTIME) | |
| ad0e8eb0 UD |
74 | /* Not supported. */ |
| 75 | return ENOTSUP; | |
| c000cdad | 76 | |
| 38cc11da | 77 | return __nanosleep (req, rem), 0 ? errno : 0; |
| c000cdad | 78 | } |
| 89fb6835 | 79 | weak_alias (__clock_nanosleep, clock_nanosleep) |