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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) |