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688903eb | 1 | /* Copyright (C) 1994-2018 Free Software Foundation, Inc. |
ebbad4cc | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
ebbad4cc | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
ebbad4cc UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <stddef.h> |
19 | #include <errno.h> | |
20 | #include <sys/time.h> | |
21 | #include <hurd.h> | |
22 | ||
23 | /* XXX Temporary cheezoid implementation; see __setitmr.c. */ | |
24 | ||
25 | /* These are defined in __setitmr.c. */ | |
26 | extern spin_lock_t _hurd_itimer_lock; | |
27 | extern struct itimerval _hurd_itimerval; | |
28 | extern struct timeval _hurd_itimer_started; | |
29 | ||
30 | static inline void | |
31 | subtract_timeval (struct timeval *from, const struct timeval *subtract) | |
32 | { | |
33 | from->tv_usec -= subtract->tv_usec; | |
34 | from->tv_sec -= subtract->tv_sec; | |
35 | while (from->tv_usec < 0) | |
36 | { | |
37 | --from->tv_sec; | |
38 | from->tv_usec += 1000000; | |
39 | } | |
40 | } | |
41 | ||
42 | /* Set *VALUE to the current setting of timer WHICH. | |
43 | Return 0 on success, -1 on errors. */ | |
44 | int | |
bd2260a2 | 45 | __getitimer (enum __itimer_which which, struct itimerval *value) |
28f540f4 RM |
46 | { |
47 | struct itimerval val; | |
48 | struct timeval elapsed; | |
49 | ||
50 | switch (which) | |
51 | { | |
52 | default: | |
53 | return __hurd_fail (EINVAL); | |
54 | ||
55 | case ITIMER_VIRTUAL: | |
56 | case ITIMER_PROF: | |
57 | return __hurd_fail (ENOSYS); | |
58 | ||
59 | case ITIMER_REAL: | |
60 | break; | |
61 | } | |
62 | ||
63 | /* Get the time now. */ | |
64 | if (__gettimeofday (&elapsed, NULL) < 0) | |
65 | return -1; | |
66 | ||
67 | /* Extract the current timer setting; and the time it was set, so we can | |
68 | calculate the time elapsed so far. */ | |
69 | HURD_CRITICAL_BEGIN; | |
70 | __spin_lock (&_hurd_itimer_lock); | |
71 | val = _hurd_itimerval; | |
72 | subtract_timeval (&elapsed, &_hurd_itimer_started); | |
73 | __spin_unlock (&_hurd_itimer_lock); | |
74 | HURD_CRITICAL_END; | |
75 | ||
76 | if ((val.it_value.tv_sec | val.it_value.tv_usec) != 0) | |
77 | { | |
78 | /* There is a pending alarm set. VAL indicates the interval it was | |
79 | set for, relative to the time recorded in _hurd_itimer_started. | |
80 | Now compensate for the time elapsed since to get the user's | |
81 | conception of the current value of the timer (as if the value | |
82 | stored decreased every microsecond). */ | |
83 | if (timercmp (&val.it_value, &elapsed, <)) | |
84 | { | |
85 | /* Hmm. The timer should have just gone off, but has not been | |
86 | reset. This is a possible timing glitch. The alarm will signal | |
87 | soon, so fabricate a value for how soon. */ | |
88 | val.it_value.tv_sec = 0; | |
89 | val.it_value.tv_usec = 10; /* Random. */ | |
90 | } | |
91 | else | |
92 | /* Subtract the time elapsed since the timer was set | |
93 | from the current timer value the user sees. */ | |
94 | subtract_timeval (&val.it_value, &elapsed); | |
95 | } | |
96 | ||
97 | *value = val; | |
98 | return 0; | |
99 | } | |
100 | ||
101 | weak_alias (__getitimer, getitimer) |