1 | /* Copyright (C) 1999-2016 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
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 |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
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 |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <time.h> |
20 | #include <sys/time.h> |
21 | #include <libc-internal.h> |
22 | #include <ldsodefs.h> |
23 | |
24 | |
25 | #if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME |
26 | /* Clock frequency of the processor. We make it a 64-bit variable |
27 | because some jokers are already playing with processors with more |
28 | than 4GHz. */ |
29 | static hp_timing_t freq; |
30 | |
31 | |
32 | /* This function is defined in the thread library. */ |
33 | extern void __pthread_clock_settime (clockid_t clock_id, hp_timing_t offset) |
34 | __attribute__ ((__weak__)); |
35 | |
36 | |
37 | static int |
38 | hp_timing_settime (clockid_t clock_id, const struct timespec *tp) |
39 | { |
40 | hp_timing_t tsc; |
41 | hp_timing_t usertime; |
42 | |
43 | /* First thing is to get the current time. */ |
44 | HP_TIMING_NOW (tsc); |
45 | |
46 | if (__glibc_unlikely (freq == 0)) |
47 | { |
48 | /* This can only happen if we haven't initialized the `freq' |
49 | variable yet. Do this now. We don't have to protect this |
50 | code against multiple execution since all of them should lead |
51 | to the same result. */ |
52 | freq = __get_clockfreq (); |
53 | if (__glibc_unlikely (freq == 0)) |
54 | /* Something went wrong. */ |
55 | return -1; |
56 | } |
57 | |
58 | /* Convert the user-provided time into CPU ticks. */ |
59 | usertime = tp->tv_sec * freq + (tp->tv_nsec * freq) / 1000000000ull; |
60 | |
61 | /* Determine the offset and use it as the new base value. */ |
62 | if (clock_id == CLOCK_PROCESS_CPUTIME_ID |
63 | || __pthread_clock_settime == NULL) |
64 | GL(dl_cpuclock_offset) = tsc - usertime; |
65 | else |
66 | __pthread_clock_settime (clock_id, tsc - usertime); |
67 | |
68 | return 0; |
69 | } |
70 | #endif |
71 | |
72 | |
73 | /* Set CLOCK to value TP. */ |
74 | int |
75 | __clock_settime (clockid_t clock_id, const struct timespec *tp) |
76 | { |
77 | int retval; |
78 | |
79 | /* Make sure the time cvalue is OK. */ |
80 | if (tp->tv_nsec < 0 || tp->tv_nsec >= 1000000000) |
81 | { |
82 | __set_errno (EINVAL); |
83 | return -1; |
84 | } |
85 | |
86 | switch (clock_id) |
87 | { |
88 | #define HANDLE_REALTIME \ |
89 | do { \ |
90 | struct timeval tv; \ |
91 | TIMESPEC_TO_TIMEVAL (&tv, tp); \ |
92 | \ |
93 | retval = settimeofday (&tv, NULL); \ |
94 | } while (0) |
95 | |
96 | #ifdef SYSDEP_SETTIME |
97 | SYSDEP_SETTIME; |
98 | #endif |
99 | |
100 | #ifndef HANDLED_REALTIME |
101 | case CLOCK_REALTIME: |
102 | HANDLE_REALTIME; |
103 | break; |
104 | #endif |
105 | |
106 | default: |
107 | #ifdef SYSDEP_SETTIME_CPU |
108 | SYSDEP_SETTIME_CPU; |
109 | #endif |
110 | #ifndef HANDLED_CPUTIME |
111 | # if HP_TIMING_AVAIL |
112 | if (CPUCLOCK_WHICH (clock_id) == CLOCK_PROCESS_CPUTIME_ID |
113 | || CPUCLOCK_WHICH (clock_id) == CLOCK_THREAD_CPUTIME_ID) |
114 | retval = hp_timing_settime (clock_id, tp); |
115 | else |
116 | # endif |
117 | { |
118 | __set_errno (EINVAL); |
119 | retval = -1; |
120 | } |
121 | #endif |
122 | break; |
123 | } |
124 | |
125 | return retval; |
126 | } |
127 | weak_alias (__clock_settime, clock_settime) |
128 | |