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2f4f3bd4 RM |
1 | /* clock_gettime -- Get current time from a POSIX clockid_t. Linux version. |
2 | Copyright (C) 2003, 2004 Free Software Foundation, Inc. | |
ad0e8eb0 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 | |
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. | |
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 | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #include <sysdep.h> | |
2f4f3bd4 RM |
21 | #include <errno.h> |
22 | #include "kernel-posix-cpu-timers.h" | |
a334319f | 23 | #include "kernel-features.h" |
ad0e8eb0 UD |
24 | |
25 | ||
2f4f3bd4 RM |
26 | #define SYSCALL_GETTIME \ |
27 | retval = INLINE_SYSCALL (clock_gettime, 2, clock_id, tp); \ | |
28 | break | |
29 | ||
ad0e8eb0 | 30 | #ifdef __ASSUME_POSIX_TIMERS |
2f4f3bd4 | 31 | |
ad0e8eb0 UD |
32 | /* This means the REALTIME and MONOTONIC clock are definitely |
33 | supported in the kernel. */ | |
2f4f3bd4 RM |
34 | # define SYSDEP_GETTIME \ |
35 | SYSDEP_GETTIME_CPUTIME \ | |
ad0e8eb0 UD |
36 | case CLOCK_REALTIME: \ |
37 | case CLOCK_MONOTONIC: \ | |
2f4f3bd4 RM |
38 | SYSCALL_GETTIME |
39 | ||
40 | # define __libc_missing_posix_timers 0 | |
ad0e8eb0 UD |
41 | #elif defined __NR_clock_gettime |
42 | /* Is the syscall known to exist? */ | |
43 | int __libc_missing_posix_timers attribute_hidden; | |
44 | ||
2f4f3bd4 RM |
45 | static inline int |
46 | maybe_syscall_gettime (clockid_t clock_id, struct timespec *tp) | |
47 | { | |
48 | int e = EINVAL; | |
49 | ||
50 | if (!__libc_missing_posix_timers) | |
51 | { | |
52 | INTERNAL_SYSCALL_DECL (err); | |
53 | int r = INTERNAL_SYSCALL (clock_gettime, err, 2, clock_id, tp); | |
54 | if (!INTERNAL_SYSCALL_ERROR_P (r, err)) | |
55 | return 0; | |
56 | ||
57 | e = INTERNAL_SYSCALL_ERRNO (r, err); | |
58 | if (e == ENOSYS) | |
59 | { | |
60 | __libc_missing_posix_timers = 1; | |
61 | e = EINVAL; | |
62 | } | |
63 | } | |
64 | ||
65 | return e; | |
66 | } | |
67 | ||
ad0e8eb0 UD |
68 | /* The REALTIME and MONOTONIC clock might be available. Try the |
69 | syscall first. */ | |
2f4f3bd4 RM |
70 | # define SYSDEP_GETTIME \ |
71 | SYSDEP_GETTIME_CPUTIME \ | |
ad0e8eb0 UD |
72 | case CLOCK_REALTIME: \ |
73 | case CLOCK_MONOTONIC: \ | |
2f4f3bd4 RM |
74 | retval = maybe_syscall_gettime (clock_id, tp); \ |
75 | if (retval == 0) \ | |
76 | break; \ | |
77 | /* Fallback code. */ \ | |
78 | if (retval == EINVAL && clock_id == CLOCK_REALTIME) \ | |
79 | retval = realtime_gettime (tp); \ | |
80 | else \ | |
81 | { \ | |
82 | __set_errno (retval); \ | |
83 | retval = -1; \ | |
84 | } \ | |
85 | break; | |
ad0e8eb0 UD |
86 | #endif |
87 | ||
88 | #ifdef __NR_clock_gettime | |
89 | /* We handled the REALTIME clock here. */ | |
90 | # define HANDLED_REALTIME 1 | |
2f4f3bd4 RM |
91 | # define HANDLED_CPUTIME 1 |
92 | ||
93 | # if __ASSUME_POSIX_CPU_TIMERS > 0 | |
94 | ||
95 | # define SYSDEP_GETTIME_CPU SYSCALL_GETTIME | |
96 | # define SYSDEP_GETTIME_CPUTIME /* Default catches them too. */ | |
97 | ||
98 | # else | |
99 | ||
100 | int __libc_missing_posix_cpu_timers attribute_hidden; | |
101 | ||
102 | static int | |
103 | maybe_syscall_gettime_cpu (clockid_t clock_id, struct timespec *tp) | |
104 | { | |
105 | int e = EINVAL; | |
106 | ||
107 | if (!__libc_missing_posix_cpu_timers) | |
108 | { | |
109 | INTERNAL_SYSCALL_DECL (err); | |
110 | int r = INTERNAL_SYSCALL (clock_gettime, err, 2, clock_id, tp); | |
111 | if (!INTERNAL_SYSCALL_ERROR_P (r, err)) | |
112 | return 0; | |
113 | ||
114 | e = INTERNAL_SYSCALL_ERRNO (r, err); | |
115 | # ifndef __ASSUME_POSIX_TIMERS | |
116 | if (e == ENOSYS) | |
117 | { | |
118 | __libc_missing_posix_timers = 1; | |
119 | __libc_missing_posix_cpu_timers = 1; | |
120 | e = EINVAL; | |
121 | } | |
122 | else | |
123 | # endif | |
124 | { | |
125 | if (e == EINVAL) | |
126 | { | |
127 | /* Check whether the kernel supports CPU clocks at all. | |
128 | If not, record it for the future. */ | |
129 | r = INTERNAL_SYSCALL (clock_getres, err, 2, | |
130 | MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED), | |
131 | NULL); | |
132 | if (INTERNAL_SYSCALL_ERROR_P (r, err)) | |
133 | __libc_missing_posix_cpu_timers = 1; | |
134 | } | |
135 | } | |
136 | } | |
137 | ||
138 | return e; | |
139 | } | |
140 | ||
141 | # define SYSDEP_GETTIME_CPU \ | |
142 | retval = maybe_syscall_gettime_cpu (clock_id, tp); \ | |
143 | if (retval == 0) \ | |
144 | break; \ | |
145 | if (retval != EINVAL || !__libc_missing_posix_cpu_timers) \ | |
146 | { \ | |
147 | __set_errno (retval); \ | |
148 | retval = -1; \ | |
149 | break; \ | |
150 | } \ | |
151 | retval = -1 /* Otherwise continue on to the HP_TIMING version. */; | |
152 | ||
153 | static inline int | |
154 | maybe_syscall_gettime_cputime (clockid_t clock_id, struct timespec *tp) | |
155 | { | |
156 | return maybe_syscall_gettime_cpu | |
157 | (clock_id == CLOCK_THREAD_CPUTIME_ID | |
158 | ? MAKE_THREAD_CPUCLOCK (0, CPUCLOCK_SCHED) | |
159 | : MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED), | |
160 | tp); | |
161 | } | |
162 | ||
163 | # define SYSDEP_GETTIME_CPUTIME \ | |
164 | case CLOCK_PROCESS_CPUTIME_ID: \ | |
165 | case CLOCK_THREAD_CPUTIME_ID: \ | |
166 | retval = maybe_syscall_gettime_cputime (clock_id, tp); \ | |
167 | if (retval == 0) \ | |
168 | break; \ | |
169 | if (retval != EINVAL || !__libc_missing_posix_cpu_timers) \ | |
170 | { \ | |
171 | __set_errno (retval); \ | |
172 | retval = -1; \ | |
173 | break; \ | |
174 | } \ | |
175 | retval = hp_timing_gettime (clock_id, tp); \ | |
176 | break; | |
177 | # if !HP_TIMING_AVAIL | |
178 | # define hp_timing_gettime(clock_id, tp) (__set_errno (EINVAL), -1) | |
179 | # endif | |
180 | ||
181 | # endif | |
ad0e8eb0 UD |
182 | #endif |
183 | ||
184 | #include <sysdeps/unix/clock_gettime.c> |